{"generated":1793533177,"trend_freqs_hz":[1.0,10.0,100.0,1000.0,10000.0],"runs":[{"file_id":17,"path":"3-3.5cmishover_eis.csv","filename":"3-3.5cmishover_eis.csv","mtime":1793200000.0,"saved_at":"2026-10-28 09:11","kind":"eis","board":"picoadc","n_points":499,"f_lo_hz":0.150158,"f_hi_hz":100342.0,"fs_hz":250000.0,"r_shunt_ohm":5000.0,"shunts":"5000","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":451.058,"median_phase_raw_deg":7.12413,"frac_open":0.0,"temp_c":20.75,"medium_tag":"","notes_tag":"","category":"soil","condition":"3-3.5cm ish over","summary":"Soil at about 3-3.5 cm 'over' (from the filename; the exact meaning is unclear), measured with a Wenner 4-rod array on the experimental picoadc board with a 5000 ohm shunt. Raw |Z| goes from 233.0 ohm at the low end to 505.2 ohm at the high end (median 451.1), slightly above the 2-2.5 cm run. Phase is positive, 2.631 to 34.0 deg with a median of 7.124 deg, consistent with the rest of the session on this board. There are no unresolved points. It is the last step of the centimetre series in the 2026-10-28 picoadc session. Fair trust in the category.","exclude_reason":null,"confidence":0.65,"zat":[[267.335,7.147],[322.353,9.78],[422.816,6.898],[471.533,3.022],[478.018,4.204]],"z1k":471.533,"spark":[2.367,2.376,2.406,2.419,2.427,2.455,2.476,2.505,2.536,2.568,2.597,2.623,2.641,2.654,2.665,2.672,2.677,2.679,2.683,2.679,2.675,2.679,2.695,2.703],"stats":{"zmax":507.532,"zmin":232.997,"ph_min":2.63065,"f_ph_min":1942.15,"f_peak":1942.15,"zi_peak":-21.8242,"r_lo":229.683,"r_hi":418.823}},{"file_id":9,"path":"2-2.5ishcm_eis.csv","filename":"2-2.5ishcm_eis.csv","mtime":1793200000.0,"saved_at":"2026-10-28 09:01","kind":"eis","board":"picoadc","n_points":500,"f_lo_hz":0.0999756,"f_hi_hz":100304.0,"fs_hz":250000.0,"r_shunt_ohm":5000.0,"shunts":"5000","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":420.629,"median_phase_raw_deg":6.15667,"frac_open":0.0,"temp_c":20.812,"medium_tag":"","notes_tag":"","category":"soil","condition":"2-2.5ish cm","summary":"Soil at about 2-2.5 cm (from the filename; depth or water level is not stated), measured with a Wenner 4-rod array on the experimental picoadc board with a 5000 ohm shunt. Raw |Z| goes from 225.7 ohm at the low end to 474.6 ohm at the high end (median 420.6), lower than run '1' just before it. Phase is positive, 1.413 to 32.48 deg with a median of 6.157 deg, which fits this board's sign pattern. There are no unresolved points over 500 points. It is the middle step of what looks like a centimetre series after '1_eis' and before '3-3.5cmishover'. Fair trust in the category; what the cm measures is unclear.","exclude_reason":null,"confidence":0.65,"zat":[[255.259,3.44],[288.885,9.446],[387.896,8.048],[445.713,3.744],[461.146,4.019]],"z1k":445.713,"spark":[2.354,2.381,2.389,2.404,2.403,2.416,2.423,2.44,2.473,2.51,2.546,2.578,2.6,2.62,2.635,2.645,2.654,2.66,2.668,2.674,2.668,2.659,2.676,2.676],"stats":{"zmax":485.152,"zmin":225.703,"ph_min":1.41283,"f_ph_min":4014.6,"f_peak":4014.6,"zi_peak":-11.4313,"r_lo":224.232,"r_hi":400.407}},{"file_id":8,"path":"1_eis.csv","filename":"1_eis.csv","mtime":1793200000.0,"saved_at":"2026-10-28 08:50","kind":"eis","board":"picoadc","n_points":500,"f_lo_hz":0.0999756,"f_hi_hz":100322.0,"fs_hz":250000.0,"r_shunt_ohm":5000.0,"shunts":"5000","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":548.747,"median_phase_raw_deg":2.13279,"frac_open":0.0,"temp_c":20.812,"medium_tag":"","notes_tag":"","category":"soil","condition":"possibly 1 cm step of a depth/level series (unconfirmed)","summary":"Probably soil, measured with a Wenner 4-rod array on the experimental picoadc board with a 5000 ohm shunt. The filename is a bare run index, so the category is inferred from the session. Raw |Z| goes from 393.3 to 576.5 ohm (median 548.7), the highest of the session, and the phase is mostly small and positive (median 2.133 deg, max 29.06 deg). There are no unresolved points over 500 points down to 0.09998 Hz. It comes right after the base-soil run and before '2-2.5ishcm' and '3-3.5cmishover', so it may be a 1 cm step of a series, but that is a guess. Moderate-to-low trust.","exclude_reason":null,"confidence":0.45,"zat":[[466.649,5.041],[513.264,2.504],[537.83,1.879],[558.282,1.209],[558.026,3.517]],"z1k":558.282,"spark":[2.595,2.623,2.64,2.657,2.669,2.687,2.699,2.706,2.712,2.717,2.722,2.727,2.733,2.737,2.743,2.746,2.749,2.75,2.748,2.749,2.749,2.759,2.748,2.761],"stats":{"zmax":584.275,"zmin":393.293,"ph_min":1.03445,"f_ph_min":1165.22,"f_peak":1165.22,"zi_peak":-10.0846,"r_lo":389.413,"r_hi":507.582}},{"file_id":26,"path":"basesoil_eis.csv","filename":"basesoil_eis.csv","mtime":1793190000.0,"saved_at":"2026-10-28 08:37","kind":"eis","board":"picoadc","n_points":122,"f_lo_hz":0.125115,"f_hi_hz":99908.5,"fs_hz":250000.0,"r_shunt_ohm":5000.0,"shunts":"5000","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":435.088,"median_phase_raw_deg":4.72726,"frac_open":0.0,"temp_c":20.937,"medium_tag":"","notes_tag":"","category":"soil","condition":"base soil","summary":"Base (reference) soil measured with a Wenner 4-rod array on the experimental picoadc board with a 5000 ohm shunt, sweeping down to 0.1251 Hz. Raw |Z| goes from 279.6 ohm at the low end to 439.3 ohm at the high end, and the median of 435.1 ohm shows the response is flat over most of the band. Phase is small and positive (median 4.727 deg, range 0.1521 to 46.34 deg), the same positive-sign pattern seen across this board's session. There are no unresolved points. It looks like the baseline before the run-index and centimetre-labelled runs that follow. A reasonable soil reference.","exclude_reason":null,"confidence":0.8,"zat":[[330.096,8.698],[397.967,4.714],[432.386,3.243],[460.316,1.885],[474.931,5.262]],"z1k":460.316,"spark":[2.447,2.455,2.477,2.505,2.535,2.559,2.577,2.593,2.605,2.613,2.623,2.632,2.643,2.651,2.658,2.662,2.666,2.67,2.661,2.673,2.667,2.675,2.692,2.643],"stats":{"zmax":510.732,"zmin":271.837,"ph_min":0.15209,"f_ph_min":4420.73,"f_peak":4420.73,"zi_peak":-1.23881,"r_lo":275.698,"r_hi":303.314}},{"file_id":214,"path":"test_eis.csv","filename":"test_eis.csv","mtime":1793190000.0,"saved_at":"2026-10-28 08:17","kind":"eis","board":"picoadc","n_points":221,"f_lo_hz":15.8688,"f_hi_hz":99615.6,"fs_hz":250000.0,"r_shunt_ohm":5000.0,"shunts":"5000","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":386.611,"median_phase_raw_deg":8.85192,"frac_open":0.0,"temp_c":21.0,"medium_tag":"resistor","notes_tag":"470ohm","category":"resistor","condition":null,"summary":"Probably a 470 ohm resistor, measured with the Wenner 4-rod setting on the experimental picoadc board with a 5000 ohm shunt. Only the GUI tags (medium 'resistor', notes '470ohm') say so; the filename is just 'test'. Raw |Z| goes from 246.1 to 457.1 ohm (median 386.6), and the phase runs from 3.524 to 44.6 deg (median 8.852 deg). That shape is hard to tell apart from the soil runs before and after it in this session. It was saved between the wet-soil and base-soil runs, and the previous file had no tags, so a stale tag is unlikely but the data does not clearly confirm a resistor. Treat the value as tentative. Not usable as a calibration standard.","exclude_reason":"Value comes only from notes_tag '470ohm'; the filename is a bare 'test'. Phase reaches 44.6 deg (median 8.852), and the raw |Z| curve (246.1 to 457.1 ohm) looks like the soil runs around it. Experimental picoadc board.","confidence":0.5,"zat":[null,null,[303.746,10.91],[381.606,6.362],[410.316,5.924]],"z1k":381.606,"spark":[2.391,2.405,2.424,2.445,2.466,2.486,2.508,2.525,2.544,2.56,2.574,2.582,2.592,2.6,2.608,2.606,2.612,2.616,2.615,2.601,2.627,2.636,2.641,2.66],"stats":{"zmax":465.443,"zmin":246.067,"ph_min":3.52447,"f_ph_min":9259.26,"f_peak":9259.26,"zi_peak":-23.724,"r_lo":243.784,"r_hi":325.768}},{"file_id":207,"path":"soilwetnothinginit_eis.csv","filename":"soilwetnothinginit_eis.csv","mtime":1793190000.0,"saved_at":"2026-10-28 08:10","kind":"eis","board":"picoadc","n_points":206,"f_lo_hz":1.97834,"f_hi_hz":100199.0,"fs_hz":250000.0,"r_shunt_ohm":5000.0,"shunts":"5000","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":382.001,"median_phase_raw_deg":12.1493,"frac_open":0.0,"temp_c":21.125,"medium_tag":"","notes_tag":"","category":"soil","condition":"wet, nothing in it","summary":"Wet soil with nothing planted in it, measured with a Wenner 4-rod array on the experimental picoadc board with a 5000 ohm shunt. Raw |Z| rises from 176.1 ohm at the low end to 540.8 ohm at the high end, with a median of 382.0 ohm. Phase is positive throughout, from 3.804 to 60.46 deg with a median of 12.15 deg. That is the opposite sign to the usual capacitive convention, which suggests a sign or polarity quirk on this board. There are no unresolved points. This is the first run of the 2026-10-28 picoadc session. The category is fairly reliable, but the absolute values on this experimental board are not.","exclude_reason":null,"confidence":0.8,"zat":[null,[211.762,14.88],[314.542,13.18],[407.9,6.774],[429.636,7.151]],"z1k":407.9,"spark":[2.246,2.27,2.303,2.31,2.345,2.384,2.42,2.454,2.488,2.52,2.547,2.571,2.59,2.608,2.619,2.629,2.636,2.633,2.638,2.648,2.667,2.653,2.695,2.733],"stats":{"zmax":555.34,"zmin":176.127,"ph_min":3.8043,"f_ph_min":3984.9,"f_peak":3984.9,"zi_peak":-27.6037,"r_lo":172.561,"r_hi":266.582}},{"file_id":28,"path":"capacitor_eis.csv","filename":"capacitor_eis.csv","mtime":1793190000.0,"saved_at":"2026-10-28 06:11","kind":"eis","board":"picoadc","n_points":100,"f_lo_hz":0.100175,"f_hi_hz":99899.3,"fs_hz":250000.0,"r_shunt_ohm":5000.0,"shunts":"5000","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":21.3635,"median_phase_raw_deg":-82.9724,"frac_open":0.06,"temp_c":21.375,"medium_tag":"","notes_tag":"","category":"capacitor","condition":null,"summary":"A capacitor of unstated value on the picoadc board with the 5000 ohm shunt, 100 points from 0.1 Hz to 99.9 kHz, saved with no calibration. Raw |Z| falls steeply from 2896 ohm at the low end to 49.91 ohm at the top, with a median of 21.36 ohm. The median phase is -82.97 deg, close to the -90 deg of an ideal capacitor. The phase range from -179.9 to 164.6 deg shows some wrapped points, and 6% of points are unresolved. It is the last run of the 2026-10-28 picoadc session. A clear capacitor record with no nominal value.","exclude_reason":null,"confidence":0.8,"zat":[[384.081,-84.01],[39.7118,-87.07],[4.17911,-82.28],[1.14313,-16.81],[32.6121,51.65]],"z1k":1.14313,"spark":[3.462,3.272,3.043,2.796,2.541,2.288,2.031,1.775,1.52,1.267,1.008,0.727,0.424,0.182,-0.025,0.134,-0.251,0.353,0.654,1.046,1.514,1.808,1.516,1.698],"stats":{"zmax":2896.24,"zmin":0.490519,"ph_min":-179.896,"f_ph_min":34069.7,"f_peak":0.100175,"zi_peak":2237.79,"r_lo":1838.62,"r_hi":-43.7336}},{"file_id":16,"path":"22_eis.csv","filename":"22_eis.csv","mtime":1793180000.0,"saved_at":"2026-10-28 03:49","kind":"eis","board":"picoadc","n_points":80,"f_lo_hz":1.00044,"f_hi_hz":100082.0,"fs_hz":250000.0,"r_shunt_ohm":5000.0,"shunts":"5000","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":23.0819,"median_phase_raw_deg":0.0973591,"frac_open":0.0,"temp_c":21.521,"medium_tag":"","notes_tag":"","category":"test","condition":null,"summary":"Run index 22, a quick test on the picoadc board with the 5000 ohm shunt, 80 points from 1 Hz to 100.1 kHz. The bare number is not treated as a value, and there is no tag. Raw |Z| is flat at 22.0 ohm at the low end and 23.64 ohm at the top (median 23.08 ohm), with a median phase of 0.10 deg. One point drops to -167.7 deg, so at least one reading is inverted or wrapped. The flat near-zero phase would fit a small resistor or conductive water, but the device cannot be identified. Low trust.","exclude_reason":null,"confidence":0.35,"zat":[null,[23.7749,0.435],[23.6763,-1.65],[23.1789,3.807],[119.362,-39.57]],"z1k":23.1789,"spark":[1.383,1.362,1.362,1.362,1.36,1.378,1.38,1.37,1.385,1.376,1.417,1.385,1.387,1.412,1.348,1.359,2.254,1.608,2.003,1.999,2.831,2.266,3.188,2.78],"stats":{"zmax":1616.15,"zmin":17.8763,"ph_min":-169.29,"f_ph_min":18839.0,"f_peak":21782.6,"zi_peak":161.625,"r_lo":24.127,"r_hi":-565.452}},{"file_id":18,"path":"3.3k_eis.csv","filename":"3.3k_eis.csv","mtime":1793180000.0,"saved_at":"2026-10-28 03:46","kind":"eis","board":"picoadc","n_points":44,"f_lo_hz":257.412,"f_hi_hz":100175.0,"fs_hz":250000.0,"r_shunt_ohm":5000.0,"shunts":"5000","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":1113.29,"median_phase_raw_deg":0.241812,"frac_open":0.977273,"temp_c":21.562,"medium_tag":"","notes_tag":"","category":"resistor","condition":null,"summary":"A 3.3 kohm resistor on the experimental picoadc board with a 5000 ohm shunt, 44 points from 257.4 Hz to 100.2 kHz. The few resolved points read 1114 ohm at the low end and 1131 ohm at the top (median 1113 ohm), with a median phase of 0.24 deg that peaks at 11.31 deg. There is no tag, but '3.3k' is a clear value. frac_open is 0.9773, so the sweep is almost entirely unresolved. Not usable as a calibration standard.","exclude_reason":"frac_open is 0.9773: almost all points were unresolved, and the sweep only starts at 257.4 Hz.","confidence":0.8,"zat":[null,null,null,[1113.46,0.162],[1153.22,-0.1436]],"z1k":1113.46,"spark":[3.047,3.046,3.047,3.047,3.046,3.047,3.046,3.049,3.048,3.046,3.045,3.048,3.047,3.023,3.057,3.03,3.044,3.046,3.048,3.162,3.046,3.035,3.06,3.053],"stats":{"zmax":1802.3,"zmin":961.868,"ph_min":-1.97009,"f_ph_min":37713.0,"f_peak":37713.0,"zi_peak":61.959,"r_lo":1113.97,"r_hi":1114.99}},{"file_id":213,"path":"test_bb_eis.csv","filename":"test_bb_eis.csv","mtime":1793180000.0,"saved_at":"2026-10-28 03:40","kind":"bb","board":"ads1256","n_points":242,"f_lo_hz":23.442,"f_hi_hz":3375.65,"fs_hz":7812.5,"r_shunt_ohm":5000.0,"shunts":"5000","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":602.075,"median_phase_raw_deg":0.433401,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"broadband prbs","category":"test","condition":null,"summary":"A broadband PRBS test on the old ads1256 board with a 5000 ohm shunt, 242 points from 23.44 Hz to 3.38 kHz, noted 'broadband prbs'. Raw |Z| is 609.4 ohm at the low end and 572.6 ohm at the top (median 602.1 ohm). The phase is near zero (median 0.43 deg, range -4.8 to 9.0 deg), which looks like a resistor, but no device is named. It sits between the picoadc water and 3.3k runs that night. A method test on ads1256 hardware, not a calibration candidate.","exclude_reason":null,"confidence":0.45,"zat":[null,null,[597.415,0.2988],[599.448,0.3738],null],"z1k":599.448,"spark":[2.785,2.779,2.774,2.777,2.792,2.786,2.789,2.775,2.808,2.778,2.779,2.728,2.777,2.772,2.778,2.773,2.776,2.775,2.772,2.784,2.789,2.785,2.789,2.758],"stats":{"zmax":656.053,"zmin":485.279,"ph_min":-4.82855,"f_ph_min":23.442,"f_peak":23.442,"zi_peak":51.295,"r_lo":607.227,"r_hi":572.557}},{"file_id":226,"path":"testwatersalty_eis.csv","filename":"testwatersalty_eis.csv","mtime":1793170000.0,"saved_at":"2026-10-28 02:48","kind":"eis","board":"picoadc","n_points":56,"f_lo_hz":2.2504,"f_hi_hz":99702.5,"fs_hz":250000.0,"r_shunt_ohm":5000.0,"shunts":"5000","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":69.7888,"median_phase_raw_deg":1.31685,"frac_open":0.0,"temp_c":21.625,"medium_tag":"","notes_tag":"","category":"water","condition":"salty","summary":"Salty water on the Wenner array, measured with the experimental picoadc board and a 5000 ohm shunt, 56 points from 2.25 Hz to 99.7 kHz. Raw |Z| is 62.77 ohm at the low end and 60.76 ohm at the top (median 69.79 ohm). The phase is near zero on average (median 1.3 deg) but noisy, ranging from -16.18 to 17.27 deg. There is no tag. It is the first picoadc run of the 2026-10-28 session. A reasonable water test on the new board.","exclude_reason":null,"confidence":0.8,"zat":[null,[62.0741,3.763],[67.3696,0.8045],[66.7528,-0.8438],[66.2182,-12.57]],"z1k":66.7528,"spark":[1.77,1.779,1.787,1.791,1.804,1.814,1.818,1.828,1.828,1.835,1.824,1.809,1.799,1.826,1.821,1.818,1.778,1.715,1.832,1.737,2.068,1.686,1.794,1.458],"stats":{"zmax":127.33,"zmin":28.688,"ph_min":-76.0101,"f_ph_min":56082.7,"f_peak":25815.8,"zi_peak":76.6166,"r_lo":58.7526,"r_hi":27.9776}},{"file_id":1,"path":"100kohmsmultitone_eis.csv","filename":"100kohmsmultitone_eis.csv","mtime":1793170000.0,"saved_at":"2026-10-28 00:36","kind":"eis","board":"ads1115","n_points":69,"f_lo_hz":16.5002,"f_hi_hz":101.1,"fs_hz":297.8,"r_shunt_ohm":2200.0,"shunts":"2200","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":2888.5,"median_phase_raw_deg":0.572973,"frac_open":0.275362,"temp_c":21.625,"medium_tag":"100kresistor","notes_tag":"","category":"resistor","condition":null,"summary":"A 100 kohm resistor on the experimental slow ads1115 board with a 2200 ohm shunt, multitone, 69 points over a narrow 16.5-101 Hz band. Raw |Z| is 2850 ohm at the low end and 2422 ohm at the top (median 2888 ohm), and the phase is resistor-like (median 0.57 deg, range -2.2 to 3.4 deg). The '100kresistor' tag agrees. However, 27.5% of points were unresolved, and there are no other ads1115 runs to check the ordering against. It meets the standard criteria and is usable as a calibration standard for this board only, but give it a careful human review.","exclude_reason":null,"confidence":0.75,"zat":[null,null,[2445.88,0.7726],null,null],"z1k":null,"spark":[4.713,4.797,4.764,4.759,4.98,4.827,4.922,4.744,4.976,5.097,5.072,4.932,4.822,4.844,4.788,4.722,4.89,4.104,3.461,3.462,3.444,3.443,3.43,3.384],"stats":{"zmax":155257.0,"zmin":2421.52,"ph_min":-56.6596,"f_ph_min":38.6998,"f_peak":60.5304,"zi_peak":122769.0,"r_lo":51618.3,"r_hi":2421.39}},{"file_id":217,"path":"testgarboignoreplease_eis.csv","filename":"testgarboignoreplease_eis.csv","mtime":1792850000.0,"saved_at":"2026-10-24 08:40","kind":"eis","board":"pcm1808","n_points":500,"f_lo_hz":0.050049,"f_hi_hz":43945.3,"fs_hz":96000.0,"r_shunt_ohm":3550.0,"shunts":"3550","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":1549.84,"median_phase_raw_deg":-11.5245,"frac_open":0.0,"temp_c":20.277,"medium_tag":"","notes_tag":"","category":"junk","condition":null,"summary":"Explicitly marked 'garbo, ignore please' by the owner. It is a 500-point pcm1808 sweep on the 3550 ohm shunt from 0.05 Hz to 43.95 kHz. Raw |Z| goes from 8129 ohm at the low end to 1067 ohm at the top (median 1550 ohm), with phase reaching -37.66 deg. That is the same RC-like signature as testsimulated and garbage from the same morning. Discard.","exclude_reason":null,"confidence":0.9,"zat":[[7709.95,-7.698],[5063.04,-30.51],[1723.97,-30.62],[1128.45,-7.754],[1073.3,-1.304]],"z1k":1128.45,"spark":[3.91,3.909,3.907,3.904,3.898,3.887,3.869,3.836,3.781,3.695,3.58,3.449,3.322,3.215,3.138,3.091,3.063,3.048,3.039,3.035,3.032,3.03,3.029,3.028],"stats":{"zmax":8129.46,"zmin":1067.47,"ph_min":-37.6579,"f_ph_min":31.7406,"f_peak":8.93996,"zi_peak":2579.2,"r_lo":8128.77,"r_hi":1067.44}},{"file_id":190,"path":"garbage_eis.csv","filename":"garbage_eis.csv","mtime":1792850000.0,"saved_at":"2026-10-24 08:22","kind":"eis","board":"pcm1808","n_points":30,"f_lo_hz":1.00015,"f_hi_hz":10101.0,"fs_hz":96000.0,"r_shunt_ohm":3550.0,"shunts":"3550","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":1733.0,"median_phase_raw_deg":-16.4629,"frac_open":0.0,"temp_c":20.993,"medium_tag":"","notes_tag":"","category":"junk","condition":null,"summary":"Marked as garbage by the owner. It is a short 30-point pcm1808 sweep on the 3550 ohm shunt from 1 Hz to 10.1 kHz, two minutes after the simulated test. Raw |Z| falls from 7710 ohm at the low end to 1073 ohm at the top (median 1733 ohm), and the phase minimum is -37.65 deg. That is the same RC-like signature as the simulated and PRBS runs. Ignore it for analysis.","exclude_reason":null,"confidence":0.85,"zat":[null,[5060.32,-30.5],[1728.43,-30.55],[1129.04,-7.79],[1073.32,-1.306]],"z1k":1129.04,"spark":[3.887,3.875,3.858,3.833,3.798,3.748,3.686,3.61,3.526,3.437,3.35,3.271,3.205,3.153,3.114,3.086,3.068,3.055,3.046,3.041,3.037,3.034,3.032,3.031],"stats":{"zmax":7709.81,"zmin":1073.24,"ph_min":-37.6537,"f_ph_min":32.627,"f_peak":9.78809,"zi_peak":2573.49,"r_lo":7640.33,"r_hi":1072.97}},{"file_id":224,"path":"testsimulated_eis.csv","filename":"testsimulated_eis.csv","mtime":1792850000.0,"saved_at":"2026-10-24 08:20","kind":"eis","board":"pcm1808","n_points":130,"f_lo_hz":0.100098,"f_hi_hz":43181.8,"fs_hz":96000.0,"r_shunt_ohm":3550.0,"shunts":"3550","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":1703.38,"median_phase_raw_deg":-10.3189,"frac_open":0.0,"temp_c":21.39,"medium_tag":"","notes_tag":"","category":"test","condition":null,"summary":"A 'simulated' test sweep logged as pcm1808 on the 3550 ohm shunt, 130 points from 0.1 Hz to 43.18 kHz, saved with no calibration. Raw |Z| goes from 8102 ohm at the low end to 1068 ohm at the top (median 1703 ohm). The phase minimum is -37.66 deg, with a median of -10.32 deg, an RC-network shape. The minimum phase and the 1068 ohm high-frequency level match the ads1256 PRBS run and the later garbage runs almost exactly. That points to simulated or replayed data rather than a fresh measurement. Not a real device record.","exclude_reason":null,"confidence":0.55,"zat":[[7709.43,-7.702],[5062.76,-30.51],[1723.94,-30.62],[1128.5,-7.756],[1073.32,-1.304]],"z1k":1128.5,"spark":[3.909,3.907,3.903,3.898,3.888,3.871,3.842,3.794,3.719,3.617,3.496,3.372,3.26,3.173,3.115,3.078,3.057,3.045,3.038,3.034,3.031,3.03,3.029,3.028],"stats":{"zmax":8102.31,"zmin":1067.51,"ph_min":-37.6573,"f_ph_min":31.3824,"f_peak":9.37866,"zi_peak":2577.47,"r_lo":8100.24,"r_hi":1067.48}},{"file_id":219,"path":"testprbs_bb_eis.csv","filename":"testprbs_bb_eis.csv","mtime":1792850000.0,"saved_at":"2026-10-24 08:15","kind":"bb","board":"ads1256","n_points":3685,"f_lo_hz":11.7202,"f_hi_hz":43188.9,"fs_hz":96000.0,"r_shunt_ohm":3550.0,"shunts":"3550","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":1069.39,"median_phase_raw_deg":-0.70708,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"broadband prbs","category":"test","condition":null,"summary":"A broadband PRBS excitation test on the ads1256 board with the 3550 ohm shunt, 3685 points from 11.72 Hz to 43.19 kHz, noted 'broadband prbs'. Raw |Z| rises from 1068 ohm at the top of the band to 4754 ohm at the low end (median 1069 ohm), and the phase dips to -37.6 deg. That fits an RC-like test load. It was taken a minute after the chirp test, which shared the same 1068 ohm high-frequency level. A method test, not a measurement of a named device.","exclude_reason":null,"confidence":0.5,"zat":[null,null,[1724.53,-30.61],[1128.45,-7.753],[1073.3,-1.302]],"z1k":1128.45,"spark":[3.677,3.605,3.532,3.453,3.375,3.302,3.237,3.183,3.14,3.108,3.085,3.068,3.057,3.048,3.043,3.038,3.035,3.033,3.032,3.031,3.03,3.029,3.029,3.028],"stats":{"zmax":4753.68,"zmin":1067.44,"ph_min":-37.5951,"f_ph_min":35.1605,"f_peak":11.7202,"zi_peak":2532.07,"r_lo":4023.2,"r_hi":1067.51}},{"file_id":215,"path":"testchirp_bb_eis.csv","filename":"testchirp_bb_eis.csv","mtime":1792850000.0,"saved_at":"2026-10-24 08:14","kind":"bb","board":"ads1256","n_points":79,"f_lo_hz":1000.0,"f_hi_hz":40000.0,"fs_hz":96000.0,"r_shunt_ohm":3550.0,"shunts":"3550","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":1069.62,"median_phase_raw_deg":-0.736063,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"broadband chirp","category":"test","condition":null,"summary":"A broadband chirp excitation test on the old ads1256 board with a 3550 ohm shunt, 79 points from 1 kHz to 40 kHz, noted 'broadband chirp'. Raw |Z| is 1128 ohm at the low end and 1068 ohm at the top (median 1070 ohm), and the phase stays between -7.753 and -0.438 deg. The device is not named. The 1068 ohm high-frequency level is the same as in the PRBS, simulated and garbage runs that followed, so they likely share one test load. It is an ads1256 method test, so it is excluded from calibration on that ground as well.","exclude_reason":null,"confidence":0.5,"zat":[null,null,null,[1128.47,-7.753],[1073.37,-1.308]],"z1k":1128.47,"spark":[3.052,3.049,3.046,3.044,3.041,3.04,3.038,3.037,3.035,3.034,3.033,3.033,3.032,3.031,3.031,3.03,3.03,3.03,3.029,3.029,3.029,3.029,3.029,3.028],"stats":{"zmax":1128.47,"zmin":1067.54,"ph_min":-7.75294,"f_ph_min":1000.0,"f_peak":1000.0,"zi_peak":152.232,"r_lo":1118.15,"r_hi":1067.51}},{"file_id":14,"path":"220kohmsswappedchannels_eis.csv","filename":"220kohmsswappedchannels_eis.csv","mtime":1792770000.0,"saved_at":"2026-10-23 10:05","kind":"eis","board":"pcm1808","n_points":20,"f_lo_hz":8.00038,"f_hi_hz":47689.7,"fs_hz":96000.0,"r_shunt_ohm":3550.0,"shunts":"3550","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":95430.1,"median_phase_raw_deg":-0.439012,"frac_open":0.0,"temp_c":22.19,"medium_tag":"220kresistor","notes_tag":"","category":"resistor","condition":null,"summary":"The same 220 kohm resistor with the load and shunt channels deliberately swapped, on the 3550 ohm shunt, 20 points, two minutes after the normal run. Raw |Z| is 96340 ohm at 8 Hz and 78820 ohm at 47.7 kHz (median 95430 ohm). The phase is near zero (median -0.44 deg) but drops to -54.9 deg at the top of the band. Its median is exactly the reciprocal of the normal run (132.1 ohm) relative to the shunt squared. It is a useful diagnostic of channel mapping, but never a calibration standard.","exclude_reason":"'swappedchannels' in the name: the load and shunt channels were deliberately swapped.","confidence":0.85,"zat":[null,[96273.0,-0.7239],[95705.6,-0.5179],[93949.8,-0.1675],[96770.2,0.005497]],"z1k":93949.8,"spark":[4.984,4.983,4.983,4.982,4.982,4.982,4.982,4.981,4.98,4.978,4.976,4.974,4.973,4.973,4.973,4.974,4.972,4.965,4.978,4.987,4.974,4.968,4.969,4.897],"stats":{"zmax":97665.5,"zmin":78818.7,"ph_min":-54.8954,"f_ph_min":47689.7,"f_peak":47689.7,"zi_peak":64481.9,"r_lo":96331.6,"r_hi":45326.3}},{"file_id":13,"path":"220kohms_eis.csv","filename":"220kohms_eis.csv","mtime":1792770000.0,"saved_at":"2026-10-23 10:03","kind":"eis","board":"pcm1808","n_points":20,"f_lo_hz":8.00039,"f_hi_hz":47702.8,"fs_hz":96000.0,"r_shunt_ohm":3550.0,"shunts":"3550","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":132.132,"median_phase_raw_deg":0.370047,"frac_open":0.0,"temp_c":22.19,"medium_tag":"220kresistor","notes_tag":"","category":"resistor","condition":null,"summary":"A 220 kohm resistor on a 3550 ohm shunt, multitone but only 20 points, saved with no calibration. Raw |Z| is 130.8 ohm at 8 Hz and 136.2 ohm at 47.7 kHz (median 132.1 ohm), with a near-zero median phase of 0.37 deg that peaks at 19.75 deg. The '220kresistor' tag agrees. Its median times the swapped-channel run's median (95430 ohm) equals the shunt squared almost exactly, so the two runs are clean reciprocals. For a 220 kohm part, the swapped reading is the more plausible one, which hints that the normal channel mapping was inverted in this setup. Not usable as a calibration standard.","exclude_reason":"The deliberate swap run two minutes later reads exactly the reciprocal (132.1 x 95430 = 3550^2), and the swapped value is the physically sensible one for 220k. That suggests the channel assignment here is inverted. Only 20 points, and the phase peaks at 19.75 deg.","confidence":0.75,"zat":[null,[131.013,0.7371],[131.761,0.5131],[134.211,0.1655],[137.883,-1.897]],"z1k":134.211,"spark":[2.117,2.118,2.118,2.118,2.119,2.118,2.119,2.12,2.121,2.123,2.124,2.127,2.128,2.128,2.128,2.124,2.119,2.123,2.124,2.142,2.133,2.081,2.038,2.134],"stats":{"zmax":141.662,"zmin":105.402,"ph_min":-4.23604,"f_ph_min":18465.6,"f_peak":18465.6,"zi_peak":9.67103,"r_lo":130.826,"r_hi":128.208}},{"file_id":4,"path":"10_eis.csv","filename":"10_eis.csv","mtime":1792760000.0,"saved_at":"2026-10-23 06:39","kind":"eis","board":"pcm1808","n_points":50,"f_lo_hz":5.0,"f_hi_hz":47936.4,"fs_hz":96000.0,"r_shunt_ohm":1000.0,"shunts":"1000","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":55.3289,"median_phase_raw_deg":4.87477,"frac_open":0.0,"temp_c":21.44,"medium_tag":"chaotic","notes_tag":"","category":"test","condition":null,"summary":"Run index 10, a quick test with no stated device. The bare number is not a value. It was taken on the Wenner fixture with the 1000 ohm shunt, multitone, 50 points from 5 Hz. Raw |Z| is 50.98 ohm at the low end and 55.13 ohm at 47.9 kHz (median 55.33 ohm). The phase jumps from -133.6 to 177.3 deg around a median of 4.9 deg, and the owner tagged it 'chaotic'. What was on the terminals cannot be told. Low trust; keep only as a record of an unstable test.","exclude_reason":null,"confidence":0.35,"zat":[null,[5.26485,20.55],[12.196,2.834],[20.8437,-7.965],[6.23132,44.48]],"z1k":20.8437,"spark":[0.751,0.493,0.882,1.149,1.115,0.959,0.971,1.089,1.058,1.09,1.044,1.061,-0.315,1.058,0.348,1.086,1.633,0.222,0.536,0.806,0.628,0.704,1.02,0.474],"stats":{"zmax":51.4143,"zmin":0.211919,"ph_min":-163.183,"f_ph_min":18809.1,"f_peak":967.326,"zi_peak":21.7728,"r_lo":0.248775,"r_hi":-1.1965}},{"file_id":186,"path":"distilledwaternosalt_eis.csv","filename":"distilledwaternosalt_eis.csv","mtime":1791940000.0,"saved_at":"2026-10-13 19:41","kind":"eis","board":"pcm1808","n_points":400,"f_lo_hz":3.99895,"f_hi_hz":47708.1,"fs_hz":96000.0,"r_shunt_ohm":1000.0,"shunts":"1000","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":31.1555,"median_phase_raw_deg":1.31712,"frac_open":0.0,"temp_c":25.69,"medium_tag":"distilledwater","notes_tag":"","category":"water","condition":"distilled, no salt","summary":"Distilled water with no salt on the Wenner array with the 1000 ohm shunt, a dense 400-point multitone sweep. The 'distilledwater' tag agrees. Raw |Z| reads only 30.67 ohm at 4 Hz and 45.99 ohm at 47.7 kHz (median 31.16 ohm), which is surprisingly low for poorly conducting water. This likely means the reading is past the front-end ceiling, as with the open-air run. The phase swings widely from -62.59 to 59.29 deg around a median of 1.3 deg, which points to an unstable, near-unresolvable signal. Trust the label, not the numbers.","exclude_reason":null,"confidence":0.75,"zat":[null,[25.2335,2.626],[24.9095,0.33],[24.445,-0.1025],[26.2892,11.43]],"z1k":24.445,"spark":[1.388,1.387,1.398,1.397,1.402,1.397,1.405,1.407,1.405,1.415,1.395,1.404,1.405,1.379,1.395,1.386,1.403,1.4,1.406,1.416,1.422,1.445,1.493,1.636],"stats":{"zmax":47.3155,"zmin":23.5408,"ph_min":-70.4628,"f_ph_min":46500.3,"f_peak":46500.3,"zi_peak":44.5913,"r_lo":24.4177,"r_hi":31.7429}},{"file_id":220,"path":"testresistance_eis.csv","filename":"testresistance_eis.csv","mtime":1791900000.0,"saved_at":"2026-10-13 09:58","kind":"eis","board":"pcm1808","n_points":100,"f_lo_hz":4.00012,"f_hi_hz":46791.7,"fs_hz":96000.0,"r_shunt_ohm":1000.0,"shunts":"1000","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":1194.03,"median_phase_raw_deg":-7.43804,"frac_open":0.0,"temp_c":23.69,"medium_tag":"","notes_tag":"","category":"resistor","condition":null,"summary":"A 'test resistance' run on the 1000 ohm shunt, multitone, 100 points, three minutes after the wateragainsalty sweep, with no value and no tag. Raw |Z| is 787.9 ohm at 4 Hz and 1019 ohm at 46.8 kHz, with a higher median of 1194 ohm, so it is not flat. The phase median of -7.438 deg (range -18.59 to 8.744 deg) is more capacitive than a clean resistor. It could have been a resistor in a poor fixture, or the probes still partly in the water. The category is a guess from the name, with no nominal value. Not usable as a calibration standard.","exclude_reason":"No value is stated in the name or a tag. The phase is not resistor-flat (median -7.438 deg, minimum -18.59 deg).","confidence":0.4,"zat":[null,[3314.24,-21.39],[4412.85,-23.61],[3156.88,-18.13],[2443.11,-27.65]],"z1k":3156.88,"spark":[3.088,3.515,3.429,3.491,3.511,3.38,3.374,3.368,3.636,3.692,3.652,3.606,3.561,3.504,3.474,3.465,3.538,3.5,3.451,3.388,3.327,3.3,3.347,3.372],"stats":{"zmax":5328.94,"zmin":1224.11,"ph_min":-52.6567,"f_ph_min":2344.36,"f_peak":2344.36,"zi_peak":3218.54,"r_lo":1207.47,"r_hi":2227.09}},{"file_id":231,"path":"wateragainsalty_eis.csv","filename":"wateragainsalty_eis.csv","mtime":1791900000.0,"saved_at":"2026-10-13 09:55","kind":"eis","board":"pcm1808","n_points":100,"f_lo_hz":4.00014,"f_hi_hz":46794.2,"fs_hz":96000.0,"r_shunt_ohm":1000.0,"shunts":"1000","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":184.995,"median_phase_raw_deg":0.309278,"frac_open":0.0,"temp_c":23.56,"medium_tag":"","notes_tag":"","category":"water","condition":"salty (again)","summary":"Salt water measured again the next morning on the Wenner array with the 1000 ohm shunt, multitone, 100 points. Raw |Z| goes from 147.3 ohm at 4 Hz to 187.9 ohm at 46.8 kHz (median 185.0 ohm), close to the saltierwater run of the night before (median 180.4 ohm). The phase is near zero (median 0.31 deg, peak 14.21 deg). There is no tag. A repeat of the salty water condition.","exclude_reason":null,"confidence":0.8,"zat":[null,[165.635,8.495],[192.812,1.329],[203.924,1.116],[216.741,-3.355]],"z1k":203.924,"spark":[2.161,2.191,2.223,2.237,2.258,2.26,2.266,2.273,2.284,2.31,2.311,2.307,2.308,2.304,2.312,2.308,2.316,2.328,2.336,2.338,2.33,2.331,2.321,2.325],"stats":{"zmax":220.062,"zmin":145.019,"ph_min":-4.45806,"f_ph_min":1693.15,"f_peak":1693.15,"zi_peak":15.8427,"r_lo":139.524,"r_hi":211.306}},{"file_id":191,"path":"openair_eis.csv","filename":"openair_eis.csv","mtime":1791870000.0,"saved_at":"2026-10-13 01:00","kind":"eis","board":"pcm1808","n_points":100,"f_lo_hz":4.00021,"f_hi_hz":46810.5,"fs_hz":96000.0,"r_shunt_ohm":1000.0,"shunts":"1000","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":11.6198,"median_phase_raw_deg":6.28702,"frac_open":0.01,"temp_c":20.81,"medium_tag":"air","notes_tag":"","category":"open","condition":null,"summary":"The probes held in open air on the Wenner array with the 1000 ohm shunt, multitone, 100 points, at the end of the salt water session. The 'air' tag agrees with the name. Oddly, raw |Z| is very low for an open circuit: 10.41 ohm at 4 Hz, 22.45 ohm at 46.8 kHz, median 11.62 ohm, and only 1% of points are flagged unresolved. The phase wanders from -21.44 to 10.73 deg. These low readings probably reflect the front end folding above its ceiling rather than a real low impedance. Fine as a record of an open condition, not as a quantitative open calibration.","exclude_reason":null,"confidence":0.7,"zat":[null,[4.06855,7.874],[4.42093,10.7],[6.28975,16.51],[10.71,19.27]],"z1k":6.28975,"spark":[0.693,0.659,0.603,0.604,0.597,0.613,0.619,0.627,0.648,0.643,0.671,0.698,0.73,0.774,0.816,1.02,0.918,0.951,0.991,1.026,1.043,1.066,1.079,1.23],"stats":{"zmax":16.9983,"zmin":3.89897,"ph_min":-28.6893,"f_ph_min":46810.5,"f_peak":46810.5,"zi_peak":8.1602,"r_lo":4.90153,"r_hi":14.9115}},{"file_id":204,"path":"saltierwater_eis.csv","filename":"saltierwater_eis.csv","mtime":1791870000.0,"saved_at":"2026-10-13 00:57","kind":"eis","board":"pcm1808","n_points":100,"f_lo_hz":4.00014,"f_hi_hz":46786.5,"fs_hz":96000.0,"r_shunt_ohm":1000.0,"shunts":"1000","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":180.39,"median_phase_raw_deg":0.493286,"frac_open":0.0,"temp_c":20.44,"medium_tag":"","notes_tag":"","category":"water","condition":"saltier","summary":"Saltier water on the Wenner array with the 1000 ohm shunt, multitone, 100 points, three minutes after the saltwater run. Raw |Z| goes from 143.9 ohm at 4 Hz to 182.0 ohm at 46.8 kHz (median 180.4 ohm), about 40 ohm below the saltwater median of 220.2 ohm. That fits the higher salt content. The phase is near zero (median 0.49 deg, peaking at 14.52 deg). There is no tag. A consistent second step of the salt series.","exclude_reason":null,"confidence":0.85,"zat":[null,[160.763,8.663],[188.425,1.471],[199.787,1.182],[210.988,-3.46]],"z1k":199.787,"spark":[2.15,2.176,2.21,2.225,2.247,2.249,2.256,2.263,2.274,2.301,2.302,2.298,2.299,2.295,2.303,2.294,2.3,2.32,2.323,2.327,2.321,2.319,2.306,2.309],"stats":{"zmax":232.042,"zmin":141.246,"ph_min":-4.74198,"f_ph_min":1693.15,"f_peak":1693.15,"zi_peak":16.2378,"r_lo":135.669,"r_hi":203.685}},{"file_id":205,"path":"saltwater_eis.csv","filename":"saltwater_eis.csv","mtime":1791870000.0,"saved_at":"2026-10-13 00:54","kind":"eis","board":"pcm1808","n_points":100,"f_lo_hz":4.00034,"f_hi_hz":46793.4,"fs_hz":96000.0,"r_shunt_ohm":1000.0,"shunts":"1000","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":220.238,"median_phase_raw_deg":0.2378,"frac_open":0.0,"temp_c":19.44,"medium_tag":"","notes_tag":"","category":"water","condition":"salty","summary":"Salt water on the Wenner array with the 1000 ohm shunt, multitone, 100 points, the first water run of the 2026-10-13 late-night session. Raw |Z| goes from 180.3 ohm at 4 Hz to 218.5 ohm at 46.8 kHz (median 220.2 ohm). The phase is near zero (median 0.24 deg, range -4.4 to 11.6 deg), which fits conductive water. There is no tag, so the name alone gives the medium. The saltierwater run three minutes later reads lower (median 180.4 ohm), which fits more salt. A good water record.","exclude_reason":null,"confidence":0.85,"zat":[null,[204.568,7.004],[236.638,0.8203],[249.515,1.031],[267.404,-3.433]],"z1k":249.515,"spark":[2.26,2.287,2.316,2.327,2.348,2.349,2.354,2.361,2.373,2.4,2.4,2.396,2.395,2.391,2.399,2.396,2.402,2.43,2.423,2.428,2.419,2.417,2.408,2.401],"stats":{"zmax":274.261,"zmin":181.977,"ph_min":-4.89885,"f_ph_min":1693.15,"f_peak":1693.15,"zi_peak":21.3022,"r_lo":177.213,"r_hi":251.647}},{"file_id":12,"path":"20kres_eis.csv","filename":"20kres_eis.csv","mtime":1791870000.0,"saved_at":"2026-10-13 00:43","kind":"eis","board":"pcm1808","n_points":100,"f_lo_hz":3.99998,"f_hi_hz":46789.4,"fs_hz":96000.0,"r_shunt_ohm":1000.0,"shunts":"1000","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":1713.61,"median_phase_raw_deg":-0.673975,"frac_open":0.01,"temp_c":23.06,"medium_tag":"","notes_tag":"","category":"resistor","condition":null,"summary":"A 20 kohm resistor ('20kres') on the 1000 ohm shunt, multitone, 100 points up to 46.8 kHz. Raw |Z| is 1732 ohm at 4 Hz and 1653 ohm at the top (median 1714 ohm). The phase is near zero (median -0.67 deg, range -5.9 to 1.9 deg) and frac_open is 0.01, so on its own it looks like a resistor. There is no medium tag. It reads below the 3300 ohm runs of 2026-10-09 (about 1920 ohm) on the same shunt, so this shunt is saturated and the ordering does not hold across days. It opens a session that moves on to salt water and open air. Not proposed as a calibration standard.","exclude_reason":"No tag to confirm the decoded '20kres'. The median of 1714 ohm on the 1000 ohm shunt is below the 3300 ohm runs (1920) and test110k (1901) on the same board and shunt, so it is at the ceiling and the order is reversed across sessions.","confidence":0.7,"zat":[null,[10547.1,-6.965],[12905.5,-13.74],[17789.5,5.794],[18758.4,4.539]],"z1k":17789.5,"spark":[4.112,4.084,4.081,4.058,4.101,4.039,4.032,4.029,4.097,4.275,4.251,4.211,4.21,4.185,4.254,4.166,4.175,4.203,4.272,4.28,4.278,4.331,4.305,4.285],"stats":{"zmax":31765.5,"zmin":1859.83,"ph_min":-43.1842,"f_ph_min":1693.15,"f_peak":1693.15,"zi_peak":9055.32,"r_lo":12841.2,"r_hi":18501.7}},{"file_id":24,"path":"60ohms_eis.csv","filename":"60ohms_eis.csv","mtime":1791860000.0,"saved_at":"2026-10-12 20:55","kind":"eis","board":"pcm1808","n_points":191,"f_lo_hz":2.99872,"f_hi_hz":30800.8,"fs_hz":96000.0,"r_shunt_ohm":1000.0,"shunts":"1000","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":14.7848,"median_phase_raw_deg":1.07462,"frac_open":0.0418848,"temp_c":24.0,"medium_tag":"resistor60","notes_tag":"","category":"resistor","condition":null,"summary":"Labelled as a 60 ohm resistor on the 1000 ohm shunt, multitone, 191 points, run twenty minutes after testwater. The 'resistor60' tag agrees. Raw |Z| is 12.98 ohm at 3 Hz and 15.24 ohm at 30.8 kHz (median 14.78 ohm), which sits correctly below the 330 ohm reading of 315.4 ohm. However, the phase swings from -14.47 to 32.97 deg and |Z| rises with frequency just like the preceding water sweep, which is not how a plain resistor behaves. 60 ohm is also not a standard part value. Not usable as a calibration standard.","exclude_reason":"Phase is not plausible for a resistor: it spans -14.47 to +32.97 deg, |Z| rises from 12.98 to 15.24 ohm like the water run before it, and frac_open is 0.042.","confidence":0.6,"zat":[null,[21.0684,-0.9718],[18.7982,2.221],[20.101,-3.059],[16.2406,15.3]],"z1k":20.101,"spark":[1.23,1.321,1.32,1.324,1.324,1.32,1.321,1.332,1.328,1.278,1.283,1.281,1.197,1.237,1.315,1.226,1.082,1.029,1.025,1.153,1.27,1.254,1.267,1.297],"stats":{"zmax":26.676,"zmin":7.81256,"ph_min":-14.2127,"f_ph_min":21902.8,"f_peak":14031.5,"zi_peak":4.76346,"r_lo":16.9794,"r_hi":19.7531}},{"file_id":225,"path":"testwater_eis.csv","filename":"testwater_eis.csv","mtime":1791860000.0,"saved_at":"2026-10-12 20:34","kind":"eis","board":"pcm1808","n_points":191,"f_lo_hz":2.99896,"f_hi_hz":30800.8,"fs_hz":96000.0,"r_shunt_ohm":1000.0,"shunts":"1000","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":58.8482,"median_phase_raw_deg":1.15171,"frac_open":0.0,"temp_c":24.0,"medium_tag":"testwater1","notes_tag":"","category":"water","condition":"test water 1","summary":"A test sweep in water on the Wenner array with the 1000 ohm shunt, multitone, 191 points, tagged 'testwater1'. Raw |Z| rises from 41.45 ohm at 3 Hz to 59.98 ohm at 30.8 kHz (median 58.85 ohm). The phase is near zero overall (median 1.15 deg) but reaches 20.98 deg, which is a bit noisy for water. The type of water is not stated. The 60ohms run twenty minutes later shows the same rising-|Z| pattern. Treat it as a rough water record.","exclude_reason":null,"confidence":0.7,"zat":[null,[64.8653,13.73],[76.5046,2.981],[76.249,2.358],[80.044,2.456]],"z1k":76.249,"spark":[1.73,1.739,1.784,1.812,1.827,1.853,1.857,1.858,1.878,1.893,1.876,1.879,1.893,1.894,1.891,1.907,1.894,1.917,1.885,1.858,1.893,1.909,1.901,1.907],"stats":{"zmax":93.6696,"zmin":52.7907,"ph_min":-1.97496,"f_ph_min":3107.47,"f_peak":3107.47,"zi_peak":2.75062,"r_lo":50.9648,"r_hi":80.6787}},{"file_id":22,"path":"5100ohms_eis.csv","filename":"5100ohms_eis.csv","mtime":1791840000.0,"saved_at":"2026-10-12 16:39","kind":"eis","board":"pcm1808","n_points":191,"f_lo_hz":2.9992,"f_hi_hz":30800.8,"fs_hz":96000.0,"r_shunt_ohm":1000.0,"shunts":"1000","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":315.903,"median_phase_raw_deg":-0.739376,"frac_open":0.0,"temp_c":23.88,"medium_tag":"5100resistor","notes_tag":"","category":"resistor","condition":null,"summary":"A 5100 ohm resistor on the 1000 ohm shunt, multitone, 191 points from 3 Hz. Raw |Z| is 331.6 ohm at the low end and 296.6 ohm at 30.8 kHz (median 315.9 ohm), and the phase is resistor-like (median -0.74 deg, minimum -3.8 deg). The '5100resistor' tag agrees. It reads below test110kohms earlier that afternoon (1901 ohm), which is the right order. However, it matches the 330 ohm reading from 2026-10-09 and is far below the 3300 ohm runs on the same shunt. Either a different part was in the fixture or the gain changed. Not usable as a calibration standard until explained.","exclude_reason":"Raw median of 315.9 ohm on the 1000 ohm shunt matches the 330 ohm run (315.4) and is far below the 3300 ohm runs (1919-1920) on the same board and shunt. It may be the wrong part or a setup change.","confidence":0.6,"zat":[null,[484.183,-0.4161],[484.674,0.1976],[467.418,1.948],[475.127,0.9672]],"z1k":467.418,"spark":[2.703,2.68,2.684,2.685,2.681,2.682,2.676,2.673,2.687,2.693,2.676,2.671,2.676,2.688,2.679,2.698,2.678,2.714,2.666,2.631,2.671,2.689,2.667,2.663],"stats":{"zmax":610.793,"zmin":392.153,"ph_min":-4.69965,"f_ph_min":29431.9,"f_peak":29431.9,"zi_peak":37.7788,"r_lo":504.391,"r_hi":458.987}},{"file_id":208,"path":"test110kohms_eis.csv","filename":"test110kohms_eis.csv","mtime":1791840000.0,"saved_at":"2026-10-12 16:01","kind":"eis","board":"pcm1808","n_points":96,"f_lo_hz":0.0996112,"f_hi_hz":27349.6,"fs_hz":96000.0,"r_shunt_ohm":1000.0,"shunts":"1000","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":1900.86,"median_phase_raw_deg":-0.716445,"frac_open":0.0,"temp_c":23.25,"medium_tag":"resistor110k","notes_tag":"","category":"resistor","condition":null,"summary":"A retest of the 110 kohm resistor on the 1000 ohm shunt, after the 270 ohm shunt attempt came back 96.5% unresolved. The sweep is unusually wide, starting at 0.0996 Hz, with 96 points. Raw |Z| is 1936 ohm at the low end and 1821 ohm at 27 kHz (median 1901 ohm), and the phase is mostly near zero (median -0.72 deg, minimum -10.81 deg). The 'resistor110k' tag agrees. The reading is about the same as the 3300 ohm runs on this shunt (about 1920 ohm), so it is at the saturation ceiling. Treat it as a check, not a calibration standard.","exclude_reason":"'test' prefix plus an unusual sweep down to 0.0996 Hz, run as a retest after 110kohms failed on the 270 ohm shunt. The median of 1901 ohm sits at the ~1.7-1.9k ceiling of the 1000 ohm shunt (3300 ohm read 1920), so it barely tells values apart.","confidence":0.75,"zat":[[1162.49,0.002226],[1151.83,0.539],[1154.23,-0.3661],[1179.72,-0.9731],[1131.05,-0.5177]],"z1k":1179.72,"spark":[3.064,3.071,3.066,3.062,3.064,3.068,3.067,3.064,3.067,3.059,3.065,3.066,3.064,3.063,3.063,3.088,3.068,3.073,3.059,3.057,3.058,3.055,3.052,3.054],"stats":{"zmax":1294.13,"zmin":1122.71,"ph_min":-4.83891,"f_ph_min":303.377,"f_peak":303.377,"zi_peak":102.451,"r_lo":1158.38,"r_hi":1131.95}},{"file_id":11,"path":"200ohms_eis.csv","filename":"200ohms_eis.csv","mtime":1791830000.0,"saved_at":"2026-10-12 14:49","kind":"eis","board":"pcm1808","n_points":143,"f_lo_hz":4.0,"f_hi_hz":30942.7,"fs_hz":96000.0,"r_shunt_ohm":270.0,"shunts":"270","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":219.88,"median_phase_raw_deg":-0.411302,"frac_open":0.0,"temp_c":23.25,"medium_tag":"resistor200","notes_tag":"","category":"resistor","condition":null,"summary":"A 200 ohm resistor on the 270 ohm shunt, multitone, 143 points, the last run of the 270 ohm session. Raw |Z| is 223.6 ohm at 4 Hz and 215.6 ohm at 31 kHz (median 219.9 ohm), with phase between -4.526 and 1.013 deg (median -0.41 deg). The 'resistor200' tag agrees. It sits correctly just above the 198 ohm run (214.2 ohm), so this shunt does separate two nearby values. Usable as a calibration standard.","exclude_reason":null,"confidence":0.9,"zat":[null,[205.492,0.005787],[205.473,-0.004239],[205.555,0.01645],[205.496,-0.1471]],"z1k":205.555,"spark":[2.313,2.313,2.313,2.313,2.313,2.312,2.313,2.313,2.313,2.313,2.312,2.313,2.313,2.313,2.313,2.312,2.321,2.314,2.309,2.319,2.313,2.313,2.311,2.313],"stats":{"zmax":209.924,"zmin":201.164,"ph_min":-2.25025,"f_ph_min":6760.32,"f_peak":6760.32,"zi_peak":8.23519,"r_lo":205.422,"r_hi":205.568}},{"file_id":5,"path":"110kohms_eis.csv","filename":"110kohms_eis.csv","mtime":1791830000.0,"saved_at":"2026-10-12 14:46","kind":"eis","board":"pcm1808","n_points":143,"f_lo_hz":4.0,"f_hi_hz":30920.3,"fs_hz":96000.0,"r_shunt_ohm":270.0,"shunts":"270","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":697.174,"median_phase_raw_deg":-0.673757,"frac_open":0.965035,"temp_c":23.5,"medium_tag":"110000resistor","notes_tag":"","category":"resistor","condition":null,"summary":"A 110 kohm resistor on the 270 ohm shunt, multitone, 143 points. The resolved points read 713.0 ohm at 4 Hz and 682.8 ohm at 31 kHz (median 697.2 ohm), just above the 20 kohm run (663.8 ohm), so it has hit the ceiling for this shunt. The phase is near zero (median -0.67 deg), but frac_open is 0.965, so almost nothing was resolved. The '110000resistor' tag agrees with the name. It was re-measured as test110kohms on the 1000 ohm shunt later that day. Not usable as a calibration standard.","exclude_reason":"frac_open is 0.965: almost every point was unresolved on the 270 ohm shunt.","confidence":0.85,"zat":[null,[714.081,-0.8881],[703.469,-0.9552],[687.119,-0.4706],[684.517,-1.553]],"z1k":687.119,"spark":[2.853,2.851,2.842,2.848,2.839,2.857,2.854,2.843,2.851,2.841,2.867,2.852,2.847,2.837,2.836,2.832,2.933,2.841,2.84,2.845,2.836,2.837,2.833,2.834],"stats":{"zmax":74056.9,"zmin":667.741,"ph_min":-74.3974,"f_ph_min":2194.91,"f_peak":2194.91,"zi_peak":71327.9,"r_lo":712.972,"r_hi":682.832}},{"file_id":7,"path":"19point8ohms_eis.csv","filename":"19point8ohms_eis.csv","mtime":1791830000.0,"saved_at":"2026-10-12 14:09","kind":"eis","board":"pcm1808","n_points":143,"f_lo_hz":4.0,"f_hi_hz":30953.4,"fs_hz":96000.0,"r_shunt_ohm":270.0,"shunts":"270","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":12.876,"median_phase_raw_deg":-0.188093,"frac_open":0.0,"temp_c":23.56,"medium_tag":"resistor19.8","notes_tag":"","category":"resistor","condition":null,"summary":"A 19.8 ohm resistor ('19point8') on the 270 ohm shunt, multitone, 143 points. Raw |Z| is 12.99 ohm at 4 Hz and 12.64 ohm at 31 kHz (median 12.88 ohm), with phase between -3.356 and 1.047 deg, which fits a small resistor. The 'resistor19.8' tag confirms the decoded value. It is the lowest reading in a session that is correctly ordered (198 ohm reads 214.2, 200 ohm 219.9). Usable as a calibration standard at the low end.","exclude_reason":null,"confidence":0.85,"zat":[null,[383.623,0.448],[386.555,0.8739],[390.928,0.05218],[388.741,1.357]],"z1k":390.928,"spark":[2.583,2.584,2.587,2.587,2.591,2.585,2.583,2.587,2.585,2.591,2.582,2.584,2.583,2.592,2.592,2.597,2.591,2.585,2.592,2.591,2.591,2.59,2.592,2.589],"stats":{"zmax":434.353,"zmin":367.23,"ph_min":-1.08177,"f_ph_min":29096.2,"f_peak":29096.2,"zi_peak":8.20031,"r_lo":382.872,"r_hi":387.76}},{"file_id":6,"path":"198ohms_eis.csv","filename":"198ohms_eis.csv","mtime":1791830000.0,"saved_at":"2026-10-12 14:06","kind":"eis","board":"pcm1808","n_points":143,"f_lo_hz":4.0,"f_hi_hz":30978.9,"fs_hz":96000.0,"r_shunt_ohm":270.0,"shunts":"270","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":214.249,"median_phase_raw_deg":-0.329567,"frac_open":0.0,"temp_c":23.5,"medium_tag":"resistor198","notes_tag":"","category":"resistor","condition":null,"summary":"A 198 ohm resistor on the 270 ohm shunt, multitone, 143 points. Raw |Z| is 217.9 ohm at 4 Hz and 210.6 ohm at 31 kHz (median 214.2 ohm). The phase stays between -4.586 and 1.024 deg (median -0.33 deg), which fits a resistor. The 'resistor198' tag agrees. Its reading sits correctly just below the 200 ohm run later in the session (219.9 ohm) and well above 19.8 ohm (12.88 ohm). Usable as a calibration standard.","exclude_reason":null,"confidence":0.9,"zat":[null,[6407.28,0.3063],[6436.45,0.528],[6475.73,0.03832],[6481.65,0.7138]],"z1k":6475.73,"spark":[3.808,3.807,3.81,3.808,3.811,3.807,3.806,3.81,3.807,3.811,3.806,3.805,3.804,3.81,3.812,3.814,3.812,3.807,3.81,3.811,3.811,3.81,3.812,3.81],"stats":{"zmax":6657.58,"zmin":6223.77,"ph_min":-0.686275,"f_ph_min":59.969,"f_peak":59.969,"zi_peak":77.2386,"r_lo":6421.33,"r_hi":6462.14}},{"file_id":10,"path":"20000ohms_eis.csv","filename":"20000ohms_eis.csv","mtime":1791830000.0,"saved_at":"2026-10-12 14:04","kind":"eis","board":"pcm1808","n_points":143,"f_lo_hz":4.0,"f_hi_hz":30919.5,"fs_hz":96000.0,"r_shunt_ohm":270.0,"shunts":"270","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":663.796,"median_phase_raw_deg":-0.587271,"frac_open":0.0,"temp_c":23.44,"medium_tag":"resistor20000","notes_tag":"","category":"resistor","condition":null,"summary":"A 20 kohm resistor on the 270 ohm shunt, multitone, 143 points, the first run of the 2026-10-12 afternoon session. Raw |Z| is 678.7 ohm at 4 Hz and 652.0 ohm at 31 kHz (median 663.8 ohm), with phase between -5.758 and 1.511 deg (median -0.59 deg), which fits a resistor. The 'resistor20000' tag agrees. In this session the order is correct: 19.8 ohm reads 12.88, 198 ohm 214.2, 200 ohm 219.9, and the 110k run 697.2. That last value shows this one is already close to the ceiling for this shunt. Usable as a calibration standard, though it sits near the saturation range.","exclude_reason":null,"confidence":0.85,"zat":[null,[20000.9,0.0008454],[19996.2,-7.878e-05],[19993.2,-0.002707],[19996.3,-0.03194]],"z1k":19993.2,"spark":[4.301,4.301,4.301,4.301,4.301,4.301,4.301,4.301,4.301,4.301,4.301,4.301,4.301,4.301,4.301,4.301,4.301,4.3,4.298,4.301,4.303,4.301,4.3,4.301],"stats":{"zmax":20910.2,"zmin":19726.8,"ph_min":-0.547055,"f_ph_min":3424.06,"f_peak":3424.06,"zi_peak":190.371,"r_lo":20000.8,"r_hi":20004.2}},{"file_id":2,"path":"1020ohms_eis.csv","filename":"1020ohms_eis.csv","mtime":1791770000.0,"saved_at":"2026-10-11 20:09","kind":"eis","board":"pcm1808","n_points":143,"f_lo_hz":4.0,"f_hi_hz":31017.4,"fs_hz":96000.0,"r_shunt_ohm":9.9,"shunts":"9.9","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":19.7019,"median_phase_raw_deg":0.01518,"frac_open":0.0,"temp_c":21.62,"medium_tag":"resistor1020","notes_tag":"","category":"resistor","condition":null,"summary":"A 1020 ohm resistor on the 9.9 ohm shunt, multitone, 143 points, the last run of the 2026-10-11 session. Raw |Z| is flat at 19.71 ohm at 4 Hz and 19.74 ohm at 31 kHz, with phase between -0.48 and 0.97 deg. The 'resistor1020' tag agrees. It reads essentially the same as the 510 ohm run before it and far below the 105 and 220 ohm runs. The 9.9 ohm shunt range clearly fails to separate these values. Not usable as a calibration standard.","exclude_reason":"Indistinguishable from the 510 ohm run (median 19.70 vs 19.68 ohm) and reversed against 105/220 ohm in the same 9.9 ohm shunt session.","confidence":0.8,"zat":[null,[510.613,-0.0007139],[510.684,0.002825],[510.812,0.0006528],[510.713,0.01596]],"z1k":510.812,"spark":[2.708,2.708,2.708,2.708,2.708,2.708,2.708,2.708,2.708,2.708,2.708,2.708,2.708,2.708,2.708,2.708,2.709,2.708,2.71,2.708,2.708,2.708,2.708,2.708],"stats":{"zmax":512.996,"zmin":508.695,"ph_min":-0.484366,"f_ph_min":1670.18,"f_peak":1670.18,"zi_peak":4.30035,"r_lo":510.733,"r_hi":510.78}},{"file_id":23,"path":"510ohms_eis.csv","filename":"510ohms_eis.csv","mtime":1791770000.0,"saved_at":"2026-10-11 20:02","kind":"eis","board":"pcm1808","n_points":143,"f_lo_hz":4.0,"f_hi_hz":31017.4,"fs_hz":96000.0,"r_shunt_ohm":9.9,"shunts":"9.9","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":19.6811,"median_phase_raw_deg":0.0161938,"frac_open":0.0,"temp_c":21.5,"medium_tag":"resistor510","notes_tag":"","category":"resistor","condition":null,"summary":"A 510 ohm resistor on the 9.9 ohm shunt, multitone, 143 points. Raw |Z| is flat at 19.69 ohm at 4 Hz and 19.72 ohm at 31 kHz, with phase between -0.12 and 0.84 deg, so the trace is resistor-like. The 'resistor510' tag agrees. In the session, though, it reads far below the 220 ohm run (243.1 ohm) and the same as the 1020 ohm run seven minutes later (19.70 ohm). On this shunt the reading does not track R. Not usable as a calibration standard.","exclude_reason":"Reversed and indistinguishable within the 9.9 ohm shunt session: 510 ohm reads a median of 19.68 ohm, the same as 1020 ohm (19.70) and far below 220 ohm (243.1).","confidence":0.8,"zat":[null,[510.104,0.001135],[510.203,0.002655],[510.244,-0.0112],[510.406,-0.0004817]],"z1k":510.244,"spark":[2.708,2.708,2.708,2.708,2.708,2.708,2.708,2.708,2.708,2.708,2.708,2.708,2.708,2.708,2.708,2.708,2.708,2.708,2.708,2.708,2.708,2.707,2.708,2.708],"stats":{"zmax":511.418,"zmin":509.117,"ph_min":-0.380185,"f_ph_min":7735.58,"f_peak":7735.58,"zi_peak":3.39014,"r_lo":510.288,"r_hi":510.222}},{"file_id":3,"path":"105ohms_eis.csv","filename":"105ohms_eis.csv","mtime":1791760000.0,"saved_at":"2026-10-11 19:24","kind":"eis","board":"pcm1808","n_points":143,"f_lo_hz":4.0,"f_hi_hz":31045.1,"fs_hz":96000.0,"r_shunt_ohm":9.9,"shunts":"9.9","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":474.818,"median_phase_raw_deg":-0.0839847,"frac_open":0.0,"temp_c":21.56,"medium_tag":"resistor105","notes_tag":"","category":"resistor","condition":null,"summary":"A 105 ohm resistor on the 9.9 ohm shunt, multitone, 143 points, from the 2026-10-11 evening session. Raw |Z| is 479.3 ohm at 4 Hz and 467.7 ohm at 31 kHz (median 474.8 ohm). The phase is mostly near zero (median -0.084 deg, minimum -6.675 deg), which fits a resistor. The 'resistor105' tag agrees. However, it reads higher than the 220 ohm run earlier in the session, and the larger resistors read lower still, so the order is reversed across the session. Not usable as a calibration standard.","exclude_reason":"Reversed order in the 9.9 ohm shunt session: 105 ohm reads a median of 474.8 ohm, higher than the 220 ohm run (243.1 ohm) and far above 510/1020/5100 ohm (about 19.7 and 10.96 ohm).","confidence":0.8,"zat":[null,[408.791,0.0001575],[410.315,-0.03076],[408.972,0.05219],[412.865,-0.7776]],"z1k":408.972,"spark":[2.613,2.613,2.614,2.613,2.612,2.611,2.613,2.613,2.612,2.612,2.612,2.613,2.613,2.613,2.612,2.614,2.614,2.625,2.616,2.614,2.616,2.61,2.607,2.608],"stats":{"zmax":425.172,"zmin":363.472,"ph_min":-5.9511,"f_ph_min":13039.0,"f_peak":13039.0,"zi_peak":37.6846,"r_lo":410.644,"r_hi":405.503}},{"file_id":21,"path":"51000hms_eis.csv","filename":"51000hms_eis.csv","mtime":1791760000.0,"saved_at":"2026-10-11 18:59","kind":"eis","board":"pcm1808","n_points":244,"f_lo_hz":4.00123,"f_hi_hz":30701.8,"fs_hz":96000.0,"r_shunt_ohm":9.9,"shunts":"9.9","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":10.9644,"median_phase_raw_deg":-0.0147263,"frac_open":0.0,"temp_c":21.56,"medium_tag":"resistor51000","notes_tag":"","category":"resistor","condition":null,"summary":"Probably a 5100 ohm resistor: '51000hms' reads as 5100 with a mistyped O, though the tag 'resistor51000' leaves 51 kohm possible. A 5100 ohm part was used later on 2026-10-12. It ran on the 9.9 ohm shunt, multitone, 244 points. Raw |Z| is flat at 10.97 ohm at 4 Hz and 10.94 ohm at 30.7 kHz, with phase between -0.87 and 0.12 deg, so the run is resistor-like. In this session, though, raw |Z| falls as nominal R rises: 220 ohm read 243.1 ohm and 105 ohm read 474.8 ohm. Low trust in the value, and not usable as a calibration standard.","exclude_reason":"'51000hms' was decoded as 5100 ohm, but the tag 'resistor51000' could be read as 51000. Also raw |Z| (median 10.96) is the lowest in a 9.9 ohm shunt session whose order is reversed (220 ohm reads 243.1).","confidence":0.6,"zat":[null,[9.92106,0.08133],[9.92462,0.02395],[9.9263,-0.02436],[9.91765,0.496]],"z1k":9.9263,"spark":[0.995,0.996,0.996,0.997,0.997,0.996,0.996,0.996,0.997,0.997,0.997,0.997,0.997,0.997,0.997,0.998,0.997,0.996,0.999,0.997,0.998,0.996,0.996,0.998],"stats":{"zmax":10.0525,"zmin":9.80661,"ph_min":-0.236663,"f_ph_min":1784.26,"f_peak":1784.26,"zi_peak":0.0411189,"r_lo":9.88052,"r_hi":9.96052}},{"file_id":15,"path":"220ohms_eis.csv","filename":"220ohms_eis.csv","mtime":1791760000.0,"saved_at":"2026-10-11 18:47","kind":"eis","board":"pcm1808","n_points":244,"f_lo_hz":4.00123,"f_hi_hz":30684.3,"fs_hz":96000.0,"r_shunt_ohm":9.9,"shunts":"9.9","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":243.111,"median_phase_raw_deg":-0.0549072,"frac_open":0.0,"temp_c":21.5,"medium_tag":"resistor220","notes_tag":"","category":"resistor","condition":null,"summary":"A 220 ohm resistor on a 9.9 ohm shunt, multitone, 244 points, the first run of the 2026-10-11 evening session. Raw |Z| is very flat at 242.8 ohm at 4 Hz and 243.0 ohm at 30.7 kHz, with phase between -1.924 and 1.386 deg, so the run on its own looks like a clean resistor. The 'resistor220' tag agrees. Across the session, though, raw |Z| falls as nominal R rises: the 105 ohm run reads 474.8 ohm and the 5100 ohm run reads 10.96 ohm. That suggests this shunt range is not working. Not usable as a calibration standard until the session is understood.","exclude_reason":"Raw |Z| order is reversed in the 9.9 ohm shunt session of 2026-10-11: 105 ohm reads 474.8, 220 ohm reads 243.1, 510 and 1020 ohm both read about 19.7, and 5100 ohm reads 10.96. The whole session is suspect.","confidence":0.8,"zat":[null,[220.413,-0.06237],[218.034,0.4364],[220.133,-0.03444],[218.997,0.1121]],"z1k":220.133,"spark":[2.34,2.342,2.341,2.343,2.343,2.342,2.346,2.337,2.349,2.343,2.343,2.343,2.343,2.343,2.343,2.344,2.342,2.342,2.345,2.339,2.342,2.342,2.34,2.345],"stats":{"zmax":233.2,"zmin":214.835,"ph_min":-1.05061,"f_ph_min":20602.3,"f_peak":20602.3,"zi_peak":3.99766,"r_lo":218.766,"r_hi":221.199}},{"file_id":25,"path":"680kohms_eis.csv","filename":"680kohms_eis.csv","mtime":1791660000.0,"saved_at":"2026-10-10 13:37","kind":"eis","board":"pcm1808","n_points":143,"f_lo_hz":4.00003,"f_hi_hz":30981.8,"fs_hz":96000.0,"r_shunt_ohm":1000.0,"shunts":"1000","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":69134.0,"median_phase_raw_deg":0.252294,"frac_open":0.0,"temp_c":23.56,"medium_tag":"RESISTOR3800","notes_tag":"","category":"resistor","condition":null,"summary":"A 680 kohm resistor on the 1000 ohm shunt, multitone, 143 points. Raw |Z| is high and fairly flat: 71900 ohm at 4 Hz and 68450 ohm at 31 kHz (median 69130 ohm). The phase is near zero (median 0.25 deg, range -9.0 to 6.8 deg), which fits a large resistor. The medium_tag 'RESISTOR3800' is almost certainly left over from the 3800 ohm run earlier that day. That run read a median of 2382 ohm, far below this one, so the data agrees with the filename. Because of the tag conflict it is not proposed as a calibration standard.","exclude_reason":"medium_tag 'RESISTOR3800' contradicts the name '680kohms'. It looks stale from the earlier 3800 ohm run, and the data supports 680k, but a tag/name conflict needs a human check before any standard.","confidence":0.75,"zat":[null,[680606.0,0.01108],[679659.0,0.03604],[681507.0,0.106],[685499.0,-1.35]],"z1k":681507.0,"spark":[5.833,5.834,5.833,5.833,5.833,5.83,5.83,6.071,5.832,5.832,5.832,5.833,5.832,5.832,5.833,5.834,5.833,5.833,5.824,5.834,5.817,5.828,5.825,5.82],"stats":{"zmax":1499790.0,"zmin":624370.0,"ph_min":-5.87397,"f_ph_min":59.9939,"f_peak":59.9939,"zi_peak":153490.0,"r_lo":680499.0,"r_hi":661077.0}},{"file_id":20,"path":"3800RESISTANCE_eis.csv","filename":"3800RESISTANCE_eis.csv","mtime":1791630000.0,"saved_at":"2026-10-10 06:16","kind":"eis","board":"pcm1808","n_points":71,"f_lo_hz":4.0,"f_hi_hz":28789.1,"fs_hz":96000.0,"r_shunt_ohm":1000.0,"shunts":"1000","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":2381.69,"median_phase_raw_deg":-2.99115,"frac_open":0.0,"temp_c":22.94,"medium_tag":"RESISTOR3800","notes_tag":"","category":"resistor","condition":null,"summary":"A resistor labelled 3800 ohm on the 1000 ohm shunt, multitone, 71 points. The 'RESISTOR3800' tag agrees with the name. Raw |Z| goes from 2741 ohm at 4 Hz down to 1482 ohm at 28.8 kHz (median 2382 ohm), so it sits correctly above the 3300 ohm runs from the day before (about 1920 ohm). However, the drop with frequency and a phase spread of -14.86 to 10.98 deg are much less clean than those runs. 3800 is also an unusual value, so it may be a combination of parts or a mislabel. Fine as a record, but not usable as a calibration standard.","exclude_reason":"Not flat for a resistor: raw |Z| falls from 2741 to 1482 ohm across the band and the phase spans -14.86 to 10.98 deg (median -2.991 deg). 3800 is also not a standard part value.","confidence":0.75,"zat":[null,[3726.55,-0.2857],[3680.26,0.1714],[3689.87,-0.2675],[3655.44,0.6024]],"z1k":3689.87,"spark":[3.569,3.574,3.567,3.579,3.58,3.571,3.572,3.562,3.571,3.567,3.566,3.565,3.561,3.567,3.564,3.561,3.559,3.55,3.565,3.556,3.559,3.57,3.573,3.584],"stats":{"zmax":3834.65,"zmin":3549.27,"ph_min":-1.22406,"f_ph_min":332.211,"f_peak":332.211,"zi_peak":77.8342,"r_lo":3703.85,"r_hi":3832.64}},{"file_id":19,"path":"3300ohms_eis.csv","filename":"3300ohms_eis.csv","mtime":1791540000.0,"saved_at":"2026-10-09 05:24","kind":"eis","board":"pcm1808","n_points":47,"f_lo_hz":4.00026,"f_hi_hz":27006.2,"fs_hz":96000.0,"r_shunt_ohm":1000.0,"shunts":"1000","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":1920.2,"median_phase_raw_deg":-0.448296,"frac_open":0.0,"temp_c":22.81,"medium_tag":"resistor3300\\","notes_tag":"","category":"resistor","condition":null,"summary":"A 3300 ohm resistor on the 1000 ohm shunt, multitone, Wenner fixture. It repeats resistor3300ohms_eis.csv from two minutes earlier, this time saved with a calibration active. Raw |Z| is 1927 ohm at 4 Hz and 1837 ohm at 27 kHz (median 1920 ohm), with phase between -3.331 and -0.013 deg, almost identical to the previous run. The tag 'resistor3300\\' has a stray backslash but agrees with the name. Consistent with its session neighbours and usable as a calibration standard.","exclude_reason":null,"confidence":0.9,"zat":[null,[3305.28,-0.05721],[3303.66,-0.0006126],[3301.05,-0.003372],[3311.33,0.006687]],"z1k":3301.05,"spark":[3.518,3.519,3.518,3.519,3.518,3.519,3.519,3.519,3.519,3.519,3.519,3.519,3.519,3.519,3.519,3.519,3.519,3.519,3.519,3.517,3.519,3.519,3.519,3.519],"stats":{"zmax":3323.91,"zmin":3291.2,"ph_min":-0.201564,"f_ph_min":1832.56,"f_peak":1832.56,"zi_peak":11.6207,"r_lo":3298.2,"r_hi":3301.11}},{"file_id":203,"path":"resistor3300ohms_eis.csv","filename":"resistor3300ohms_eis.csv","mtime":1791540000.0,"saved_at":"2026-10-09 05:22","kind":"eis","board":"pcm1808","n_points":47,"f_lo_hz":4.00026,"f_hi_hz":27006.2,"fs_hz":96000.0,"r_shunt_ohm":1000.0,"shunts":"1000","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":1918.65,"median_phase_raw_deg":-0.387894,"frac_open":0.0,"temp_c":22.88,"medium_tag":"resistor3300","notes_tag":"","category":"resistor","condition":null,"summary":"A 3300 ohm resistor on the 1000 ohm shunt, multitone, Wenner fixture, saved without a calibration active. Raw |Z| is 1929 ohm at 4 Hz and 1836 ohm at 27 kHz (median 1919 ohm), a small droop at the top of the band. The phase stays between -3.29 and -0.017 deg, which fits a resistor. The 'resistor3300' tag agrees. 3300ohms_eis.csv two minutes later repeats it almost exactly (median 1920 ohm). It replaces the inconsistent testresistor3300 run and sits correctly above the 330 ohm reading of 315.4 ohm. Usable as a calibration standard.","exclude_reason":null,"confidence":0.9,"zat":[null,[1922.22,-1.013],[1918.1,-0.09943],[1924.18,-0.07492],[1912.81,-1.914]],"z1k":1924.18,"spark":[3.285,3.284,3.284,3.283,3.283,3.283,3.282,3.283,3.283,3.283,3.283,3.283,3.283,3.284,3.284,3.284,3.284,3.285,3.285,3.284,3.282,3.278,3.273,3.264],"stats":{"zmax":1928.88,"zmin":1836.02,"ph_min":-3.28998,"f_ph_min":27006.2,"f_peak":27006.2,"zi_peak":105.368,"r_lo":1927.33,"r_hi":1832.99}},{"file_id":221,"path":"testresistor3300ohms_eis.csv","filename":"testresistor3300ohms_eis.csv","mtime":1791540000.0,"saved_at":"2026-10-09 05:06","kind":"eis","board":"pcm1808","n_points":47,"f_lo_hz":4.00026,"f_hi_hz":27006.2,"fs_hz":96000.0,"r_shunt_ohm":1000.0,"shunts":"1000","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":5701.43,"median_phase_raw_deg":0.542966,"frac_open":0.0,"temp_c":22.69,"medium_tag":"resistor3300","notes_tag":"","category":"resistor","condition":null,"summary":"Labelled as a 3300 ohm resistor on the 1000 ohm shunt, multitone, saved six minutes after the 330 ohm run. Raw |Z| reads 5682 ohm at 4 Hz and climbs to 6948 ohm at 27 kHz (median 5701 ohm), and the phase reaches 10.66 deg. The two later 3300 ohm runs in the same session read a flat 1919-1920 ohm, so this sweep disagrees by about a factor of three. The likely causes are a bad contact or a different setup at the time. The 'resistor3300' tag agrees with the name. Not usable as a calibration standard.","exclude_reason":"Contradicts same-session neighbours: median raw |Z| is 5701 ohm, but resistor3300ohms and 3300ohms on the same board and shunt read 1919/1920 ohm minutes later; |Z| also rises to 6948 ohm and the phase reaches 10.66 deg. 'test' prefix plus this mismatch makes it a check.","confidence":0.7,"zat":[null,[5970.96,-0.01304],[5842.4,-1.122],[5851.09,1.606],[6273.27,7.641]],"z1k":5851.09,"spark":[3.775,3.772,3.777,3.777,3.773,3.769,3.767,3.767,3.771,3.767,3.769,3.771,3.769,3.761,3.767,3.797,3.791,3.788,3.777,3.793,3.786,3.805,3.831,3.869],"stats":{"zmax":7402.87,"zmin":5764.44,"ph_min":-1.57676,"f_ph_min":1832.56,"f_peak":1832.56,"zi_peak":170.117,"r_lo":5960.54,"r_hi":7195.34}},{"file_id":222,"path":"testrestor330ohmsmultitone_eis.csv","filename":"testrestor330ohmsmultitone_eis.csv","mtime":1791540000.0,"saved_at":"2026-10-09 05:00","kind":"eis","board":"pcm1808","n_points":47,"f_lo_hz":4.00027,"f_hi_hz":27006.2,"fs_hz":96000.0,"r_shunt_ohm":1000.0,"shunts":"1000","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":315.389,"median_phase_raw_deg":-0.029228,"frac_open":0.0,"temp_c":22.69,"medium_tag":"resistor330","notes_tag":"","category":"resistor","condition":null,"summary":"A 330 ohm resistor ('restor' is a typo for resistor) on the 1000 ohm shunt, multitone, on the Wenner fixture. Raw |Z| is very flat: 315.2 ohm at 4 Hz and 313.0 ohm at 27 kHz, median 315.4 ohm. The phase stays between -2.812 and 1.869 deg (median -0.029 deg), which is exactly what a resistor should show. The 'resistor330' tag agrees. It opens the 2026-10-09 session, and it reads correctly below the later 3300 ohm runs (about 1920 ohm). The 'test' prefix is just the owner's habit; nothing else is odd. Usable as a calibration standard.","exclude_reason":null,"confidence":0.88,"zat":[null,[330.207,0.05668],[329.146,-0.7055],[317.062,-0.4544],[331.844,-0.7129]],"z1k":317.062,"spark":[2.519,2.515,2.517,2.518,2.516,2.513,2.518,2.519,2.522,2.518,2.523,2.525,2.522,2.508,2.503,2.504,2.51,2.514,2.5,2.517,2.517,2.521,2.52,2.523],"stats":{"zmax":335.301,"zmin":316.227,"ph_min":-1.32242,"f_ph_min":3954.48,"f_peak":3954.48,"zi_peak":7.29805,"r_lo":330.623,"r_hi":333.514}},{"file_id":188,"path":"drysoil_eis.csv","filename":"drysoil_eis.csv","mtime":1791480000.0,"saved_at":"2026-10-08 12:47","kind":"eis","board":"pcm1808","n_points":47,"f_lo_hz":4.00026,"f_hi_hz":27006.2,"fs_hz":96000.0,"r_shunt_ohm":1000.0,"shunts":"1000","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":168.119,"median_phase_raw_deg":-0.709044,"frac_open":0.0,"temp_c":20.88,"medium_tag":"soil","notes_tag":"","category":"soil","condition":"dry","summary":"Dry soil on the Wenner array with a 1000 ohm shunt, a 47-point multitone sweep taken four minutes after the single-point dryishsoil run. Raw |Z| is 167.6 ohm at 4 Hz and 138.4 ohm at 27 kHz (median 168.1 ohm), only a slight drop across the band. The phase is mostly near zero (median -0.709 deg, minimum -12.74 deg), so little electrode polarisation shows. The 'soil' tag agrees with the name. A reasonable soil record of the dry state.","exclude_reason":null,"confidence":0.8,"zat":[null,[167.797,-0.2462],[169.467,0.2603],[168.975,-1.115],[160.852,-7.934]],"z1k":168.975,"spark":[2.224,2.225,2.224,2.225,2.225,2.226,2.226,2.228,2.229,2.23,2.231,2.231,2.231,2.231,2.229,2.228,2.226,2.226,2.225,2.22,2.211,2.2,2.173,2.141],"stats":{"zmax":170.418,"zmin":138.382,"ph_min":-12.7368,"f_ph_min":27006.2,"f_peak":22280.1,"zi_peak":31.0717,"r_lo":167.561,"r_hi":134.977}},{"file_id":187,"path":"dryishsoil_eis.csv","filename":"dryishsoil_eis.csv","mtime":1791480000.0,"saved_at":"2026-10-08 12:43","kind":"eis","board":"pcm1808","n_points":1,"f_lo_hz":29538.5,"f_hi_hz":29538.5,"fs_hz":96000.0,"r_shunt_ohm":1000.0,"shunts":"1000","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":135.065,"median_phase_raw_deg":-12.7982,"frac_open":0.0,"temp_c":21.12,"medium_tag":"soil","notes_tag":"","category":"soil","condition":"dryish","summary":"Dryish soil on the Wenner array with a 1000 ohm shunt, but only one point was captured, at 29540 Hz, and it was not a multitone sweep. That point reads 135.1 ohm at -12.8 deg, which is plausible for soil at high frequency, but one point gives no spectrum. drysoil_eis.csv followed four minutes later as the full 47-point sweep. The 'soil' tag agrees with the name. Useful only as a spot reading; use the follow-up run for analysis.","exclude_reason":null,"confidence":0.75,"zat":[null,null,null,null,null],"z1k":null,"spark":null,"stats":{"zmax":135.065,"zmin":135.065,"ph_min":-12.7982,"f_ph_min":29538.5,"f_peak":29538.5,"zi_peak":29.9193,"r_lo":131.709,"r_hi":131.709}},{"file_id":199,"path":"prediction510ohms_eis.csv","filename":"prediction510ohms_eis.csv","mtime":1791460000.0,"saved_at":"2026-10-08 07:34","kind":"eis","board":"pcm1808","n_points":100,"f_lo_hz":4.00013,"f_hi_hz":30146.5,"fs_hz":96000.0,"r_shunt_ohm":1000.0,"shunts":"1000","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":78.5651,"median_phase_raw_deg":-1.32482,"frac_open":0.0,"temp_c":23.0,"medium_tag":"","notes_tag":"","category":"resistor","condition":null,"summary":"Labelled as a 510 ohm resistor on the 1000 ohm shunt, multitone, saved with a calibration active. The word 'prediction' marks it as a check of a calibration rather than a reference measurement. The data does not look like a clean resistor: raw |Z| falls from 141.3 ohm at 4 Hz to 26.34 ohm at 30 kHz (median 78.57 ohm), and the phase drops to -40.5 deg where a resistor should stay near 0. Either something reactive was in the fixture or the device was different. The value comes from the name only. Not usable as a calibration standard.","exclude_reason":"'prediction' in the name means this was a check of a calibration; raw |Z| is not flat (141.3 -\u003e 26.34 ohm) and the phase reaches -40.5 deg, which is not plausible for a plain resistor.","confidence":0.55,"zat":[null,[130.034,-0.454],[71.1039,-0.3479],[64.8477,-2.128],[41.8932,-20.65]],"z1k":64.8477,"spark":[2.113,2.113,2.113,2.115,2.115,2.115,2.115,2.072,1.852,1.852,1.85,1.851,1.851,1.851,1.85,1.701,1.77,1.688,1.674,1.646,1.671,1.546,1.543,1.475],"stats":{"zmax":130.746,"zmin":29.8348,"ph_min":-30.9912,"f_ph_min":14574.4,"f_peak":14574.4,"zi_peak":15.8455,"r_lo":129.729,"r_hi":28.8232}},{"file_id":230,"path":"wateradded_eis.csv","filename":"wateradded_eis.csv","mtime":1791400000.0,"saved_at":"2026-10-07 14:26","kind":"eis","board":"pcm1808","n_points":100,"f_lo_hz":4.00017,"f_hi_hz":30159.2,"fs_hz":96000.0,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":17504.8,"median_phase_raw_deg":10.5322,"frac_open":0.0,"temp_c":24.31,"medium_tag":"soil","notes_tag":"","category":"soil","condition":"water added","summary":"Soil on the 4-rod Wenner array, saved just after water was added, using a 680 ohm shunt. This is the only run here on that shunt. Raw |Z| goes from 8982 ohm at 4 Hz to 15530 ohm at 30 kHz with a median of 17500 ohm, so it is high and rises with frequency instead of falling. The phase wraps between -170.7 and 175.4 deg with a median of +10.53 deg, which means some points look inverted or wrapped rather than showing a clean soil response. The 'soil' tag agrees with the name. Trust it as a soil record, but the phase data is questionable.","exclude_reason":null,"confidence":0.7,"zat":[null,[3257.47,-14.49],[4403.29,12.84],[6585.05,45.52],[7570.35,-48.19]],"z1k":6585.05,"spark":[3.399,3.433,3.497,3.555,3.575,3.595,3.632,3.65,3.631,3.66,3.698,3.702,3.767,3.801,3.86,3.706,3.792,4.275,4.037,3.859,3.776,4.108,3.846,3.668],"stats":{"zmax":52385.4,"zmin":2502.9,"ph_min":-168.264,"f_ph_min":2623.35,"f_peak":2429.03,"zi_peak":12926.8,"r_lo":2430.21,"r_hi":1285.41}},{"file_id":216,"path":"testdrypottingsoil_eis.csv","filename":"testdrypottingsoil_eis.csv","mtime":1791400000.0,"saved_at":"2026-10-07 14:21","kind":"eis","board":"pcm1808","n_points":100,"f_lo_hz":4.00012,"f_hi_hz":30159.2,"fs_hz":96000.0,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":3139.59,"median_phase_raw_deg":-15.3458,"frac_open":0.0,"temp_c":26.19,"medium_tag":"soil","notes_tag":"","category":"soil","condition":"dry potting soil","summary":"Dry potting soil, wenner4 fixture, pcm1808 board, 680 ohm shunt, 100 multitone points at 26.19 C, the last run of 2026-10-07. Raw |Z| is 5220 ohm at the low end and 5817 ohm at the high end, but the median is only 3140 ohm. That is lower than the 'relatively dry' run ten minutes earlier (14220 ohm), which is surprising for drier soil. The phase ranges from -101.4 to +48.79 deg (median -15.35 deg). The negative median fits soil polarisation, but the spread suggests noisy or wrapped points. Moderate trust.","exclude_reason":null,"confidence":0.7,"zat":[null,[1233.27,-14.41],[915.376,-14.27],[625.163,-23.31],[272.941,6.434]],"z1k":625.163,"spark":[3.163,3.142,3.109,3.071,3.048,3.015,2.972,2.967,2.963,2.943,2.893,2.891,2.852,2.804,2.771,2.854,2.96,2.807,2.81,2.903,2.489,2.925,2.986,3.242],"stats":{"zmax":1745.26,"zmin":157.549,"ph_min":-95.234,"f_ph_min":13311.1,"f_peak":7772.89,"zi_peak":1137.62,"r_lo":1416.59,"r_hi":1740.3}},{"file_id":202,"path":"relativelydrypottingsoil_eis.csv","filename":"relativelydrypottingsoil_eis.csv","mtime":1791400000.0,"saved_at":"2026-10-07 14:11","kind":"eis","board":"pcm1808","n_points":100,"f_lo_hz":4.00012,"f_hi_hz":30159.2,"fs_hz":96000.0,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":14220.0,"median_phase_raw_deg":10.1403,"frac_open":0.0,"temp_c":23.31,"medium_tag":"soil","notes_tag":"","category":"soil","condition":"relatively dry potting soil","summary":"Relatively dry potting soil, wenner4 fixture, pcm1808 board, 680 ohm shunt, 100 multitone points from 4 Hz to 30.2 kHz at 23.31 C. Raw |Z| is 10860 ohm at the low end and 10690 ohm at the high end, with a higher median of 14220 ohm. That is higher than the watered plant runs, as expected for drier soil. The phase is positive, 0.29 to 27.07 deg (median 10.14 deg), which is odd for soil and may be a front-end artefact at this impedance level. All points resolved. Fair trust for the magnitude.","exclude_reason":null,"confidence":0.8,"zat":[null,[3528.28,11.5],[4498.74,10.79],[5477.14,11.98],[4090.94,11.98]],"z1k":5477.14,"spark":[3.481,3.496,3.522,3.557,3.565,3.592,3.638,3.648,3.644,3.663,3.726,3.714,3.733,3.794,3.788,3.585,3.61,3.6,3.61,3.593,3.603,3.616,3.659,3.506],"stats":{"zmax":6438.7,"zmin":3026.68,"ph_min":1.31311,"f_ph_min":1554.58,"f_peak":1554.58,"zi_peak":-87.5782,"r_lo":2974.7,"r_hi":2760.82}},{"file_id":228,"path":"tropicalplant_eis.csv","filename":"tropicalplant_eis.csv","mtime":1791400000.0,"saved_at":"2026-10-07 14:07","kind":"eis","board":"pcm1808","n_points":100,"f_lo_hz":4.00016,"f_hi_hz":30159.2,"fs_hz":96000.0,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":2269.4,"median_phase_raw_deg":37.2361,"frac_open":0.0,"temp_c":23.12,"medium_tag":"soil","notes_tag":"","category":"plant","condition":"tropical plant","summary":"Tropical plant soil, wenner4 fixture, pcm1808 board, 680 ohm shunt, 100 multitone points at 23.12 C, calibration active. Raw |Z| falls from 3113 ohm at the low end to 1202 ohm at the high end (median 2269 ohm), lower than the earlier semiwet and watered runs, perhaps as the added water soaked in. The phase jumps from -162.6 to +176.7 deg (median 37.24 deg), which points to phase wrapping or polarity trouble. No watering state is given. Trust the magnitude roughly, not the phase.","exclude_reason":null,"confidence":0.65,"zat":[null,[1115.78,-62.4],[1389.2,120.5],[299.283,81.68],[166.797,-13.18]],"z1k":299.283,"spark":[2.938,2.967,3.001,3.187,3.285,3.517,3.477,3.331,3.203,3.038,2.903,2.809,2.686,2.57,2.464,2.525,2.305,2.197,2.065,2.244,2.3,2.091,2.452,2.557],"stats":{"zmax":4401.09,"zmin":64.5322,"ph_min":-162.464,"f_ph_min":34.9105,"f_peak":29.0921,"zi_peak":3423.29,"r_lo":762.115,"r_hi":83.7753}},{"file_id":210,"path":"test330ohmsmt_eis.csv","filename":"test330ohmsmt_eis.csv","mtime":1791400000.0,"saved_at":"2026-10-07 13:37","kind":"eis","board":"pcm1808","n_points":100,"f_lo_hz":4.00011,"f_hi_hz":30159.2,"fs_hz":96000.0,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":12983.9,"median_phase_raw_deg":-0.0287198,"frac_open":0.0,"temp_c":23.31,"medium_tag":"resistor","notes_tag":"","category":"resistor","condition":null,"summary":"Labelled a 330 ohm resistor, multitone ('mt'), on the wenner4 fixture, pcm1808 board, 680 ohm shunt, 100 points at 23.31 C. Raw |Z| is 14030 ohm at the low end and 14640 ohm at the high end (median 12980 ohm). That is about 26 times the 493.9 to 496.6 ohm the same value read on the same board and shunt that morning, and it even exceeds the plant soil runs. The median phase of -0.02872 deg looks resistive, but the magnitude contradicts its neighbours. It was likely a wiring fault, a different part, or the fixture still connected after the plant runs. Not usable as a calibration standard.","exclude_reason":"raw median 12980 ohm vs 493.9-496.6 ohm for the same 330 ohm on the same board+shunt that morning; contradicts neighbours (likely wiring/fixture problem)","confidence":0.5,"zat":[null,[319.94,0.254],[327.708,-0.317],[330.935,0.06471],[331.062,0.1852]],"z1k":330.935,"spark":[2.486,2.518,2.508,2.515,2.518,2.52,2.519,2.521,2.519,2.515,2.52,2.519,2.518,2.519,2.517,2.515,2.522,2.52,2.517,2.523,2.519,2.519,2.518,2.517],"stats":{"zmax":348.225,"zmin":306.093,"ph_min":-15.9713,"f_ph_min":4.00011,"f_peak":4.00011,"zi_peak":84.2235,"r_lo":294.278,"r_hi":329.033}},{"file_id":229,"path":"tropicalplantwet4tablespoonsaddedwater_eis.csv","filename":"tropicalplantwet4tablespoonsaddedwater_eis.csv","mtime":1791400000.0,"saved_at":"2026-10-07 13:25","kind":"eis","board":"pcm1808","n_points":100,"f_lo_hz":4.00012,"f_hi_hz":30159.2,"fs_hz":96000.0,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":5079.4,"median_phase_raw_deg":-18.3523,"frac_open":0.0,"temp_c":23.38,"medium_tag":"soil","notes_tag":"","category":"plant","condition":"wet, 4 tablespoons added water","summary":"The tropical plant's soil after adding 4 tablespoons of water, wenner4 fixture, pcm1808 board, 680 ohm shunt, 100 multitone points at 23.38 C. Raw |Z| falls from 7048 ohm at the low end to 3683 ohm at the high end (median 5079 ohm), below the semiwet run's 8804 ohm, which is as expected for added water. The phase is erratic, from -151.2 to +91.81 deg (median -18.35 deg), which suggests noise or phase wrapping on some points. It is the second step of the watering series. The magnitude trend is credible, the phase less so.","exclude_reason":null,"confidence":0.75,"zat":[null,[5636.49,8.853],[5883.82,-8.631],[4590.38,-34.95],[6894.27,-115.3]],"z1k":4590.38,"spark":[3.848,3.565,3.764,3.697,3.715,3.725,3.714,3.653,3.773,3.761,3.747,3.727,3.711,3.687,3.663,3.628,3.611,3.625,3.561,3.638,3.789,3.832,3.771,3.566],"stats":{"zmax":9756.52,"zmin":1797.53,"ph_min":-151.215,"f_ph_min":15934.4,"f_peak":22222.6,"zi_peak":9358.77,"r_lo":6935.6,"r_hi":2772.79}},{"file_id":227,"path":"tropical plant semiwet_eis.csv","filename":"tropical plant semiwet_eis.csv","mtime":1791400000.0,"saved_at":"2026-10-07 13:21","kind":"eis","board":"pcm1808","n_points":100,"f_lo_hz":4.00013,"f_hi_hz":30159.5,"fs_hz":96000.0,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":8803.79,"median_phase_raw_deg":1.40918,"frac_open":0.0,"temp_c":23.44,"medium_tag":"soil","notes_tag":"","category":"plant","condition":"tropical plant, semiwet","summary":"Soil of a tropical plant in a semiwet state, wenner4 fixture, pcm1808 board, 680 ohm shunt, 100 multitone points from 4 Hz to 30.2 kHz at 23.44 C, no calibration active. Raw |Z| is nearly flat, 8148 ohm at the low end and 8955 ohm at the high end (median 8804 ohm). The phase is 0.1 to 3.35 deg (median 1.409 deg), which is surprisingly resistive for soil but not impossible for moist, conductive potting mix. It is the first of a plant watering series, followed four minutes later by the run after 4 tablespoons of water. Clean data; trust is fair.","exclude_reason":null,"confidence":0.8,"zat":[null,[8295.58,1.723],[8670.0,1.441],[8903.62,0.7599],[9045.45,1.996]],"z1k":8903.62,"spark":[3.911,3.914,3.918,3.921,3.925,3.928,3.931,3.935,3.937,3.94,3.942,3.944,3.946,3.947,3.949,3.949,3.952,3.954,3.951,3.954,3.955,3.956,3.952,3.952],"stats":{"zmax":9132.52,"zmin":8147.87,"ph_min":0.116202,"f_ph_min":2429.03,"f_peak":2429.03,"zi_peak":-18.2013,"r_lo":8145.51,"r_hi":8940.19}},{"file_id":198,"path":"opencal_20261007_131318_eis.csv","filename":"opencal_20261007_131318_eis.csv","mtime":1791400000.0,"saved_at":"2026-10-07 13:14","kind":"eis","board":"pcm1808","n_points":17,"f_lo_hz":6857.14,"f_hi_hz":29538.5,"fs_hz":96000.0,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":2476.41,"median_phase_raw_deg":-1.42987,"frac_open":0.0,"temp_c":25.0,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"Open-circuit calibration sweep on the wenner4 fixture, pcm1808 board, 680 ohm shunt, 17 points from 6.9 to 29.5 kHz at 25 C. Raw |Z| is 4128 ohm at the low end and 4179 ohm at the high end, but the median is 2476 ohm. The phase scatters from -76.43 to +47.52 deg, with a median of -1.43 deg. So the open is noisy and covers only high frequencies. It was taken midday, just before the tropical-plant runs. Treat it as an open reference with caution.","exclude_reason":null,"confidence":0.65,"zat":[null,null,null,null,[2911.04,33.82]],"z1k":null,"spark":[3.616,3.636,3.656,3.675,3.702,3.741,3.442,3.244,3.27,3.341,3.378,3.375,3.376,3.323,3.302,3.352,3.386,3.392,3.466,3.647,3.684,3.645,3.583,3.621],"stats":{"zmax":5602.67,"zmin":1707.33,"ph_min":-76.4304,"f_ph_min":29538.5,"f_peak":29538.5,"zi_peak":4062.22,"r_lo":2871.87,"r_hi":980.471}},{"file_id":212,"path":"test680kohmsmuktitone_eis.csv","filename":"test680kohmsmuktitone_eis.csv","mtime":1791390000.0,"saved_at":"2026-10-07 12:10","kind":"eis","board":"pcm1808","n_points":100,"f_lo_hz":4.00012,"f_hi_hz":30159.2,"fs_hz":96000.0,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":21027.0,"median_phase_raw_deg":-1.07278,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"resistor","condition":null,"summary":"A 680 kohm resistor ('muktitone' read as multitone) on the wenner4 fixture, pcm1808 board, 680 ohm shunt, 100 points from 4 Hz to 30.2 kHz. Raw |Z| is 21170 ohm at the low end and 19520 ohm at the high end (median 21030 ohm). That is presumably near the ceiling for this shunt and correctly above the 330 ohm runs at about 494 ohm. The median phase is -1.073 deg, but it ranges from -32.12 to +15.33 deg, plausibly from parasitic capacitance at such a high value. All points resolved. Proposed as a standard with moderate confidence. The reviewer should note that the 330 ohm run at 13:37 later in the session reads anomalously high.","exclude_reason":null,"confidence":0.75,"zat":[null,[671440.0,-0.9108],[652061.0,-0.04988],[747986.0,-4.764],[873010.0,-8.487]],"z1k":747986.0,"spark":[5.819,5.795,5.831,5.832,5.812,5.83,5.838,5.835,5.81,5.804,5.843,5.812,5.818,5.836,5.831,5.968,5.918,5.991,5.97,6.072,5.992,5.962,5.711,5.852],"stats":{"zmax":1239760.0,"zmin":489135.0,"ph_min":-24.9876,"f_ph_min":3400.64,"f_peak":3400.64,"zi_peak":421850.0,"r_lo":657968.0,"r_hi":710919.0}},{"file_id":211,"path":"test330ohmsmultitone_eis.csv","filename":"test330ohmsmultitone_eis.csv","mtime":1791390000.0,"saved_at":"2026-10-07 10:47","kind":"eis","board":"pcm1808","n_points":200,"f_lo_hz":3.99879,"f_hi_hz":29679.5,"fs_hz":96000.0,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":496.581,"median_phase_raw_deg":-0.505522,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"resistor","condition":null,"summary":"A 330 ohm resistor on the wenner4 fixture, pcm1808 board, 680 ohm shunt, a 200-point multitone sweep from 4 Hz to 29.7 kHz. Raw |Z| is 493.1 ohm at the low end and 456.4 ohm at the high end (median 496.6 ohm). The median phase is -0.5055 deg, dipping to -16.0 deg at one band edge. That is consistent with the two earlier 330 ohm runs this morning (493.9 and 494.8 ohm). All points resolved. The name is clear and the data agrees, so it is proposed as a multitone calibration standard.","exclude_reason":null,"confidence":0.9,"zat":[null,[330.924,-0.008342],[329.932,-0.1268],[330.493,0.007237],[330.517,-0.04046]],"z1k":330.493,"spark":[2.517,2.518,2.52,2.52,2.519,2.52,2.518,2.519,2.519,2.519,2.519,2.52,2.519,2.519,2.519,2.519,2.519,2.519,2.519,2.519,2.519,2.518,2.519,2.519],"stats":{"zmax":339.862,"zmin":327.749,"ph_min":-0.779231,"f_ph_min":3.99879,"f_peak":3.99879,"zi_peak":4.4692,"r_lo":328.594,"r_hi":330.673}},{"file_id":218,"path":"testmultitone_eis.csv","filename":"testmultitone_eis.csv","mtime":1791390000.0,"saved_at":"2026-10-07 10:43","kind":"eis","board":"pcm1808","n_points":80,"f_lo_hz":4.00012,"f_hi_hz":29814.3,"fs_hz":96000.0,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":494.833,"median_phase_raw_deg":-0.227795,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"330ohms","category":"resistor","condition":null,"summary":"A 330 ohm resistor (value from the notes tag '330ohms') on the wenner4 fixture, pcm1808 board, 680 ohm shunt, 80 multitone points from 4 Hz to 29.8 kHz. Raw |Z| is 493.9 ohm at the low end and 491.5 ohm at the high end (median 494.8 ohm), and the median phase is -0.2278 deg. That is a clean resistive response matching the stepped test330ohms run two minutes earlier. All points resolved. The value comes only from the tag, but the data agrees closely with its neighbours, so it is proposed as a calibration standard with slightly lower confidence.","exclude_reason":null,"confidence":0.8,"zat":[null,[755.886,16.76],[1082.77,10.21],[1211.29,0.3115],[2094.09,-23.67]],"z1k":1211.29,"spark":[2.785,2.825,2.857,2.897,2.928,2.955,2.991,2.992,3.01,3.038,3.048,3.053,3.07,3.067,3.082,3.338,3.235,3.291,3.323,3.442,3.356,3.319,3.319,3.073],"stats":{"zmax":2772.57,"zmin":606.164,"ph_min":-43.523,"f_ph_min":23949.2,"f_peak":21505.4,"zi_peak":1351.14,"r_lo":587.199,"r_hi":958.375}},{"file_id":209,"path":"test330ohms_eis.csv","filename":"test330ohms_eis.csv","mtime":1791390000.0,"saved_at":"2026-10-07 10:41","kind":"eis","board":"pcm1808","n_points":8,"f_lo_hz":4.01079,"f_hi_hz":29538.5,"fs_hz":96000.0,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":493.927,"median_phase_raw_deg":-0.227299,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"resistor","condition":null,"summary":"A 330 ohm resistor on the wenner4 fixture, pcm1808 board, 680 ohm shunt, a stepped 8-point sweep from 4 Hz to 29.5 kHz. Raw |Z| is 494.4 ohm at the low end and 462.2 ohm at the high end (median 493.9 ohm), steady apart from a small droop at the top. The median phase is -0.2273 deg, with a minimum of -13.6 deg at one end, which is clean resistor behaviour. All points resolved. Two multitone repeats later that morning read the same (494.8 and 496.6 ohm). The name and data agree with repeatable neighbours, so it is proposed as a calibration standard.","exclude_reason":null,"confidence":0.9,"zat":[null,[330.667,0.01167],[330.659,-0.006446],[330.677,-0.03296],[337.422,-0.03988]],"z1k":330.677,"spark":[2.519,2.519,2.519,2.519,2.519,2.519,2.519,2.519,2.519,2.519,2.519,2.519,2.519,2.519,2.519,2.519,2.52,2.522,2.524,2.527,2.529,2.526,2.523,2.52],"stats":{"zmax":338.336,"zmin":330.597,"ph_min":-0.172807,"f_ph_min":29538.5,"f_peak":29538.5,"zi_peak":0.997655,"r_lo":330.597,"r_hi":330.781}},{"file_id":223,"path":"testsaltwater_eis.csv","filename":"testsaltwater_eis.csv","mtime":1791390000.0,"saved_at":"2026-10-07 10:24","kind":"eis","board":"pcm1808","n_points":95,"f_lo_hz":10.0005,"f_hi_hz":28815.5,"fs_hz":96000.0,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":328.91,"median_phase_raw_deg":179.297,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"water","condition":"salty","summary":"Salt water on the wenner4 fixture, pcm1808 board, 680 ohm shunt, a multitone sweep of 95 points from 10 Hz to 28.8 kHz. Raw |Z| is flat, 328.9 ohm at the low end and 318.5 ohm at the high end. The phase sits at about +/-180 deg (median 179.3 deg), which points to inverted polarity or swapped leads rather than a real 180 deg response. Apart from that sign flip, the flat magnitude fits conductive water. All points resolved. Usable for magnitude only after a polarity correction.","exclude_reason":null,"confidence":0.65,"zat":[null,null,[725.934,-169.8],[801.785,-178.5],[1431.69,158.6]],"z1k":801.785,"spark":[2.706,2.73,2.75,2.772,2.814,2.821,2.825,2.86,2.866,2.878,2.873,2.907,2.889,2.904,3.172,3.179,3.139,3.137,3.182,3.173,3.145,3.164,3.149,2.886],"stats":{"zmax":1778.59,"zmin":507.667,"ph_min":-179.671,"f_ph_min":2391.55,"f_peak":1752.03,"zi_peak":316.373,"r_lo":-485.122,"r_hi":-679.147}},{"file_id":197,"path":"opencal_20261007_063952_eis.csv","filename":"opencal_20261007_063952_eis.csv","mtime":1791370000.0,"saved_at":"2026-10-07 06:40","kind":"eis","board":"pcm1808","n_points":8,"f_lo_hz":19637.5,"f_hi_hz":39547.8,"fs_hz":96000.0,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":151.437,"median_phase_raw_deg":94.0732,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"Open-circuit calibration sweep on the wenner4 fixture, pcm1808 board, now with a 680 ohm shunt. Only 8 points were captured, from 19.6 to 39.6 kHz. Raw |Z| goes from 793.6 ohm to 371.0 ohm (median 151.4 ohm). The phase is strange, +9.184 to +150.5 deg with a median of 94.07 deg, which suggests inverted polarity or phase wrapping rather than a normal capacitive open. It opens the 2026-10-07 session. Only high frequencies were covered and the phase is odd, so trust it as an open reference only with caution.","exclude_reason":null,"confidence":0.6,"zat":[null,null,null,null,null],"z1k":null,"spark":[2.9,2.665,2.431,2.197,2.232,2.299,2.366,2.433,2.375,1.945,1.515,1.627,2.037,2.14,2.063,1.987,1.891,1.741,1.59,1.44,1.702,1.991,2.28,2.569],"stats":{"zmax":793.589,"zmin":23.0359,"ph_min":9.18368,"f_ph_min":35081.3,"f_peak":35081.3,"zi_peak":-4.30464,"r_lo":-690.462,"r_hi":255.312}},{"file_id":200,"path":"probe_eis.csv","filename":"probe_eis.csv","mtime":1789810000.0,"saved_at":"2026-09-19 05:30","kind":"eis","board":"pcm1808","n_points":192,"f_lo_hz":4876.14,"f_hi_hz":31036.1,"fs_hz":96000.0,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":5.88032,"median_phase_raw_deg":-89.2818,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"test","condition":null,"summary":"A probe test: 192 multitone points from 4.9 to 31 kHz on the pcm1808 board, 100 ohm shunt, calibration active. Raw |Z| goes from 14.83 ohm to 2.331 ohm (median 5.88 ohm), with a median phase of -89.28 deg. That is almost exactly the same as sim_multitone_test_eis from 04:32, so it is either a repeat with the fixture unchanged or the same data saved twice. The purely capacitive response suggests an open fixture. Low information; filed as a test.","exclude_reason":null,"confidence":0.4,"zat":[null,null,null,null,[470.108,-0.0002245]],"z1k":null,"spark":[2.672,2.672,2.672,2.672,2.672,2.672,2.672,2.672,2.672,2.672,2.672,2.672,2.672,2.672,2.672,2.672,2.672,2.672,2.672,2.672,2.672,2.672,2.672,2.671],"stats":{"zmax":470.205,"zmin":469.073,"ph_min":-0.0130176,"f_ph_min":19873.9,"f_peak":19873.9,"zi_peak":0.106794,"r_lo":470.011,"r_hi":469.073}},{"file_id":27,"path":"caltest_eis.csv","filename":"caltest_eis.csv","mtime":1789810000.0,"saved_at":"2026-09-19 05:15","kind":"eis","board":"pcm1808","n_points":4,"f_lo_hz":500.0,"f_hi_hz":5000.0,"fs_hz":96000.0,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":48.7928,"median_phase_raw_deg":-84.0368,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"test","condition":null,"summary":"A calibration check: 4 points from 500 Hz to 5 kHz on the pcm1808 board, 100 ohm shunt, calibration active, flagged as multitone. Raw |Z| goes from 138.3 ohm to 14.46 ohm (median 48.79 ohm), with a median phase of -84.04 deg. That is strongly capacitive and consistent with the 100 ohm open sweeps from the same night, so it is probably an open or a capacitor. The name marks it as a check of a calibration, not a reference. Too few points to be informative.","exclude_reason":null,"confidence":0.5,"zat":[null,null,null,[642.351,-81.0],null],"z1k":642.351,"spark":[3.095,3.054,3.012,2.971,2.929,2.888,2.846,2.805,2.763,2.72,2.677,2.634,2.59,2.547,2.504,2.461,2.418,2.375,2.331,2.288,2.245,2.201,2.158,2.114],"stats":{"zmax":1244.54,"zmin":130.155,"ph_min":-88.2359,"f_ph_min":5000.0,"f_peak":500.0,"zi_peak":1189.46,"r_lo":366.157,"r_hi":4.00676}},{"file_id":206,"path":"sim_multitone_test_eis.csv","filename":"sim_multitone_test_eis.csv","mtime":1789810000.0,"saved_at":"2026-09-19 04:32","kind":"eis","board":"pcm1808","n_points":192,"f_lo_hz":4876.14,"f_hi_hz":31036.1,"fs_hz":96000.0,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":5.88034,"median_phase_raw_deg":-89.2853,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"test","condition":null,"summary":"A multitone test, possibly a simulation ('sim'), with 192 points from 4.9 to 31 kHz on the pcm1808 board, 100 ohm shunt, calibration active. Raw |Z| goes from 14.83 ohm to 2.33 ohm (median 5.88 ohm), with a median phase of -89.29 deg. That is purely capacitive and looks like the stray capacitance of an open fixture. The features are essentially identical to probe_eis an hour later, so the two may share the same data. It is a software or processing test, not a measurement of a known device.","exclude_reason":null,"confidence":0.5,"zat":[null,null,null,null,[471.16,0.004345]],"z1k":null,"spark":[2.679,2.681,2.68,2.676,2.674,2.679,2.681,2.68,2.676,2.674,2.679,2.681,2.68,2.677,2.673,2.679,2.681,2.68,2.677,2.673,2.679,2.681,2.68,2.677],"stats":{"zmax":479.749,"zmin":470.036,"ph_min":-0.0186775,"f_ph_min":30146.8,"f_peak":30146.8,"zi_peak":0.155387,"r_lo":477.816,"r_hi":474.978}},{"file_id":201,"path":"prof_eis.csv","filename":"prof_eis.csv","mtime":1789810000.0,"saved_at":"2026-09-19 04:26","kind":"eis","board":"pcm1808","n_points":96,"f_lo_hz":12361.6,"f_hi_hz":31036.1,"fs_hz":96000.0,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":3.69366,"median_phase_raw_deg":-89.5519,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"test","condition":null,"summary":"An unclear run named 'prof': 96 multitone points from 12.4 to 31 kHz on the pcm1808 board with a 100 ohm shunt and the calibration active. Raw |Z| falls from 5.852 ohm to 2.331 ohm (median 3.694 ohm), and the phase sits at about -89.55 deg throughout. That is purely capacitive, similar to the high-frequency end of the 100 ohm open sweeps, so it is probably an open or stray-capacitance check rather than a real part. The name gives no device or value, and no array type was recorded. Low trust; filed as a test.","exclude_reason":null,"confidence":0.35,"zat":[null,null,null,null,null],"z1k":null,"spark":[2.681,2.68,2.678,2.676,2.674,2.674,2.677,2.679,2.68,2.681,2.681,2.68,2.679,2.677,2.674,2.673,2.677,2.679,2.68,2.681,2.681,2.68,2.679,2.677],"stats":{"zmax":479.696,"zmin":470.207,"ph_min":-0.0275956,"f_ph_min":31036.1,"f_peak":31036.1,"zi_peak":0.228842,"r_lo":479.462,"r_hi":475.137}},{"file_id":196,"path":"opencal_20260919_020218_eis.csv","filename":"opencal_20260919_020218_eis.csv","mtime":1789800000.0,"saved_at":"2026-09-19 02:03","kind":"eis","board":"pcm1808","n_points":10,"f_lo_hz":2.95801,"f_hi_hz":35087.2,"fs_hz":96000.0,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":188.224,"median_phase_raw_deg":-40.6885,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"Open-circuit calibration sweep on the wenner4 fixture, pcm1808 board, 100 ohm shunt. It is the last of the 2026-09-19 opencals. Raw |Z| goes from 469.9 ohm to 0.02754 ohm (median 188.2 ohm), with a median phase of -40.69 deg. It is a near-exact repeat of the 02:00 sweep, which shows good repeatability, but the identical medians also mean it adds nothing new. All points resolved. Usable open reference for the 100 ohm shunt.","exclude_reason":null,"confidence":0.85,"zat":[null,[468.418,-4.161],[373.056,-34.04],[70.8151,-80.19],[7.31281,-88.97]],"z1k":70.8151,"spark":[2.672,2.672,2.672,2.671,2.669,2.667,2.656,2.64,2.618,2.545,2.472,2.365,2.212,2.058,1.896,1.732,1.566,1.382,1.197,1.02,0.851,0.682,-0.325,-1.56],"stats":{"zmax":469.912,"zmin":0.027537,"ph_min":-89.46,"f_ph_min":16941.2,"f_peak":222.235,"zi_peak":220.208,"r_lo":469.823,"r_hi":0.027537}},{"file_id":195,"path":"opencal_20260919_020057_eis.csv","filename":"opencal_20260919_020057_eis.csv","mtime":1789800000.0,"saved_at":"2026-09-19 02:01","kind":"eis","board":"pcm1808","n_points":10,"f_lo_hz":2.99397,"f_hi_hz":35205.2,"fs_hz":96000.0,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":188.222,"median_phase_raw_deg":-40.6882,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"Open-circuit calibration sweep on the wenner4 fixture, pcm1808 board, 100 ohm shunt, 10 points from 3 Hz to 35 kHz. Raw |Z| goes from 469.9 ohm at the low end to 0.0275 ohm at the top (median 188.2 ohm), with a median phase of -40.69 deg and a minimum of -89.46 deg. That is a capacitive open signature with the recurring 469.9 ohm low-frequency clamp. The 02:02 opencal has the same median |Z| and phase, so it is effectively a duplicate. Usable 100 ohm shunt open reference.","exclude_reason":null,"confidence":0.85,"zat":[null,[468.392,-4.19],[373.266,-34.0],[70.2993,-80.25],[7.3128,-88.97]],"z1k":70.2993,"spark":[2.672,2.672,2.672,2.671,2.669,2.667,2.655,2.639,2.617,2.544,2.47,2.362,2.206,2.05,1.889,1.727,1.564,1.379,1.194,1.018,0.849,0.68,-0.332,-1.561],"stats":{"zmax":469.911,"zmin":0.0275042,"ph_min":-89.4628,"f_ph_min":16941.2,"f_peak":222.887,"zi_peak":220.204,"r_lo":469.822,"r_hi":0.0275042}},{"file_id":194,"path":"opencal_20260919_015812_eis.csv","filename":"opencal_20260919_015812_eis.csv","mtime":1789800000.0,"saved_at":"2026-09-19 01:59","kind":"eis","board":"pcm1808","n_points":20,"f_lo_hz":3.00442,"f_hi_hz":45176.5,"fs_hz":96000.0,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":179.442,"median_phase_raw_deg":-55.6605,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"Open-circuit calibration sweep on the wenner4 fixture, pcm1808 board, 100 ohm shunt, 20 points from 3 Hz to 45 kHz. Raw |Z| goes from 469.9 ohm at the low end (the same apparent clamp value as the 01:16 open) down to 0.02755 ohm at the top (median 179.4 ohm). The median phase is -55.66 deg, with a maximum of essentially 0 deg. The tiny high-frequency |Z| suggests the top points are near the noise floor. It is one of four 100 ohm opens taken that night. Usable open reference with moderate trust.","exclude_reason":null,"confidence":0.85,"zat":[null,[468.802,-3.964],[391.156,-33.45],[69.8331,-81.19],[7.52823,-89.06]],"z1k":69.8331,"spark":[2.672,2.672,2.672,2.671,2.669,2.666,2.66,2.643,2.608,2.548,2.457,2.33,2.179,2.004,1.824,1.64,1.45,1.269,1.121,0.95,0.761,0.569,0.211,-1.56],"stats":{"zmax":469.909,"zmin":0.0275523,"ph_min":-89.6932,"f_ph_min":28444.4,"f_peak":176.217,"zi_peak":232.782,"r_lo":469.82,"r_hi":0.0275523}},{"file_id":189,"path":"freq_dom_check_eis.csv","filename":"freq_dom_check_eis.csv","mtime":1789800000.0,"saved_at":"2026-09-19 01:54","kind":"eis","board":"pcm1808","n_points":95,"f_lo_hz":3.0,"f_hi_hz":30601.7,"fs_hz":96000.0,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":231.049,"median_phase_raw_deg":-59.5014,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"test","condition":null,"summary":"A frequency-domain check, which looks like a multitone (multitone_guess 1) sweep of 95 points from 3 Hz to 30.6 kHz on the pcm1808 board with a 100 ohm shunt and the calibration active. Raw |Z| goes from 467.0 ohm to 2.364 ohm (median 231.0 ohm), with a median phase of -59.5 deg and a minimum of -89.68 deg. That closely matches the 100 ohm opencal sweeps around it, so the terminals were probably open and the run was a check of the multitone processing. Filed as a test. No array type was recorded.","exclude_reason":null,"confidence":0.5,"zat":[null,[470.753,0.1131],[478.438,-0.2892],[473.232,-1.646],[474.321,0.009436]],"z1k":473.232,"spark":[2.669,2.672,2.666,2.673,2.672,2.672,2.648,2.678,2.674,2.679,2.673,2.674,2.603,2.682,2.68,2.679,2.676,2.676,2.676,2.676,2.677,2.677,2.677,2.678],"stats":{"zmax":560.762,"zmin":399.205,"ph_min":-5.73915,"f_ph_min":34.9337,"f_peak":34.9337,"zi_peak":44.8054,"r_lo":467.114,"r_hi":475.951}},{"file_id":193,"path":"opencal_20260919_011638_eis.csv","filename":"opencal_20260919_011638_eis.csv","mtime":1789800000.0,"saved_at":"2026-09-19 01:17","kind":"eis","board":"pcm1808","n_points":10,"f_lo_hz":2.99152,"f_hi_hz":48000.0,"fs_hz":96000.0,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":185.425,"median_phase_raw_deg":-66.3311,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"Open-circuit calibration sweep on the wenner4 fixture, pcm1808 board, now with a 100 ohm shunt after the earlier 470 ohm open. Raw |Z| goes from 469.9 ohm at 3 Hz down to 1.53 ohm at 48 kHz (median 185.4 ohm). The phase reaches -89.48 deg, with a median of -66.33 deg, so the open is dominated by stray capacitance. The low-frequency value of 469.9 ohm recurs exactly in later opens, which suggests a ceiling or clamp rather than a true reading. Usable as a 100 ohm shunt open reference, with that caveat.","exclude_reason":null,"confidence":0.85,"zat":[null,[468.302,-4.283],[382.1,-32.56],[68.2998,-80.51],[7.61424,-88.94]],"z1k":68.2998,"spark":[2.672,2.672,2.672,2.67,2.668,2.665,2.65,2.636,2.609,2.529,2.449,2.313,2.152,1.984,1.798,1.612,1.444,1.282,1.121,0.934,0.743,0.555,0.37,0.185],"stats":{"zmax":469.906,"zmin":1.53037,"ph_min":-89.4783,"f_ph_min":17454.5,"f_peak":230.769,"zi_peak":218.769,"r_lo":469.817,"r_hi":0.272818}},{"file_id":192,"path":"opencal_20260919_005031_eis.csv","filename":"opencal_20260919_005031_eis.csv","mtime":1789800000.0,"saved_at":"2026-09-19 00:51","kind":"eis","board":"pcm1808","n_points":11,"f_lo_hz":3.00619,"f_hi_hz":514.18,"fs_hz":96000.0,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":2140.7,"median_phase_raw_deg":-14.2852,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"Open-circuit calibration sweep on the wenner4 fixture. It is the first pcm1808 run in the archive, with a 470 ohm shunt and an 11-point stepped sweep from 3 Hz to 514 Hz. Raw |Z| goes from 2209 ohm at the low end to 636.0 ohm at the top (median 2141 ohm). The median phase is -14.29 deg and the minimum -73.27 deg, a capacitive open signature. It is the only 470 ohm shunt open on the new board, since later opencals that night switched to 100 ohm. Reasonable open reference for the pcm1808 at 470 ohm only.","exclude_reason":null,"confidence":0.85,"zat":[null,[2203.55,-3.901],[1809.83,-34.87],null,null],"z1k":null,"spark":[3.344,3.344,3.344,3.344,3.344,3.343,3.343,3.343,3.341,3.34,3.337,3.333,3.325,3.315,3.299,3.274,3.247,3.212,3.177,3.129,3.057,2.981,2.892,2.803],"stats":{"zmax":2208.58,"zmin":635.971,"ph_min":-73.2677,"f_ph_min":514.18,"f_peak":195.625,"zi_peak":1087.99,"r_lo":2208.16,"r_hi":183.096}},{"file_id":138,"path":"csv_archive/probablysaltyasfsoil_eis.csv","filename":"probablysaltyasfsoil_eis.csv","mtime":1788820000.0,"saved_at":"2026-09-07 18:33","kind":"eis","board":"ads1256","n_points":10,"f_lo_hz":0.898737,"f_hi_hz":5001.14,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":1,"open_applied":1,"array_type":"dipole2","median_zmag_raw":6808.19,"median_phase_raw_deg":-18.1717,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"probably salty as f","summary":"Soil the owner believed to be very salty, on the dipole2 fixture, ads1256 board, 470 ohm shunt. Raw |Z| falls from 15500 ohm at 0.9 Hz to 4467 ohm at 5 kHz (median 6808 ohm). The median phase is -18.17 deg with a minimum of -32.75 deg, and the negative phase growing toward low frequency is typical of soil and electrode polarisation. It is the last run of the 2026-09-07 session, after the 2200 ohm resistor. All points resolved. Usable qualitative soil data from the old rig.","exclude_reason":null,"confidence":0.75,"zat":[[18987.6,-30.44],[8191.23,-38.77],[2862.57,-46.0],[1168.64,-38.2],null],"z1k":1168.64,"spark":[4.294,4.24,4.187,4.132,4.07,4.009,3.942,3.874,3.804,3.727,3.649,3.574,3.499,3.424,3.352,3.279,3.215,3.157,3.099,3.055,3.01,2.977,2.954,2.931],"stats":{"zmax":19661.4,"zmin":852.252,"ph_min":-46.3597,"f_ph_min":292.285,"f_peak":0.898737,"zi_peak":9887.48,"r_lo":16994.4,"r_hi":756.975}},{"file_id":45,"path":"csv_archive/2200ohms_eis.csv","filename":"2200ohms_eis.csv","mtime":1788820000.0,"saved_at":"2026-09-07 18:30","kind":"eis","board":"ads1256","n_points":10,"f_lo_hz":0.898729,"f_hi_hz":5000.89,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":1,"open_applied":1,"array_type":"dipole2","median_zmag_raw":5527.55,"median_phase_raw_deg":1.83955,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"resistor","condition":null,"summary":"A 2200 ohm resistor on the dipole2 fixture, ads1256 board, 470 ohm shunt, with the calibration and open correction active. Raw |Z| goes from 5454 ohm at the low end to 12800 ohm at 5 kHz, with a median of 5528 ohm. The median phase is 1.84 deg (rising to 48.14 deg at the top), which fits a resistor with the board's high-frequency artefact. It repeats test2200ohms from 18:06 (median 6230 ohm) with reasonable agreement. All points resolved. Clear identification, but not a calibration standard because it is on the ads1256 board.","exclude_reason":"board ads1256 (original rig, incompatible calibration)","confidence":0.85,"zat":[[2856.38,0.2964],[2815.63,0.0006323],[2803.85,-0.2299],[2784.47,-1.104],null],"z1k":2784.47,"spark":[3.456,3.454,3.452,3.451,3.451,3.451,3.45,3.449,3.447,3.447,3.448,3.448,3.448,3.448,3.446,3.444,3.444,3.446,3.447,3.444,3.441,3.461,3.502,3.543],"stats":{"zmax":3494.15,"zmin":2747.98,"ph_min":-1.50602,"f_ph_min":1941.35,"f_peak":1941.35,"zi_peak":72.2224,"r_lo":2860.42,"r_hi":3476.07}},{"file_id":142,"path":"csv_archive/saltwatertest_eis.csv","filename":"saltwatertest_eis.csv","mtime":1788820000.0,"saved_at":"2026-09-07 18:25","kind":"eis","board":"ads1256","n_points":10,"f_lo_hz":0.899136,"f_hi_hz":5354.29,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":1,"open_applied":1,"array_type":"dipole2","median_zmag_raw":8984.97,"median_phase_raw_deg":-15.1538,"frac_open":0.0,"temp_c":null,"medium_tag":"air","notes_tag":"","category":"water","condition":"salty","summary":"Salt water on the dipole2 fixture, ads1256 board, 470 ohm shunt, with the calibration and open correction active. Raw |Z| goes from 16400 ohm at 0.9 Hz to 9931 ohm at 5.4 kHz (median 8985 ohm), and the median phase is -15.15 deg. That closely matches saltwaterstart and fits electrode polarisation in an electrolyte. The medium tag 'air' is stale from the preceding open runs, and the filename and data both say salt water. All points resolved. Decent qualitative water data from the old rig.","exclude_reason":null,"confidence":0.75,"zat":[[22071.0,-36.77],[8306.67,-38.13],[3262.15,-35.74],[1789.99,-17.03],null],"z1k":1789.99,"spark":[4.363,4.294,4.224,4.154,4.084,4.014,3.945,3.876,3.807,3.737,3.667,3.603,3.542,3.481,3.425,3.369,3.325,3.291,3.257,3.249,3.241,3.261,3.308,3.354],"stats":{"zmax":23090.9,"zmin":1726.77,"ph_min":-38.1888,"f_ph_min":17.3834,"f_peak":0.899136,"zi_peak":13793.0,"r_lo":18518.7,"r_hi":2259.75}},{"file_id":137,"path":"csv_archive/opentest_eis.csv","filename":"opentest_eis.csv","mtime":1788820000.0,"saved_at":"2026-09-07 18:24","kind":"eis","board":"ads1256","n_points":10,"f_lo_hz":0.898874,"f_hi_hz":5357.43,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":1,"open_applied":1,"array_type":"dipole2","median_zmag_raw":22162.7,"median_phase_raw_deg":2.17525,"frac_open":0.0,"temp_c":null,"medium_tag":"air","notes_tag":"","category":"open","condition":null,"summary":"An open-circuit check run on the dipole2 fixture, ads1256 board, 470 ohm shunt, saved with both the calibration and the open correction active. That makes it a test of the opencal just taken, not a reference. The raw features match the opencal sweeps: 21490 ohm at the low end, 60760 ohm at the high end, median 22160 ohm, median phase 2.175 deg. The array type changed to dipole2, but the data is unchanged. Fine as a record of the open-correction check on the old rig.","exclude_reason":null,"confidence":0.85,"zat":[[1652620.0,49.21],[11411300.0,54.96],[8519700.0,-72.51],[6740800.0,-146.3],null],"z1k":6740800.0,"spark":[6.188,6.294,6.399,6.582,6.986,7.389,7.214,6.796,6.451,6.482,6.512,6.654,6.842,7.023,6.841,6.66,6.613,6.666,6.725,6.911,7.096,6.522,5.258,3.993],"stats":{"zmax":32224400.0,"zmin":9851.17,"ph_min":-163.903,"f_ph_min":305.915,"f_peak":6.64928,"zi_peak":18139400.0,"r_lo":670065.0,"r_hi":-9057.33}},{"file_id":136,"path":"csv_archive/opencal_20260907_182159_eis.csv","filename":"opencal_20260907_182159_eis.csv","mtime":1788820000.0,"saved_at":"2026-09-07 18:22","kind":"eis","board":"ads1256","n_points":10,"f_lo_hz":0.898326,"f_hi_hz":5357.74,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":22116.2,"median_phase_raw_deg":2.19912,"frac_open":0.0,"temp_c":null,"medium_tag":"air","notes_tag":"","category":"open","condition":null,"summary":"Open-circuit calibration sweep on the wenner4 fixture, ads1256 board, 470 ohm shunt, tagged air. It is the last of three opencal captures on 2026-09-07. Raw |Z| goes from 21550 ohm to 60750 ohm (median 22120 ohm), with a median phase of 2.199 deg, which matches the earlier air and opencal runs. It was presumably the open correction that the next run (opentest) applied. Reliable for the ads1256 rig only.","exclude_reason":null,"confidence":0.9,"zat":[[21607.2,-0.3065],[22081.6,0.2847],[22120.9,2.809],[25652.3,24.05],null],"z1k":25652.3,"spark":[4.333,4.337,4.342,4.344,4.344,4.344,4.344,4.344,4.344,4.344,4.344,4.345,4.345,4.345,4.348,4.35,4.358,4.369,4.382,4.43,4.479,4.56,4.672,4.784],"stats":{"zmax":60752.7,"zmin":21550.4,"ph_min":-0.323853,"f_ph_min":0.898326,"f_peak":0.898326,"zi_peak":121.809,"r_lo":21550.1,"r_hi":36871.9}},{"file_id":135,"path":"csv_archive/opencal_20260907_182059_eis.csv","filename":"opencal_20260907_182059_eis.csv","mtime":1788820000.0,"saved_at":"2026-09-07 18:21","kind":"eis","board":"ads1256","n_points":10,"f_lo_hz":0.898622,"f_hi_hz":5357.73,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":22111.0,"median_phase_raw_deg":2.153,"frac_open":0.0,"temp_c":null,"medium_tag":"air","notes_tag":"","category":"open","condition":null,"summary":"Open-circuit calibration sweep on the wenner4 fixture, ads1256 board, 470 ohm shunt, tagged air. It is the second of three opencal captures on 2026-09-07. Raw |Z| goes from 21490 ohm to 60590 ohm (median 22110 ohm), with a median phase of 2.153 deg. It is essentially identical to its neighbours, and all 10 points resolved. Reliable as an open reference for the old rig only.","exclude_reason":null,"confidence":0.9,"zat":[[21541.6,-0.5864],[22087.5,0.2903],[22115.6,2.738],[25631.6,24.07],null],"z1k":25631.6,"spark":[4.332,4.336,4.34,4.343,4.343,4.344,4.344,4.344,4.344,4.344,4.344,4.344,4.345,4.345,4.347,4.35,4.357,4.369,4.382,4.43,4.478,4.56,4.671,4.782],"stats":{"zmax":60586.4,"zmin":21489.2,"ph_min":-0.633188,"f_ph_min":0.898622,"f_peak":0.898622,"zi_peak":237.477,"r_lo":21487.9,"r_hi":36791.5}},{"file_id":134,"path":"csv_archive/opencal_20260907_181946_eis.csv","filename":"opencal_20260907_181946_eis.csv","mtime":1788820000.0,"saved_at":"2026-09-07 18:20","kind":"eis","board":"ads1256","n_points":10,"f_lo_hz":0.898398,"f_hi_hz":5357.32,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":22124.5,"median_phase_raw_deg":2.21395,"frac_open":0.0,"temp_c":null,"medium_tag":"air","notes_tag":"","category":"open","condition":null,"summary":"Open-circuit calibration sweep on the wenner4 fixture, ads1256 board, 470 ohm shunt, tagged air. Raw |Z| goes from 21540 ohm at the low end to 61070 ohm at 5.4 kHz, with a median of 22120 ohm and a median phase of 2.214 deg. That is the same ceiling-level signature as the preceding open-air runs. It is the first of three opencal captures between 18:19 and 18:22 on 2026-09-07. A good ads1256 open reference.","exclude_reason":null,"confidence":0.9,"zat":[[21579.4,-0.6046],[22075.5,0.3047],[22130.7,2.834],[25684.9,24.12],null],"z1k":25684.9,"spark":[4.333,4.336,4.339,4.341,4.342,4.343,4.344,4.344,4.345,4.345,4.345,4.345,4.345,4.345,4.348,4.351,4.358,4.37,4.383,4.431,4.479,4.561,4.674,4.786],"stats":{"zmax":61070.8,"zmin":21541.1,"ph_min":-0.643554,"f_ph_min":0.898398,"f_peak":0.898398,"zi_peak":241.947,"r_lo":21539.7,"r_hi":37098.4}},{"file_id":95,"path":"csv_archive/openairtestmoretime_eis.csv","filename":"openairtestmoretime_eis.csv","mtime":1788820000.0,"saved_at":"2026-09-07 18:19","kind":"eis","board":"ads1256","n_points":10,"f_lo_hz":0.898855,"f_hi_hz":5357.82,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":22114.8,"median_phase_raw_deg":2.18783,"frac_open":0.0,"temp_c":null,"medium_tag":"air","notes_tag":"","category":"open","condition":null,"summary":"Probes in open air on the wenner4 fixture, ads1256 board, 470 ohm shunt. This is a third air repeat, apparently with a longer integration time ('moretime'). Raw |Z| goes from 21510 ohm to 60580 ohm (median 22110 ohm), and the median phase is 2.188 deg. It agrees with the two earlier air runs within about 1%, so the extra time changed nothing. All points resolved. Reliable open record for the old rig.","exclude_reason":null,"confidence":0.9,"zat":[[8429.27,-0.6427],[8450.58,0.03062],[8420.2,0.265],[8593.96,2.883],null],"z1k":8593.96,"spark":[3.926,3.926,3.927,3.928,3.928,3.929,3.928,3.926,3.924,3.924,3.925,3.925,3.925,3.925,3.924,3.923,3.924,3.927,3.931,3.937,3.943,3.953,3.966,3.978],"stats":{"zmax":9507.01,"zmin":8367.39,"ph_min":-0.702802,"f_ph_min":0.898855,"f_peak":0.898855,"zi_peak":103.347,"r_lo":8424.92,"r_hi":9483.46}},{"file_id":94,"path":"csv_archive/openairtest_eis.csv","filename":"openairtest_eis.csv","mtime":1788820000.0,"saved_at":"2026-09-07 18:16","kind":"eis","board":"ads1256","n_points":10,"f_lo_hz":0.856279,"f_hi_hz":5357.81,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":22124.8,"median_phase_raw_deg":2.12406,"frac_open":0.0,"temp_c":null,"medium_tag":"air","notes_tag":"","category":"open","condition":null,"summary":"Probes in open air on the wenner4 fixture, ads1256 board, 470 ohm shunt, a repeat of openair_eis one minute later. Raw |Z| is 21570 ohm at the low end and 60930 ohm at the high end, with a median of 22120 ohm and a median phase of 2.124 deg. That matches the previous run almost exactly, so this ceiling-level open is repeatable. All 10 points resolved. Reliable as an ads1256 open-air record, but irrelevant to the pcm1808 calibration.","exclude_reason":null,"confidence":0.9,"zat":[[8456.97,-0.4164],[8450.01,0.03514],[8416.08,0.164],[8614.02,2.93],null],"z1k":8614.02,"spark":[3.927,3.928,3.929,3.93,3.929,3.929,3.928,3.926,3.924,3.925,3.925,3.925,3.925,3.925,3.924,3.924,3.925,3.928,3.931,3.938,3.944,3.954,3.967,3.981],"stats":{"zmax":9562.03,"zmin":8378.69,"ph_min":-0.446097,"f_ph_min":0.856279,"f_peak":0.856279,"zi_peak":65.7806,"r_lo":8448.55,"r_hi":9538.09}},{"file_id":92,"path":"csv_archive/openair_eis.csv","filename":"openair_eis.csv","mtime":1788820000.0,"saved_at":"2026-09-07 18:15","kind":"eis","board":"ads1256","n_points":10,"f_lo_hz":0.856134,"f_hi_hz":5358.21,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":22148.1,"median_phase_raw_deg":2.18211,"frac_open":0.0,"temp_c":null,"medium_tag":"air","notes_tag":"","category":"open","condition":null,"summary":"The probes held in open air on the Wenner array with the 1000 ohm shunt, multitone, 100 points, at the end of the salt water session. The 'air' tag agrees with the name. Oddly, raw |Z| is very low for an open circuit: 10.41 ohm at 4 Hz, 22.45 ohm at 46.8 kHz, median 11.62 ohm, and only 1% of points are flagged unresolved. The phase wanders from -21.44 to 10.73 deg. These low readings probably reflect the front end folding above its ceiling rather than a real low impedance. Fine as a record of an open condition, not as a quantitative open calibration.","exclude_reason":null,"confidence":0.7,"zat":[[8433.97,-0.06957],[8467.48,0.0341],[8422.43,0.2537],[8601.38,2.86],null],"z1k":8601.38,"spark":[3.926,3.926,3.925,3.924,3.927,3.929,3.929,3.927,3.925,3.925,3.926,3.926,3.925,3.925,3.924,3.923,3.924,3.928,3.931,3.937,3.944,3.954,3.966,3.979],"stats":{"zmax":9520.77,"zmin":8371.71,"ph_min":-0.363809,"f_ph_min":2.53062,"f_peak":2.53062,"zi_peak":53.3207,"r_lo":8440.09,"r_hi":9497.63}},{"file_id":154,"path":"csv_archive/test_eis.csv","filename":"test_eis.csv","mtime":1788820000.0,"saved_at":"2026-09-07 18:09","kind":"eis","board":"ads1256","n_points":10,"f_lo_hz":0.855509,"f_hi_hz":5358.23,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":1,"open_applied":0,"array_type":"dipole2","median_zmag_raw":8279.22,"median_phase_raw_deg":-15.3223,"frac_open":0.0,"temp_c":null,"medium_tag":"resistor","notes_tag":"470ohm","category":"resistor","condition":null,"summary":"Probably a 470 ohm resistor, measured with the Wenner 4-rod setting on the experimental picoadc board with a 5000 ohm shunt. Only the GUI tags (medium 'resistor', notes '470ohm') say so; the filename is just 'test'. Raw |Z| goes from 246.1 to 457.1 ohm (median 386.6), and the phase runs from 3.524 to 44.6 deg (median 8.852 deg). That shape is hard to tell apart from the soil runs before and after it in this session. It was saved between the wet-soil and base-soil runs, and the previous file had no tags, so a stale tag is unlikely but the data does not clearly confirm a resistor. Treat the value as tentative. Not usable as a calibration standard.","exclude_reason":"Value comes only from notes_tag '470ohm'; the filename is a bare 'test'. Phase reaches 44.6 deg (median 8.852), and the raw |Z| curve (246.1 to 457.1 ohm) looks like the soil runs around it. Experimental picoadc board.","confidence":0.5,"zat":[[6131.03,-11.72],[4123.25,-20.23],[2271.54,-25.66],[1426.54,-13.11],null],"z1k":1426.54,"spark":[3.797,3.774,3.75,3.726,3.697,3.668,3.633,3.595,3.556,3.514,3.472,3.427,3.381,3.334,3.292,3.249,3.214,3.186,3.158,3.152,3.146,3.146,3.15,3.154],"stats":{"zmax":6268.73,"zmin":1391.71,"ph_min":-25.7849,"f_ph_min":119.279,"f_peak":6.58153,"zi_peak":1452.05,"r_lo":6147.64,"r_hi":1421.31}},{"file_id":147,"path":"csv_archive/test2200ohms_eis.csv","filename":"test2200ohms_eis.csv","mtime":1788820000.0,"saved_at":"2026-09-07 18:06","kind":"eis","board":"ads1256","n_points":10,"f_lo_hz":0.85828,"f_hi_hz":5358.03,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":1,"open_applied":0,"array_type":"dipole2","median_zmag_raw":6229.61,"median_phase_raw_deg":2.18341,"frac_open":0.0,"temp_c":null,"medium_tag":"water","notes_tag":"","category":"resistor","condition":null,"summary":"A 2200 ohm resistor on the dipole2 fixture, ads1256 board, 470 ohm shunt. Raw |Z| goes from 7937 ohm at the low end to 13980 ohm at 5.4 kHz, with a median of 6230 ohm. The median phase is 2.183 deg, which fits a resistor, though the phase swings from -12.91 to +48.76 deg at the band edges. The medium tag 'water' is left over from the salt-water runs just before, and the filename and near-zero phase say resistor. It was repeated at 18:30 as 2200ohms_eis (median 5528 ohm). Not a standard because it is on the ads1256 board.","exclude_reason":"board ads1256; stale medium_tag 'water'; phase spans -12.91 to 48.76 deg","confidence":0.8,"zat":[[3038.95,-11.32],[2331.22,0.01203],[2191.27,0.1928],[2184.8,0.00806],null],"z1k":2184.8,"spark":[3.493,3.468,3.443,3.42,3.405,3.39,3.374,3.36,3.346,3.346,3.346,3.345,3.342,3.339,3.339,3.338,3.338,3.339,3.34,3.339,3.337,3.337,3.339,3.341],"stats":{"zmax":3109.11,"zmin":2169.88,"ph_min":-12.9605,"f_ph_min":0.85828,"f_peak":0.85828,"zi_peak":697.309,"r_lo":3029.91,"r_hi":2194.09}},{"file_id":141,"path":"csv_archive/saltwaterstart_eis.csv","filename":"saltwaterstart_eis.csv","mtime":1788820000.0,"saved_at":"2026-09-07 17:48","kind":"eis","board":"ads1256","n_points":25,"f_lo_hz":0.855596,"f_hi_hz":5357.62,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":1,"open_applied":0,"array_type":"dipole2","median_zmag_raw":7964.24,"median_phase_raw_deg":-15.2454,"frac_open":0.0,"temp_c":null,"medium_tag":"water","notes_tag":"tds432, 1.1kohm-cm, 880uS/cm cond","category":"water","condition":"salty; TDS 432, 1.1 kohm-cm, 880 uS/cm","summary":"Salt water on the dipole2 fixture, ads1256 board, 470 ohm shunt. The note records TDS 432 and 880 uS/cm. Raw |Z| is 16920 ohm at 0.86 Hz and 9271 ohm at 5.4 kHz, with a median of 7964 ohm. The median phase is -15.25 deg and the range is -25.03 to +42.44 deg. The negative phase that grows at low frequency is consistent with electrode polarisation in an electrolyte. All 25 points resolved. Despite the 'start' in the name, it was saved after 'saltwatermore', and its numbers are closely matched by the later test_eis and saltwatertest runs. Reasonable qualitative water data from the old rig.","exclude_reason":null,"confidence":0.8,"zat":[[5712.24,-8.946],[3984.22,-19.47],[2165.84,-26.52],[1335.78,-11.3],null],"z1k":1335.78,"spark":[3.763,3.748,3.732,3.705,3.681,3.65,3.617,3.581,3.543,3.501,3.457,3.411,3.361,3.314,3.27,3.226,3.186,3.153,3.132,3.124,3.129,3.142,3.156,3.162],"stats":{"zmax":5797.53,"zmin":1327.27,"ph_min":-26.5354,"f_ph_min":104.759,"f_peak":11.9478,"zi_peak":1330.84,"r_lo":5738.96,"r_hi":1449.87}},{"file_id":140,"path":"csv_archive/saltwatermore_eis.csv","filename":"saltwatermore_eis.csv","mtime":1788820000.0,"saved_at":"2026-09-07 17:45","kind":"eis","board":"ads1256","n_points":2,"f_lo_hz":3369.37,"f_hi_hz":4819.27,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":1,"open_applied":0,"array_type":"dipole2","median_zmag_raw":0.0,"median_phase_raw_deg":90.0,"frac_open":1.0,"temp_c":null,"medium_tag":"water","notes_tag":"Tds of 432, 1.1kohm-cm, cond of 880uS/cm.","category":"water","condition":"salty (more salt); TDS 432, 1.1 kohm-cm, 880 uS/cm","summary":"Salt water on the dipole2 fixture, ads1256 board. The note records TDS 432, 1.1 kohm-cm and 880 uS/cm. Only 2 points were captured (3.4 to 4.8 kHz), both unresolved (frac_open 1.0), so raw |Z| reads 0 and the phase values of 0/180 deg mean nothing. Oddly, it was saved three minutes before 'saltwaterstart', which carries the same note, so the names may be out of order. There is no usable data. Keep it only as a record that the attempt was made.","exclude_reason":null,"confidence":0.5,"zat":[null,null,null,null,null],"z1k":null,"spark":null,"stats":{"zmax":0.0,"zmin":0.0,"ph_min":0.0,"f_ph_min":3369.37,"f_peak":3369.37,"zi_peak":0.0,"r_lo":0.0,"r_hi":0.0}},{"file_id":159,"path":"csv_archive/testhighimpedancewater_eis.csv","filename":"testhighimpedancewater_eis.csv","mtime":1788790000.0,"saved_at":"2026-09-07 10:21","kind":"eis","board":"ads1256","n_points":14,"f_lo_hz":297.92,"f_hi_hz":5358.0,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":1,"open_applied":0,"array_type":"dipole2","median_zmag_raw":31760.4,"median_phase_raw_deg":23.0611,"frac_open":0.0714286,"temp_c":null,"medium_tag":"waterdistilled","notes_tag":"","category":"water","condition":"distilled, high impedance","summary":"High-impedance distilled water on the dipole2 fixture, ads1256 board, 470 ohm shunt. The tag reads waterdistilled. The 14-point sweep only covers 298 Hz to 5.4 kHz. Raw |Z| rises from 28580 ohm to 58950 ohm (median 31760 ohm), so it is again at or above the ceiling. The median phase is +23.06 deg, which is unusual for water and probably an artefact of saturation rather than real inductance. 1 of 14 points was unresolved. It repeats the previous day's distilled-water test. Treat it as qualitative only.","exclude_reason":null,"confidence":0.75,"zat":[null,null,null,[6947.03,4.296],null],"z1k":6947.03,"spark":[3.835,3.835,3.835,3.836,3.836,3.836,3.837,3.838,3.839,3.84,3.841,3.843,3.845,3.848,3.851,3.855,3.859,3.864,3.87,3.876,3.882,3.888,3.894,3.9],"stats":{"zmax":7945.6,"zmin":6837.43,"ph_min":1.42498,"f_ph_min":297.92,"f_peak":297.92,"zi_peak":-170.033,"r_lo":6835.32,"r_hi":7880.88}},{"file_id":158,"path":"csv_archive/testdistilledwater_eis.csv","filename":"testdistilledwater_eis.csv","mtime":1788740000.0,"saved_at":"2026-09-06 18:56","kind":"eis","board":"ads1256","n_points":50,"f_lo_hz":0.929546,"f_hi_hz":6000.0,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":1,"open_applied":0,"array_type":"dipole2","median_zmag_raw":27676.4,"median_phase_raw_deg":0.896848,"frac_open":0.26,"temp_c":null,"medium_tag":"water","notes_tag":"","category":"water","condition":"distilled","summary":"Distilled water on the dipole2 fixture, ads1256 board, 470 ohm shunt. The medium tag says water. Raw |Z| is flat, 27600 ohm at the low end and 27150 ohm at the high end, with a median of 27680 ohm. The median phase is 0.8968 deg. That flat, near-resistive reading sits at the board's ceiling, as you would expect for very low-conductivity water. 26% of the 50 points were unresolved (frac_open 0.26). The run tells you the water is above the measurable range rather than giving a real spectrum, so trust it only as qualitative.","exclude_reason":null,"confidence":0.8,"zat":[[69064.4,-1.042],[66987.9,-0.6584],[66544.9,0.5415],null,null],"z1k":null,"spark":[4.84,4.837,4.838,4.829,4.835,4.828,4.827,4.827,4.827,4.826,4.826,4.824,4.824,4.823,4.822,4.822,4.822,4.822,4.828,4.822,4.821,4.83,4.821,4.811],"stats":{"zmax":69384.9,"zmin":64676.8,"ph_min":-2.24982,"f_ph_min":348.085,"f_peak":348.085,"zi_peak":2539.0,"r_lo":69209.5,"r_hi":64626.9}},{"file_id":148,"path":"csv_archive/test268kohms_eis.csv","filename":"test268kohms_eis.csv","mtime":1788660000.0,"saved_at":"2026-09-05 20:50","kind":"eis","board":"ads1256","n_points":13,"f_lo_hz":0.855665,"f_hi_hz":6000.0,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":1,"open_applied":0,"array_type":"dipole2","median_zmag_raw":28213.1,"median_phase_raw_deg":2.62656,"frac_open":0.0769231,"temp_c":null,"medium_tag":"","notes_tag":"","category":"resistor","condition":null,"summary":"A resistor labelled 268 kohm, measured on the dipole2 fixture with the ads1256 board and 470 ohm shunt. Raw |Z| goes from 27150 ohm to 44020 ohm, with a median of 28210 ohm. That is virtually identical to the 68k run two minutes earlier, which means both are pinned at the ceiling and the data cannot confirm the value. The median phase of 2.627 deg fits a resistor, and 1 of 13 points was unresolved. 268k is not a standard part value, so it may be a typo or two parts in series. Not a calibration standard, because of the board and the uncertain value.","exclude_reason":"board ads1256; '268kohms' is an unusual (non-E-series) value and may be a typo; reads 28210 median, same as the 68k ceiling","confidence":0.6,"zat":[[69141.1,0.3978],[67941.3,-0.009094],[67898.5,0.0439],[67653.1,-0.07005],null],"z1k":67653.1,"spark":[4.84,4.839,4.839,4.838,4.838,4.836,4.833,4.832,4.833,4.833,4.833,4.833,4.832,4.832,4.832,4.832,4.831,4.831,4.831,4.831,4.83,4.83,4.831,4.831],"stats":{"zmax":69178.4,"zmin":67595.2,"ph_min":-0.396638,"f_ph_min":4.15903,"f_peak":4.15903,"zi_peak":475.788,"r_lo":69175.3,"r_hi":67774.0}},{"file_id":153,"path":"csv_archive/test68kohms_eis.csv","filename":"test68kohms_eis.csv","mtime":1788660000.0,"saved_at":"2026-09-05 20:48","kind":"eis","board":"ads1256","n_points":24,"f_lo_hz":0.0791665,"f_hi_hz":6000.0,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":28181.1,"median_phase_raw_deg":3.32522,"frac_open":0.0416667,"temp_c":null,"medium_tag":"","notes_tag":"","category":"resistor","condition":null,"summary":"A 68 kohm resistor on the wenner4 fixture, ads1256 board, 470 ohm shunt. Raw |Z| is 21980 ohm at 0.079 Hz and 51860 ohm at 6 kHz, with a median of 28180 ohm. That is near this board's saturation ceiling, so the gap to 68000 is expected. The median phase is 3.325 deg, which fits a resistor, though it reaches 45.35 deg at one end. One of 24 points did not resolve (frac_open 0.042). The 268k run two minutes later reads nearly the same median, consistent with both sitting at the ceiling. The identification is fine, but the run is not usable as a standard because it is on the ads1256 board.","exclude_reason":"board ads1256 (original rig, incompatible calibration); also cal_applied=1","confidence":0.85,"zat":[[68371.1,0.02099],[68025.4,-0.03237],[68215.2,0.07763],[67989.0,0.01498],null],"z1k":67989.0,"spark":[4.831,4.84,4.846,4.836,4.832,4.834,4.835,4.834,4.833,4.832,4.833,4.833,4.833,4.833,4.833,4.834,4.832,4.832,4.833,4.833,4.832,4.832,4.833,4.834],"stats":{"zmax":70495.9,"zmin":67748.8,"ph_min":-6.36696,"f_ph_min":0.184381,"f_peak":0.184381,"zi_peak":7817.71,"r_lo":67748.7,"r_hi":68173.1}},{"file_id":160,"path":"csv_archive/testing_eis.csv","filename":"testing_eis.csv","mtime":1788570000.0,"saved_at":"2026-09-04 20:57","kind":"eis","board":"ads1256","n_points":6,"f_lo_hz":887.322,"f_hi_hz":5299.36,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":1007.25,"median_phase_raw_deg":-52.6156,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"test","condition":null,"summary":"A short 6-point test sweep (887 Hz to 5.3 kHz) on the ads1256 board with a 470 ohm shunt, taken right after the three opencal runs on 2026-09-04. Raw |Z| drops from 2014 ohm to 675.0 ohm and the median phase is -52.62 deg. The high-frequency end matches the preceding open sweeps (about 674 ohm), so the terminals were probably still open. The name says nothing about the device, so this is filed as a generic test. Low trust.","exclude_reason":null,"confidence":0.5,"zat":[null,null,null,[1816.73,-69.42],null],"z1k":1816.73,"spark":[3.304,3.275,3.246,3.217,3.188,3.16,3.134,3.107,3.081,3.055,3.033,3.011,2.99,2.968,2.948,2.932,2.916,2.9,2.884,2.871,2.861,2.85,2.84,2.829],"stats":{"zmax":2014.27,"zmin":675.037,"ph_min":-71.4891,"f_ph_min":887.322,"f_peak":887.322,"zi_peak":1910.06,"r_lo":639.502,"r_hi":592.814}},{"file_id":133,"path":"csv_archive/opencal_20260904_205229_eis.csv","filename":"opencal_20260904_205229_eis.csv","mtime":1788570000.0,"saved_at":"2026-09-04 20:54","kind":"eis","board":"ads1256","n_points":25,"f_lo_hz":0.855426,"f_hi_hz":5295.2,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":22638.9,"median_phase_raw_deg":-57.2882,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"Open-circuit calibration sweep on the wenner4 fixture, ads1256 board, 470 ohm shunt. It is the third and last of the 2026-09-04 opencal repeats. Raw |Z| runs from 140800 ohm near 0.86 Hz to 674.5 ohm at 5.3 kHz, with a median phase of -57.29 deg and a minimum of -81.87 deg. That is consistent with stray capacitance across an open. It matches the two earlier sweeps within a fraction of a percent, and all points resolved. It is reliable as an open reference for the ads1256 rig only.","exclude_reason":null,"confidence":0.9,"zat":[[140958.0,-0.8871],[106284.0,-40.5],[16667.9,-80.48],[1814.63,-69.38],null],"z1k":1814.63,"spark":[5.149,5.15,5.147,5.142,5.13,5.104,5.06,4.988,4.886,4.759,4.615,4.461,4.302,4.149,3.984,3.822,3.661,3.503,3.349,3.203,3.072,2.963,2.882,2.829],"stats":{"zmax":141319.0,"zmin":674.55,"ph_min":-81.867,"f_ph_min":212.659,"f_peak":11.9623,"zi_peak":70200.6,"r_lo":140810.0,"r_hi":592.319}},{"file_id":132,"path":"csv_archive/opencal_20260904_204937_eis.csv","filename":"opencal_20260904_204937_eis.csv","mtime":1788570000.0,"saved_at":"2026-09-04 20:51","kind":"eis","board":"ads1256","n_points":25,"f_lo_hz":0.856655,"f_hi_hz":5300.24,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":22608.3,"median_phase_raw_deg":-57.2625,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"Open-circuit calibration sweep on the wenner4 fixture, ads1256 board, 470 ohm shunt. It is the second of three back-to-back opencal runs on 2026-09-04. Raw |Z| goes from 140300 ohm at the low end to 674.4 ohm at 5.3 kHz, with a median phase of -57.26 deg, which is capacitive as expected for an open. It is almost indistinguishable from the 20:45 and 20:52 sweeps, so the open was repeatable. No unresolved points. This is a good open reference for the old rig only.","exclude_reason":null,"confidence":0.9,"zat":[[140596.0,-1.017],[106170.0,-40.52],[16626.2,-80.49],[1813.28,-69.36],null],"z1k":1813.28,"spark":[5.147,5.149,5.151,5.143,5.13,5.104,5.059,4.987,4.884,4.757,4.615,4.462,4.301,4.147,3.983,3.821,3.66,3.501,3.348,3.202,3.072,2.962,2.882,2.829],"stats":{"zmax":141664.0,"zmin":674.4,"ph_min":-81.8516,"f_ph_min":212.661,"f_peak":11.9525,"zi_peak":70093.7,"r_lo":140347.0,"r_hi":592.422}},{"file_id":131,"path":"csv_archive/opencal_20260904_204514_eis.csv","filename":"opencal_20260904_204514_eis.csv","mtime":1788570000.0,"saved_at":"2026-09-04 20:47","kind":"eis","board":"ads1256","n_points":25,"f_lo_hz":0.856844,"f_hi_hz":5299.72,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":22559.1,"median_phase_raw_deg":-57.234,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"Open-circuit calibration sweep on the wenner4 fixture, recorded on the old ads1256 board with a 470 ohm shunt. Raw |Z| falls steeply from 141000 ohm at 0.86 Hz to 674.3 ohm at 5.3 kHz, and the median phase is -57.23 deg (minimum -81.97 deg). That is what an open with stray capacitance looks like. All 25 points resolved. It is the first of three nearly identical opencal sweeps taken within ten minutes on 2026-09-04. It is a sound ads1256 open reference, but it cannot be used with the pcm1808 calibration.","exclude_reason":null,"confidence":0.9,"zat":[[141060.0,-0.3294],[106078.0,-40.54],[16598.6,-80.48],[1810.62,-69.33],null],"z1k":1810.62,"spark":[5.149,5.15,5.149,5.142,5.131,5.104,5.06,4.986,4.883,4.756,4.613,4.46,4.3,4.146,3.982,3.82,3.659,3.501,3.347,3.202,3.071,2.962,2.881,2.829],"stats":{"zmax":141249.0,"zmin":674.27,"ph_min":-81.9723,"f_ph_min":148.84,"f_peak":11.9523,"zi_peak":70023.7,"r_lo":140962.0,"r_hi":592.501}},{"file_id":130,"path":"csv_archive/opencal_20260904_204124_eis.csv","filename":"opencal_20260904_204124_eis.csv","mtime":1788570000.0,"saved_at":"2026-09-04 20:42","kind":"eis","board":"ads1256","n_points":12,"f_lo_hz":1.02613,"f_hi_hz":5299.99,"fs_hz":null,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":35510.3,"median_phase_raw_deg":-69.6864,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"The third 4 September open-circuit calibration sweep, ads1256 rig, wenner4, 680 ohm shunt, 12 points from 1.03 Hz to 5.3 kHz. Raw |Z| at the low end rises to 685300 ohm, up from about 204000 in the two earlier runs, while the top stays at 972.6. Median phase is more capacitive at -69.69 deg. No unresolved points. It is closer to a true open than the earlier two, perhaps after cleaning or drying the fixture, but still well below the August open levels. Moderate trust.","exclude_reason":null,"confidence":0.6,"zat":[null,[221499.0,-70.82],[23528.4,-85.31],[2615.27,-69.78],null],"z1k":2615.27,"spark":[5.836,5.807,5.776,5.696,5.616,5.49,5.361,5.213,5.061,4.905,4.747,4.586,4.423,4.265,4.11,3.954,3.796,3.641,3.493,3.351,3.232,3.117,3.053,2.988],"stats":{"zmax":685317.0,"zmin":972.574,"ph_min":-85.3733,"f_ph_min":104.877,"f_peak":4.6408,"zi_peak":329928.0,"r_lo":673042.0,"r_hi":855.196}},{"file_id":129,"path":"csv_archive/opencal_20260904_203308_eis.csv","filename":"opencal_20260904_203308_eis.csv","mtime":1788570000.0,"saved_at":"2026-09-04 20:33","kind":"eis","board":"ads1256","n_points":12,"f_lo_hz":1.0268,"f_hi_hz":5299.99,"fs_hz":null,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":34800.3,"median_phase_raw_deg":-55.6744,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"A short 12-point open-circuit calibration sweep, ads1256 rig, wenner4, 680 ohm shunt, 1.03 Hz to 5.3 kHz. Raw |Z| is 204200 ohm at the low end and 975.6 at the top (median 34800), nearly identical to the run five minutes earlier. Median phase is -55.67 deg. No unresolved points. It is repeatable, but the magnitude is much lower than the earlier open-air runs (tens of MOhm), so the 'open' may include leakage. The second of three opencal runs; moderate trust.","exclude_reason":null,"confidence":0.6,"zat":[null,[153995.0,-40.81],[23368.5,-80.5],[2629.1,-69.08],null],"z1k":2629.1,"spark":[5.31,5.309,5.307,5.295,5.282,5.239,5.193,5.101,5.0,4.871,4.731,4.579,4.42,4.263,4.109,3.955,3.8,3.646,3.497,3.353,3.234,3.12,3.054,2.989],"stats":{"zmax":204222.0,"zmin":975.563,"ph_min":-81.6874,"f_ph_min":234.538,"f_peak":10.1327,"zi_peak":100944.0,"r_lo":204217.0,"r_hi":857.747}},{"file_id":128,"path":"csv_archive/opencal_20260904_202819_eis.csv","filename":"opencal_20260904_202819_eis.csv","mtime":1788570000.0,"saved_at":"2026-09-04 20:32","kind":"eis","board":"ads1256","n_points":55,"f_lo_hz":0.927087,"f_hi_hz":5300.25,"fs_hz":null,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":32505.0,"median_phase_raw_deg":-59.5296,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"An open-circuit calibration sweep, ads1256 rig, wenner4, 680 ohm shunt, 55 points from 0.93 Hz to 5.3 kHz. Raw |Z| is 203000 ohm at the low end and 975.6 at the top (median 32510), with a capacitive median phase of -59.53 deg. That is far below the tens of MOhm seen in the 17 August open runs, and the top end resembles the ~850-960 ohm level of the plant runs. Possible leakage or rods not fully in air. No unresolved points. The first of three opencal runs that evening; moderate trust.","exclude_reason":null,"confidence":0.6,"zat":[[204122.0,-0.7455],[153929.0,-40.86],[24069.9,-80.49],[2607.48,-69.41],null],"z1k":2607.48,"spark":[5.308,5.309,5.31,5.302,5.288,5.258,5.209,5.132,5.027,4.897,4.754,4.604,4.45,4.282,4.127,3.967,3.808,3.651,3.499,3.356,3.227,3.119,3.041,2.989],"stats":{"zmax":204762.0,"zmin":975.551,"ph_min":-82.0275,"f_ph_min":188.738,"f_peak":10.6205,"zi_peak":101396.0,"r_lo":203046.0,"r_hi":857.701}},{"file_id":183,"path":"csv_archive/tropicalplant150mlwater_eis.csv","filename":"tropicalplant150mlwater_eis.csv","mtime":1788550000.0,"saved_at":"2026-09-04 14:41","kind":"eis","board":"ads1256","n_points":55,"f_lo_hz":0.952538,"f_hi_hz":5299.69,"fs_hz":null,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":1,"open_applied":0,"array_type":"dipole2","median_zmag_raw":1811.74,"median_phase_raw_deg":-7.50496,"frac_open":0.0,"temp_c":null,"medium_tag":"plantsoil","notes_tag":"","category":"plant","condition":"+150 ml water","summary":"Tropical plant soil at the 150 ml water step, the last of the series, dipole2, ads1256 rig, 680 ohm shunt, 55 points. Raw |Z| is 2434 ohm at the low end and 851.5 at the top, only slightly below 2764 at 100 ml, so the pot is near saturation. Median phase is -7.505 deg, essentially unchanged. No unresolved points. A trustworthy wet endpoint of the watering series.","exclude_reason":null,"confidence":0.85,"zat":[[2329.41,-8.614],[2029.73,10.45],[5309.62,62.86],[36134.1,49.72],null],"z1k":36134.1,"spark":[3.37,3.357,3.344,3.327,3.267,3.31,3.307,3.313,3.333,3.375,3.447,3.547,3.67,3.807,3.952,4.101,4.242,4.378,4.499,4.6,4.675,4.723,4.753,4.77],"stats":{"zmax":58902.3,"zmin":1767.14,"ph_min":-8.95687,"f_ph_min":0.952538,"f_peak":0.952538,"zi_peak":365.159,"r_lo":2316.81,"r_hi":56989.0}},{"file_id":181,"path":"csv_archive/tropicalplant100mlwater_eis.csv","filename":"tropicalplant100mlwater_eis.csv","mtime":1788550000.0,"saved_at":"2026-09-04 14:34","kind":"eis","board":"ads1256","n_points":55,"f_lo_hz":0.937534,"f_hi_hz":5294.9,"fs_hz":null,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":1,"open_applied":0,"array_type":"dipole2","median_zmag_raw":2106.27,"median_phase_raw_deg":-6.90856,"frac_open":0.0,"temp_c":null,"medium_tag":"plantsoil","notes_tag":"","category":"plant","condition":"+100 ml water","summary":"Tropical plant soil at the 100 ml water step, dipole2, ads1256 rig, 680 ohm shunt, 55 points from 0.94 Hz to 5.3 kHz. Raw |Z| is 2764 ohm at the low end and 871.6 at the top (median 2106), well below the 50 ml step. Median phase is -6.909 deg (minimum -25.24), almost resistive. No unresolved points. This is the fourth watering step. A trustworthy record.","exclude_reason":null,"confidence":0.85,"zat":[[2644.49,-7.633],[2337.56,10.66],[6139.96,62.04],[39801.0,45.8],null],"z1k":39801.0,"spark":[3.425,3.415,3.403,3.387,3.378,3.371,3.368,3.374,3.395,3.437,3.508,3.608,3.73,3.867,4.012,4.16,4.299,4.431,4.545,4.637,4.702,4.742,4.767,4.78],"stats":{"zmax":60279.7,"zmin":2333.3,"ph_min":-8.01834,"f_ph_min":0.937534,"f_peak":0.937534,"zi_peak":371.495,"r_lo":2637.2,"r_hi":58838.7}},{"file_id":185,"path":"csv_archive/tropicalplant50mlwater_eis.csv","filename":"tropicalplant50mlwater_eis.csv","mtime":1788550000.0,"saved_at":"2026-09-04 14:28","kind":"eis","board":"ads1256","n_points":55,"f_lo_hz":0.937934,"f_hi_hz":5299.41,"fs_hz":null,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":1,"open_applied":0,"array_type":"dipole2","median_zmag_raw":3970.1,"median_phase_raw_deg":-9.41573,"frac_open":0.0,"temp_c":null,"medium_tag":"plantsoil","notes_tag":"","category":"plant","condition":"+50 ml water","summary":"Tropical plant soil at the 50 ml water step, dipole2, ads1256 rig, 680 ohm shunt, 55 points. Raw |Z| at the low end roughly halves to 5034 ohm from 9677 at 20 ml, and the top is 924.9. Median phase is -9.416 deg (range -40.02 to -5.539), clearly moving toward resistive behaviour as the soil wets. No unresolved points. This is the third watering step. A trustworthy record.","exclude_reason":null,"confidence":0.85,"zat":[[4840.81,-6.401],[4431.57,10.25],[11520.4,57.18],[53574.3,29.15],null],"z1k":53574.3,"spark":[3.686,3.678,3.672,3.66,3.652,3.647,3.646,3.653,3.673,3.716,3.786,3.884,4.005,4.137,4.275,4.409,4.527,4.626,4.699,4.747,4.776,4.792,4.801,4.806],"stats":{"zmax":63978.3,"zmin":4422.3,"ph_min":-6.48009,"f_ph_min":0.937934,"f_peak":0.937934,"zi_peak":547.395,"r_lo":4819.31,"r_hi":63557.9}},{"file_id":184,"path":"csv_archive/tropicalplant20mlwater_eis.csv","filename":"tropicalplant20mlwater_eis.csv","mtime":1788550000.0,"saved_at":"2026-09-04 14:18","kind":"eis","board":"ads1256","n_points":55,"f_lo_hz":0.925579,"f_hi_hz":5300.05,"fs_hz":null,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":1,"open_applied":0,"array_type":"dipole2","median_zmag_raw":7662.97,"median_phase_raw_deg":-15.9346,"frac_open":0.0,"temp_c":null,"medium_tag":"plantsoil","notes_tag":"","category":"plant","condition":"+20 ml water","summary":"Tropical plant soil at the 20 ml water step, dipole2, ads1256 rig, 680 ohm shunt, 55 points from 0.93 Hz to 5.3 kHz. Raw |Z| is 9677 ohm at the low end and 950.2 at the top, a modest fall from 10870 at 10 ml. Median phase is -15.93 deg (range -52.34 to -4.645). No unresolved points. This is the second watering step, monotonic with its neighbours. A trustworthy record.","exclude_reason":null,"confidence":0.85,"zat":[[9309.08,-4.716],[8791.85,9.931],[21784.7,48.7],[61725.4,15.96],null],"z1k":61725.4,"spark":[3.97,3.964,3.962,3.952,3.947,3.943,3.943,3.95,3.97,4.011,4.079,4.172,4.284,4.402,4.517,4.615,4.693,4.746,4.779,4.797,4.808,4.812,4.816,4.818],"stats":{"zmax":65736.7,"zmin":8767.82,"ph_min":-4.94222,"f_ph_min":0.925579,"f_peak":0.925579,"zi_peak":803.242,"r_lo":9288.97,"r_hi":65620.2}},{"file_id":182,"path":"csv_archive/tropicalplant10mlwater_eis.csv","filename":"tropicalplant10mlwater_eis.csv","mtime":1788550000.0,"saved_at":"2026-09-04 14:12","kind":"eis","board":"ads1256","n_points":55,"f_lo_hz":0.932993,"f_hi_hz":5295.0,"fs_hz":null,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":1,"open_applied":0,"array_type":"dipole2","median_zmag_raw":8454.2,"median_phase_raw_deg":-17.6679,"frac_open":0.0,"temp_c":null,"medium_tag":"plantsoil","notes_tag":"10ml bottled water added","category":"plant","condition":"+10 ml bottled water","summary":"Tropical plant soil after adding 10 ml water (the note says bottled), dipole2, ads1256 rig, 680 ohm shunt, 55 points. Raw |Z| at the low end drops to 10870 ohm from the 17650 baseline, and the top is 953.5. Median phase moves to -17.67 deg, less capacitive. No unresolved points. The name, tag and note all agree. This is the first watering step of the series. A trustworthy record.","exclude_reason":null,"confidence":0.85,"zat":[[10429.4,-5.186],[9804.43,9.395],[23847.3,46.61],[62446.2,14.3],null],"z1k":62446.2,"spark":[4.02,4.012,4.009,3.999,3.994,3.991,3.99,3.998,4.018,4.058,4.125,4.217,4.326,4.44,4.551,4.642,4.711,4.758,4.785,4.801,4.81,4.814,4.817,4.819],"stats":{"zmax":65942.6,"zmin":9772.93,"ph_min":-5.33994,"f_ph_min":0.932993,"f_peak":0.932993,"zi_peak":974.485,"r_lo":10425.6,"r_hi":65850.2}},{"file_id":89,"path":"csv_archive/icctropical_eis.csv","filename":"icctropical_eis.csv","mtime":1788550000.0,"saved_at":"2026-09-04 13:59","kind":"eis","board":"ads1256","n_points":55,"f_lo_hz":0.937928,"f_hi_hz":5300.14,"fs_hz":null,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":1,"open_applied":0,"array_type":"dipole2","median_zmag_raw":12485.5,"median_phase_raw_deg":-26.419,"frac_open":0.0,"temp_c":null,"medium_tag":"plantsoil","notes_tag":"","category":"plant","condition":"before watering","summary":"The soil of a potted tropical plant (tag plantsoil), two-rod dipole fixture, ads1256 rig, 680 ohm shunt, 55 points from 0.94 Hz to 5.3 kHz. Raw |Z| falls from 17650 ohm at the low end to 961.2 at the top (median 12490). Phase stays negative (median -26.42 deg), typical of fairly dry soil with electrode polarisation. No unresolved points. This is the baseline before the 10 to 150 ml watering series that follows. 'icc' is not decoded. A trustworthy plant-soil record.","exclude_reason":null,"confidence":0.75,"zat":[[16969.0,-6.41],[15719.3,6.478],[34048.9,36.3],[64311.7,8.759],null],"z1k":64311.7,"spark":[4.231,4.226,4.221,4.211,4.204,4.198,4.196,4.201,4.218,4.253,4.314,4.395,4.491,4.581,4.663,4.721,4.763,4.789,4.803,4.812,4.816,4.819,4.821,4.823],"stats":{"zmax":66491.3,"zmin":15686.6,"ph_min":-6.41805,"f_ph_min":0.937928,"f_peak":0.937928,"zi_peak":1901.12,"r_lo":16900.8,"r_hi":66454.0}},{"file_id":156,"path":"csv_archive/testbig_eis.csv","filename":"testbig_eis.csv","mtime":1788500000.0,"saved_at":"2026-09-03 23:34","kind":"eis","board":"ads1256","n_points":196,"f_lo_hz":0.0790504,"f_hi_hz":6000.0,"fs_hz":null,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":2493.84,"median_phase_raw_deg":-22.6781,"frac_open":0.0153061,"temp_c":null,"medium_tag":"soil","notes_tag":"","category":"soil","condition":null,"summary":"A long soil sweep, ads1256 rig, wenner4, 680 ohm shunt, 196 points from 0.079 Hz to 6 kHz. Raw |Z| is 877.4 ohm at the low end and 46.28 at the top, but the median of 2494 is higher than either end, so the middle of the band is lumpy. Phase spans -100.6 to +98.89 deg (median -22.68), so some points are noisy. Only 1.5% were unresolved. This is the fullest sweep of the test session after test2. A usable but noisy soil record.","exclude_reason":null,"confidence":0.65,"zat":[[3565.75,17.16],[4090.36,14.11],[12290.7,34.94],[13710.7,-29.91],null],"z1k":13710.7,"spark":[3.182,3.292,3.394,3.463,3.519,3.548,3.565,3.586,3.599,3.604,3.611,3.634,3.698,3.816,3.97,4.111,4.183,4.24,4.237,4.186,4.093,3.969,3.828,3.665],"stats":{"zmax":17617.2,"zmin":1520.41,"ph_min":-46.7733,"f_ph_min":3856.28,"f_peak":1223.21,"zi_peak":7034.11,"r_lo":-35.694,"r_hi":3335.34}},{"file_id":149,"path":"csv_archive/test2_eis.csv","filename":"test2_eis.csv","mtime":1788500000.0,"saved_at":"2026-09-03 23:15","kind":"eis","board":"ads1256","n_points":10,"f_lo_hz":4.96613,"f_hi_hz":6000.0,"fs_hz":null,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":876.169,"median_phase_raw_deg":-33.6117,"frac_open":0.1,"temp_c":null,"medium_tag":"soil","notes_tag":"","category":"soil","condition":null,"summary":"Another soil test, ads1256 rig, wenner4, now with a 680 ohm shunt instead of 68, 10 points from 4.97 Hz to 6 kHz. Raw |Z| is 1003 ohm at the low end and 49.09 at the top (median 876.2). That is much higher than the 68 ohm shunt runs, as expected when the raw scale changes with the shunt. Phase is negative throughout (median -33.61 deg), fitting soil. 10% of points were unresolved. A quick check after the shunt change; the tag says soil.","exclude_reason":null,"confidence":0.65,"zat":[null,[1475.35,9.884],[3969.32,37.22],[5784.38,-17.44],null],"z1k":5784.38,"spark":[3.179,3.175,3.171,3.17,3.186,3.202,3.23,3.294,3.358,3.431,3.517,3.604,3.675,3.724,3.774,3.8,3.811,3.821,3.802,3.772,3.742,3.693,3.64,3.587],"stats":{"zmax":6667.3,"zmin":1470.97,"ph_min":-33.954,"f_ph_min":2733.25,"f_peak":2733.25,"zi_peak":2157.53,"r_lo":1506.85,"r_hi":3204.22}},{"file_id":155,"path":"csv_archive/testagain_eis.csv","filename":"testagain_eis.csv","mtime":1788500000.0,"saved_at":"2026-09-03 23:11","kind":"eis","board":"ads1256","n_points":8,"f_lo_hz":0.897007,"f_hi_hz":6000.0,"fs_hz":null,"r_shunt_ohm":68.0,"shunts":"68","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":99.5548,"median_phase_raw_deg":-10.9769,"frac_open":0.125,"temp_c":null,"medium_tag":"soil","notes_tag":"","category":"soil","condition":null,"summary":"A repeat of the test1 soil sweep, ads1256 rig, wenner4, 68 ohm shunt, only 8 points from 0.90 Hz to 6 kHz. Raw |Z| is 108.7 ohm at the low end and 8.3 ohm at the top (median 99.55), somewhat lower than test1's 173. Median phase is -10.98 deg (minimum -89.31), and 12.5% of points were unresolved. The medium tag says soil and the data agree. Too coarse for more than a quick repeatability check.","exclude_reason":null,"confidence":0.65,"zat":[[161.381,16.63],[159.632,10.1],[397.879,35.42],[572.994,-17.64],null],"z1k":572.994,"spark":[2.207,2.21,2.214,2.218,2.222,2.216,2.211,2.205,2.207,2.248,2.288,2.329,2.389,2.48,2.57,2.66,2.722,2.76,2.799,2.837,2.814,2.772,2.73,2.689],"stats":{"zmax":701.365,"zmin":158.61,"ph_min":-30.1876,"f_ph_min":1730.96,"f_peak":1730.96,"zi_peak":245.575,"r_lo":153.27,"r_hi":422.15}},{"file_id":145,"path":"csv_archive/test1_eis.csv","filename":"test1_eis.csv","mtime":1788490000.0,"saved_at":"2026-09-03 23:09","kind":"eis","board":"ads1256","n_points":20,"f_lo_hz":0.880027,"f_hi_hz":6000.0,"fs_hz":null,"r_shunt_ohm":68.0,"shunts":"68","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":128.37,"median_phase_raw_deg":-21.1243,"frac_open":0.05,"temp_c":null,"medium_tag":"soil","notes_tag":"","category":"soil","condition":null,"summary":"A short soil test on the ads1256 rig with a wenner4 array and a 68 ohm shunt, 20 points from 0.88 Hz to 6 kHz. The medium tag says soil and the '1' is a run index, not a value. Raw |Z| falls from 173.0 ohm at the low end to 3.56 at the top (median 128.4). Phase reaches -93.49 deg (median -21.12), fitting soil with electrode polarisation. 5% of points were unresolved. This is the first of a short test session, followed by 'testagain'. A rough soil check.","exclude_reason":null,"confidence":0.65,"zat":[[254.848,5.771],[203.016,8.646],[541.426,31.85],[626.565,-24.73],null],"z1k":626.565,"spark":[2.41,2.4,2.387,2.369,2.346,2.325,2.312,2.311,2.327,2.37,2.442,2.534,2.634,2.733,2.801,2.856,2.885,2.886,2.864,2.815,2.753,2.682,2.602,2.514],"stats":{"zmax":779.974,"zmin":202.349,"ph_min":-39.3868,"f_ph_min":3795.19,"f_peak":1518.03,"zi_peak":274.355,"r_lo":255.016,"r_hi":252.615}},{"file_id":127,"path":"csv_archive/opencal_20260903_215727_eis.csv","filename":"opencal_20260903_215727_eis.csv","mtime":1788490000.0,"saved_at":"2026-09-03 21:59","kind":"eis","board":"ads1256","n_points":40,"f_lo_hz":0.927346,"f_hi_hz":6000.0,"fs_hz":null,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":0.294984,"median_phase_raw_deg":-37.7941,"frac_open":0.025,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"The last of five 3 September open-circuit calibration sweeps, ads1256 rig, 680 ohm shunt, 40 points from 0.93 Hz to 6 kHz. Raw |Z| is 0.189 ohm at the low end, 0.019 at the top, median 0.295, matching the two runs before it. Median phase is -37.79 deg and 2.5% of points were unresolved. The sub-ohm magnitude is inconsistent with an open circuit, which reads tens of MOhm on this rig. Labelled open from the name, with low trust.","exclude_reason":null,"confidence":0.45,"zat":[[0.190534,20.97],[0.654306,21.46],[0.576969,-54.69],[0.0755539,-75.54],null],"z1k":0.0755539,"spark":[-0.724,-0.72,-0.659,-0.54,-0.393,-0.327,-0.201,-0.161,-0.099,-0.071,-0.062,-0.074,-0.212,-0.261,-0.365,-0.505,-0.649,-0.809,-0.989,-1.155,-1.299,-1.444,-1.605,-1.721],"stats":{"zmax":0.873613,"zmin":0.0189959,"ph_min":-77.4137,"f_ph_min":805.461,"f_peak":57.5059,"zi_peak":0.50883,"r_lo":0.177972,"r_hi":0.0140105}},{"file_id":126,"path":"csv_archive/opencal_20260903_215357_eis.csv","filename":"opencal_20260903_215357_eis.csv","mtime":1788490000.0,"saved_at":"2026-09-03 21:56","kind":"eis","board":"ads1256","n_points":40,"f_lo_hz":0.926557,"f_hi_hz":6000.0,"fs_hz":null,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":0.290332,"median_phase_raw_deg":-45.5584,"frac_open":0.025,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"The fourth 3 September open-circuit calibration sweep, ads1256 rig, 680 ohm shunt, 40 points from 0.93 Hz to 6 kHz. Raw |Z| is 0.1931 ohm at the low end, 0.01922 at the top, median 0.2903. That nearly duplicates the previous run, but sub-ohm values contradict a real open circuit. Median phase is -45.56 deg and 2.5% of points were unresolved. Repeatable, but probably affected by a channel or scaling problem. Low trust as an open reference.","exclude_reason":null,"confidence":0.45,"zat":[[0.18681,25.18],[0.601044,22.0],[0.58417,-55.28],[0.0762824,-74.38],null],"z1k":0.0762824,"spark":[-0.714,-0.704,-0.69,-0.559,-0.445,-0.31,-0.235,-0.184,-0.078,-0.052,-0.054,-0.065,-0.195,-0.266,-0.365,-0.508,-0.655,-0.819,-0.989,-1.156,-1.305,-1.441,-1.61,-1.716],"stats":{"zmax":0.912479,"zmin":0.0192161,"ph_min":-78.8808,"f_ph_min":805.453,"f_peak":56.7673,"zi_peak":0.544776,"r_lo":0.175506,"r_hi":0.0132651}},{"file_id":125,"path":"csv_archive/opencal_20260903_214847_eis.csv","filename":"opencal_20260903_214847_eis.csv","mtime":1788490000.0,"saved_at":"2026-09-03 21:51","kind":"eis","board":"ads1256","n_points":40,"f_lo_hz":0.928455,"f_hi_hz":6000.0,"fs_hz":null,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":0.295964,"median_phase_raw_deg":-43.0217,"frac_open":0.025,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"The third 3 September open-circuit calibration sweep, ads1256 rig, 680 ohm shunt, 40 points from 0.93 Hz to 6 kHz. Raw |Z| is again sub-ohm: 0.1678 at the low end, 0.01961 at the top, median 0.296. That is inconsistent with an open circuit. Phase is now steadier (median -43.02 deg), and only 2.5% of points were unresolved. The following two opencal runs repeat it almost exactly, so the result is repeatable but probably reflects a wiring or scaling issue. Low trust as an open reference.","exclude_reason":null,"confidence":0.45,"zat":[[0.181647,22.84],[0.58696,26.03],[0.578092,-53.87],[0.0743527,-74.08],null],"z1k":0.0743527,"spark":[-0.775,-0.644,-0.637,-0.555,-0.387,-0.289,-0.296,-0.166,-0.106,-0.072,-0.066,-0.1,-0.21,-0.276,-0.373,-0.508,-0.656,-0.826,-0.984,-1.161,-1.302,-1.454,-1.6,-1.708],"stats":{"zmax":0.886089,"zmin":0.019611,"ph_min":-78.7182,"f_ph_min":644.649,"f_peak":74.1181,"zi_peak":0.484229,"r_lo":0.153217,"r_hi":0.0124055}},{"file_id":124,"path":"csv_archive/opencal_20260903_214739_eis.csv","filename":"opencal_20260903_214739_eis.csv","mtime":1788490000.0,"saved_at":"2026-09-03 21:48","kind":"eis","board":"ads1256","n_points":13,"f_lo_hz":399.64,"f_hi_hz":5750.57,"fs_hz":null,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":0.0277746,"median_phase_raw_deg":78.3976,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"The second 3 September open-circuit calibration attempt, ads1256 rig, 680 ohm shunt, 13 points from 400 Hz to 5.75 kHz. Raw |Z| is tiny, 0.1334 ohm at the low end to 0.008014 ohm at the top (median 0.02777). This contradicts a true open circuit and suggests the load channel saw almost no voltage. Phase is erratic (-144.2 to +169.9, median 78.4 deg) even though no points are flagged unresolved. Labelled open from the name; treat the data as unreliable.","exclude_reason":null,"confidence":0.4,"zat":[null,null,null,[0.060502,-1.105],null],"z1k":0.060502,"spark":[-0.875,-1.338,-1.801,-1.501,-0.945,-1.004,-1.176,-1.222,-1.211,-1.13,-1.166,-1.253,-1.399,-1.67,-1.777,-1.708,-1.769,-2.024,-1.97,-1.586,-1.634,-1.723,-1.909,-2.096],"stats":{"zmax":0.138563,"zmin":0.00698745,"ph_min":-144.226,"f_ph_min":518.876,"f_peak":1915.61,"zi_peak":0.0141906,"r_lo":-0.131307,"r_hi":0.00358028}},{"file_id":123,"path":"csv_archive/opencal_20260903_214629_eis.csv","filename":"opencal_20260903_214629_eis.csv","mtime":1788490000.0,"saved_at":"2026-09-03 21:47","kind":"eis","board":"ads1256","n_points":17,"f_lo_hz":108.189,"f_hi_hz":6000.0,"fs_hz":null,"r_shunt_ohm":680.0,"shunts":"680","cal_applied":0,"open_applied":0,"array_type":"wenner4","median_zmag_raw":0.763284,"median_phase_raw_deg":102.291,"frac_open":0.705882,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"An open-circuit calibration attempt on the ads1256 rig, now with a 680 ohm shunt and wenner4 array, 17 points from 108 Hz to 6 kHz. Raw |Z| is only 0.3792 to 0.7633 ohm, the opposite of an open circuit, which should read tens of MOhm. That points to a disconnected load channel or a different scaling. Phase is erratic (median 102.3 deg) and 70.6% of points were unresolved. This is the first of five opencal runs that evening. Labelled open from the name only; the data is suspect.","exclude_reason":null,"confidence":0.4,"zat":[null,null,null,null,null],"z1k":null,"spark":[-0.421,-0.162,-0.114,-0.116,-0.118,-0.119,-0.121,-0.123,-0.125,-0.127,-0.128,-0.13,-0.132,-0.134,-0.136,-0.137,0.034,0.013,-0.009,-0.031,-0.052,-0.074,-0.096,-0.117],"stats":{"zmax":1.08487,"zmin":0.379193,"ph_min":-158.208,"f_ph_min":141.539,"f_peak":141.539,"zi_peak":0.2704,"r_lo":0.35773,"r_hi":-0.162481}},{"file_id":55,"path":"csv_archive/68kres_eis.csv","filename":"68kres_eis.csv","mtime":1788440000.0,"saved_at":"2026-09-03 07:00","kind":"eis","board":"ads1256","n_points":361,"f_lo_hz":0.0810817,"f_hi_hz":6000.0,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":1,"open_applied":0,"array_type":"wenner4","median_zmag_raw":14719.6,"median_phase_raw_deg":-51.6425,"frac_open":0.0166205,"temp_c":null,"medium_tag":"res68k","notes_tag":"","category":"resistor","condition":null,"summary":"A 68 kOhm resistor on the ads1256 rig, 470 ohm shunt, 361 points from 0.081 Hz to 6 kHz. The res68k tag agrees with the name; the wenner4 array tag is probably left over from earlier. Raw |Z| falls from 39290 ohm at the low end to 658.7 ohm at the top (median 14720). Phase reaches -76.63 deg (median -51.64), showing strong shunt capacitance across the large resistor. Only 1.7% of points were unresolved. The value is trustworthy, but it is not a standard: old board and capacitive phase.","exclude_reason":"ads1256 board; median raw phase -51.64 deg is strongly capacitive for a resistor","confidence":0.85,"zat":[[67667.5,-0.1112],[68031.4,-0.3158],[68477.8,0.04761],[68113.7,0.02741],null],"z1k":68113.7,"spark":[4.833,4.839,4.841,4.834,4.828,4.828,4.831,4.833,4.833,4.833,4.833,4.832,4.832,4.832,4.832,4.84,4.833,4.832,4.832,4.833,4.834,4.834,4.833,4.818],"stats":{"zmax":70592.5,"zmin":65818.6,"ph_min":-1.85683,"f_ph_min":0.301171,"f_peak":0.301171,"zi_peak":2210.88,"r_lo":68080.0,"r_hi":65793.1}},{"file_id":165,"path":"csv_archive/testopenair_eis.csv","filename":"testopenair_eis.csv","mtime":1787030000.0,"saved_at":"2026-08-17 23:38","kind":"eis","board":"ads1256","n_points":28,"f_lo_hz":0.101835,"f_hi_hz":6000.0,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":53881200.0,"median_phase_raw_deg":-34.8097,"frac_open":0.0357143,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"An open-air test on the ads1256 rig with the 470 ohm shunt, 28 points from 0.10 Hz to 6 kHz, calibration applied. Raw |Z| is 130.1 MOhm at the low end, falling to 1.069 MOhm at the top (median 53.88 MOhm). Median phase is -34.81 deg (range -89.1 to +20.73), consistent with stray capacitance in an open circuit. Only 3.6% of points were unresolved. This is the open check that follows the 100 ohm resistor run. A fair open-circuit record for this shunt.","exclude_reason":null,"confidence":0.8,"zat":[[56486500.0,-3.451],[51513100.0,-9.211],[26645600.0,-40.98],[2904980.0,-102.4],null],"z1k":2904980.0,"spark":[7.968,7.507,7.61,7.713,7.728,7.752,7.727,7.947,7.658,7.657,7.704,7.864,7.661,7.576,7.549,7.428,7.328,7.097,6.962,6.665,6.448,6.197,5.941,5.661],"stats":{"zmax":115942000.0,"zmin":458396.0,"ph_min":-117.144,"f_ph_min":4104.98,"f_peak":18.6409,"zi_peak":91804900.0,"r_lo":92933900.0,"r_hi":-209134.0}},{"file_id":31,"path":"csv_archive/100ohmsresistornewrodscalibrated_eis.csv","filename":"100ohmsresistornewrodscalibrated_eis.csv","mtime":1787030000.0,"saved_at":"2026-08-17 23:35","kind":"eis","board":"ads1256","n_points":28,"f_lo_hz":0.0789674,"f_hi_hz":6000.0,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":139.98,"median_phase_raw_deg":0.454218,"frac_open":0.0357143,"temp_c":null,"medium_tag":"","notes_tag":"","category":"resistor","condition":null,"summary":"A 100 ohm resistor on the new-rod fixture, ads1256 rig, 470 ohm shunt, 28 points from 0.079 Hz to 6 kHz. Raw |Z| is 140.0 ohm at the low end and median, rising to 233.4 at the top. Phase sits near zero (median 0.4542 deg) but reaches +40.55 deg at high frequency, probably lead inductance or front-end effects. Only 3.6% of points were unresolved. This is the successful re-run after the aborted 2-point attempt. Not a standard: old board, check run, high-frequency phase excursion.","exclude_reason":"ads1256 board; 'calibrated' in name marks a calibration check; phase reaches +40.55 deg at the high end","confidence":0.85,"zat":[[100.134,0.1775],[100.0,0.03941],[100.026,0.0337],[100.029,0.01955],null],"z1k":100.029,"spark":[2.0,2.001,2.001,1.988,1.996,2.001,2.0,2.0,2.0,2.0,2.0,2.0,2.0,2.0,2.0,2.0,2.0,2.0,2.001,2.0,2.0,2.0,2.0,2.0],"stats":{"zmax":100.688,"zmin":96.4081,"ph_min":-2.73704,"f_ph_min":0.37304,"f_peak":0.37304,"zi_peak":4.6037,"r_lo":99.951,"r_hi":100.097}},{"file_id":30,"path":"csv_archive/100ohmresistornewrodscalibrated_eis.csv","filename":"100ohmresistornewrodscalibrated_eis.csv","mtime":1787030000.0,"saved_at":"2026-08-17 23:31","kind":"eis","board":"ads1256","n_points":2,"f_lo_hz":5368.92,"f_hi_hz":6000.0,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":null,"median_phase_raw_deg":null,"frac_open":1.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"resistor","condition":null,"summary":"A 100 ohm resistor on the new-rod fixture, ads1256 rig, now with a 470 ohm shunt. Only 2 points (5.4 to 6 kHz) were saved and both were unresolved (frac_open 1.0), so there is no raw impedance. This is an aborted attempt. The run was repeated as '100ohmsresistornewrodscalibrated' four minutes later. Not usable and not a calibration standard.","exclude_reason":"aborted: only 2 points and frac_open 1.0; ads1256 board; 'calibrated' in name marks a check","confidence":0.6,"zat":[null,null,null,null,null],"z1k":null,"spark":null,"stats":{}},{"file_id":82,"path":"csv_archive/gclaydrynewrodscalibrated_eis.csv","filename":"gclaydrynewrodscalibrated_eis.csv","mtime":1787020000.0,"saved_at":"2026-08-17 22:29","kind":"eis","board":"ads1256","n_points":66,"f_lo_hz":0.0904189,"f_hi_hz":4997.89,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":10282300.0,"median_phase_raw_deg":-19.703,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"dry","summary":"Dry clay with the new rods and a calibration applied, ads1256 rig, 66 points from 0.09 Hz to 5 kHz. The name suggests it was a check of that calibration. Raw |Z| falls from 31.2 MOhm at the low end to 689.4 kOhm at the top (median 10.28 MOhm). Phase is negative throughout (-99.13 to -5.615, median -19.7 deg). No unresolved points, a cleaner result than the dryish run 50 minutes earlier. A reasonable dry-soil record with new rods.","exclude_reason":null,"confidence":0.75,"zat":[[15618300.0,-10.13],[13259700.0,-17.07],[9172960.0,-22.03],[3732010.0,-55.95],null],"z1k":3732010.0,"spark":[7.475,7.347,7.307,7.269,7.222,7.19,7.199,7.175,7.11,7.1,7.118,6.828,7.05,7.003,6.915,6.899,6.85,6.815,6.687,6.648,6.5,6.336,6.13,5.838],"stats":{"zmax":29836800.0,"zmin":689417.0,"ph_min":-99.1294,"f_ph_min":4997.89,"f_peak":1.85343,"zi_peak":6114380.0,"r_lo":29416100.0,"r_hi":-109386.0}},{"file_id":83,"path":"csv_archive/gclaynewrodsdryish_eis.csv","filename":"gclaynewrodsdryish_eis.csv","mtime":1787020000.0,"saved_at":"2026-08-17 21:40","kind":"eis","board":"ads1256","n_points":195,"f_lo_hz":0.0901695,"f_hi_hz":5000.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":9814030.0,"median_phase_raw_deg":-13.6939,"frac_open":0.307692,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"dryish","summary":"Dryish clay soil measured with the new rods, ads1256 rig, 100 ohm shunt, 195 points from 0.09 Hz to 5 kHz. Raw |Z| is very high: 20.77 MOhm at the low end and 5.175 MOhm at the top (median 9.814 MOhm). That is not far below the open-circuit runs, which suggests poor rod contact. Phase is mild (median -13.69 deg, range -39.74 to +7.085), and 30.8% of points were unresolved. The label fits, but the data is borderline usable.","exclude_reason":null,"confidence":0.7,"zat":[[13790800.0,-11.61],[10100400.0,-17.28],[8023180.0,-12.95],null,null],"z1k":null,"spark":[7.298,7.255,7.217,7.226,7.184,7.222,7.13,7.14,7.115,7.068,7.14,7.049,7.062,6.949,6.976,7.015,6.973,6.932,6.977,6.874,6.854,6.851,6.856,6.681],"stats":{"zmax":26937600.0,"zmin":4397300.0,"ph_min":-40.593,"f_ph_min":249.371,"f_peak":7.42886,"zi_peak":10304900.0,"r_lo":19746300.0,"r_hi":3740730.0}},{"file_id":122,"path":"csv_archive/opencal_20260817_211057_eis.csv","filename":"opencal_20260817_211057_eis.csv","mtime":1787020000.0,"saved_at":"2026-08-17 21:12","kind":"eis","board":"ads1256","n_points":50,"f_lo_hz":0.929929,"f_hi_hz":5000.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":39803100.0,"median_phase_raw_deg":3.99485,"frac_open":0.32,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"The fullest of the four 17 August open-circuit calibration sweeps, ads1256 rig, 100 ohm shunt, 50 points from 0.93 Hz to 5 kHz. Raw |Z| is 60.7 MOhm at the low end and 30.21 MOhm at the top (median 39.8 MOhm). Phase is scattered from -71.4 to +68.41 deg (median 3.995). 32% of points were unresolved. It agrees with the shorter attempts and the open-air runs. The best open reference of this session, but only for the old board.","exclude_reason":null,"confidence":0.8,"zat":[[45378000.0,-1.479],[38359200.0,4.351],[49545800.0,-10.06],null,null],"z1k":null,"spark":[7.783,7.848,7.67,7.671,7.42,7.373,7.569,7.6,7.549,7.863,7.491,7.772,7.592,7.726,7.596,7.666,7.815,7.568,7.714,7.737,7.927,7.47,7.481,7.48],"stats":{"zmax":110641000.0,"zmin":23411300.0,"ph_min":-71.3967,"f_ph_min":45.7891,"f_peak":45.7891,"zi_peak":69316000.0,"r_lo":60349200.0,"r_hi":21002900.0}},{"file_id":121,"path":"csv_archive/opencal_20260817_211000_eis.csv","filename":"opencal_20260817_211000_eis.csv","mtime":1787020000.0,"saved_at":"2026-08-17 21:10","kind":"eis","board":"ads1256","n_points":5,"f_lo_hz":0.795925,"f_hi_hz":5000.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":53483500.0,"median_phase_raw_deg":-6.21705,"frac_open":0.4,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"Another 5-point open-circuit calibration sweep on the ads1256 rig, 0.80 Hz to 5 kHz. Raw |Z| is 53.48 MOhm at the low end and 151.2 MOhm at the top (median 53.48 MOhm). The rise at high frequency reflects noise at very low current, not a real trend. Phase spans -42.33 to +4.566 deg, and 40% of points were unresolved. This is the third of four opencal attempts; the next one is a fuller 50-point sweep. A weak open reference.","exclude_reason":null,"confidence":0.75,"zat":[[51987900.0,3.52],[44660000.0,-9.252],null,null,null],"z1k":null,"spark":[7.728,7.718,7.707,7.697,7.686,7.676,7.665,7.655,7.644,7.633,7.623,7.612,7.602,7.651,7.704,7.757,7.81,7.863,7.915,7.968,8.021,8.074,8.127,8.18],"stats":{"zmax":151232000.0,"zmin":39932500.0,"ph_min":-42.3338,"f_ph_min":70.7107,"f_peak":70.7107,"zi_peak":101847000.0,"r_lo":53313700.0,"r_hi":111796000.0}},{"file_id":120,"path":"csv_archive/opencal_20260817_210937_eis.csv","filename":"opencal_20260817_210937_eis.csv","mtime":1787020000.0,"saved_at":"2026-08-17 21:09","kind":"eis","board":"ads1256","n_points":5,"f_lo_hz":0.8466,"f_hi_hz":5000.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":45750900.0,"median_phase_raw_deg":1.74562,"frac_open":0.4,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"A very short open-circuit calibration sweep on the ads1256 rig, 5 points from 0.85 Hz to 5 kHz. Raw |Z| is 76.55 MOhm at the low end and 23.75 MOhm at the top (median 45.75 MOhm). Phase stays between 1.64 and 17.81 deg. 40% of the 5 points were unresolved. This is the second of four opencal attempts in quick succession and is too sparse to rely on. It fits an open circuit, but its value as a reference is low.","exclude_reason":null,"confidence":0.75,"zat":[[73669600.0,2.943],[42638800.0,16.07],null,null,null],"z1k":null,"spark":[7.884,7.865,7.845,7.826,7.807,7.788,7.768,7.749,7.73,7.711,7.691,7.672,7.651,7.626,7.601,7.576,7.551,7.526,7.501,7.476,7.451,7.426,7.401,7.376],"stats":{"zmax":76551900.0,"zmin":23753800.0,"ph_min":1.6401,"f_ph_min":70.7107,"f_peak":70.7107,"zi_peak":-679862.0,"r_lo":76516400.0,"r_hi":23744100.0}},{"file_id":119,"path":"csv_archive/opencal_20260817_210844_eis.csv","filename":"opencal_20260817_210844_eis.csv","mtime":1787020000.0,"saved_at":"2026-08-17 21:09","kind":"eis","board":"ads1256","n_points":10,"f_lo_hz":0.831335,"f_hi_hz":5000.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":56444300.0,"median_phase_raw_deg":-18.5786,"frac_open":0.3,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"An open-circuit calibration sweep on the ads1256 rig, 100 ohm shunt, 10 points from 0.83 Hz to 5 kHz. Raw |Z| goes from 60.76 MOhm at the low end to 27.13 MOhm at the top (median 56.44 MOhm). Median phase is -18.58 deg, ranging -94.35 to +7.677. 30% of points were unresolved. This is the first of four opencal attempts within four minutes, and it agrees with the earlier open-air runs. A coarse open reference for the old board only.","exclude_reason":null,"confidence":0.8,"zat":[[54374600.0,-0.04108],[55372300.0,-15.27],[57182800.0,-26.29],null,null],"z1k":null,"spark":[7.784,7.72,7.657,7.593,7.53,7.508,7.554,7.6,7.645,7.69,7.733,7.777,7.82,7.819,7.811,7.804,7.796,7.787,7.776,7.765,7.754,7.663,7.548,7.434],"stats":{"zmax":66936400.0,"zmin":27133400.0,"ph_min":-94.3452,"f_ph_min":222.99,"f_peak":113.497,"zi_peak":28389900.0,"r_lo":60638500.0,"r_hi":-2055770.0}},{"file_id":67,"path":"csv_archive/capacitornewrods_eis.csv","filename":"capacitornewrods_eis.csv","mtime":1787020000.0,"saved_at":"2026-08-17 21:06","kind":"eis","board":"ads1256","n_points":105,"f_lo_hz":0.0998002,"f_hi_hz":5500.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":963.029,"median_phase_raw_deg":-83.3101,"frac_open":0.257143,"temp_c":null,"medium_tag":"","notes_tag":"","category":"capacitor","condition":null,"summary":"A capacitor of unstated value on the new-rod fixture, ads1256 rig, 100 ohm shunt, 105 points from 0.10 Hz to 5.5 kHz. Raw |Z| falls steeply from 114200 ohm at the low end to 56.63 ohm at the top (median 963). Median phase is -83.31 deg (range -87.26 to -34.72), clearly capacitive. 25.7% of points were unresolved. The label fits the data, but with no value in the name, nominal_farad is left empty.","exclude_reason":null,"confidence":0.75,"zat":[[15432.6,-83.13],[1618.52,-86.95],[168.578,-73.41],null,null],"z1k":null,"spark":[5.038,4.926,4.809,4.68,4.534,4.381,4.227,4.066,3.904,3.746,3.593,3.443,3.293,3.128,2.985,2.825,2.662,2.492,2.346,2.19,1.958,1.877,1.799,1.72],"stats":{"zmax":109210.0,"zmin":52.5407,"ph_min":-92.4296,"f_ph_min":18.5842,"f_peak":0.0998002,"zi_peak":73280.0,"r_lo":80974.2,"r_hi":43.664}},{"file_id":96,"path":"csv_archive/openairtestnewrodscalibrated_eis.csv","filename":"openairtestnewrodscalibrated_eis.csv","mtime":1787020000.0,"saved_at":"2026-08-17 20:30","kind":"eis","board":"ads1256","n_points":105,"f_lo_hz":0.0962335,"f_hi_hz":7000.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":51991600.0,"median_phase_raw_deg":-10.4098,"frac_open":0.342857,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"The new rods in open air with a calibration applied, ads1256 rig, 105 points from 0.096 Hz to 7 kHz. The name marks it as a check of the calibration. Raw |Z| is 58.9 MOhm at the low end and 75.51 MOhm at the top (median 51.99 MOhm). Phase is scattered from -171.4 to +109.4 deg, typical of an open circuit. 34% of points were unresolved. A noisy open-circuit check, not a reference.","exclude_reason":null,"confidence":0.75,"zat":[[50338900.0,13.34],[121884000.0,20.18],[44102300.0,-43.09],null,null],"z1k":null,"spark":[7.751,7.789,7.828,7.792,7.485,7.693,7.778,7.718,7.628,7.728,8.059,7.87,7.768,7.699,7.981,7.068,7.766,6.819,6.831,7.645,7.636,7.516,7.611,7.867],"stats":{"zmax":340809000.0,"zmin":1286280.0,"ph_min":-171.366,"f_ph_min":14.1724,"f_peak":2.70925,"zi_peak":96490500.0,"r_lo":55391200.0,"r_hi":72326700.0}},{"file_id":164,"path":"csv_archive/testnewrodsopenair_eis.csv","filename":"testnewrodsopenair_eis.csv","mtime":1787020000.0,"saved_at":"2026-08-17 20:20","kind":"eis","board":"ads1256","n_points":20,"f_lo_hz":0.943569,"f_hi_hz":7000.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":43553200.0,"median_phase_raw_deg":-5.88382,"frac_open":0.5,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"A test of the new rods in open air, ads1256 rig, 20 points from 0.94 Hz to 7 kHz, no calibration. Raw |Z| goes from 45.43 MOhm at the low end to 33.0 MOhm at the top (median 43.55 MOhm). Phase spans -58.32 to +35.81 deg. Half the points (frac_open 0.5) were unresolved, so this is a sparse open-circuit check. It agrees with the earlier open-air run's ~43 MOhm median. Treat it as a quick open check, not a reference.","exclude_reason":null,"confidence":0.75,"zat":[[42428900.0,-0.92],[46421700.0,-0.7156],[33186400.0,-58.1],null,null],"z1k":null,"spark":[7.638,7.601,7.564,7.554,7.585,7.534,7.406,7.359,7.367,7.4,7.521,7.642,7.678,7.702,7.807,7.98,8.154,8.047,7.877,7.764,7.699,7.634,7.569,7.504],"stats":{"zmax":153392000.0,"zmin":22597200.0,"ph_min":-58.7426,"f_ph_min":105.617,"f_peak":41.59,"zi_peak":46619400.0,"r_lo":43275200.0,"r_hi":16546900.0}},{"file_id":51,"path":"csv_archive/470ohmsknownresistornewrods_eis.csv","filename":"470ohmsknownresistornewrods_eis.csv","mtime":1787020000.0,"saved_at":"2026-08-17 20:18","kind":"eis","board":"ads1256","n_points":19,"f_lo_hz":0.10352,"f_hi_hz":7000.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":488.272,"median_phase_raw_deg":0.0254042,"frac_open":0.315789,"temp_c":null,"medium_tag":"","notes_tag":"","category":"resistor","condition":null,"summary":"A 470 ohm known resistor on the new-rod fixture, ads1256 rig, 100 ohm shunt, 19 points from 0.10 Hz to 7 kHz. Raw |Z| is very flat: 488.5 ohm at the low end, 487.6 at the top, median 488.3. Phase sits near 0 deg (median 0.025, max 3.634), a textbook resistor. 31.6% of points were unresolved, below the 0.5 limit. This is the good re-run after the aborted 2-point attempt. Clean data, but it cannot be a standard because it was taken on the old ads1256 board.","exclude_reason":"ads1256 board (incompatible calibration with current hardware)","confidence":0.92,"zat":[[467.07,0.01265],[467.843,-0.1257],[476.387,0.6131],null,null],"z1k":null,"spark":[2.669,2.669,2.669,2.669,2.669,2.669,2.669,2.669,2.669,2.67,2.67,2.67,2.67,2.67,2.67,2.652,2.635,2.662,2.676,2.673,2.678,2.678,2.677,2.677],"stats":{"zmax":476.745,"zmin":429.101,"ph_min":-0.13454,"f_ph_min":11.356,"f_peak":11.356,"zi_peak":1.09869,"r_lo":467.079,"r_hi":475.329}},{"file_id":50,"path":"csv_archive/470ohmknownresistornewrods_eis.csv","filename":"470ohmknownresistornewrods_eis.csv","mtime":1787020000.0,"saved_at":"2026-08-17 20:16","kind":"eis","board":"ads1256","n_points":2,"f_lo_hz":3891.28,"f_hi_hz":7000.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":null,"median_phase_raw_deg":null,"frac_open":1.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"resistor","condition":null,"summary":"A 470 ohm known resistor on the new-rod fixture, ads1256 rig, 100 ohm shunt. Only 2 points (3.9 to 7 kHz) were saved and both were unresolved (frac_open 1.0), so there are no raw impedance values. This looks like an aborted start. A full re-run ('470ohmsknownresistornewrods') was saved two minutes later. Not usable for anything except as a record of the attempt, and not a calibration standard.","exclude_reason":"aborted: only 2 points and frac_open 1.0; ads1256 board","confidence":0.6,"zat":[null,null,null,null,null],"z1k":null,"spark":null,"stats":{}},{"file_id":93,"path":"csv_archive/openairnewrodsnocal_eis.csv","filename":"openairnewrodsnocal_eis.csv","mtime":1787010000.0,"saved_at":"2026-08-17 19:10","kind":"eis","board":"ads1256","n_points":45,"f_lo_hz":0.0844754,"f_hi_hz":5003.41,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":43455500.0,"median_phase_raw_deg":-16.6644,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"The new rods in open air, uncalibrated, ads1256 rig, 45 points from 0.084 Hz to 5 kHz. Raw |Z| is 47.18 MOhm at the low end, falling to 717.5 kOhm at the top, with a median of 43.46 MOhm. Phase wanders from -166.4 to +46.75 deg, as expected when almost no current flows. No unresolved points. A reasonable open-circuit reference for the new-rod session on the old board.","exclude_reason":null,"confidence":0.85,"zat":[[62735100.0,5.684],[42689200.0,9.13],[91894600.0,-24.25],[8924490.0,-114.5],null],"z1k":8924490.0,"spark":[7.674,7.487,7.371,7.737,7.876,7.699,7.634,7.772,7.633,7.837,7.63,7.593,7.637,7.665,7.659,7.995,7.603,7.81,7.343,7.186,6.853,6.48,6.151,5.856],"stats":{"zmax":103843000.0,"zmin":717549.0,"ph_min":-166.377,"f_ph_min":0.206478,"f_peak":261.408,"zi_peak":72145400.0,"r_lo":45745100.0,"r_hi":-342988.0}},{"file_id":163,"path":"csv_archive/testnewrodsnocal_eis.csv","filename":"testnewrodsnocal_eis.csv","mtime":1787010000.0,"saved_at":"2026-08-17 18:50","kind":"eis","board":"ads1256","n_points":20,"f_lo_hz":79.5011,"f_hi_hz":5000.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":10475400.0,"median_phase_raw_deg":-46.1794,"frac_open":0.25,"temp_c":null,"medium_tag":"","notes_tag":"","category":"test","condition":null,"summary":"A repeat new-rod test without calibration on the ads1256 rig, 20 points from 79.5 Hz to 5 kHz. Raw |Z| is several MOhm (8.166 MOhm low, 4.446 MOhm high, median 10.48 MOhm). Phase is scattered from -174 to +127.5 deg, showing very little signal. 25% of points were unresolved. The magnitude suggests the rods were open or barely in contact. Useful only as a record of commissioning the new rods.","exclude_reason":null,"confidence":0.5,"zat":[null,null,[96465500.0,-67.79],null,null],"z1k":null,"spark":[6.912,7.293,7.082,7.01,7.377,7.859,7.586,7.312,7.036,7.141,7.116,6.982,6.949,6.917,6.884,6.579,6.818,7.058,7.298,7.418,7.226,7.033,6.841,6.648],"stats":{"zmax":107314000.0,"zmin":3679540.0,"ph_min":-174.028,"f_ph_min":254.177,"f_peak":99.1469,"zi_peak":100465000.0,"r_lo":-4976580.0,"r_hi":-4421520.0}},{"file_id":162,"path":"csv_archive/testnewrods_eis.csv","filename":"testnewrods_eis.csv","mtime":1787010000.0,"saved_at":"2026-08-17 18:43","kind":"eis","board":"ads1256","n_points":10,"f_lo_hz":0.869364,"f_hi_hz":7500.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":59743900.0,"median_phase_raw_deg":-2.97926,"frac_open":0.3,"temp_c":null,"medium_tag":"","notes_tag":"","category":"test","condition":null,"summary":"A first quick test of a new set of rods on the ads1256 rig, 10 points from 0.87 Hz to 7.5 kHz, no calibration. Raw |Z| is in the tens of MOhm (53.99 MOhm low, 33.13 MOhm high, median 59.74 MOhm) with median phase -2.979 deg. That matches the open-air runs made later the same evening, so the rods were probably not in any medium. 30% of points were unresolved. The name doesn't say what the rods were in; treat it as a rig test only.","exclude_reason":null,"confidence":0.5,"zat":[[56951100.0,2.752],[65869200.0,0.7538],[66364300.0,-48.2],null,null],"z1k":null,"spark":[7.732,7.777,7.821,7.866,7.91,7.9,7.884,7.867,7.846,7.821,7.797,7.772,7.797,7.83,7.862,7.895,7.881,7.846,7.811,7.776,7.712,7.648,7.584,7.52],"stats":{"zmax":82250200.0,"zmin":33131400.0,"ph_min":-94.414,"f_ph_min":415.209,"f_peak":142.171,"zi_peak":57159100.0,"r_lo":53915000.0,"r_hi":-2549880.0}},{"file_id":76,"path":"csv_archive/gclay16mlwater_eis.csv","filename":"gclay16mlwater_eis.csv","mtime":1786960000.0,"saved_at":"2026-08-17 05:21","kind":"eis","board":"ads1256","n_points":124,"f_lo_hz":0.0789499,"f_hi_hz":5248.78,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":13513.9,"median_phase_raw_deg":-21.0766,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"+16 ml water","summary":"Clay soil at the 16 ml water step, the last of the gclay watering series, ads1256 rig, 100 ohm shunt, 124 points. Raw |Z| goes from 19380 ohm at 0.08 Hz to 752.6 ohm at 5.25 kHz. That is only slightly below the 12 ml step's 21360, so the soil is close to saturation. Median phase is -21.08 deg, almost unchanged. No unresolved points. A trustworthy soil record and the wet endpoint of the series.","exclude_reason":null,"confidence":0.85,"zat":[[18449.3,-3.923],[16408.0,-5.844],[13910.5,1.164],[18831.0,7.702],null],"z1k":18831.0,"spark":[4.285,4.285,4.285,4.278,4.281,4.266,4.257,4.25,4.241,4.23,4.215,4.2,4.183,4.165,4.15,4.145,4.159,4.192,4.23,4.262,4.283,4.294,4.301,4.307],"stats":{"zmax":20288.7,"zmin":13906.1,"ph_min":-7.86982,"f_ph_min":1.49436,"f_peak":1.49436,"zi_peak":2463.26,"r_lo":19265.9,"r_hi":20239.0}},{"file_id":75,"path":"csv_archive/gclay12mlwater_eis.csv","filename":"gclay12mlwater_eis.csv","mtime":1786960000.0,"saved_at":"2026-08-17 04:49","kind":"eis","board":"ads1256","n_points":124,"f_lo_hz":0.079006,"f_hi_hz":5248.77,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":14512.4,"median_phase_raw_deg":-22.0549,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"+12 ml water","summary":"Clay soil at the 12 ml water step, ads1256 rig, 100 ohm shunt, 124 points from 0.08 Hz to 5.25 kHz. Low-frequency raw |Z| is 21360 ohm and the high end 752.1 ohm. Median phase is -22.05 deg (range -70.6 to +0.59). Both continue the trend from the 8 ml step. No unresolved points. This is the fifth step of the watering series. A trustworthy soil record.","exclude_reason":null,"confidence":0.85,"zat":[[20145.6,-4.486],[17739.2,-6.123],[14778.5,-0.2659],[18962.0,6.558],null],"z1k":18962.0,"spark":[4.327,4.33,4.331,4.32,4.322,4.306,4.288,4.285,4.275,4.264,4.249,4.234,4.216,4.197,4.18,4.171,4.181,4.207,4.239,4.267,4.285,4.295,4.301,4.307],"stats":{"zmax":21455.8,"zmin":14749.1,"ph_min":-6.28326,"f_ph_min":13.9159,"f_peak":8.37663,"zi_peak":1944.25,"r_lo":21233.3,"r_hi":20230.3}},{"file_id":80,"path":"csv_archive/gclay8mlwater_eis.csv","filename":"gclay8mlwater_eis.csv","mtime":1786960000.0,"saved_at":"2026-08-17 04:26","kind":"eis","board":"ads1256","n_points":124,"f_lo_hz":0.0791212,"f_hi_hz":5248.3,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":18458.6,"median_phase_raw_deg":-26.4027,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"+8 ml water","summary":"Clay soil at the 8 ml water step, ads1256 rig, 100 ohm shunt, 124 points. Raw |Z| goes from 28080 ohm at 0.08 Hz to 756.3 ohm at 5.25 kHz, continuing the steady fall from 33480 at 6 ml. Median phase is -26.4 deg (range -72.67 to +0.82). No unresolved points. This is the fourth step of the watering series. The change per ml is shrinking, which suggests the soil is nearing saturation. A trustworthy soil record.","exclude_reason":null,"confidence":0.85,"zat":[[26535.3,-4.012],[23403.9,-7.393],[18230.6,-5.823],[19418.4,3.375],null],"z1k":19418.4,"spark":[4.446,4.449,4.45,4.437,4.44,4.426,4.41,4.408,4.398,4.385,4.37,4.352,4.331,4.307,4.281,4.259,4.247,4.252,4.266,4.282,4.293,4.299,4.304,4.309],"stats":{"zmax":28219.6,"zmin":17635.8,"ph_min":-8.50239,"f_ph_min":33.8439,"f_peak":18.5238,"zi_peak":3183.37,"r_lo":27924.1,"r_hi":20358.8}},{"file_id":79,"path":"csv_archive/gclay6mlwater_eis.csv","filename":"gclay6mlwater_eis.csv","mtime":1786960000.0,"saved_at":"2026-08-17 04:05","kind":"eis","board":"ads1256","n_points":124,"f_lo_hz":0.0790994,"f_hi_hz":5249.26,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":21636.7,"median_phase_raw_deg":-29.6732,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"+6 ml water","summary":"Clay soil at the 6 ml water step, ads1256 rig, 100 ohm shunt, 124 points from 0.08 Hz to 5.25 kHz. Low-frequency raw |Z| falls to 33480 ohm and the high end sits at 758.7 ohm. Median phase is -29.67 deg (range -74.5 to +0.42), less capacitive than at 4 ml. No unresolved points. This is the third step of the watering series, monotonic with its neighbours. A trustworthy soil record.","exclude_reason":null,"confidence":0.85,"zat":[[31774.2,-4.599],[27969.3,-8.344],[20847.4,-10.08],[19694.9,0.9878],null],"z1k":19694.9,"spark":[4.522,4.526,4.529,4.51,4.524,4.503,4.489,4.484,4.474,4.463,4.447,4.429,4.407,4.38,4.348,4.316,4.29,4.281,4.282,4.291,4.297,4.302,4.306,4.311],"stats":{"zmax":34538.9,"zmin":18501.9,"ph_min":-11.2779,"f_ph_min":56.0569,"f_peak":33.8645,"zi_peak":4629.95,"r_lo":33290.0,"r_hi":20434.1}},{"file_id":78,"path":"csv_archive/gclay4mlwater_eis.csv","filename":"gclay4mlwater_eis.csv","mtime":1786960000.0,"saved_at":"2026-08-17 03:39","kind":"eis","board":"ads1256","n_points":124,"f_lo_hz":0.0789771,"f_hi_hz":5248.91,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":27015.5,"median_phase_raw_deg":-36.634,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"+4 ml water","summary":"Clay soil at the 4 ml water step, ads1256 rig, 100 ohm shunt, 124 points. Raw |Z| goes from 45930 ohm at 0.08 Hz to 760.8 ohm at 5.25 kHz, down from 65650 at the 2 ml step. Median phase moves to -36.63 deg (range -76.23 to +0.78), continuing the trend toward more resistive behaviour as moisture rises. No unresolved points. This is the second step of the watering series and fits it smoothly. A trustworthy soil record.","exclude_reason":null,"confidence":0.85,"zat":[[44388.9,-4.103],[38562.8,-10.92],[24403.0,-17.72],[19931.9,-1.177],null],"z1k":19931.9,"spark":[4.66,4.666,4.671,4.661,4.666,4.647,4.634,4.632,4.62,4.606,4.587,4.563,4.531,4.489,4.438,4.38,4.333,4.306,4.297,4.298,4.301,4.304,4.307,4.312],"stats":{"zmax":47472.5,"zmin":19576.9,"ph_min":-18.26,"f_ph_min":75.8312,"f_peak":41.8164,"zi_peak":9183.48,"r_lo":45660.3,"r_hi":20496.6}},{"file_id":77,"path":"csv_archive/gclay2mlwater_eis.csv","filename":"gclay2mlwater_eis.csv","mtime":1786950000.0,"saved_at":"2026-08-17 03:19","kind":"eis","board":"ads1256","n_points":124,"f_lo_hz":0.0790121,"f_hi_hz":5248.74,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":34595.2,"median_phase_raw_deg":-45.0163,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"+2 ml water","summary":"Clay soil after adding 2 ml water, ads1256 rig, 100 ohm shunt, 124 points from 0.08 Hz to 5.25 kHz. Raw |Z| goes from 65650 ohm at the low end to 761.9 ohm at the top. That is far below the dry run's 9.9 MOhm, so the water had a large effect. Phase ranges -78.22 to +1.311 deg with a median of -45.02, much less capacitive than dry. This is the first wet step of the gclay watering series. A clean, trustworthy soil record.","exclude_reason":null,"confidence":0.85,"zat":[[63703.0,-3.36],[55525.9,-12.7],[29092.3,-26.35],[20193.4,-3.336],null],"z1k":20193.4,"spark":[4.815,4.823,4.83,4.818,4.822,4.804,4.792,4.787,4.778,4.764,4.745,4.716,4.675,4.615,4.538,4.449,4.375,4.331,4.311,4.306,4.306,4.307,4.309,4.313],"stats":{"zmax":67625.0,"zmin":20190.6,"ph_min":-27.0462,"f_ph_min":75.9217,"f_peak":41.9589,"zi_peak":17243.8,"r_lo":65251.7,"r_hi":20530.8}},{"file_id":74,"path":"csv_archive/fastdryclay_eis.csv","filename":"fastdryclay_eis.csv","mtime":1786950000.0,"saved_at":"2026-08-17 03:08","kind":"eis","board":"ads1256","n_points":15,"f_lo_hz":1.48464,"f_hi_hz":5247.53,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":37042.9,"median_phase_raw_deg":-86.5689,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"dry","summary":"A fast 15-point sweep of dry clay on the ads1256 rig, 100 ohm shunt, 1.49 Hz to 5.25 kHz. Raw |Z| falls from 1.971 MOhm to 771.5 ohm. Phase stays strongly capacitive, -88.63 to -64.38 deg (median -86.57), consistent with the full dry clay sweep made just before. No unresolved points. It is a quick, coarse repeat of the dry baseline taken just before the 2 ml watering step. Fine as a soil record but low resolution.","exclude_reason":null,"confidence":0.8,"zat":[null,[343218.0,-83.32],[40581.6,-58.87],[20873.6,-9.429],null],"z1k":20873.6,"spark":[6.286,6.166,6.046,5.899,5.749,5.593,5.441,5.29,5.138,4.992,4.853,4.717,4.594,4.5,4.43,4.374,4.349,4.331,4.322,4.317,4.315,4.315,4.316,4.318],"stats":{"zmax":1933180.0,"zmin":20639.9,"ph_min":-83.4245,"f_ph_min":9.54784,"f_peak":1.48464,"zi_peak":1857930.0,"r_lo":534132.0,"r_hi":20795.6}},{"file_id":81,"path":"csv_archive/gclaydry_eis.csv","filename":"gclaydry_eis.csv","mtime":1786950000.0,"saved_at":"2026-08-17 01:36","kind":"eis","board":"ads1256","n_points":124,"f_lo_hz":0.0795885,"f_hi_hz":5248.76,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":60203.2,"median_phase_raw_deg":-86.2796,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"dry","summary":"Dry clay soil on the ads1256 rig, 100 ohm shunt, 124 points from 0.08 Hz to 5.25 kHz. Raw |Z| goes from 9.889 MOhm at the low end down to 773.4 ohm at the top. Median phase is -86.28 deg, so this nearly dry sample behaves almost like a capacitor. Phase spans -148.4 to +34.9 deg, so some low-signal points are noisy. This is the dry baseline before the gclay watering series (2 to 16 ml). A reasonable soil record; the meaning of 'gclay' is not stated.","exclude_reason":null,"confidence":0.8,"zat":[[3126230.0,-69.17],[346806.0,-84.06],[40729.2,-59.22],[20939.1,-9.361],null],"z1k":20939.1,"spark":[6.993,6.95,6.902,6.846,6.849,6.222,6.372,6.168,5.951,5.747,5.544,5.33,5.132,4.928,4.75,4.584,4.458,4.381,4.342,4.326,4.319,4.317,4.317,4.319],"stats":{"zmax":9832400.0,"zmin":20715.0,"ph_min":-148.363,"f_ph_min":0.859366,"f_peak":0.299249,"zi_peak":4437630.0,"r_lo":9436560.0,"r_hi":20848.5}},{"file_id":167,"path":"csv_archive/testresistor20200ohmswithcalibrationapplied_eis.csv","filename":"testresistor20200ohmswithcalibrationapplied_eis.csv","mtime":1786950000.0,"saved_at":"2026-08-17 01:23","kind":"eis","board":"ads1256","n_points":80,"f_lo_hz":5.41199,"f_hi_hz":5250.69,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":14337.8,"median_phase_raw_deg":-43.816,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"resistor","condition":null,"summary":"A 20200 ohm resistor on the old ads1256 rig with a 100 ohm shunt. Raw |Z| falls from 20290 at 5.4 Hz to 749.6 at 5.25 kHz, and phase runs from -75.76 to -2.095 deg (median -43.82). That looks like stray capacitance across a large resistor, not a clean resistor. The high end sits near the same ~750-770 ohm level as the clay runs on this shunt, which suggests a front-end limit. The name says it checked an applied calibration. Not usable as a standard: ads1256 board, check run, capacitive phase.","exclude_reason":"ads1256 board (incompatible calibration); name 'test...withcalibrationapplied' marks a calibration check; median raw phase -43.82 deg is not resistor-like","confidence":0.8,"zat":[null,[20238.3,-0.148],[20258.8,0.2084],[20195.0,0.02802],null],"z1k":20195.0,"spark":[4.306,4.306,4.306,4.306,4.305,4.306,4.305,4.306,4.305,4.305,4.303,4.306,4.306,4.305,4.306,4.304,4.306,4.305,4.306,4.306,4.305,4.306,4.305,4.306],"stats":{"zmax":20275.5,"zmin":19982.6,"ph_min":-0.569141,"f_ph_min":113.742,"f_peak":113.742,"zi_peak":199.134,"r_lo":20227.6,"r_hi":20212.5}},{"file_id":168,"path":"csv_archive/testresistor_eis.csv","filename":"testresistor_eis.csv","mtime":1786950000.0,"saved_at":"2026-08-17 00:56","kind":"eis","board":"ads1256","n_points":12,"f_lo_hz":6.04811,"f_hi_hz":4997.8,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":14088.3,"median_phase_raw_deg":-44.1939,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"resistor","condition":null,"summary":"The name says a test resistor of unstated value, on the ads1256 with a 100 ohm shunt, 12 points from 6.048 Hz to 4998 Hz. Raw |Z| goes from 20360 ohm at the low end to 784.5 ohm at the high end, median 14090 ohm. Phase runs from -1.97 to -75.84 deg, median -44.19 deg. That strongly frequency-dependent, capacitive response contradicts a plain resistor; it is more like a poorly connected or open fixture. The category is doubtful, and the run is not usable as a calibration standard.","exclude_reason":"ads1256 board; no value stated ('testresistor'); median phase -44.19 deg and min -75.84 deg are not resistor-like","confidence":0.35,"zat":[null,[20126.8,-3.172],[17134.9,-26.87],[4170.04,-47.96],null],"z1k":4170.04,"spark":[4.304,4.304,4.304,4.302,4.301,4.298,4.294,4.285,4.274,4.251,4.223,4.178,4.114,4.039,3.948,3.854,3.755,3.66,3.578,3.502,3.452,3.404,3.378,3.353],"stats":{"zmax":20145.0,"zmin":2251.85,"ph_min":-52.9013,"f_ph_min":438.569,"f_peak":131.142,"zi_peak":8561.13,"r_lo":20135.5,"r_hi":2106.79}},{"file_id":118,"path":"csv_archive/opencal_20260814_175337_eis.csv","filename":"opencal_20260814_175337_eis.csv","mtime":1786750000.0,"saved_at":"2026-08-14 18:15","kind":"eis","board":"ads1256","n_points":510,"f_lo_hz":0.0781467,"f_hi_hz":4998.23,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":28101.0,"median_phase_raw_deg":-88.157,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"This is a long 510-point open-circuit calibration on the ads1256 with a 100 ohm shunt, from 0.078 Hz to 4998 Hz. Raw |Z| goes from 18960000 ohm at the low end to 797.2 ohm at the high end, and median phase is -88.16 deg. That is a very clean, near-ideal capacitive open with no unresolved points. It follows the open-air test and is the most thorough open reference in the old archive.","exclude_reason":null,"confidence":0.9,"zat":[[3564710.0,-82.16],[340084.0,-88.95],[36692.9,-89.14],[3602.81,-84.51],null],"z1k":3602.81,"spark":[7.278,7.201,7.111,6.984,6.854,6.679,6.409,6.218,5.976,5.759,5.544,5.348,5.141,4.932,4.725,4.524,4.316,4.107,3.899,3.692,3.486,3.282,3.085,2.902],"stats":{"zmax":18955000.0,"zmin":797.218,"ph_min":-89.763,"f_ph_min":151.38,"f_peak":0.185072,"zi_peak":11098600.0,"r_lo":17394300.0,"r_hi":320.93}},{"file_id":97,"path":"csv_archive/openairttest_eis.csv","filename":"openairttest_eis.csv","mtime":1786750000.0,"saved_at":"2026-08-14 17:53","kind":"eis","board":"ads1256","n_points":18,"f_lo_hz":3910.61,"f_hi_hz":4997.72,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":883.839,"median_phase_raw_deg":-68.6613,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"This is an open-air test (probes in air; 'ttest' is a typo) on the ads1256 with a 100 ohm shunt. It covers only 3911 to 4998 Hz over 18 points. Raw |Z| goes from 983 ohm to 797.7 ohm, and median phase is -68.66 deg. That fits stray capacitance at the ceiling. It immediately precedes the long 2026-08-14 opencal and looks like a quick check before it. Its coverage is limited.","exclude_reason":null,"confidence":0.8,"zat":[null,null,null,null,null],"z1k":null,"spark":[3.377,3.376,3.375,3.374,3.373,3.372,3.372,3.371,3.37,3.369,3.369,3.368,3.367,3.367,3.366,3.365,3.364,3.364,3.363,3.362,3.361,3.361,3.361,3.36],"stats":{"zmax":2379.93,"zmin":2289.6,"ph_min":-25.1736,"f_ph_min":3910.61,"f_peak":3910.61,"zi_peak":1012.33,"r_lo":2153.89,"r_hi":2133.41}},{"file_id":169,"path":"csv_archive/testsatysoil_eis.csv","filename":"testsatysoil_eis.csv","mtime":1786400000.0,"saved_at":"2026-08-10 18:23","kind":"eis","board":"ads1256","n_points":32,"f_lo_hz":0.0813765,"f_hi_hz":4998.28,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":195.767,"median_phase_raw_deg":-22.5263,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"salty","summary":"This is salty soil ('saty' is a typo) on the ads1256 with a 100 ohm shunt, 32 points from 0.081 Hz to 4998 Hz. Raw |Z| goes from 602.4 ohm at the low end to 52.3 ohm at the high end, and median phase is -22.53 deg. It reads lower than the aug10saltysoil run five hours earlier, which suggests the soil got wetter or saltier. It is a plausible repeat of that measurement despite the 'test' prefix.","exclude_reason":null,"confidence":0.75,"zat":[[292.03,-22.57],[237.984,-21.53],[148.434,-26.38],[82.4622,2.861],null],"z1k":82.4622,"spark":[2.78,2.711,2.641,2.566,2.503,2.472,2.448,2.434,2.417,2.399,2.377,2.351,2.315,2.272,2.22,2.161,2.097,2.031,1.972,1.927,1.92,1.959,2.054,2.176],"stats":{"zmax":602.431,"zmin":82.3453,"ph_min":-27.5121,"f_ph_min":0.192886,"f_peak":0.0813765,"zi_peak":223.133,"r_lo":559.584,"r_hi":118.379}},{"file_id":58,"path":"csv_archive/aug10saltysoil_eis.csv","filename":"aug10saltysoil_eis.csv","mtime":1786390000.0,"saved_at":"2026-08-10 13:21","kind":"eis","board":"ads1256","n_points":32,"f_lo_hz":0.0814288,"f_hi_hz":5251.14,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":283.697,"median_phase_raw_deg":-22.9975,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"salty","summary":"This is salty soil measured on 2026-08-10 on the ads1256 with a 100 ohm shunt, 32 points from 0.081 Hz to 5251 Hz. Raw |Z| goes from 1520 ohm at the low end to 93.63 ohm at the high end, and median phase is -23.0 deg. The high-frequency value is close to the previous day's saltysoil run (90.63 ohm). That fits the same salted soil, with polarisation raising the low end. It looks like a reasonable soil measurement.","exclude_reason":null,"confidence":0.85,"zat":[[601.446,-27.73],[341.642,-21.65],[245.226,-16.75],[165.624,1.897],null],"z1k":165.624,"spark":[3.182,3.123,3.056,2.96,2.87,2.79,2.73,2.668,2.613,2.57,2.533,2.5,2.468,2.44,2.412,2.383,2.345,2.304,2.262,2.227,2.222,2.256,2.339,2.443],"stats":{"zmax":1520.46,"zmin":164.966,"ph_min":-29.7135,"f_ph_min":0.471219,"f_peak":0.0814288,"zi_peak":645.727,"r_lo":1376.53,"r_hi":237.759}},{"file_id":90,"path":"csv_archive/limittestingRCcircuit_eis.csv","filename":"limittestingRCcircuit_eis.csv","mtime":1786370000.0,"saved_at":"2026-08-10 10:07","kind":"eis","board":"ads1256","n_points":456,"f_lo_hz":9.01715,"f_hi_hz":10000.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":669.761,"median_phase_raw_deg":-1.90315,"frac_open":0.0899123,"temp_c":null,"medium_tag":"","notes_tag":"","category":"rc_network","condition":null,"summary":"This is a limit-testing sweep of an RC circuit on the ads1256 with a 100 ohm shunt, 456 points from 9.017 Hz to 10 kHz. Raw |Z| sits at 670.6 ohm at the low end, matching the resistive plateau of the parallel-RC run that morning, and falls to 464.9 ohm at the top. Median phase is -1.9 deg, reaching -24.39 deg. So it is probably the same or a similar network with a smaller capacitor, though that is my inference. 9% of points are unresolved. It is a limit-testing run, not a reference.","exclude_reason":null,"confidence":0.7,"zat":[null,[664.312,0.3045],[665.737,2.215],[764.044,18.19],null],"z1k":764.044,"spark":[2.822,2.822,2.822,2.822,2.822,2.822,2.823,2.823,2.823,2.823,2.824,2.825,2.827,2.831,2.836,2.846,2.861,2.884,2.916,2.959,3.008,3.059,3.106,3.139],"stats":{"zmax":1385.5,"zmin":617.445,"ph_min":0.0439381,"f_ph_min":9.68278,"f_peak":9.68278,"zi_peak":-0.509307,"r_lo":663.93,"r_hi":1290.96}},{"file_id":68,"path":"csv_archive/capandresistorinpararrell_eis.csv","filename":"capandresistorinpararrell_eis.csv","mtime":1786370000.0,"saved_at":"2026-08-10 09:29","kind":"eis","board":"ads1256","n_points":263,"f_lo_hz":0.0811583,"f_hi_hz":5500.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":190.612,"median_phase_raw_deg":-58.7293,"frac_open":0.00380228,"temp_c":null,"medium_tag":"","notes_tag":"","category":"rc_network","condition":null,"summary":"This is a capacitor and resistor in parallel ('pararrell') on the ads1256 with a 100 ohm shunt, 263 points from 0.081 Hz to 5.5 kHz. Raw |Z| plateaus at 671.1 ohm at the low end, where the resistor dominates, and falls to 5.104 ohm at high frequency, where the capacitor shorts it out. Phase goes from about +2.2 deg to -79.73 deg, median -58.73 deg. That is the classic parallel RC response, so it is a good RC test case. The component values are not stated.","exclude_reason":null,"confidence":0.85,"zat":[[664.046,-2.345],[615.598,-20.76],[173.311,-69.48],[22.5115,-48.67],null],"z1k":22.5115,"spark":[2.827,2.825,2.822,2.822,2.819,2.822,2.822,2.82,2.817,2.809,2.789,2.746,2.666,2.538,2.372,2.188,1.991,1.793,1.603,1.43,1.295,1.212,1.187,1.18],"stats":{"zmax":671.148,"zmin":15.0413,"ph_min":-73.5966,"f_ph_min":170.964,"f_peak":25.7078,"zi_peak":319.822,"r_lo":671.146,"r_hi":15.1143}},{"file_id":34,"path":"csv_archive/1047uScmknown_eis.csv","filename":"1047uScmknown_eis.csv","mtime":1786350000.0,"saved_at":"2026-08-10 04:38","kind":"eis","board":"ads1256","n_points":190,"f_lo_hz":0.911029,"f_hi_hz":5500.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":616.847,"median_phase_raw_deg":-23.7692,"frac_open":0.00526316,"temp_c":null,"medium_tag":"","notes_tag":"","category":"conductivity_standard","condition":"1047 uS/cm known sample","summary":"This is a 1047 uS/cm conductivity standard on the ads1256 with a 100 ohm shunt, 190 points from 0.911 Hz to 5.5 kHz. Raw |Z| goes from 1692 ohm at the low end to 236.8 ohm at the high end, median 616.8 ohm. Median phase is -23.77 deg. That fits an ionic solution with electrode polarisation. Only 0.5% of points are unresolved. It is a trustworthy solution reference, but only for the old hardware.","exclude_reason":null,"confidence":0.9,"zat":[[1661.62,-15.39],[1098.75,-24.96],[596.576,-23.63],[400.874,4.231],null],"z1k":400.874,"spark":[3.224,3.212,3.191,3.171,3.135,3.099,3.059,3.015,2.969,2.924,2.88,2.836,2.796,2.751,2.715,2.679,2.645,2.618,2.603,2.608,2.638,2.694,2.768,2.846],"stats":{"zmax":1673.85,"zmin":399.56,"ph_min":-26.7012,"f_ph_min":30.7279,"f_peak":2.78694,"zi_peak":504.233,"r_lo":1612.12,"r_hi":615.884}},{"file_id":178,"path":"csv_archive/tesy_eis.csv","filename":"tesy_eis.csv","mtime":1786350000.0,"saved_at":"2026-08-10 04:28","kind":"eis","board":"ads1256","n_points":10,"f_lo_hz":1.02273,"f_hi_hz":5500.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":30595.2,"median_phase_raw_deg":-77.1512,"frac_open":0.1,"temp_c":null,"medium_tag":"","notes_tag":"","category":"test","condition":null,"summary":"This is a 10-point quick test ('tesy' is a typo for test) on the ads1256 with a 100 ohm shunt. Raw |Z| goes from 49140 ohm at the low end to 1714 ohm at the high end, median 30600 ohm. Median phase is -77.15 deg, with a stray point at +7.8 deg. That is strongly capacitive but with a much lower low-frequency |Z| than an open, perhaps a partly connected fixture. I can't tell what was measured, so this label is low-trust.","exclude_reason":null,"confidence":0.35,"zat":[null,[38743.0,0.6699],[34392.9,-85.42],[4270.86,-56.76],null],"z1k":4270.86,"spark":[4.686,5.235,5.783,5.938,5.454,4.97,4.643,4.58,4.517,4.541,4.676,4.811,4.797,4.653,4.509,4.261,3.962,3.662,3.617,3.648,3.68,3.609,3.525,3.441],"stats":{"zmax":1325340.0,"zmin":2760.38,"ph_min":-87.3982,"f_ph_min":45.9803,"f_peak":2.43857,"zi_peak":1295040.0,"r_lo":40958.4,"r_hi":2213.52}},{"file_id":144,"path":"csv_archive/test'_eis.csv","filename":"test'_eis.csv","mtime":1786350000.0,"saved_at":"2026-08-10 04:27","kind":"eis","board":"ads1256","n_points":10,"f_lo_hz":1.04443,"f_hi_hz":5500.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":1,"array_type":null,"median_zmag_raw":75644.1,"median_phase_raw_deg":-86.4194,"frac_open":0.1,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"This is a quick 10-point test on the ads1256 with a 100 ohm shunt. The name doesn't say what was on the terminals. Raw |Z| goes from 3414000 ohm at the low end to 1716 ohm at the high end, and median phase is -86.42 deg. That matches the opencal sweeps minutes earlier, so the terminals were almost certainly open. A calibration and open correction were active, so it was probably a check of the new open. One point in ten is unresolved.","exclude_reason":null,"confidence":0.55,"zat":[null,[27637200.0,-98.76],[2638740.0,59.51],[3111190.0,90.09],null],"z1k":3111190.0,"spark":[7.09,7.19,7.291,7.355,7.373,7.392,7.415,7.447,7.479,7.422,7.277,7.131,6.909,6.636,6.362,6.312,6.386,6.46,6.485,6.498,6.51,6.485,6.456,6.427],"stats":{"zmax":31220800.0,"zmin":1837210.0,"ph_min":-111.372,"f_ph_min":2.43858,"f_peak":17.4298,"zi_peak":30893900.0,"r_lo":-852854.0,"r_hi":714655.0}},{"file_id":117,"path":"csv_archive/opencal_20260810_042046_eis.csv","filename":"opencal_20260810_042046_eis.csv","mtime":1786350000.0,"saved_at":"2026-08-10 04:22","kind":"eis","board":"ads1256","n_points":45,"f_lo_hz":1.02263,"f_hi_hz":5500.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":51988.8,"median_phase_raw_deg":-86.3112,"frac_open":0.0222222,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"This is a 45-point open-circuit calibration on the ads1256 with a 100 ohm shunt. Raw |Z| goes from 3390000 ohm at the low end to 874.8 ohm at the high end, and median phase is -86.31 deg. It is the densest of the 04:18 to 04:22 opencal trio and consistent with the others. It is a reliable open reference for the old hardware.","exclude_reason":null,"confidence":0.85,"zat":[null,[339515.0,-87.28],[35182.4,-88.69],[3540.75,-83.49],null],"z1k":3540.75,"spark":[6.53,6.347,6.194,6.047,5.886,5.728,5.57,5.412,5.247,5.091,4.937,4.781,4.632,4.472,4.314,4.156,3.999,3.841,3.684,3.528,3.374,3.222,3.077,2.942],"stats":{"zmax":3390000.0,"zmin":874.798,"ph_min":-88.7844,"f_ph_min":59.8967,"f_peak":1.02263,"zi_peak":3061240.0,"r_lo":1456340.0,"r_hi":372.587}},{"file_id":116,"path":"csv_archive/opencal_20260810_041939_eis.csv","filename":"opencal_20260810_041939_eis.csv","mtime":1786350000.0,"saved_at":"2026-08-10 04:20","kind":"eis","board":"ads1256","n_points":20,"f_lo_hz":1.03173,"f_hi_hz":5500.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":58834.3,"median_phase_raw_deg":-86.0383,"frac_open":0.05,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"This is a 20-point open-circuit calibration on the ads1256 with a 100 ohm shunt. Raw |Z| goes from 3408000 ohm at the low end to 1086 ohm at the high end, and median phase is -86.04 deg. It is nearly identical to the 04:18 opencal, a repeat in a short series that agrees with its neighbours. It is a reliable open for the old rig.","exclude_reason":null,"confidence":0.85,"zat":[null,[334916.0,-87.48],[34206.2,-88.46],[3542.23,-83.4],null],"z1k":3542.23,"spark":[6.532,6.325,6.197,6.053,5.898,5.744,5.59,5.437,5.287,5.137,4.984,4.836,4.681,4.526,4.38,4.228,4.075,3.922,3.77,3.618,3.468,3.32,3.175,3.036],"stats":{"zmax":3407680.0,"zmin":1086.39,"ph_min":-88.7784,"f_ph_min":59.0,"f_peak":1.03173,"zi_peak":3146560.0,"r_lo":1308230.0,"r_hi":375.283}},{"file_id":115,"path":"csv_archive/opencal_20260810_041839_eis.csv","filename":"opencal_20260810_041839_eis.csv","mtime":1786350000.0,"saved_at":"2026-08-10 04:19","kind":"eis","board":"ads1256","n_points":20,"f_lo_hz":1.02176,"f_hi_hz":5500.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":58963.3,"median_phase_raw_deg":-86.0606,"frac_open":0.05,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"This is a 20-point open-circuit calibration on the ads1256 with a 100 ohm shunt. Raw |Z| goes from 3422000 ohm at the low end to 1088 ohm at the high end, and median phase is -86.06 deg. That is a clean capacitive open, matching the earlier opens that morning. It was taken right after the second 2000 ohm resistor run and is the first of three opencals at 04:18 to 04:22.","exclude_reason":null,"confidence":0.85,"zat":[null,[336114.0,-87.31],[34056.7,-88.4],[3545.33,-83.41],null],"z1k":3545.33,"spark":[6.534,6.326,6.199,6.056,5.902,5.75,5.595,5.444,5.292,5.14,4.99,4.838,4.681,4.526,4.382,4.23,4.077,3.924,3.771,3.619,3.469,3.32,3.176,3.037],"stats":{"zmax":3421870.0,"zmin":1087.78,"ph_min":-88.7807,"f_ph_min":58.5172,"f_peak":1.02176,"zi_peak":3205080.0,"r_lo":1198610.0,"r_hi":376.092}},{"file_id":44,"path":"csv_archive/2000ohmsknownresistor_eis.csv","filename":"2000ohmsknownresistor_eis.csv","mtime":1786350000.0,"saved_at":"2026-08-10 04:15","kind":"eis","board":"ads1256","n_points":20,"f_lo_hz":1.02984,"f_hi_hz":5500.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":2015.79,"median_phase_raw_deg":-1.79185,"frac_open":0.05,"temp_c":null,"medium_tag":"","notes_tag":"","category":"resistor","condition":null,"summary":"This is the known 2000 ohm resistor repeated half an hour later, on the ads1256 with a 100 ohm shunt. Raw |Z| goes from 2013 ohm at the low end, median 2016 ohm, to 894.4 ohm at 5.5 kHz. Median phase is -1.8 deg, with the same high-frequency dip to -45.4 deg. Its median |Z| is about 13% below the 2309 ohm of the first run. This run had no open correction, which may explain the gap, but the gap is worth noting. It is not usable as a calibration standard because it is on ads1256 hardware.","exclude_reason":"ads1256 board (old rig); median raw |Z| 2016 ohm differs from the 2309 ohm of the earlier 2000 ohm run","confidence":0.85,"zat":[null,[2000.17,-0.05966],[1999.39,0.1507],[2000.64,0.01313],null],"z1k":2000.64,"spark":[3.299,3.302,3.301,3.301,3.301,3.301,3.301,3.301,3.301,3.301,3.301,3.301,3.301,3.301,3.301,3.301,3.301,3.301,3.301,3.301,3.301,3.301,3.302,3.302],"stats":{"zmax":2005.82,"zmin":1988.43,"ph_min":-1.79663,"f_ph_min":1.02984,"f_peak":1.02984,"zi_peak":62.3411,"r_lo":1987.45,"r_hi":2002.38}},{"file_id":43,"path":"csv_archive/2000ohmknownresistor_eis.csv","filename":"2000ohmknownresistor_eis.csv","mtime":1786350000.0,"saved_at":"2026-08-10 03:42","kind":"eis","board":"ads1256","n_points":20,"f_lo_hz":1.02655,"f_hi_hz":5500.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":1,"array_type":null,"median_zmag_raw":2308.86,"median_phase_raw_deg":-2.08837,"frac_open":0.05,"temp_c":null,"medium_tag":"","notes_tag":"","category":"resistor","condition":null,"summary":"This is a known 2000 ohm resistor on the ads1256 with a 100 ohm shunt, 20 points from 1.03 Hz to 5.5 kHz. Raw |Z| sits at 2307 ohm at the low end, median 2309 ohm, and rolls off to 920.9 ohm at 5.5 kHz. Median phase is -2.1 deg, dipping to -48 deg at the top of the band, which looks like a high-frequency front-end roll-off. An open correction was active, and 5% of points are unresolved. The data fits a resistor, but it is not usable as a calibration standard because it is on the old ads1256 hardware.","exclude_reason":"ads1256 board (old rig, incompatible calibration)","confidence":0.9,"zat":[null,[1988.64,0.4613],[2098.65,3.602],[2740.58,29.18],null],"z1k":2740.58,"spark":[3.294,3.296,3.297,3.297,3.297,3.298,3.298,3.301,3.304,3.304,3.305,3.307,3.31,3.324,3.36,3.36,3.366,3.376,3.391,3.418,3.466,3.536,3.627,3.738],"stats":{"zmax":5469.89,"zmin":1969.8,"ph_min":-2.52764,"f_ph_min":1.02655,"f_peak":1.02655,"zi_peak":86.8707,"r_lo":1967.88,"r_hi":3223.13}},{"file_id":114,"path":"csv_archive/opencal_20260810_024444_eis.csv","filename":"opencal_20260810_024444_eis.csv","mtime":1786350000.0,"saved_at":"2026-08-10 02:47","kind":"eis","board":"ads1256","n_points":60,"f_lo_hz":0.942607,"f_hi_hz":5500.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":50231.6,"median_phase_raw_deg":-86.4144,"frac_open":0.0166667,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"This is a 60-point open-circuit calibration on the ads1256 with a 100 ohm shunt. Raw |Z| goes from 3396000 ohm at the low end to 838.4 ohm at the high end, and median phase is -86.41 deg. It is the last and densest of the early-morning opencal repeats on 2026-08-10 and agrees with them. It is probably the open that was applied to the 2000 ohm resistor run an hour later.","exclude_reason":null,"confidence":0.85,"zat":[[3246390.0,-67.7],[339472.0,-87.46],[33871.3,-88.66],[3523.44,-83.46],null],"z1k":3523.44,"spark":[6.531,6.399,6.235,6.087,5.909,5.75,5.59,5.428,5.269,5.106,4.953,4.789,4.641,4.472,4.313,4.152,3.992,3.833,3.673,3.514,3.358,3.204,3.058,2.923],"stats":{"zmax":3396060.0,"zmin":838.371,"ph_min":-88.7738,"f_ph_min":68.1803,"f_peak":0.942607,"zi_peak":3108040.0,"r_lo":1368680.0,"r_hi":372.313}},{"file_id":113,"path":"csv_archive/opencal_20260810_024254_eis.csv","filename":"opencal_20260810_024254_eis.csv","mtime":1786350000.0,"saved_at":"2026-08-10 02:44","kind":"eis","board":"ads1256","n_points":30,"f_lo_hz":0.937575,"f_hi_hz":5500.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":54160.5,"median_phase_raw_deg":-85.6405,"frac_open":0.0333333,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"This is a 30-point open-circuit calibration on the ads1256 with a 100 ohm shunt, starting at 0.938 Hz. Raw |Z| goes from 3366000 ohm at the low end to 947.0 ohm at the high end, and median phase is -85.64 deg. It agrees with the other coarse opens in this series, with one of thirty points unresolved. It is a reliable open.","exclude_reason":null,"confidence":0.85,"zat":[[3205650.0,-65.13],[335278.0,-87.25],[34103.3,-88.66],[3525.88,-83.42],null],"z1k":3525.88,"spark":[6.527,6.407,6.245,6.082,5.922,5.767,5.615,5.445,5.291,5.134,4.975,4.823,4.662,4.504,4.353,4.196,4.038,3.88,3.724,3.569,3.414,3.261,3.115,2.976],"stats":{"zmax":3365930.0,"zmin":947.032,"ph_min":-88.7738,"f_ph_min":47.3548,"f_peak":0.937575,"zi_peak":3017170.0,"r_lo":1492030.0,"r_hi":374.019}},{"file_id":112,"path":"csv_archive/opencal_20260810_023945_eis.csv","filename":"opencal_20260810_023945_eis.csv","mtime":1786350000.0,"saved_at":"2026-08-10 02:41","kind":"eis","board":"ads1256","n_points":30,"f_lo_hz":0.870252,"f_hi_hz":5500.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":54134.9,"median_phase_raw_deg":-86.922,"frac_open":0.0333333,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"This is a 30-point open-circuit calibration on the ads1256 with a 100 ohm shunt. Raw |Z| goes from 3387000 ohm at the low end to 946.2 ohm at the high end, and median phase is -86.92 deg. It closely matches the preceding coarse opencals, so it is another consistent repeat in the 02:36 to 02:47 series and a reliable open.","exclude_reason":null,"confidence":0.85,"zat":[[3090190.0,-69.5],[332864.0,-87.19],[34120.5,-88.66],[3524.97,-83.41],null],"z1k":3524.97,"spark":[6.53,6.424,6.276,6.111,5.944,5.791,5.633,5.464,5.308,5.154,4.998,4.84,4.683,4.518,4.365,4.208,4.048,3.888,3.731,3.574,3.418,3.264,3.116,2.976],"stats":{"zmax":3387290.0,"zmin":946.178,"ph_min":-88.7901,"f_ph_min":64.2261,"f_peak":0.870252,"zi_peak":3140770.0,"r_lo":1268580.0,"r_hi":372.666}},{"file_id":111,"path":"csv_archive/opencal_20260810_023819_eis.csv","filename":"opencal_20260810_023819_eis.csv","mtime":1786350000.0,"saved_at":"2026-08-10 02:39","kind":"eis","board":"ads1256","n_points":30,"f_lo_hz":0.870252,"f_hi_hz":5500.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":54141.7,"median_phase_raw_deg":-85.5936,"frac_open":0.0333333,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"This is a 30-point open-circuit calibration on the ads1256 with a 100 ohm shunt. Raw |Z| goes from 3393000 ohm at the low end to 946.9 ohm at the high end, and median phase is -85.59 deg. It is practically identical to the 02:36 sweep. It is a repeat in a series of coarse opens and consistent with its neighbours.","exclude_reason":null,"confidence":0.85,"zat":[[3090640.0,-69.01],[337242.0,-87.18],[34064.4,-88.67],[3526.41,-83.42],null],"z1k":3526.41,"spark":[6.531,6.423,6.28,6.12,5.945,5.792,5.634,5.47,5.313,5.149,4.996,4.838,4.678,4.517,4.365,4.207,4.048,3.89,3.732,3.574,3.418,3.264,3.116,2.976],"stats":{"zmax":3392840.0,"zmin":946.923,"ph_min":-88.7855,"f_ph_min":63.1054,"f_peak":0.870252,"zi_peak":3127880.0,"r_lo":1314420.0,"r_hi":373.623}},{"file_id":110,"path":"csv_archive/opencal_20260810_023646_eis.csv","filename":"opencal_20260810_023646_eis.csv","mtime":1786350000.0,"saved_at":"2026-08-10 02:38","kind":"eis","board":"ads1256","n_points":30,"f_lo_hz":0.870253,"f_hi_hz":5500.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":54159.7,"median_phase_raw_deg":-86.846,"frac_open":0.0333333,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"This is a 30-point open-circuit calibration on the ads1256 with a 100 ohm shunt. Raw |Z| goes from 3346000 ohm at the low end to 948.4 ohm at the high end, and median phase is -86.85 deg. One point in thirty is unresolved. It is one of several quick coarse opencal repeats around 02:40 that agree closely with each other. It is a reliable open.","exclude_reason":null,"confidence":0.85,"zat":[[3078280.0,-68.41],[337821.0,-87.33],[34158.9,-88.65],[3526.52,-83.42],null],"z1k":3526.52,"spark":[6.525,6.429,6.281,6.111,5.947,5.792,5.632,5.471,5.313,5.157,4.998,4.839,4.68,4.518,4.365,4.207,4.048,3.887,3.731,3.574,3.418,3.264,3.116,2.977],"stats":{"zmax":3346060.0,"zmin":948.361,"ph_min":-88.7826,"f_ph_min":47.0372,"f_peak":0.870253,"zi_peak":3067780.0,"r_lo":1335990.0,"r_hi":373.625}},{"file_id":109,"path":"csv_archive/opencal_20260810_022711_eis.csv","filename":"opencal_20260810_022711_eis.csv","mtime":1786350000.0,"saved_at":"2026-08-10 02:33","kind":"eis","board":"ads1256","n_points":145,"f_lo_hz":0.852607,"f_hi_hz":5500.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":41736.5,"median_phase_raw_deg":-86.441,"frac_open":0.00689655,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"This is an open-circuit calibration on the ads1256 with a 100 ohm shunt, 145 points. Raw |Z| goes from 3360000 ohm at 0.85 Hz to 786.4 ohm at 5.5 kHz, and median phase is -86.44 deg. It almost exactly repeats the 01:30 opencal, which shows good repeatability. It is a clean open reference for the old hardware.","exclude_reason":null,"confidence":0.85,"zat":[[3101120.0,-69.9],[336499.0,-87.23],[34532.2,-88.67],[3535.04,-83.49],null],"z1k":3535.04,"spark":[6.526,6.416,6.27,6.106,5.944,5.777,5.611,5.443,5.28,5.117,4.959,4.793,4.636,4.465,4.307,4.144,3.98,3.817,3.654,3.492,3.332,3.177,3.029,2.896],"stats":{"zmax":3360180.0,"zmin":786.388,"ph_min":-88.8421,"f_ph_min":60.282,"f_peak":0.852607,"zi_peak":3145580.0,"r_lo":1181570.0,"r_hi":371.714}},{"file_id":108,"path":"csv_archive/opencal_20260810_013015_eis.csv","filename":"opencal_20260810_013015_eis.csv","mtime":1786340000.0,"saved_at":"2026-08-10 01:36","kind":"eis","board":"ads1256","n_points":145,"f_lo_hz":0.944013,"f_hi_hz":5500.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":41509.1,"median_phase_raw_deg":-86.5136,"frac_open":0.00689655,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"This is an open-circuit calibration on the ads1256 with a 100 ohm shunt, 145 points from 0.944 Hz to 5.5 kHz. Raw |Z| goes from 3370000 ohm at the low end to 781.1 ohm at the high end, and median phase is -86.51 deg. That is a clean capacitive open. It is the first of a run of opencal sweeps in the early hours of 2026-08-10, after the cm series, and a good open reference for the old rig.","exclude_reason":null,"confidence":0.85,"zat":[[3221880.0,-67.92],[336904.0,-87.46],[34242.5,-88.65],[3515.41,-83.45],null],"z1k":3515.41,"spark":[6.528,6.384,6.25,6.06,5.904,5.74,5.576,5.409,5.254,5.09,4.928,4.768,4.615,4.439,4.288,4.126,3.964,3.803,3.642,3.482,3.324,3.171,3.025,2.893],"stats":{"zmax":3370030.0,"zmin":781.07,"ph_min":-89.2603,"f_ph_min":161.744,"f_peak":0.944013,"zi_peak":3097980.0,"r_lo":1326520.0,"r_hi":371.356}},{"file_id":54,"path":"csv_archive/6-5cm_eis.csv","filename":"6-5cm_eis.csv","mtime":1786340000.0,"saved_at":"2026-08-10 01:18","kind":"eis","board":"ads1256","n_points":145,"f_lo_hz":1.0,"f_hi_hz":5500.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":538.255,"median_phase_raw_deg":-6.31886,"frac_open":0.00689655,"temp_c":null,"medium_tag":"","notes_tag":"","category":"other","condition":"depth/spacing series step 6 (5 cm?)","summary":"This is the last step of the cm series on the ads1256 with a 100 ohm shunt. Raw |Z| goes from 816.3 ohm at the low end to 368.2 ohm at the high end, median 538.3 ohm, similar to step 5. Median phase is -6.3 deg, but the range spans -160.9 to 166.0 deg, so some points wrapped or flipped. Treat those points with care. The medium is uncertain.","exclude_reason":null,"confidence":0.35,"zat":[[808.029,162.0],[623.128,-2.245],[623.88,-0.08273],[551.111,16.98],null],"z1k":551.111,"spark":[2.907,2.877,3.296,2.592,2.802,2.814,2.783,2.772,2.786,2.827,2.836,2.81,2.861,2.731,2.841,2.925,2.988,2.76,2.743,2.859,2.836,2.912,2.979,3.04],"stats":{"zmax":2210.29,"zmin":51.1689,"ph_min":-160.137,"f_ph_min":2.37983,"f_peak":3.3664,"zi_peak":804.806,"r_lo":-768.681,"r_hi":980.792}},{"file_id":53,"path":"csv_archive/5-4cm_eis.csv","filename":"5-4cm_eis.csv","mtime":1786340000.0,"saved_at":"2026-08-10 01:09","kind":"eis","board":"ads1256","n_points":145,"f_lo_hz":0.852915,"f_hi_hz":5500.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":517.661,"median_phase_raw_deg":-5.20683,"frac_open":0.00689655,"temp_c":null,"medium_tag":"","notes_tag":"","category":"other","condition":"depth/spacing series step 5 (4 cm?)","summary":"This is step 5 of the cm series on the ads1256 with a 100 ohm shunt. Raw |Z| drops sharply here, from 620 ohm at the low end to 350.2 ohm at the high end, median 517.7 ohm, against 1220 ohm in step 4. Median phase is -5.2 deg. The jump suggests the electrodes reached a more conductive layer or something in the setup changed. The medium is uncertain.","exclude_reason":null,"confidence":0.35,"zat":[[613.408,-3.133],[585.587,-2.508],[581.664,0.2972],[517.148,17.32],null],"z1k":517.148,"spark":[2.788,2.781,2.774,2.784,2.843,2.763,2.789,2.746,2.747,2.782,2.79,2.788,2.811,2.743,2.697,3.096,2.748,2.748,2.709,2.811,2.806,2.883,2.953,3.018],"stats":{"zmax":1339.74,"zmin":480.469,"ph_min":-17.9687,"f_ph_min":18.7023,"f_peak":4.08513,"zi_peak":232.326,"r_lo":613.177,"r_hi":920.175}},{"file_id":48,"path":"csv_archive/4-3cm_eis.csv","filename":"4-3cm_eis.csv","mtime":1786340000.0,"saved_at":"2026-08-10 00:45","kind":"eis","board":"ads1256","n_points":145,"f_lo_hz":0.870253,"f_hi_hz":5500.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":1219.85,"median_phase_raw_deg":-16.1914,"frac_open":0.00689655,"temp_c":null,"medium_tag":"","notes_tag":"","category":"other","condition":"depth/spacing series step 4 (3 cm?)","summary":"This is step 4 of the cm series on the ads1256 with a 100 ohm shunt. Raw |Z| goes from 1675 ohm at the low end to 451.3 ohm at the high end, median 1220 ohm. Median phase is -16.19 deg. The median |Z| keeps sliding down from step 3, while the phase grows slightly more capacitive. It is consistent with the series, but the medium is unstated.","exclude_reason":null,"confidence":0.35,"zat":[[1644.64,-8.911],[1561.81,-8.577],[1338.31,-11.17],[867.204,4.457],null],"z1k":867.204,"spark":[3.22,3.212,3.201,3.203,3.303,3.187,3.233,3.17,3.188,3.195,3.227,3.186,3.187,3.077,3.043,3.413,3.061,3.0,2.949,3.033,2.999,3.049,3.091,3.129],"stats":{"zmax":2718.75,"zmin":866.094,"ph_min":-25.3661,"f_ph_min":18.7014,"f_peak":256.981,"zi_peak":947.43,"r_lo":1636.09,"r_hi":1288.27}},{"file_id":46,"path":"csv_archive/3-2cm_eis.csv","filename":"3-2cm_eis.csv","mtime":1786340000.0,"saved_at":"2026-08-10 00:37","kind":"eis","board":"ads1256","n_points":145,"f_lo_hz":0.860291,"f_hi_hz":5500.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":1265.66,"median_phase_raw_deg":-13.2836,"frac_open":0.00689655,"temp_c":null,"medium_tag":"","notes_tag":"","category":"other","condition":"depth/spacing series step 3 (2 cm?)","summary":"This is step 3 of the cm series on the ads1256 with a 100 ohm shunt. Raw |Z| goes from 1593 ohm at the low end to 494.4 ohm at the high end, median 1266 ohm. Median phase is -13.28 deg. It continues the gradual decrease from steps 1 and 2. It is a moderately resistive medium of uncertain identity, consistent with a probe-depth sweep.","exclude_reason":null,"confidence":0.35,"zat":[[1578.96,-9.454],[1539.66,-6.817],[1395.62,-8.396],[970.811,5.177],null],"z1k":970.811,"spark":[3.198,3.2,3.19,3.195,3.273,3.178,3.212,3.166,3.169,3.196,3.223,3.189,3.202,3.118,3.063,3.445,3.084,3.05,2.996,3.079,3.05,3.1,3.137,3.168],"stats":{"zmax":2953.78,"zmin":968.188,"ph_min":-23.117,"f_ph_min":18.702,"f_peak":256.6,"zi_peak":933.307,"r_lo":1552.47,"r_hi":1425.45}},{"file_id":41,"path":"csv_archive/2-1cm_eis.csv","filename":"2-1cm_eis.csv","mtime":1786340000.0,"saved_at":"2026-08-10 00:28","kind":"eis","board":"ads1256","n_points":145,"f_lo_hz":0.853216,"f_hi_hz":5500.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":1318.62,"median_phase_raw_deg":-11.8683,"frac_open":0.00689655,"temp_c":null,"medium_tag":"","notes_tag":"","category":"other","condition":"depth/spacing series step 2 (1 cm?)","summary":"This is step 2 of the cm series on the ads1256 with a 100 ohm shunt. Raw |Z| goes from 1594 ohm at the low end to 507 ohm at the high end, median 1319 ohm. That is slightly lower than step 1. Median phase is -11.87 deg. The steady drop fits deeper insertion or more wetted electrode area, but the medium and the meaning of 'cm' are inferred. It is consistent with its neighbours.","exclude_reason":null,"confidence":0.35,"zat":[[1574.36,-6.445],[1555.0,-5.365],[1463.79,-6.973],[1023.86,4.482],null],"z1k":1023.86,"spark":[3.198,3.196,3.188,3.245,3.26,3.18,3.23,3.17,3.178,3.205,3.217,3.193,3.218,3.138,3.081,3.464,3.098,3.078,3.019,3.1,3.07,3.117,3.151,3.179],"stats":{"zmax":3123.0,"zmin":1021.71,"ph_min":-21.6163,"f_ph_min":18.7693,"f_peak":256.98,"zi_peak":949.867,"r_lo":1569.89,"r_hi":1469.52}},{"file_id":29,"path":"csv_archive/1-0cm_eis.csv","filename":"1-0cm_eis.csv","mtime":1786340000.0,"saved_at":"2026-08-10 00:19","kind":"eis","board":"ads1256","n_points":145,"f_lo_hz":0.853283,"f_hi_hz":5500.0,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":1547.89,"median_phase_raw_deg":-6.19774,"frac_open":0.00689655,"temp_c":null,"medium_tag":"","notes_tag":"","category":"other","condition":"depth/spacing series step 1 (0 cm?)","summary":"This is the first run of a six-step series ('1-0cm' to '6-5cm') on the ads1256 with a 100 ohm shunt. It probably varies probe depth or water level in cm, but the medium is not stated. Raw |Z| goes from 1785 ohm at 0.85 Hz to 580.6 ohm at 5.5 kHz. Median phase is -6.2 deg, which is fairly resistive and fits water or wet medium more than dry soil. Only 0.7% of points are unresolved. The medium is uncertain.","exclude_reason":null,"confidence":0.35,"zat":[[1768.98,-1.958],[1741.99,-1.902],[1728.07,-1.307],[1391.6,3.705],null],"z1k":1391.6,"spark":[3.247,3.245,3.238,3.247,3.31,3.229,3.281,3.221,3.223,3.259,3.275,3.265,3.287,3.231,3.171,3.568,3.218,3.206,3.153,3.232,3.191,3.219,3.23,3.238],"stats":{"zmax":3968.95,"zmin":1390.69,"ph_min":-17.7541,"f_ph_min":18.77,"f_peak":257.147,"zi_peak":824.833,"r_lo":1766.01,"r_hi":1715.72}},{"file_id":107,"path":"csv_archive/opencal_20260809_195024_eis.csv","filename":"opencal_20260809_195024_eis.csv","mtime":1786320000.0,"saved_at":"2026-08-09 19:54","kind":"eis","board":"ads1256","n_points":90,"f_lo_hz":2.25252,"f_hi_hz":5481.38,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":31335.7,"median_phase_raw_deg":-86.6978,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"This is an open-circuit calibration on the ads1256 with a 100 ohm shunt, 90 points from 2.253 Hz to 5481 Hz. Raw |Z| goes from 1568000 ohm at the low end to 740.9 ohm at the high end, and median phase is -86.7 deg. That is a clean, near-ideal capacitive open. It is the last and most complete of the four opencal attempts on 2026-08-09 and the best open reference from that evening.","exclude_reason":null,"confidence":0.85,"zat":[null,[334415.0,-87.3],[33823.1,-88.62],[3489.12,-83.36],null],"z1k":3489.12,"spark":[6.195,6.018,5.895,5.729,5.583,5.437,5.286,5.144,4.997,4.852,4.709,4.55,4.415,4.269,4.123,3.977,3.831,3.685,3.54,3.396,3.255,3.118,2.989,2.87],"stats":{"zmax":1568080.0,"zmin":740.925,"ph_min":-88.7199,"f_ph_min":43.2536,"f_peak":2.25252,"zi_peak":1545190.0,"r_lo":266935.0,"r_hi":366.375}},{"file_id":106,"path":"csv_archive/opencal_20260809_194922_eis.csv","filename":"opencal_20260809_194922_eis.csv","mtime":1786320000.0,"saved_at":"2026-08-09 19:50","kind":"eis","board":"ads1256","n_points":22,"f_lo_hz":865.843,"f_hi_hz":5479.41,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":1646.07,"median_phase_raw_deg":-75.5245,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"This is an open-circuit calibration on the ads1256 with a 100 ohm shunt, 22 points from 865.8 Hz to 5479 Hz. Raw |Z| goes from 4017 ohm at the low end to 741.2 ohm at the high end, and median phase is -75.52 deg. That is the capacitive signature expected of an open. It is the third short attempt in this opencal sequence and is consistent with its neighbours, but still a partial sweep.","exclude_reason":null,"confidence":0.75,"zat":[null,null,null,[2658.22,-56.99],null],"z1k":2658.22,"spark":[3.604,3.569,3.383,3.451,3.469,3.434,3.4,3.365,3.331,3.298,3.266,3.233,3.201,3.168,3.135,3.104,3.063,3.028,3.006,2.983,2.951,2.916,2.889,2.87],"stats":{"zmax":4017.23,"zmin":741.164,"ph_min":-84.1844,"f_ph_min":865.843,"f_peak":865.843,"zi_peak":3996.55,"r_lo":407.052,"r_hi":367.7}},{"file_id":105,"path":"csv_archive/opencal_20260809_194839_eis.csv","filename":"opencal_20260809_194839_eis.csv","mtime":1786320000.0,"saved_at":"2026-08-09 19:49","kind":"eis","board":"ads1256","n_points":9,"f_lo_hz":3155.2,"f_hi_hz":5489.33,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":926.08,"median_phase_raw_deg":-65.5881,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"This is an open-circuit calibration on the ads1256 with a 100 ohm shunt, only 9 points from 3155 Hz to 5489 Hz. Raw |Z| goes from 1170 ohm down to 742.8 ohm, and median phase is -65.59 deg. That fits stray capacitance near the front-end ceiling. It is the second of four quick opencal tries on 2026-08-09 and looks like an aborted, high-frequency-only sweep. Its coverage is limited.","exclude_reason":null,"confidence":0.75,"zat":[null,null,null,null,null],"z1k":null,"spark":[3.068,3.059,3.05,3.041,3.03,3.018,3.008,3.001,2.994,2.987,2.979,2.971,2.96,2.947,2.934,2.925,2.921,2.917,2.91,2.902,2.894,2.887,2.879,2.871],"stats":{"zmax":1170.19,"zmin":742.829,"ph_min":-71.3242,"f_ph_min":3155.2,"f_peak":3155.2,"zi_peak":1108.57,"r_lo":374.708,"r_hi":368.291}},{"file_id":104,"path":"csv_archive/opencal_20260809_194354_eis.csv","filename":"opencal_20260809_194354_eis.csv","mtime":1786320000.0,"saved_at":"2026-08-09 19:48","kind":"eis","board":"ads1256","n_points":110,"f_lo_hz":2.83441,"f_hi_hz":5479.73,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":4563.36,"median_phase_raw_deg":-55.4143,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"This is an open-circuit calibration sweep on the ads1256 with a 100 ohm shunt, from 2.834 Hz to 5480 Hz. Raw |Z| goes from 6939 ohm at the low end to 728.6 ohm at the high end, median 4563 ohm. Phase wraps from -176.7 to 177.8 deg, median -55.41 deg. That suggests noisy or unresolved low-frequency points, and the low-end |Z| is far below later opens in the MOhm range. It is the first of four quick opencal attempts that evening and is the least trustworthy of them.","exclude_reason":null,"confidence":0.7,"zat":[null,[14533.9,-37.06],[5083.54,-18.05],[3471.89,-83.37],null],"z1k":3471.89,"spark":[3.841,3.686,2.974,4.123,4.179,3.561,3.573,3.739,3.769,3.512,3.548,3.795,3.9,3.261,3.781,3.451,3.799,3.657,3.517,3.377,3.241,3.108,2.974,2.862],"stats":{"zmax":37795.7,"zmin":728.563,"ph_min":-176.687,"f_ph_min":80.0248,"f_peak":133.053,"zi_peak":30414.9,"r_lo":-6543.74,"r_hi":385.866}},{"file_id":143,"path":"csv_archive/saltysoil_eis.csv","filename":"saltysoil_eis.csv","mtime":1786320000.0,"saved_at":"2026-08-09 19:42","kind":"eis","board":"ads1256","n_points":25,"f_lo_hz":0.968113,"f_hi_hz":5475.9,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":342.0,"median_phase_raw_deg":-23.2137,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"salty","summary":"This is salty soil on the ads1256 with a 100 ohm shunt, a 25-point sweep from 0.968 Hz to 5476 Hz. Raw |Z| goes from 520 ohm at the low end to 90.63 ohm at the high end. Median phase is -23.21 deg. Low impedance and moderate capacitive phase fit well-salted moist soil. It comes later on 2026-08-09, after the salt-addition series, and the impedance is consistent with heavily salted soil.","exclude_reason":null,"confidence":0.85,"zat":[[517.034,-29.94],[493.241,-21.86],[351.721,-24.69],[169.217,-3.903],null],"z1k":169.217,"spark":[2.712,2.734,2.732,2.676,2.963,2.714,2.701,2.667,2.65,2.628,2.6,2.622,2.582,2.483,2.41,2.355,2.297,2.251,2.214,2.278,2.239,2.301,2.38,2.475],"stats":{"zmax":1064.25,"zmin":160.752,"ph_min":-36.0024,"f_ph_min":2.82084,"f_peak":4.04577,"zi_peak":581.457,"r_lo":443.457,"r_hi":258.289}},{"file_id":57,"path":"csv_archive/MEGAtest_eis.csv","filename":"MEGAtest_eis.csv","mtime":1786310000.0,"saved_at":"2026-08-09 17:16","kind":"eis","board":"ads1256","n_points":213,"f_lo_hz":542.659,"f_hi_hz":5499.51,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":1193.49,"median_phase_raw_deg":-34.1442,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"test","condition":null,"summary":"This is a long 213-point test sweep from 542.7 Hz to 5.5 kHz on the ads1256 with a 100 ohm shunt. The name doesn't say what was on the terminals. Raw |Z| falls from 1910 ohm to 631.7 ohm, and median phase is -34.14 deg. That looks more like soil or electrodes in a medium than a resistor. With no tag and an uninformative name, I've only labelled it a generic test; don't use it as a reference.","exclude_reason":null,"confidence":0.4,"zat":[null,null,null,[1994.35,0.07197],null],"z1k":1994.35,"spark":[3.322,3.236,3.302,3.302,3.325,3.303,3.3,3.147,3.264,3.316,3.299,3.285,3.26,3.293,3.347,3.305,3.314,3.275,3.296,3.307,3.286,3.299,3.28,3.318],"stats":{"zmax":2777.07,"zmin":1002.76,"ph_min":-9.85547,"f_ph_min":1128.16,"f_peak":1128.16,"zi_peak":475.333,"r_lo":2097.81,"r_hi":2078.1}},{"file_id":166,"path":"csv_archive/testresisator_eis.csv","filename":"testresisator_eis.csv","mtime":1786310000.0,"saved_at":"2026-08-09 16:32","kind":"eis","board":"ads1256","n_points":29,"f_lo_hz":777.894,"f_hi_hz":1099.87,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":1695.88,"median_phase_raw_deg":-24.0036,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"resistor","condition":null,"summary":"This is a resistor of unstated value ('resisator' is a typo) on the ads1256 with a 100 ohm shunt. The sweep is narrow, 777.9 to 1100 Hz. Raw |Z| rises from 1225 to 1679 ohm, median 1696 ohm. Median phase is -24.0 deg, which is more capacitive than a plain resistor should be, so the setup was probably not clean. It is a quick test with no value, on the old hardware, so it is not usable as a calibration standard.","exclude_reason":"ads1256 board; no value stated ('testresisator'); median phase -24.0 deg is too capacitive for a clean resistor","confidence":0.5,"zat":[null,null,null,[2611.37,12.9],null],"z1k":2611.37,"spark":[3.447,3.422,3.591,3.588,3.569,3.546,3.365,3.519,3.384,3.511,3.293,3.381,3.454,3.449,3.421,3.418,3.414,3.417,3.418,3.415,3.414,3.343,3.376,3.418],"stats":{"zmax":3916.25,"zmin":1929.43,"ph_min":-3.72702,"f_ph_min":797.517,"f_peak":797.517,"zi_peak":252.716,"r_lo":2792.96,"r_hi":2557.29}},{"file_id":56,"path":"csv_archive/700to1000openair_eis.csv","filename":"700to1000openair_eis.csv","mtime":1786300000.0,"saved_at":"2026-08-09 14:27","kind":"eis","board":"ads1256","n_points":33,"f_lo_hz":792.422,"f_hi_hz":999.843,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":2016.82,"median_phase_raw_deg":-80.015,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"This is an open-air sweep (probes in air) over a narrow 792.4 to 999.8 Hz band on the ads1256 with a 100 ohm shunt. Raw |Z| stays around 1844 to 1940 ohm, median 2017 ohm. Median phase is -80.02 deg, which fits stray capacitance at the front-end ceiling. That is what an open circuit should look like. It is a short fixture or open check from the 2026-08-09 session.","exclude_reason":null,"confidence":0.85,"zat":[null,null,null,null,null],"z1k":null,"spark":[3.614,3.728,3.717,3.616,3.695,3.689,3.67,3.556,3.638,3.453,3.481,3.575,3.564,3.42,3.524,3.558,3.519,3.464,3.517,3.501,3.484,3.295,3.472,3.469],"stats":{"zmax":5397.42,"zmin":1798.75,"ph_min":-61.8068,"f_ph_min":797.87,"f_peak":797.87,"zi_peak":4757.07,"r_lo":3522.76,"r_hi":2218.85}},{"file_id":35,"path":"csv_archive/10ufcapacitor_eis.csv","filename":"10ufcapacitor_eis.csv","mtime":1786300000.0,"saved_at":"2026-08-09 14:25","kind":"eis","board":"ads1256","n_points":45,"f_lo_hz":0.107272,"f_hi_hz":5500.07,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":435.149,"median_phase_raw_deg":-81.9347,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"capacitor","condition":null,"summary":"This is a 10 uF capacitor on the ads1256 with a 100 ohm shunt. Raw |Z| falls from 82730 ohm at 0.107 Hz to 6.104 ohm at 5.5 kHz, roughly as 1/f, as a capacitor should. Median phase is -81.93 deg, reaching -88.34 deg. That is close to an ideal capacitor, with the phase easing to -27.09 deg at the extreme end. The name and the data agree well, so it is a trustworthy capacitor reference for the old rig.","exclude_reason":null,"confidence":0.9,"zat":[[16948.6,-79.91],[2359.11,-93.96],[218.323,-78.39],[33.1533,-32.53],null],"z1k":33.1533,"spark":[4.915,4.823,4.672,4.527,4.39,4.187,4.009,3.814,3.555,3.13,3.508,2.994,2.875,2.618,2.442,2.167,1.967,1.786,1.644,1.649,1.43,1.412,1.425,1.475],"stats":{"zmax":82248.2,"zmin":25.6446,"ph_min":-115.078,"f_ph_min":1.38812,"f_peak":0.183312,"zi_peak":43819.9,"r_lo":72896.3,"r_hi":29.3927}},{"file_id":91,"path":"csv_archive/moredetail90to1000_eis.csv","filename":"moredetail90to1000_eis.csv","mtime":1786300000.0,"saved_at":"2026-08-09 14:12","kind":"eis","board":"ads1256","n_points":242,"f_lo_hz":143.594,"f_hi_hz":1000.01,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":341.915,"median_phase_raw_deg":-42.7367,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"salted wet soil (inferred from session)","summary":"This is a detailed 242-point sweep from 143.6 Hz to 1 kHz on the ads1256 with a 100 ohm shunt. The name doesn't say what was measured. Raw |Z| goes from 607.6 ohm down to 188.6 ohm, and median phase is -42.74 deg. That fits soil much better than a resistor. It was saved 16 minutes after the saltiest soil run, so it is probably a close-up of the same salted soil, but that is inferred. Treat the medium as uncertain.","exclude_reason":null,"confidence":0.5,"zat":[null,null,null,[286.198,3.426],null],"z1k":286.198,"spark":[2.798,2.77,2.75,2.73,2.714,2.697,2.674,2.657,2.601,2.606,2.606,2.605,2.599,2.542,2.545,2.541,2.535,2.502,2.629,2.706,2.724,2.652,2.553,2.457],"stats":{"zmax":627.683,"zmin":286.192,"ph_min":-39.2158,"f_ph_min":143.594,"f_peak":143.594,"zi_peak":396.848,"r_lo":486.31,"r_hi":285.679}},{"file_id":173,"path":"csv_archive/testwetrsoil15-pplusevenmoresalt_eis.csv","filename":"testwetrsoil15-pplusevenmoresalt_eis.csv","mtime":1786300000.0,"saved_at":"2026-08-09 13:56","kind":"eis","board":"ads1256","n_points":124,"f_lo_hz":0.107394,"f_hi_hz":5000.35,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":723.086,"median_phase_raw_deg":-31.5952,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"wet, even more salt","summary":"This is wet soil after even more salt, on the ads1256 with a 100 ohm shunt. 'wetrsoil15-p' is a typo for the earlier 'wetsoil150p'. Raw |Z| falls again, to 5130 ohm at the low end and 91.27 ohm at 5 kHz, and median phase is -31.6 deg. Impedance keeps dropping with each salt step, which is consistent. It is the third and saltiest step of the 2026-08-09 series.","exclude_reason":null,"confidence":0.8,"zat":[[1152.17,-16.56],[2833.1,-44.93],[732.697,-31.65],[275.337,0.584],null],"z1k":275.337,"spark":[3.708,3.609,3.511,3.467,2.979,2.822,3.332,3.348,3.215,3.205,3.295,3.078,3.252,2.912,2.892,2.765,2.646,2.533,2.478,2.66,2.445,2.499,2.55,2.625],"stats":{"zmax":5100.28,"zmin":269.915,"ph_min":-52.4123,"f_ph_min":0.856621,"f_peak":1.40075,"zi_peak":3824.1,"r_lo":5003.98,"r_hi":379.504}},{"file_id":175,"path":"csv_archive/testwetsoil150pandalsosomesalt_eis.csv","filename":"testwetsoil150pandalsosomesalt_eis.csv","mtime":1786300000.0,"saved_at":"2026-08-09 13:39","kind":"eis","board":"ads1256","n_points":124,"f_lo_hz":0.107315,"f_hi_hz":4999.53,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":1307.01,"median_phase_raw_deg":-31.4377,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"wet, 150p, some salt added","summary":"This is the same wet soil with some salt added, on the ads1256 with a 100 ohm shunt. Raw |Z| has fallen to 10870 ohm at 0.107 Hz and 263.5 ohm at 5 kHz, down from 17390 and 335 ohm before the salt. Median phase is -31.44 deg. Lower impedance after adding salt is what you'd expect. It is the second step of the salt series and is consistent with its neighbours.","exclude_reason":null,"confidence":0.8,"zat":[[5562.93,-19.86],[5796.05,-49.16],[1474.13,-29.81],[749.947,4.359],null],"z1k":749.947,"spark":[4.034,3.924,3.863,3.832,3.776,3.738,2.926,3.491,3.588,3.493,3.605,3.386,3.445,3.249,3.162,3.002,2.978,2.896,2.857,3.067,2.879,2.969,3.032,3.086],"stats":{"zmax":11617.5,"zmin":551.11,"ph_min":-57.2894,"f_ph_min":0.855251,"f_peak":1.40176,"zi_peak":9285.66,"r_lo":10605.0,"r_hi":1174.8}},{"file_id":174,"path":"csv_archive/testwetsoil150p_eis.csv","filename":"testwetsoil150p_eis.csv","mtime":1786300000.0,"saved_at":"2026-08-09 13:29","kind":"eis","board":"ads1256","n_points":124,"f_lo_hz":0.107362,"f_hi_hz":5000.18,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":1655.45,"median_phase_raw_deg":-34.3512,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"wet, 150p","summary":"This is wet soil on the ads1256 with a 100 ohm shunt, swept from 0.107 Hz to 5 kHz. I can't decode the '150p' in the name; it might be a point count, but the file has 124 points. Raw |Z| goes from 17390 ohm at the low end to 335 ohm at the high end. Median phase is -34.35 deg, with a few points up to +26.57 deg. That fits soil with low-frequency electrode polarisation. It is the baseline before the salt additions that follow.","exclude_reason":null,"confidence":0.75,"zat":[[2366.12,0.836],[4583.36,-51.04],[2099.55,-31.04],[1136.39,1.477],null],"z1k":1136.39,"spark":[4.238,4.161,4.067,4.031,3.927,2.874,3.816,3.852,3.724,3.129,3.734,3.523,3.593,3.369,3.336,3.202,2.971,3.086,3.04,3.257,3.056,3.123,3.162,3.19],"stats":{"zmax":17286.5,"zmin":535.572,"ph_min":-61.156,"f_ph_min":1.46023,"f_peak":1.46023,"zi_peak":14942.8,"r_lo":16829.7,"r_hi":1531.45}},{"file_id":176,"path":"csv_archive/testwetsoil_eis.csv","filename":"testwetsoil_eis.csv","mtime":1786300000.0,"saved_at":"2026-08-09 13:20","kind":"eis","board":"ads1256","n_points":325,"f_lo_hz":50.9552,"f_hi_hz":5994.6,"fs_hz":null,"r_shunt_ohm":100.0,"shunts":"100","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":849.948,"median_phase_raw_deg":-35.9107,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"wet","summary":"This is wet soil on the ads1256 rig. The shunt has changed to 100 ohm, and the sweep only covers 50.96 Hz to 5995 Hz over 325 points. Raw |Z| falls from 1837 ohm to 313.7 ohm, and median phase is -35.91 deg, which fits moist soil. It is far below the dry-soil run the day before, though that run used a different shunt. It opens the 2026-08-09 wet-soil and salt series. It looks like a reasonable soil measurement despite the 'test' prefix.","exclude_reason":null,"confidence":0.8,"zat":[null,null,[1865.42,-26.99],[1111.03,2.595],null],"z1k":1111.03,"spark":[3.341,3.227,3.372,3.299,3.167,3.184,3.131,3.126,3.099,3.055,2.975,2.961,2.995,3.261,3.04,3.006,3.073,3.081,3.12,3.119,3.152,3.182,3.196,3.203],"stats":{"zmax":2802.47,"zmin":672.761,"ph_min":-39.7461,"f_ph_min":72.3662,"f_peak":77.6343,"zi_peak":1524.37,"r_lo":2183.17,"r_hi":1585.7}},{"file_id":73,"path":"csv_archive/drysoil_eis.csv","filename":"drysoil_eis.csv","mtime":1786220000.0,"saved_at":"2026-08-08 15:44","kind":"eis","board":"ads1256","n_points":87,"f_lo_hz":0.107526,"f_hi_hz":10000.0,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":1,"open_applied":1,"array_type":null,"median_zmag_raw":15121.7,"median_phase_raw_deg":-46.9296,"frac_open":0.0344828,"temp_c":null,"medium_tag":"soil","notes_tag":"","category":"soil","condition":"dry","summary":"Dry soil on the Wenner array with a 1000 ohm shunt, a 47-point multitone sweep taken four minutes after the single-point dryishsoil run. Raw |Z| is 167.6 ohm at 4 Hz and 138.4 ohm at 27 kHz (median 168.1 ohm), only a slight drop across the band. The phase is mostly near zero (median -0.709 deg, minimum -12.74 deg), so little electrode polarisation shows. The 'soil' tag agrees with the name. A reasonable soil record of the dry state.","exclude_reason":null,"confidence":0.8,"zat":[[333087.0,174.4],[348611.0,24.33],[51210.2,-1.759],[17807.0,-130.1],null],"z1k":17807.0,"spark":[5.534,5.532,5.308,4.36,3.585,5.541,5.555,5.554,4.934,4.99,5.576,4.977,5.077,4.722,4.815,5.746,4.014,5.464,3.962,4.267,5.087,5.055,5.021,3.891],"stats":{"zmax":589521.0,"zmin":1876.22,"ph_min":-179.978,"f_ph_min":1.9685,"f_peak":1555.45,"zi_peak":247918.0,"r_lo":-342176.0,"r_hi":5581.53}},{"file_id":36,"path":"csv_archive/1413knownupdatedcalibration_eis.csv","filename":"1413knownupdatedcalibration_eis.csv","mtime":1786220000.0,"saved_at":"2026-08-08 15:26","kind":"eis","board":"ads1256","n_points":10,"f_lo_hz":0.107509,"f_hi_hz":10000.0,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":1,"open_applied":1,"array_type":null,"median_zmag_raw":2051.57,"median_phase_raw_deg":-10.9434,"frac_open":0.1,"temp_c":null,"medium_tag":"","notes_tag":"","category":"conductivity_standard","condition":"1413 uS/cm, check of updated calibration","summary":"This is the 1413 uS/cm standard again on the ads1256 with a 470 ohm shunt, saved two hours after the first 1413 run. Going by the name, it checks an updated calibration. It is a short 10-point sweep: raw |Z| goes from 3615 ohm at the low end to 725.2 ohm at 10 kHz, and median phase is -10.94 deg. Both closely match the earlier 1413 run. One point in ten is unresolved. It is a calibration check, not a reference.","exclude_reason":null,"confidence":0.85,"zat":[[2666.03,-12.36],[2235.69,-9.675],[1766.72,-3.813],[1841.26,12.19],null],"z1k":1841.26,"spark":[3.573,3.429,3.285,3.323,3.373,3.423,3.442,3.422,3.402,3.38,3.356,3.332,3.309,3.287,3.266,3.252,3.242,3.231,3.235,3.244,3.252,3.272,3.293,3.314],"stats":{"zmax":3737.37,"zmin":1694.16,"ph_min":-17.7173,"f_ph_min":0.267729,"f_peak":0.267729,"zi_peak":573.701,"r_lo":3701.55,"r_hi":1796.9}},{"file_id":37,"path":"csv_archive/1413uScmknownsample_eis.csv","filename":"1413uScmknownsample_eis.csv","mtime":1786210000.0,"saved_at":"2026-08-08 13:27","kind":"eis","board":"ads1256","n_points":87,"f_lo_hz":0.107519,"f_hi_hz":10000.0,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":1,"open_applied":1,"array_type":null,"median_zmag_raw":1700.27,"median_phase_raw_deg":-13.749,"frac_open":0.0344828,"temp_c":null,"medium_tag":"","notes_tag":"","category":"conductivity_standard","condition":"1413 uS/cm known sample","summary":"This is a 1413 uS/cm conductivity standard solution, measured on the old ads1256 rig with a 470 ohm shunt. Raw |Z| drops from 3665 ohm at 0.1075 Hz to 578 ohm at 10 kHz, with a median of 1700 ohm. Phase runs from -27.26 to -0.33 deg (median -13.75). That fits an ionic solution with some electrode polarisation at low frequency. Only 3.4% of points are unresolved. It is the first run of the 2026-08-08 session and a trustworthy reference for the old hardware only.","exclude_reason":null,"confidence":0.9,"zat":[[3169.85,-13.19],[2330.81,-12.74],[1746.24,-7.543],[1635.25,10.2],null],"z1k":1635.25,"spark":[3.579,3.588,3.369,3.528,3.358,3.496,3.433,3.441,3.409,3.347,3.343,3.264,3.292,3.263,3.246,3.216,3.175,3.19,3.18,3.208,3.203,3.275,3.381,3.344],"stats":{"zmax":3882.68,"zmin":1393.99,"ph_min":-24.0792,"f_ph_min":0.692878,"f_peak":0.692878,"zi_peak":742.515,"r_lo":3734.76,"r_hi":1704.04}},{"file_id":39,"path":"csv_archive/1413uscmknownsample_eis.csv","filename":"1413uscmknownsample_eis.csv","mtime":1786210000.0,"saved_at":"2026-08-08 12:57","kind":"eis","board":"ads1256","n_points":87,"f_lo_hz":0.107496,"f_hi_hz":10000.0,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":1,"array_type":null,"median_zmag_raw":1785.0,"median_phase_raw_deg":-15.5876,"frac_open":0.0344828,"temp_c":null,"medium_tag":"","notes_tag":"","category":"conductivity_standard","condition":"1413 uS/cm","summary":"A 1413 uS/cm conductivity standard ('known sample') on the ads1256 rig, saved with the open correction active just after the six opencal sweeps: 87 points from 0.1075 to 10000 Hz. Raw |Z| falls from 4252 ohm at the low end to 567.8 ohm at the high end (median 1785). The median phase is -15.59 deg (range -27.11 to 10.38), the mild behaviour of an ionic solution. That is somewhat higher than the 2026-08-03 run of the same standard (3306 ohm low end, median 1340), possibly from a different fill or electrode depth. It is a trustworthy check of the standard on the old board.","exclude_reason":null,"confidence":0.9,"zat":[[3310.77,-11.74],[2483.14,-15.53],[1721.28,-9.661],[1599.38,9.498],null],"z1k":1599.38,"spark":[3.642,3.63,3.607,3.374,3.467,3.534,3.507,3.483,3.432,3.414,3.376,3.335,3.291,3.278,3.242,3.22,3.197,3.117,3.192,3.2,3.202,3.253,3.361,3.335],"stats":{"zmax":4381.56,"zmin":1285.02,"ph_min":-27.2219,"f_ph_min":3.98805,"f_peak":0.326297,"zi_peak":1144.49,"r_lo":4331.32,"r_hi":1731.11}},{"file_id":103,"path":"csv_archive/opencal_20260808_122039_eis.csv","filename":"opencal_20260808_122039_eis.csv","mtime":1786210000.0,"saved_at":"2026-08-08 12:26","kind":"eis","board":"ads1256","n_points":87,"f_lo_hz":0.107568,"f_hi_hz":10000.0,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":14325.7,"median_phase_raw_deg":-44.7503,"frac_open":0.0344828,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"The sixth and last open-circuit calibration sweep on the ads1256 rig, taken just before the 1413 uS/cm check: 87 points from 0.1076 to 10000 Hz. Raw |Z| goes from 142300 ohm at the low end to 620.7 ohm at the high end (median 14330), with a median phase of -44.75 deg (range -82.04 to 65.22). 3.4% of points are unresolved. It agrees closely with the two earlier 10 kHz opens. It is probably the open correction applied to the next run (open_applied=1 there), and a valid open record for the old board.","exclude_reason":null,"confidence":0.85,"zat":[[52697.7,16.41],[104978.0,-40.79],[13620.6,-63.37],[1762.25,-64.44],null],"z1k":1762.25,"spark":[5.153,5.152,4.559,4.469,5.148,4.602,3.619,5.136,4.266,5.057,4.96,4.817,4.39,4.262,4.242,4.048,3.847,3.445,3.439,3.24,3.073,2.935,2.852,2.793],"stats":{"zmax":142252.0,"zmin":620.692,"ph_min":-82.0392,"f_ph_min":191.833,"f_peak":11.4214,"zi_peak":69594.0,"r_lo":142247.0,"r_hi":585.21}},{"file_id":102,"path":"csv_archive/opencal_20260808_120056_eis.csv","filename":"opencal_20260808_120056_eis.csv","mtime":1786210000.0,"saved_at":"2026-08-08 12:06","kind":"eis","board":"ads1256","n_points":87,"f_lo_hz":0.107656,"f_hi_hz":10000.0,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":13261.3,"median_phase_raw_deg":-43.178,"frac_open":0.0344828,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"The fifth open-circuit calibration sweep on the ads1256 rig: 87 points from 0.1077 to 10000 Hz. Raw |Z| goes from 142200 ohm at the low end to 647.3 ohm at the high end (median 13260), with a median phase of -43.18 deg. The phase maximum of 75.07 deg shows a few noisy points, and 3.4% of points are unresolved. It closely repeats the 10:33 open at the low end. It is a valid open record for the old board.","exclude_reason":null,"confidence":0.85,"zat":[[134397.0,-8.983],[48333.9,-23.36],[15386.4,-59.27],[1801.39,-67.06],null],"z1k":1801.39,"spark":[5.153,4.432,4.213,5.152,5.111,4.117,5.144,5.136,5.112,4.766,4.825,4.55,4.642,4.16,4.208,3.986,3.846,3.648,3.443,3.245,3.076,2.939,2.849,2.811],"stats":{"zmax":142162.0,"zmin":626.985,"ph_min":-82.7463,"f_ph_min":151.854,"f_peak":14.3086,"zi_peak":69542.8,"r_lo":142157.0,"r_hi":608.977}},{"file_id":101,"path":"csv_archive/opencal_20260808_103358_eis.csv","filename":"opencal_20260808_103358_eis.csv","mtime":1786200000.0,"saved_at":"2026-08-08 10:39","kind":"eis","board":"ads1256","n_points":87,"f_lo_hz":0.107564,"f_hi_hz":10000.0,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":11786.2,"median_phase_raw_deg":-46.3863,"frac_open":0.0344828,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"The fourth open-circuit calibration sweep on the ads1256 rig, now extended to 10000 Hz (87 points from 0.1076 Hz). Raw |Z| goes from 142100 ohm at the low end to 635.0 ohm at the high end (median 11790), with a median phase of -46.39 deg (range -83.62 to 54.46). 3.4% of points are unresolved. It is the first of three opens with a 10 kHz band, and those three agree closely at the low end (142100-142300 ohm). It is a reasonably repeatable open record for the old board.","exclude_reason":null,"confidence":0.85,"zat":[[140782.0,-7.695],[36098.0,-44.15],[14740.9,-50.88],[1784.59,-65.62],null],"z1k":1784.59,"spark":[5.153,5.153,5.136,4.206,5.137,5.147,5.146,5.13,5.114,4.624,4.966,4.533,4.383,4.46,4.116,4.057,3.852,3.642,3.431,3.246,3.081,2.939,2.848,2.803],"stats":{"zmax":145899.0,"zmin":634.983,"ph_min":-83.6198,"f_ph_min":151.727,"f_peak":12.7993,"zi_peak":69665.3,"r_lo":142132.0,"r_hi":589.87}},{"file_id":100,"path":"csv_archive/opencal_20260808_090043_eis.csv","filename":"opencal_20260808_090043_eis.csv","mtime":1786200000.0,"saved_at":"2026-08-08 09:06","kind":"eis","board":"ads1256","n_points":86,"f_lo_hz":0.107633,"f_hi_hz":6975.29,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":13047.6,"median_phase_raw_deg":-51.8258,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"The third open-circuit calibration sweep on the ads1256 rig: 86 points from 0.1076 to 6975 Hz. Raw |Z| reaches 245500 ohm at the low end, far above the two previous opens (68560 and 30390 ohm), and falls to 633.8 ohm at the high end (median 13050). The median phase is -51.83 deg (range -85.3 to 53.52). The high end is consistent across all the opens, but the low end varies widely, which shows how poorly the board resolves very high impedance. It is valid as an open record for the old board only.","exclude_reason":null,"confidence":0.85,"zat":[[60415.1,12.87],[133452.0,-56.36],[14320.1,-59.09],[1791.95,-70.05],null],"z1k":1791.95,"spark":[5.39,5.39,5.393,5.388,5.387,3.83,5.19,4.714,4.94,5.182,4.783,4.853,4.658,4.408,4.112,4.053,3.742,3.644,3.438,3.248,3.077,2.938,2.849,2.802],"stats":{"zmax":247575.0,"zmin":633.793,"ph_min":-85.2999,"f_ph_min":135.472,"f_peak":7.05238,"zi_peak":121434.0,"r_lo":245435.0,"r_hi":591.857}},{"file_id":99,"path":"csv_archive/opencal_20260808_085433_eis.csv","filename":"opencal_20260808_085433_eis.csv","mtime":1786200000.0,"saved_at":"2026-08-08 09:00","kind":"eis","board":"ads1256","n_points":86,"f_lo_hz":0.0939956,"f_hi_hz":6964.61,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":12268.5,"median_phase_raw_deg":-49.3345,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"The second open-circuit calibration sweep on the ads1256 rig, 7 minutes after the first: 86 points from 0.094 to 6965 Hz. Raw |Z| goes from 30390 ohm at the low end to 645.6 ohm at the high end (median 12270), with a median phase of -49.33 deg. The low end is less than half the first run's 68560 ohm, and the phase maximum of 165.6 deg indicates some wrapped points. Open sweeps on this board are not very repeatable at low frequency. It is valid as an open record for the old board only.","exclude_reason":null,"confidence":0.85,"zat":[[130715.0,12.8],[132898.0,-56.63],[11584.0,-54.37],[1794.58,-68.72],null],"z1k":1794.58,"spark":[4.483,5.15,4.894,5.192,5.388,5.213,3.943,5.351,4.916,4.58,4.949,4.783,4.685,4.563,4.15,4.074,3.842,3.657,3.455,3.257,3.072,2.943,2.853,2.81],"stats":{"zmax":245611.0,"zmin":636.963,"ph_min":-83.666,"f_ph_min":169.697,"f_peak":6.23889,"zi_peak":121865.0,"r_lo":29181.4,"r_hi":606.35}},{"file_id":98,"path":"csv_archive/opencal_20260808_084735_eis.csv","filename":"opencal_20260808_084735_eis.csv","mtime":1786200000.0,"saved_at":"2026-08-08 08:53","kind":"eis","board":"ads1256","n_points":86,"f_lo_hz":0.102309,"f_hi_hz":6929.21,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":0,"array_type":null,"median_zmag_raw":16009.2,"median_phase_raw_deg":-50.2805,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"open","condition":null,"summary":"An open-circuit calibration sweep on the ads1256 rig, the first of six opencal runs on 2026-08-08: 86 points from 0.1023 to 6929 Hz. Raw |Z| falls from 68560 ohm at the low end to 626.6 ohm at the high end (median 16010), with a median phase of -50.28 deg (range -84.28 to 43.45), the stray capacitance of the open leads. All points resolved. Note that this signature is nearly identical to the dry-soil runs on this board, so those soils were close to the open ceiling. It is a valid open sweep for the old board only.","exclude_reason":null,"confidence":0.85,"zat":[[104423.0,6.388],[133469.0,-56.36],[15305.9,-56.87],[1783.74,-69.71],null],"z1k":1783.74,"spark":[4.836,5.303,5.376,5.386,5.388,5.37,5.367,5.131,5.293,5.187,4.919,4.661,4.401,4.464,4.13,4.064,3.779,3.648,3.446,3.251,3.083,2.937,2.852,2.797],"stats":{"zmax":248274.0,"zmin":626.61,"ph_min":-84.2791,"f_ph_min":212.594,"f_peak":6.96164,"zi_peak":122258.0,"r_lo":30736.5,"r_hi":590.882}},{"file_id":151,"path":"csv_archive/test4-6cm_eis.csv","filename":"test4-6cm_eis.csv","mtime":1786020000.0,"saved_at":"2026-08-06 07:23","kind":"eis","board":"ads1256","n_points":45,"f_lo_hz":0.107457,"f_hi_hz":6877.15,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":1428.43,"median_phase_raw_deg":-15.1841,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"other","condition":"electrode spacing 6 cm","summary":"Run 4, the last of the electrode-spacing series on the ads1256 rig ('6cm'), saved with a calibration active. It has 45 points from 0.1075 to 6877 Hz. Raw |Z| falls from 2922 ohm at the low end to 485.5 ohm at the high end (median 1428), with a median phase of -15.18 deg (range -26.55 to -3.357). That is water-like or wet-soil-like. It falls between the 2 cm and 4 cm readings rather than following spacing in order. The medium is not stated, so the category is left open.","exclude_reason":null,"confidence":0.4,"zat":[[2226.64,-10.71],[1812.37,-14.87],[1207.18,-23.69],[612.861,-20.24],null],"z1k":612.861,"spark":[3.469,3.403,3.304,3.204,3.359,3.328,3.322,3.304,3.288,3.265,3.243,3.218,3.185,3.145,3.094,3.014,2.967,2.901,2.844,2.787,2.741,2.702,2.68,2.685],"stats":{"zmax":2944.22,"zmin":476.513,"ph_min":-26.8657,"f_ph_min":181.35,"f_peak":72.9952,"zi_peak":534.887,"r_lo":2895.34,"r_hi":482.432}},{"file_id":150,"path":"csv_archive/test3-4cm_eis.csv","filename":"test3-4cm_eis.csv","mtime":1786020000.0,"saved_at":"2026-08-06 07:19","kind":"eis","board":"ads1256","n_points":45,"f_lo_hz":0.107461,"f_hi_hz":6881.95,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":787.386,"median_phase_raw_deg":-6.64397,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"other","condition":"electrode spacing 4 cm","summary":"Run 3 of the electrode-spacing series on the ads1256 rig ('4cm'), saved with a calibration active. It has 45 points from 0.1075 to 6882 Hz. Raw |Z| goes from 911.8 ohm at the low end to 457.2 ohm at the high end (median 787.4), with a mild median phase of -6.644 deg (range -14.63 to 0.5967). That is much lower than both the 2 cm run (3620 ohm) and the 6 cm run (2922 ohm), so the spacing trend is not monotonic. Possibly a contact or placement change. The medium is not stated, so trust is low.","exclude_reason":null,"confidence":0.4,"zat":[[923.518,-4.716],[863.389,-5.436],[733.72,-12.38],[507.048,-11.83],null],"z1k":507.048,"spark":[2.963,2.953,2.881,2.894,2.966,2.962,2.955,2.951,2.949,2.941,2.935,2.919,2.911,2.889,2.871,2.842,2.814,2.778,2.74,2.705,2.681,2.658,2.653,2.659],"stats":{"zmax":959.74,"zmin":448.847,"ph_min":-14.5834,"f_ph_min":227.534,"f_peak":227.534,"zi_peak":165.246,"r_lo":918.63,"r_hi":455.819}},{"file_id":146,"path":"csv_archive/test2-2cm_eis.csv","filename":"test2-2cm_eis.csv","mtime":1786020000.0,"saved_at":"2026-08-06 07:15","kind":"eis","board":"ads1256","n_points":45,"f_lo_hz":0.105351,"f_hi_hz":6871.29,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":1,"open_applied":0,"array_type":null,"median_zmag_raw":2144.86,"median_phase_raw_deg":-19.5627,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"other","condition":"electrode spacing 2 cm","summary":"Run 2 of a short electrode-spacing series on the ads1256 rig ('2cm'), saved with a calibration active and no open correction. It has 45 points from 0.1054 to 6871 Hz. Raw |Z| falls from 3620 ohm at the low end to 525.1 ohm at the high end (median 2145), with a median phase of -19.56 deg (range -33.75 to 9.514). That looks like water or wet soil, but the medium is not stated, so the category is left open. The 4 cm and 6 cm runs follow within 8 minutes. Trust is low for the medium.","exclude_reason":null,"confidence":0.4,"zat":[[3022.73,-8.938],[2841.66,-15.41],[1923.17,-25.25],[853.042,-32.36],null],"z1k":853.042,"spark":[3.562,3.511,3.41,3.301,3.467,3.479,3.453,3.467,3.407,3.459,3.442,3.397,3.394,3.336,3.293,3.248,3.182,3.101,3.002,2.931,2.846,2.779,2.735,2.719],"stats":{"zmax":3647.8,"zmin":523.595,"ph_min":-33.5839,"f_ph_min":889.646,"f_peak":45.4705,"zi_peak":897.616,"r_lo":3647.51,"r_hi":514.559}},{"file_id":152,"path":"csv_archive/test470ohmresistor_eis.csv","filename":"test470ohmresistor_eis.csv","mtime":1785980000.0,"saved_at":"2026-08-05 20:09","kind":"eis","board":"ads1256","n_points":86,"f_lo_hz":0.107529,"f_hi_hz":6857.42,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":1,"open_applied":null,"array_type":null,"median_zmag_raw":467.935,"median_phase_raw_deg":0.14926,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"resistor","condition":null,"summary":"A 470 ohm resistor on the ads1256 rig with a 470 ohm shunt: 86 points from 0.1075 to 6857 Hz. The data is textbook resistor behaviour. Raw |Z| is 469.0 ohm at the low end and 468.0 ohm at the high end (median 467.9), and the phase stays between -0.9329 and 2.33 deg (median 0.1493 deg). The value in the name is confirmed by the data. However, the run was saved with a calibration active and carries a 'test' prefix, so it looks like a check. It is also on the old ads1256 board, whose calibration does not carry over, so it is not a calibration standard.","exclude_reason":"ads1256 board (incompatible calibration); 'test' prefix with cal_applied=1 suggests a calibration check; DUT equals the 470 ohm shunt.","confidence":0.92,"zat":[[470.127,-0.219],[466.036,0.5295],[472.338,-0.8631],[462.12,0.3755],null],"z1k":462.12,"spark":[2.674,2.674,2.42,2.664,2.672,2.672,2.671,2.67,2.674,2.671,2.672,2.666,2.668,2.668,2.672,2.663,2.668,2.669,2.67,2.665,2.667,2.669,2.669,2.669],"stats":{"zmax":478.182,"zmin":242.972,"ph_min":-14.0884,"f_ph_min":0.262857,"f_peak":0.262857,"zi_peak":59.144,"r_lo":472.603,"r_hi":466.602}},{"file_id":177,"path":"csv_archive/testwithoutcontmode_eis.csv","filename":"testwithoutcontmode_eis.csv","mtime":1785970000.0,"saved_at":"2026-08-05 19:07","kind":"eis","board":"ads1256","n_points":4,"f_lo_hz":3479.43,"f_hi_hz":6883.0,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":735.791,"median_phase_raw_deg":-36.252,"frac_open":0.5,"temp_c":null,"medium_tag":"","notes_tag":"","category":"test","condition":null,"summary":"A software or mode test on the ads1256 rig ('without cont mode', probably continuous mode switched off). It has only 4 points, from 3479 to 6883 Hz, and half of them (frac_open 0.5) are unresolved. Raw |Z| is 766.2 ohm at the low end and 705.4 ohm at the high end (median 735.8), with a phase between -39.49 and -33.01 deg. Nothing identifies what was on the terminals; the values resemble the high-frequency end of soil runs on this board. It is useful only as a log of the mode test.","exclude_reason":null,"confidence":0.55,"zat":[null,null,null,null,null],"z1k":null,"spark":[2.884,2.883,2.881,2.88,2.878,2.877,2.875,2.873,2.872,2.87,2.869,2.867,2.866,2.864,2.862,2.861,2.859,2.858,2.856,2.855,2.853,2.852,2.85,2.848],"stats":{"zmax":766.203,"zmin":705.38,"ph_min":-39.4932,"f_ph_min":3479.43,"f_peak":3479.43,"zi_peak":487.295,"r_lo":591.279,"r_hi":591.508}},{"file_id":84,"path":"csv_archive/iccROwater_eis.csv","filename":"iccROwater_eis.csv","mtime":1785860000.0,"saved_at":"2026-08-04 11:27","kind":"eis","board":"ads1256","n_points":87,"f_lo_hz":0.091819,"f_hi_hz":10474.6,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":1606.25,"median_phase_raw_deg":-18.5129,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"water","condition":"RO water","summary":"Reverse-osmosis water on the ads1256 rig, the last of the three water comparisons: 87 points from 0.09182 to 10470 Hz. Raw |Z| falls from 5316 ohm at the low end to 589.5 ohm at the high end. Its median of 1606 ohm is the highest of the three waters, which fits the low conductivity of RO water. The phase is tight and mild, between -25.85 and -5.548 deg (median -18.51 deg). This is a clean, trustworthy water record.","exclude_reason":null,"confidence":0.85,"zat":[[3666.23,-14.65],[2581.08,-20.39],[1543.84,-15.05],[1002.42,-22.89],[577.281,-6.795]],"z1k":1002.42,"spark":[3.726,3.704,3.665,3.631,3.623,3.564,3.513,3.513,3.47,3.425,3.359,3.32,3.266,3.206,3.201,3.128,3.097,3.075,3.037,2.959,2.868,2.786,2.75,2.77],"stats":{"zmax":5316.2,"zmin":537.945,"ph_min":-25.8489,"f_ph_min":1647.92,"f_peak":1.27787,"zi_peak":1098.76,"r_lo":5274.63,"r_hi":586.741}},{"file_id":85,"path":"csv_archive/iccbottledwater_eis.csv","filename":"iccbottledwater_eis.csv","mtime":1785860000.0,"saved_at":"2026-08-04 11:14","kind":"eis","board":"ads1256","n_points":87,"f_lo_hz":0.0918206,"f_hi_hz":9941.84,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":858.49,"median_phase_raw_deg":-22.5881,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"water","condition":"bottled water","summary":"Bottled water on the ads1256 rig, the second of the three water comparisons: 87 points from 0.09182 to 9942 Hz. Raw |Z| goes from 6383 ohm at the low end to 405.1 ohm at the high end (median 858.5), sitting between tap water (550.2 median) and RO water (1606 median). The median phase is -22.59 deg (range -45.58 to 11.36), typical of water with electrode polarisation. The ordering across the three waters makes sense, so this is a trustworthy water record.","exclude_reason":null,"confidence":0.85,"zat":[[3906.73,-18.49],[1962.61,-34.66],[694.029,-34.91],[409.953,-9.688],null],"z1k":409.953,"spark":[3.805,3.774,3.712,3.639,3.6,3.558,3.471,3.464,3.393,3.317,3.231,3.137,3.037,2.94,2.858,2.756,2.683,2.653,2.663,2.614,2.598,2.608,2.613,2.608],"stats":{"zmax":6383.35,"zmin":392.31,"ph_min":-45.5773,"f_ph_min":48.3976,"f_peak":2.68599,"zi_peak":1326.32,"r_lo":6351.73,"r_hi":404.956}},{"file_id":88,"path":"csv_archive/icctapwater_eis.csv","filename":"icctapwater_eis.csv","mtime":1785860000.0,"saved_at":"2026-08-04 11:03","kind":"eis","board":"ads1256","n_points":87,"f_lo_hz":0.0918183,"f_hi_hz":9935.94,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":550.197,"median_phase_raw_deg":-22.536,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"water","condition":"tap water","summary":"Tap water on the ads1256 rig, the first of three water comparisons after the ICC dirt series: 87 points from 0.09182 to 9936 Hz. Raw |Z| falls from 4603 ohm at the low end to 345.9 ohm at the high end, with a median of 550.2 ohm, the lowest of the three waters, as expected for the most conductive one. The median phase is -22.54 deg (range -53.22 to 17.3): resistive bulk plus electrode polarisation at low frequency. The data is consistent and trustworthy as a water record.","exclude_reason":null,"confidence":0.85,"zat":[[2422.35,-20.15],[1269.29,-33.09],[487.721,-32.24],[276.612,-7.145],null],"z1k":276.612,"spark":[3.663,3.6,3.543,3.48,3.415,3.372,3.325,3.263,3.201,3.127,3.048,2.958,2.88,2.762,2.668,2.554,2.497,2.463,2.447,2.418,2.435,2.462,2.5,2.539],"stats":{"zmax":4603.29,"zmin":261.017,"ph_min":-53.2239,"f_ph_min":47.8004,"f_peak":1.2981,"zi_peak":880.931,"r_lo":4537.35,"r_hi":338.23}},{"file_id":71,"path":"csv_archive/day2iccdirt5mlwater_eis.csv","filename":"day2iccdirt5mlwater_eis.csv","mtime":1785860000.0,"saved_at":"2026-08-04 10:57","kind":"eis","board":"ads1256","n_points":87,"f_lo_hz":0.0918958,"f_hi_hz":11327.3,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":18044.9,"median_phase_raw_deg":-45.1885,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"icc dirt, day 2, 5 ml water","summary":"The ICC dirt on day 2 at 5 ml of water, the last soil step before the water-only runs, on the ads1256 rig: 87 points from 0.0919 to 11330 Hz. Raw |Z| goes from 54050 ohm at the low end to 614.9 ohm at the high end (median 18040), only slightly below the 2 ml run. The median phase is -45.19 deg (range -83.59 to 35.75). The name does not say whether 5 ml is cumulative or added on top of the 2 ml. It is a trustworthy soil record with a small moisture effect.","exclude_reason":null,"confidence":0.8,"zat":[[161732.0,-0.9927],[27783.9,-16.53],[16124.4,-83.57],[1728.15,-69.4],[604.227,-13.72]],"z1k":1728.15,"spark":[4.733,4.764,4.816,4.919,4.793,5.214,4.696,5.307,4.901,4.979,4.992,4.303,4.547,4.378,4.131,3.937,3.719,3.488,3.293,3.109,2.953,2.851,2.799,2.789],"stats":{"zmax":223516.0,"zmin":576.745,"ph_min":-83.5895,"f_ph_min":94.5544,"f_peak":6.99578,"zi_peak":110324.0,"r_lo":53074.3,"r_hi":599.77}},{"file_id":70,"path":"csv_archive/day2icc2mlwater_eis.csv","filename":"day2icc2mlwater_eis.csv","mtime":1785860000.0,"saved_at":"2026-08-04 10:49","kind":"eis","board":"ads1256","n_points":87,"f_lo_hz":0.091543,"f_hi_hz":11170.2,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":18768.6,"median_phase_raw_deg":-50.4659,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"icc dirt, day 2, +2 ml water","summary":"The ICC dirt on day 2 after 2 ml of water, on the ads1256 rig: 87 points from 0.09154 to 11170 Hz. Raw |Z| goes from 57550 ohm at the low end to 586.4 ohm at the high end (median 18770). The low end dropped from 66970 ohm in the dry baseline. The median phase is -50.47 deg, with a minimum of -103.2 deg and a maximum of 57.69 deg that point to a few noisy points. It is the second run of the day-2 series and a trustworthy soil record.","exclude_reason":null,"confidence":0.8,"zat":[[55684.8,10.8],[133567.0,-55.05],[17240.3,-81.79],[1697.97,-63.82],[603.027,-13.22]],"z1k":1697.97,"spark":[4.76,5.013,4.821,4.628,4.544,4.667,4.934,4.92,5.202,4.615,5.004,4.809,4.553,4.383,4.131,3.952,3.721,3.489,3.307,3.115,2.959,2.862,2.788,2.768],"stats":{"zmax":227213.0,"zmin":582.248,"ph_min":-103.245,"f_ph_min":0.360207,"f_peak":5.47061,"zi_peak":117632.0,"r_lo":57233.7,"r_hi":570.766}},{"file_id":72,"path":"csv_archive/day2iccdirtdry_eis.csv","filename":"day2iccdirtdry_eis.csv","mtime":1785860000.0,"saved_at":"2026-08-04 10:38","kind":"eis","board":"ads1256","n_points":87,"f_lo_hz":0.0915284,"f_hi_hz":11416.3,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":17727.7,"median_phase_raw_deg":-48.1935,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"icc dirt, day 2, dry","summary":"The full-band day-2 dry baseline of the ICC dirt on the ads1256 rig: 87 points from 0.09153 to 11420 Hz. Raw |Z| falls from 66970 ohm at the low end to 596.8 ohm at the high end (median 17730), with a median phase of -48.19 deg (range -84.06 to 57.07). The low end is almost identical to day 1 (67970 ohm), so the soil dried back overnight. It starts the day-2 watering series (2 ml, then 5 ml). It is a trustworthy soil record, with the usual caveat that dry soil sits near this board's open ceiling.","exclude_reason":null,"confidence":0.8,"zat":[[176598.0,-19.92],[135581.0,-55.53],[16993.5,-82.3],[1715.86,-69.0],[595.885,-14.55]],"z1k":1715.86,"spark":[4.826,4.734,4.522,4.392,4.682,4.802,4.751,5.156,4.77,5.079,4.64,4.802,4.588,4.338,4.123,3.928,3.719,3.501,3.296,3.111,2.948,2.841,2.805,2.776],"stats":{"zmax":234611.0,"zmin":592.732,"ph_min":-84.0588,"f_ph_min":106.411,"f_peak":6.94327,"zi_peak":120434.0,"r_lo":66923.1,"r_hi":582.758}},{"file_id":69,"path":"csv_archive/day2drydritrticc_eis.csv","filename":"day2drydritrticc_eis.csv","mtime":1785860000.0,"saved_at":"2026-08-04 10:19","kind":"eis","board":"ads1256","n_points":129,"f_lo_hz":598.248,"f_hi_hz":11110.3,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":863.934,"median_phase_raw_deg":-46.1919,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"icc dirt, day 2, dry","summary":"A high-frequency-only sweep of the ICC dirt on day 2 ('dritrt' is a typo for 'dirt'), on the ads1256 rig: 129 points from 598.2 to 11110 Hz. Raw |Z| goes from 2854 ohm at the low end to 609.6 ohm at the high end (median 863.9), with a median phase of -46.19 deg (range -76.87 to -10.01). It looks like a partial-band first attempt; day2iccdirtdry, the full-band sweep 19 minutes later, supersedes it. It is fine as a soil record, but it covers only the upper part of the band.","exclude_reason":null,"confidence":0.7,"zat":[null,null,null,[1766.51,-69.92],[612.06,-12.62]],"z1k":1766.51,"spark":[3.455,3.401,3.337,3.282,3.248,3.204,3.146,3.102,3.07,3.027,2.991,2.948,2.936,2.895,2.87,2.851,2.831,2.823,2.813,2.814,2.779,2.777,2.784,2.785],"stats":{"zmax":2853.57,"zmin":578.513,"ph_min":-76.8717,"f_ph_min":598.248,"f_peak":598.248,"zi_peak":2778.99,"r_lo":648.14,"r_hi":596.731}},{"file_id":86,"path":"csv_archive/iccdirt3mlwater_eis.csv","filename":"iccdirt3mlwater_eis.csv","mtime":1785770000.0,"saved_at":"2026-08-03 10:24","kind":"eis","board":"ads1256","n_points":372,"f_lo_hz":0.0916589,"f_hi_hz":11222.0,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":10640.1,"median_phase_raw_deg":-60.7843,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"icc dirt, +3 ml water","summary":"The ICC dirt after 3 ml of water on the ads1256 rig: 372 points from 0.09166 to 11220 Hz. Raw |Z| goes from 53490 ohm at the low end to 625.3 ohm at the high end (median 10640). The low end dropped from 67970 ohm in the dry baseline, as watering should do, while the median barely changed. The median phase is -60.78 deg (range -86.98 to 41.24), similar to the dry run. It is the second and last run of the day-1 ICC series. It is a trustworthy soil record.","exclude_reason":null,"confidence":0.8,"zat":[[133027.0,-6.001],[93507.0,-63.05],[16184.9,-77.49],[1815.77,-69.69],[613.895,-12.15]],"z1k":1815.77,"spark":[4.728,4.763,4.868,4.727,4.517,4.671,4.599,5.297,5.11,5.019,4.883,4.816,4.469,4.384,4.167,3.95,3.717,3.509,3.295,3.105,2.95,2.846,2.828,2.796],"stats":{"zmax":235491.0,"zmin":589.316,"ph_min":-86.9841,"f_ph_min":89.5012,"f_peak":7.02025,"zi_peak":121453.0,"r_lo":53305.9,"r_hi":616.687}},{"file_id":87,"path":"csv_archive/iccdirtdry_eis.csv","filename":"iccdirtdry_eis.csv","mtime":1785770000.0,"saved_at":"2026-08-03 09:46","kind":"eis","board":"ads1256","n_points":372,"f_lo_hz":0.0916064,"f_hi_hz":11110.0,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":10421.2,"median_phase_raw_deg":-59.0474,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"icc dirt dry","summary":"The dry baseline of the ICC dirt series on the ads1256 rig: 372 points from 0.09161 to 11110 Hz. Raw |Z| falls from 67970 ohm at the low end to 588.4 ohm at the high end (median 10420), with a strongly capacitive median phase of -59.05 deg (range -87.57 to 50.81). A 3 ml watering run follows 38 minutes later. As with the August series, these numbers sit close to the open-circuit sweeps on this board, so dry soil may be near the ceiling. It is fine as a qualitative record.","exclude_reason":null,"confidence":0.8,"zat":[[163834.0,25.39],[70735.3,-27.95],[15507.2,-61.44],[1783.09,-69.89],[623.108,-13.02]],"z1k":1783.09,"spark":[4.832,4.74,4.743,5.181,4.865,5.385,4.827,5.343,4.877,5.165,4.204,4.763,4.596,4.386,4.159,3.937,3.713,3.514,3.298,3.106,2.963,2.871,2.821,2.77],"stats":{"zmax":243017.0,"zmin":588.197,"ph_min":-87.5698,"f_ph_min":195.662,"f_peak":6.50829,"zi_peak":122265.0,"r_lo":67840.9,"r_hi":578.573}},{"file_id":38,"path":"csv_archive/1413uScmsolution_eis.csv","filename":"1413uScmsolution_eis.csv","mtime":1785740000.0,"saved_at":"2026-08-03 01:34","kind":"eis","board":"ads1256","n_points":200,"f_lo_hz":0.0916791,"f_hi_hz":8153.36,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":1340.19,"median_phase_raw_deg":-13.4002,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"conductivity_standard","condition":"1413 uS/cm","summary":"A 1413 uS/cm conductivity standard solution on the ads1256 rig: 200 points from 0.09168 to 8153 Hz. Raw |Z| falls from 3306 ohm at the low end to 544.5 ohm at the high end (median 1340). The phase is mild, between -27.43 and 4.162 deg (median -13.4 deg), which fits an ionic solution whose resistive bulk shows up at high frequency, with electrode polarisation at low frequency. A repeat on 2026-08-08 (1413uscmknownsample) reads a little higher. This is a clean, trustworthy record of the standard on the old board.","exclude_reason":null,"confidence":0.9,"zat":[[2269.35,-9.221],[1873.88,-11.85],[1306.26,-12.22],[1025.43,-21.82],null],"z1k":1025.43,"spark":[3.519,3.451,3.41,3.383,3.363,3.354,3.339,3.321,3.307,3.287,3.264,3.221,3.189,3.163,3.123,3.133,3.106,3.091,3.06,3.004,2.914,2.832,2.771,2.736],"stats":{"zmax":3306.37,"zmin":492.12,"ph_min":-27.4293,"f_ph_min":2027.87,"f_peak":0.0916791,"zi_peak":571.254,"r_lo":3256.65,"r_hi":539.117}},{"file_id":65,"path":"csv_archive/auust6mlwaterplusseveralhours_eis.csv","filename":"auust6mlwaterplusseveralhours_eis.csv","mtime":1785740000.0,"saved_at":"2026-08-03 01:18","kind":"eis","board":"ads1256","n_points":87,"f_lo_hz":1.46917,"f_hi_hz":8375.56,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":8334.54,"median_phase_raw_deg":-58.4723,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"august, 6 ml water plus several hours","summary":"The August soil several hours after the 6 ml watering ('auust' is a typo for 'august'), on the ads1256 rig. The band is shorter, 1.469 to 8376 Hz. Raw |Z| reads 1221 ohm at the low end and 592.4 ohm at the high end, but the median is 8335 ohm, so the curve is not monotonic. The phase spans -172.7 to 174.2 deg (median -58.47 deg), which shows heavy wrapping or noise. It closes the watering series, but the data is messy. Trust the label, not the individual numbers.","exclude_reason":null,"confidence":0.7,"zat":[null,[147896.0,-67.4],[15976.3,-67.36],[1764.72,-71.56],null],"z1k":1764.72,"spark":[3.087,5.504,5.437,4.935,5.309,5.18,5.076,4.823,4.506,4.136,4.429,4.244,4.006,3.877,3.762,3.586,3.413,3.274,3.16,3.0,2.947,2.71,2.837,2.773],"stats":{"zmax":352835.0,"zmin":483.96,"ph_min":-172.695,"f_ph_min":2.69053,"f_peak":4.83096,"zi_peak":197819.0,"r_lo":1215.99,"r_hi":565.182}},{"file_id":61,"path":"csv_archive/august6mlwater_eis.csv","filename":"august6mlwater_eis.csv","mtime":1785730000.0,"saved_at":"2026-08-02 22:44","kind":"eis","board":"ads1256","n_points":87,"f_lo_hz":0.0916837,"f_hi_hz":7835.91,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":12772.1,"median_phase_raw_deg":-49.2685,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"august, +6 ml water","summary":"The August soil at 6 ml of water, the third watering step, on the ads1256 rig: 87 points from 0.09168 to 7836 Hz. Raw |Z| goes from 64900 ohm at the low end to 707.8 ohm at the high end (median 12770), with a median phase of -49.27 deg (range -87.17 to 56.69). The median is the lowest of the watering series, but the low end is still above the dry baseline of 51250 ohm. A follow-up run several hours later exists. The label is trustworthy as a series record.","exclude_reason":null,"confidence":0.8,"zat":[[161812.0,-6.375],[18925.7,14.29],[15929.0,-77.86],[1774.05,-69.61],null],"z1k":1774.05,"spark":[4.812,4.809,4.832,4.654,4.915,4.996,4.949,4.565,4.805,5.152,3.944,4.877,4.68,4.47,4.252,4.031,3.837,3.547,3.384,3.22,3.062,2.905,2.817,2.85],"stats":{"zmax":198758.0,"zmin":547.044,"ph_min":-87.1685,"f_ph_min":258.333,"f_peak":8.81661,"zi_peak":96514.7,"r_lo":63933.3,"r_hi":680.308}},{"file_id":60,"path":"csv_archive/august4mlwater_eis.csv","filename":"august4mlwater_eis.csv","mtime":1785720000.0,"saved_at":"2026-08-02 21:23","kind":"eis","board":"ads1256","n_points":87,"f_lo_hz":0.091734,"f_hi_hz":7558.7,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":15931.7,"median_phase_raw_deg":-49.3751,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"august, +4 ml water","summary":"The August soil at 4 ml of water, the second watering step, on the ads1256 rig: 87 points from 0.09173 to 7559 Hz. Raw |Z| goes from 104100 ohm at the low end to 600.9 ohm at the high end (median 15930), with a median phase of -49.38 deg (range -89.54 to 27.88). The low end rose again compared with the 2 ml run (61330 ohm) instead of falling, so the series does not show the expected drop with watering. The high end barely moves across the series and sits at the board's usual value of about 600 ohm. The label is reliable, but the trend is questionable.","exclude_reason":null,"confidence":0.8,"zat":[[70477.3,-11.02],[129233.0,-51.85],[16571.1,-81.85],[1832.13,-71.63],null],"z1k":1832.13,"spark":[5.017,4.864,4.714,4.639,5.11,4.762,4.908,5.269,5.271,5.071,5.047,4.892,4.462,4.477,4.223,4.058,3.788,3.67,3.446,3.24,3.072,2.927,2.836,2.779],"stats":{"zmax":216975.0,"zmin":580.557,"ph_min":-89.5351,"f_ph_min":192.093,"f_peak":6.97543,"zi_peak":109305.0,"r_lo":102669.0,"r_hi":585.022}},{"file_id":59,"path":"csv_archive/august2mlwater_eis.csv","filename":"august2mlwater_eis.csv","mtime":1785720000.0,"saved_at":"2026-08-02 20:48","kind":"eis","board":"ads1256","n_points":87,"f_lo_hz":0.0916343,"f_hi_hz":7923.83,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":14844.5,"median_phase_raw_deg":-43.177,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"august, +2 ml water","summary":"The August soil after adding 2 ml of water, the first watering step after the augustdry baseline, on the ads1256 rig: 87 points from 0.09163 to 7924 Hz. Raw |Z| goes from 61330 ohm at the low end to 572.4 ohm at the high end (median 14840), with a median phase of -43.18 deg (range -84.32 to 50.12). The low end is actually higher than the dry baseline (51250 ohm), which is the opposite of what watering should do. Most likely the water had not reached the electrodes yet, or the board is near its ceiling. It is fine as a series record but weak as evidence of a moisture trend.","exclude_reason":null,"confidence":0.8,"zat":[[87022.8,4.058],[106739.0,-40.62],[11878.9,-55.41],[1797.81,-69.73],null],"z1k":1797.81,"spark":[4.788,4.894,4.801,4.604,5.054,5.11,4.991,4.197,4.884,5.073,4.909,4.153,4.671,4.42,4.12,3.991,3.801,3.568,3.344,3.197,3.051,2.919,2.844,2.758],"stats":{"zmax":141704.0,"zmin":564.645,"ph_min":-84.3229,"f_ph_min":258.783,"f_peak":12.6931,"zi_peak":70536.6,"r_lo":59886.5,"r_hi":545.171}},{"file_id":62,"path":"csv_archive/augustdry_0p1to225hz_eis.csv","filename":"augustdry_0p1to225hz_eis.csv","mtime":1785710000.0,"saved_at":"2026-08-02 17:59","kind":"eis","board":"ads1256","n_points":76,"f_lo_hz":0.0916465,"f_hi_hz":200.92,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":49704.1,"median_phase_raw_deg":-39.6958,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"august dry","summary":"A low-frequency sweep of the August dry soil on the ads1256 rig, taken 6 minutes after the full augustdry run: 76 points from 0.09165 to 200.9 Hz ('0p1to225hz'). Raw |Z| goes from 53260 ohm to 7355 ohm (median 49700). The low end matches the full sweep's 51250 ohm. The median phase is -39.7 deg, but the range of -127.7 to 59.17 deg shows noisy or wrapped points. It is a reasonable zoom-in on the low-frequency end, with the same near-open-ceiling caveat as the full sweep.","exclude_reason":null,"confidence":0.75,"zat":[[66519.7,-7.367],[32497.0,18.26],[17399.7,-77.42],null,null],"z1k":null,"spark":[4.726,4.787,4.849,4.836,4.736,4.565,4.738,4.994,4.968,4.955,5.138,4.87,4.877,5.089,4.42,4.959,4.613,4.235,4.629,4.492,4.353,4.227,4.076,3.867],"stats":{"zmax":140049.0,"zmin":4545.44,"ph_min":-127.741,"f_ph_min":13.0591,"f_peak":10.5655,"zi_peak":70955.3,"r_lo":52922.5,"r_hi":3495.52}},{"file_id":64,"path":"csv_archive/augustdry_eis.csv","filename":"augustdry_eis.csv","mtime":1785710000.0,"saved_at":"2026-08-02 17:53","kind":"eis","board":"ads1256","n_points":87,"f_lo_hz":0.0918313,"f_hi_hz":7937.6,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":13834.2,"median_phase_raw_deg":-46.6439,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"august dry","summary":"The full dry-soil baseline of the August watering series on the ads1256 rig: 87 points from 0.09183 to 7938 Hz. Raw |Z| falls from 51250 ohm at the low end to 574.6 ohm at the high end (median 13830), and the median phase is -46.64 deg (range -85.06 to 52.2). The 2, 4 and 6 ml watering runs follow. These numbers are very close to the open-circuit calibration sweeps of 2026-08-08 (for example 68560 to 626.6 ohm, median phase -50.28 deg), so the soil may be near the board's open ceiling. Use it with caution for quantitative work.","exclude_reason":null,"confidence":0.8,"zat":[[29617.7,-1.983],[106483.0,-41.06],[16925.0,-82.82],[1900.27,-71.17],null],"z1k":1900.27,"spark":[4.71,4.701,4.583,4.633,4.833,4.488,5.148,5.071,5.122,4.981,4.558,4.82,4.64,4.376,4.275,3.906,3.838,3.592,3.422,3.241,3.071,2.922,2.825,2.759],"stats":{"zmax":141441.0,"zmin":553.063,"ph_min":-85.0606,"f_ph_min":273.795,"f_peak":10.9083,"zi_peak":70828.5,"r_lo":51022.5,"r_hi":574.212}},{"file_id":63,"path":"csv_archive/augustdry_300to400hz_eis.csv","filename":"augustdry_300to400hz_eis.csv","mtime":1785710000.0,"saved_at":"2026-08-02 16:58","kind":"eis","board":"ads1256","n_points":10,"f_lo_hz":315.456,"f_hi_hz":1795.36,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":4751.34,"median_phase_raw_deg":-73.9536,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"august dry","summary":"A short band-limited sweep of the August dry soil on the ads1256 rig. Despite the '300to400hz' name, it has only 10 points from 315.5 to 1795 Hz. Raw |Z| stays between 4437 ohm and 3396 ohm (median 4751), and the phase is strongly negative throughout (median -73.95 deg, range -105.7 to -61.58). This is unusually capacitive for soil at these frequencies compared with the full sweep that follows. It comes before the full augustdry sweep and the watering series. Treat it as a quick exploratory run.","exclude_reason":null,"confidence":0.75,"zat":[null,null,null,[3044.1,-70.63],null],"z1k":3044.1,"spark":[3.647,3.697,3.757,3.703,3.645,3.587,3.529,3.471,3.464,3.467,3.47,3.472,3.475,3.477,3.48,3.483,3.485,3.488,3.491,3.493,3.496,3.506,3.518,3.531],"stats":{"zmax":5750.65,"zmin":2897.34,"ph_min":-105.667,"f_ph_min":1795.36,"f_peak":367.759,"zi_peak":5685.04,"r_lo":1512.82,"r_hi":-917.043}},{"file_id":32,"path":"csv_archive/100ufcap30to300hz_eis.csv","filename":"100ufcap30to300hz_eis.csv","mtime":1785690000.0,"saved_at":"2026-08-02 12:48","kind":"eis","board":"ads1256","n_points":250,"f_lo_hz":61.4545,"f_hi_hz":421.285,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":3246.97,"median_phase_raw_deg":-5.07533,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"capacitor","condition":null,"summary":"A narrow-band re-run of the 100 uF capacitor on the ads1256 rig. The name says 30-300 Hz, but the data actually covers 61.45 to 421.3 Hz (250 points). Raw |Z| falls from 6077 ohm to 202.9 ohm (median 3247). The median phase is -5.075 deg, only reaching -85.28 deg at its extreme, which is not what a 100 uF part should look like in this band (its |Z| should be tens of ohms or less). The rig evidently struggles to resolve such a low impedance. The identity from the name is credible, but the data quality is poor.","exclude_reason":null,"confidence":0.7,"zat":[null,null,[7453.19,-29.79],null,null],"z1k":null,"spark":[3.784,3.883,3.775,3.847,4.067,3.972,3.907,4.138,3.778,3.285,3.314,3.512,3.52,3.742,3.585,2.725,3.592,3.63,3.127,3.568,3.612,3.684,2.291,2.307],"stats":{"zmax":13796.1,"zmin":181.978,"ph_min":-85.2843,"f_ph_min":132.588,"f_peak":111.363,"zi_peak":13669.7,"r_lo":5664.72,"r_hi":202.909}},{"file_id":33,"path":"csv_archive/100ufcap_eis.csv","filename":"100ufcap_eis.csv","mtime":1785690000.0,"saved_at":"2026-08-02 12:32","kind":"eis","board":"ads1256","n_points":693,"f_lo_hz":0.294719,"f_hi_hz":15151.5,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":3314.55,"median_phase_raw_deg":-19.734,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"capacitor","condition":null,"summary":"A 100 uF capacitor ('100ufcap') on the ads1256 rig: 693 points from 0.2947 to 15150 Hz. Raw |Z| falls from 15590 ohm at the low end to 716.1 ohm at the high end (median 3315). An ideal 100 uF part would read a few ohms at the high end, so the high end is probably the board's floor. The median phase is only -19.73 deg (range -77.7 to 32.02), much less capacitive than an ideal capacitor, so the rig resolves this part poorly over much of the band. The value from the name is credible. A narrower re-run follows 16 minutes later.","exclude_reason":null,"confidence":0.75,"zat":[[7690.8,-29.66],[6663.35,-4.099],[6112.44,-20.92],[2501.23,-72.8],[547.655,-17.72]],"z1k":2501.23,"spark":[4.193,4.077,3.953,3.849,3.783,3.847,3.802,3.847,3.835,3.859,4.5,3.588,3.434,3.809,3.863,3.588,3.457,3.387,3.229,3.038,2.864,2.707,2.783,2.855],"stats":{"zmax":32017.7,"zmin":177.402,"ph_min":-77.7015,"f_ph_min":875.521,"f_peak":148.374,"zi_peak":11997.2,"r_lo":11748.5,"r_hi":693.085}},{"file_id":139,"path":"csv_archive/respluscap_eis.csv","filename":"respluscap_eis.csv","mtime":1785620000.0,"saved_at":"2026-08-01 17:13","kind":"eis","board":"ads1256","n_points":693,"f_lo_hz":0.303152,"f_hi_hz":14848.5,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":7.72307,"median_phase_raw_deg":-48.2994,"frac_open":0.015873,"temp_c":null,"medium_tag":"","notes_tag":"","category":"rc_network","condition":null,"summary":"A resistor-plus-capacitor network of unstated values on the ads1256 rig: 693 points from 0.3032 to 14850 Hz. Raw |Z| drops from 7428 ohm at the low end to 12.32 ohm at the high end, with an odd median of 7.723 ohm, so most points sit very low. That looks like a parallel RC or a capacitor-dominated path at most frequencies. The phase ranges from -88.22 to 69.27 deg (median -48.3 deg): capacitive, with a few noisy high points. 1.6% of points are unresolved. Because no values are given, it is useful only as a qualitative check.","exclude_reason":null,"confidence":0.7,"zat":[[2212.81,-87.59],[224.369,-86.64],[12.2855,-71.25],[2.78567,3.22],[9.61017,48.37]],"z1k":2.78567,"spark":[3.871,3.663,3.455,3.254,3.05,2.85,2.643,2.441,2.241,2.039,1.846,1.635,1.45,1.257,1.072,0.69,0.479,0.487,0.566,0.55,0.683,0.848,0.993,1.091],"stats":{"zmax":7427.56,"zmin":1.97107,"ph_min":-88.2228,"f_ph_min":3.7655,"f_peak":0.303152,"zi_peak":7401.86,"r_lo":617.369,"r_hi":10.1901}},{"file_id":161,"path":"csv_archive/testmultitone_eis.csv","filename":"testmultitone_eis.csv","mtime":1785440000.0,"saved_at":"2026-07-30 15:33","kind":"eis","board":"ads1256","n_points":27,"f_lo_hz":0.1,"f_hi_hz":11.2646,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":187692.0,"median_phase_raw_deg":-42.946,"frac_open":0.037037,"temp_c":null,"medium_tag":"","notes_tag":"330ohms","category":"resistor","condition":null,"summary":"A 330 ohm resistor (value from the notes tag '330ohms') on the wenner4 fixture, pcm1808 board, 680 ohm shunt, 80 multitone points from 4 Hz to 29.8 kHz. Raw |Z| is 493.9 ohm at the low end and 491.5 ohm at the high end (median 494.8 ohm), and the median phase is -0.2278 deg. That is a clean resistive response matching the stepped test330ohms run two minutes earlier. All points resolved. The value comes only from the tag, but the data agrees closely with its neighbours, so it is proposed as a calibration standard with slightly lower confidence.","exclude_reason":null,"confidence":0.8,"zat":[null,null,null,null,null],"z1k":null,"spark":null,"stats":{"zmax":674142.0,"zmin":34917.9,"ph_min":-113.931,"f_ph_min":11.2646,"f_peak":11.2646,"zi_peak":616191.0,"r_lo":-273452.0,"r_hi":425638.0}},{"file_id":66,"path":"csv_archive/cactus_eis.csv","filename":"cactus_eis.csv","mtime":1785430000.0,"saved_at":"2026-07-30 12:37","kind":"eis","board":"ads1256","n_points":358,"f_lo_hz":0.151515,"f_hi_hz":4910.1,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":11736.7,"median_phase_raw_deg":-41.6359,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"plant","condition":"cactus","summary":"A cactus on the ads1256 rig, the last run of the 2026-07-30 plant session: 358 points from 0.1515 to 4910 Hz. Raw |Z| falls from 36140 ohm at the low end to 671.7 ohm at the high end (median 11740), higher than the tropical plant, as you would expect for drier tissue. The phase reaches -104.0 deg at low frequency (median -41.64 deg), strongly capacitive. The high-end value of about 670 ohm matches the other runs on this board, which is likely the rig's floor or ceiling rather than the plant itself. It is a reasonable plant record.","exclude_reason":null,"confidence":0.85,"zat":[[33434.5,-5.483],[28280.1,-10.82],[19202.5,-32.57],[1850.53,-63.95],null],"z1k":1850.53,"spark":[4.558,4.554,4.549,4.542,4.526,4.514,4.502,4.487,4.469,4.453,4.433,4.407,4.387,4.353,4.308,4.241,3.733,3.996,3.713,3.446,3.133,3.001,2.896,2.827],"stats":{"zmax":36138.2,"zmin":671.651,"ph_min":-103.954,"f_ph_min":621.671,"f_peak":98.3904,"zi_peak":11633.3,"r_lo":36088.1,"r_hi":589.49}},{"file_id":180,"path":"csv_archive/tropical_plant_plus1cm_eis.csv","filename":"tropical_plant_plus1cm_eis.csv","mtime":1785430000.0,"saved_at":"2026-07-30 12:23","kind":"eis","board":"ads1256","n_points":358,"f_lo_hz":0.30303,"f_hi_hz":4792.64,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":7627.03,"median_phase_raw_deg":-34.4226,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"plant","condition":"tropical plant, probe moved +1 cm","summary":"A repeat of the tropical plant sweep on the ads1256 rig with the probe moved 1 cm, taken 10 minutes after the first. Raw |Z| goes from 22810 ohm at 0.303 Hz to 659.4 ohm at 4793 Hz (median 7627), slightly lower at the low end than the first position. The high end is unchanged. The phase ranges from -80.48 to -1.76 deg (median -34.42 deg), which fits plant tissue. It is a clean, consistent repeat and trustworthy as a plant record.","exclude_reason":null,"confidence":0.85,"zat":[[20447.1,-5.206],[16609.8,-12.59],[11109.6,-26.22],[1452.11,-56.78],null],"z1k":1452.11,"spark":[4.358,4.335,4.321,4.308,4.292,4.275,4.266,4.244,4.221,4.177,4.152,4.14,4.105,4.044,4.014,4.014,3.6,3.843,3.466,3.279,3.152,3.002,2.89,2.819],"stats":{"zmax":22805.7,"zmin":659.433,"ph_min":-80.4773,"f_ph_min":1364.91,"f_peak":17.9166,"zi_peak":6144.28,"r_lo":22794.9,"r_hi":589.217}},{"file_id":179,"path":"csv_archive/tropical_plant_eis.csv","filename":"tropical_plant_eis.csv","mtime":1785430000.0,"saved_at":"2026-07-30 12:13","kind":"eis","board":"ads1256","n_points":358,"f_lo_hz":0.30303,"f_hi_hz":4801.3,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":8606.02,"median_phase_raw_deg":-36.6245,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"plant","condition":"tropical plant","summary":"A tropical plant measured on the ads1256 rig: 358 points from 0.303 to 4801 Hz with a 470 ohm shunt. Raw |Z| falls from 26590 ohm at the low end to 659.1 ohm at the high end (median 8606). The phase is strongly capacitive at low frequency, down to -90.51 deg (median -36.62 deg), which fits plant tissue with electrode polarisation. It is the first of a short plant session: a repeat with the probe moved 1 cm follows, then a cactus. The data is clean and consistent with the label.","exclude_reason":null,"confidence":0.85,"zat":[[23538.1,-5.932],[18848.8,-11.44],[12976.8,-27.8],[1458.81,-58.74],null],"z1k":1458.81,"spark":[4.425,4.404,4.383,4.371,4.349,4.351,4.322,4.312,4.296,4.229,4.209,4.216,4.178,4.147,4.086,4.057,3.726,3.82,3.393,3.56,3.067,3.004,2.894,2.819],"stats":{"zmax":26590.7,"zmin":659.076,"ph_min":-90.508,"f_ph_min":1182.99,"f_peak":227.136,"zi_peak":8247.47,"r_lo":26540.9,"r_hi":586.524}},{"file_id":49,"path":"csv_archive/4-9cmright_eis.csv","filename":"4-9cmright_eis.csv","mtime":1785390000.0,"saved_at":"2026-07-30 01:54","kind":"eis","board":"ads1256","n_points":358,"f_lo_hz":0.223508,"f_hi_hz":4919.36,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":930.384,"median_phase_raw_deg":-16.6239,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"probe moved 9 cm right","summary":"Run 4, the last of the probe-position series on the ads1256 rig, with the probe 9 cm to the right. Raw |Z| falls from 2256 ohm at 0.2235 Hz to 439.1 ohm at 4919 Hz (median 930.4), slightly lower than run 3. The phase reaches -59.57 deg at low frequency (median -16.62 deg, maximum 1.669 deg), which looks like soil with electrode polarisation. The data is clean, but the medium is not tagged and is inferred from the series. Treat the category as a reasonable guess.","exclude_reason":null,"confidence":0.4,"zat":[[1838.49,-10.77],[1532.77,-12.51],[1125.13,-19.56],[503.424,-16.54],null],"z1k":503.424,"spark":[3.353,3.331,3.305,3.277,3.249,3.229,3.212,3.2,3.193,3.182,3.159,3.143,3.116,3.088,3.054,2.858,2.97,2.999,2.768,2.756,2.679,2.649,2.636,2.643],"stats":{"zmax":2255.83,"zmin":428.452,"ph_min":-59.5735,"f_ph_min":354.626,"f_peak":354.626,"zi_peak":989.549,"r_lo":2223.66,"r_hi":438.926}},{"file_id":47,"path":"csv_archive/3-6cmright_eis.csv","filename":"3-6cmright_eis.csv","mtime":1785390000.0,"saved_at":"2026-07-30 01:36","kind":"eis","board":"ads1256","n_points":358,"f_lo_hz":0.210828,"f_hi_hz":4960.94,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":1101.9,"median_phase_raw_deg":-16.1093,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"probe moved 6 cm right","summary":"Run 3 of the probe-position series on the ads1256 rig, with the probe 6 cm to the right. Raw |Z| goes from 2791 ohm at 0.2108 Hz to 466.8 ohm at 4961 Hz (median 1102), back in line with run 1 after the low reading of run 2. The median phase is -16.11 deg and reaches -50.43 deg at low frequency, which fits soil with electrode polarisation. It was saved more than three hours after run 2. The medium is inferred and not tagged, so the label is only moderately trustworthy.","exclude_reason":null,"confidence":0.4,"zat":[[2086.43,-9.206],[1797.21,-11.37],[1341.02,-18.54],[591.197,-18.12],null],"z1k":591.197,"spark":[3.446,3.407,3.368,3.335,3.311,3.298,3.284,3.273,3.264,3.251,3.234,3.217,3.192,3.164,3.129,2.891,3.042,2.921,2.879,2.789,2.733,2.714,2.681,2.669],"stats":{"zmax":2790.96,"zmin":449.31,"ph_min":-50.4331,"f_ph_min":330.329,"f_peak":345.535,"zi_peak":1413.22,"r_lo":2777.1,"r_hi":465.44}},{"file_id":42,"path":"csv_archive/2-plus3cmright_eis.csv","filename":"2-plus3cmright_eis.csv","mtime":1785380000.0,"saved_at":"2026-07-29 22:00","kind":"eis","board":"ads1256","n_points":358,"f_lo_hz":0.30303,"f_hi_hz":5065.23,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":393.589,"median_phase_raw_deg":-4.1988,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"probe moved +3 cm right","summary":"Run 2 of the probe-position series on the ads1256 rig, with the probe moved 3 cm to the right. Raw |Z| is unusually low and flat for this series: 494.6 ohm at 0.303 Hz down to 334.4 ohm at 5065 Hz (median 393.6). The phase stays near zero (median -4.199 deg, range -23.9 to 17.84). That fits a wetter or saltier spot, or a much better electrode contact, rather than the soil seen in runs 1, 3 and 4. The medium is assumed from the series and is not confirmed, so trust is low. The jump compared with its neighbours deserves a look.","exclude_reason":null,"confidence":0.4,"zat":[[474.57,-3.074],[442.79,-3.727],[410.213,-4.456],[353.908,-7.205],null],"z1k":353.908,"spark":[2.694,2.686,2.681,2.675,2.672,2.664,2.658,2.653,2.648,2.642,2.636,2.631,2.624,2.618,2.611,2.6,2.547,2.581,2.554,2.531,2.51,2.494,2.508,2.524],"stats":{"zmax":725.957,"zmin":222.049,"ph_min":-23.9037,"f_ph_min":514.255,"f_peak":514.255,"zi_peak":117.204,"r_lo":494.378,"r_hi":332.469}},{"file_id":40,"path":"csv_archive/1_eis.csv","filename":"1_eis.csv","mtime":1785380000.0,"saved_at":"2026-07-29 21:41","kind":"eis","board":"ads1256","n_points":358,"f_lo_hz":0.159537,"f_hi_hz":4978.53,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":1416.72,"median_phase_raw_deg":-18.7424,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"possibly 1 cm step of a depth/level series (unconfirmed)","summary":"Probably soil, measured with a Wenner 4-rod array on the experimental picoadc board with a 5000 ohm shunt. The filename is a bare run index, so the category is inferred from the session. Raw |Z| goes from 393.3 to 576.5 ohm (median 548.7), the highest of the session, and the phase is mostly small and positive (median 2.133 deg, max 29.06 deg). There are no unresolved points over 500 points down to 0.09998 Hz. It comes right after the base-soil run and before '2-2.5ishcm' and '3-3.5cmishover', so it may be a 1 cm step of a series, but that is a guess. Moderate-to-low trust.","exclude_reason":null,"confidence":0.45,"zat":[[2539.11,-9.522],[2156.31,-12.29],[1045.64,-27.65],[645.504,-24.44],null],"z1k":645.504,"spark":[3.489,3.473,3.457,3.434,3.406,3.386,3.37,3.358,3.347,3.337,3.323,3.307,3.287,3.263,3.233,3.199,3.157,2.999,3.002,2.896,2.795,2.739,2.701,2.688],"stats":{"zmax":3082.27,"zmin":482.872,"ph_min":-59.8649,"f_ph_min":287.937,"f_peak":287.937,"zi_peak":2109.91,"r_lo":3057.09,"r_hi":481.631}},{"file_id":157,"path":"csv_archive/testcapacitor_eis.csv","filename":"testcapacitor_eis.csv","mtime":1785310000.0,"saved_at":"2026-07-29 02:29","kind":"eis","board":"ads1256","n_points":361,"f_lo_hz":0.151515,"f_hi_hz":1667.0,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":14723.9,"median_phase_raw_deg":-74.9834,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"capacitor","condition":null,"summary":"A capacitor of unstated value on the ads1256 rig: 361 points from 0.1515 to 1667 Hz with a 470 ohm shunt. Raw |Z| drops steeply from 473800 ohm at the low end to 1297 ohm at the high end (median 14720), the strong 1/f trend you expect from a capacitor. The median phase is -74.98 deg (range -118.4 to -1.185), close to the ideal -90 deg. The data clearly fits the name. Because no value is given, it cannot serve as a reference capacitor.","exclude_reason":null,"confidence":0.85,"zat":[[475681.0,-6.864],[307520.0,-49.54],[39236.1,-85.6],[823.997,-39.48],null],"z1k":823.997,"spark":[5.676,5.674,5.672,5.671,5.675,5.672,5.667,5.656,5.638,5.566,5.526,5.421,5.274,5.111,4.948,4.785,4.61,4.42,3.749,4.086,3.407,3.2,3.181,3.113],"stats":{"zmax":479354.0,"zmin":646.848,"ph_min":-118.382,"f_ph_min":602.731,"f_peak":8.22871,"zi_peak":240129.0,"r_lo":473705.0,"r_hi":597.115}},{"file_id":170,"path":"csv_archive/testsoil_eis.csv","filename":"testsoil_eis.csv","mtime":1785290000.0,"saved_at":"2026-07-28 21:07","kind":"eis","board":"ads1256","n_points":361,"f_lo_hz":0.151515,"f_hi_hz":5912.7,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":5126.04,"median_phase_raw_deg":-28.4877,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":null,"summary":"A soil sweep on the ads1256 rig, the third soil run on the evening of 2026-07-28 and the first without 'dry' in the name. It is dense: 361 points from 0.1515 to 5913 Hz. Raw |Z| falls from 12950 ohm to 615.5 ohm (median 5126), lower than the two dry runs before it, so the soil may have been wetter. The phase is clean, between -55.19 and -2.759 deg with a median of -28.49 deg, which fits soil with electrode polarisation at low frequency. The soil condition is not stated. This is the cleanest of the three soil runs from that session.","exclude_reason":null,"confidence":0.8,"zat":[[11390.4,-6.766],[9364.97,-13.34],[6502.94,-22.9],[1437.94,-49.92],null],"z1k":1437.94,"spark":[4.112,4.1,4.087,4.074,4.058,4.048,4.03,4.018,4.007,3.974,3.948,3.922,3.893,3.854,3.824,3.778,3.721,3.641,3.364,3.181,3.083,2.93,2.842,2.789],"stats":{"zmax":12949.1,"zmin":615.537,"ph_min":-55.1905,"f_ph_min":1182.7,"f_peak":316.384,"zi_peak":3246.94,"r_lo":12934.1,"r_hi":577.679}},{"file_id":171,"path":"csv_archive/testsoildry2_eis.csv","filename":"testsoildry2_eis.csv","mtime":1785290000.0,"saved_at":"2026-07-28 20:16","kind":"eis","board":"ads1256","n_points":49,"f_lo_hz":0.580098,"f_hi_hz":4853.57,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":9252.25,"median_phase_raw_deg":-18.1543,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"dry","summary":"A repeat of the dry-soil sweep on the ads1256 rig, taken 11 minutes after testsoildry: 49 points from 0.5801 to 4854 Hz. Raw |Z| goes from 17220 ohm at the low end to 1197 ohm at the high end (median 9252). The low end is close to the first run, but the high end is much higher. The median phase is -18.15 deg, yet the range of -147.6 to 173.7 deg shows several wrapped or noisy points. It is fine as a qualitative dry-soil record. Treat individual points with caution because of the phase wrapping.","exclude_reason":null,"confidence":0.85,"zat":[[16622.1,-4.356],[13948.8,-10.29],[9624.31,-20.01],[5007.95,-46.89],null],"z1k":5007.95,"spark":[4.236,4.225,4.208,4.19,4.179,4.165,4.157,4.147,4.125,4.121,4.103,4.079,4.059,4.01,4.003,3.947,3.919,3.852,3.504,3.698,3.582,3.547,2.943,3.078],"stats":{"zmax":17222.8,"zmin":802.929,"ph_min":-147.622,"f_ph_min":2009.74,"f_peak":405.903,"zi_peak":4432.17,"r_lo":17210.7,"r_hi":-951.393}},{"file_id":172,"path":"csv_archive/testsoildry_eis.csv","filename":"testsoildry_eis.csv","mtime":1785290000.0,"saved_at":"2026-07-28 20:05","kind":"eis","board":"ads1256","n_points":50,"f_lo_hz":0.151515,"f_hi_hz":5002.03,"fs_hz":null,"r_shunt_ohm":470.0,"shunts":"470","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":9646.64,"median_phase_raw_deg":-10.6426,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"soil","condition":"dry","summary":"Dry soil on the ads1256 rig: 50 points from 0.1515 Hz to 5002 Hz with a 470 ohm shunt. Raw |Z| falls from 18820 ohm at the low end to 317.8 ohm at the high end (median 9647), which is the usual soil-plus-electrode shape. The median phase is -10.64 deg and reaches -73.95 deg, but the maximum of 154.2 deg shows some wrapped or noisy points. This is the first of three soil runs that evening; testsoildry2 follows 11 minutes later. It is a reasonable record of dry soil, but the phase outliers call for some care.","exclude_reason":null,"confidence":0.85,"zat":[[16661.4,-6.1],[14211.2,-13.1],[10007.9,-31.83],[912.693,61.17],null],"z1k":912.693,"spark":[4.275,4.264,4.254,4.241,4.225,4.212,4.2,4.189,4.176,4.156,4.139,4.128,4.089,3.95,4.004,3.717,3.833,3.847,3.51,3.271,2.935,3.113,3.007,2.502],"stats":{"zmax":18815.0,"zmin":148.971,"ph_min":-73.9457,"f_ph_min":1741.84,"f_peak":609.34,"zi_peak":6602.99,"r_lo":18802.6,"r_hi":198.364}},{"file_id":52,"path":"csv_archive/47kohms_eis.csv","filename":"47kohms_eis.csv","mtime":1785090000.0,"saved_at":"2026-07-26 13:12","kind":"eis","board":"ads1256","n_points":6,"f_lo_hz":11.5877,"f_hi_hz":44.7311,"fs_hz":null,"r_shunt_ohm":null,"shunts":"470,472","cal_applied":0,"open_applied":null,"array_type":null,"median_zmag_raw":359.348,"median_phase_raw_deg":93.5259,"frac_open":0.0,"temp_c":null,"medium_tag":"","notes_tag":"","category":"resistor","condition":null,"summary":"A 47 kohm resistor according to the name ('47kohms'), measured on the original ads1256 rig. It is a very short run: 6 points between 11.59 and 44.73 Hz. Raw |Z| falls from 455.0 to 263.7 ohm (median 359.3), which by itself is fine given the gain error and ceiling. The phase is not: it runs from -98.73 to 179.1 deg with a median of 93.53 deg, which points to polarity or lead problems rather than a clean resistor. The shunt field also lists 470 and 472, so the shunt changed during the run. I trust the value in the name, but the run is not usable as a calibration standard because of the board, the phase and the tiny point count.","exclude_reason":"ads1256 board (incompatible calibration); median phase 93.53 deg (range -98.73 to 179.1) is implausible for a resistor; only 6 points over 11.59-44.73 Hz; shunt changed mid-run (470,472).","confidence":0.7,"zat":[null,null,null,null,null],"z1k":null,"spark":[2.658,2.638,2.618,2.599,2.579,2.559,2.539,2.519,2.5,2.48,2.46,2.44,2.42,2.401,2.381,2.361,2.341,2.321,2.302,2.282,2.262,2.242,2.222,2.421],"stats":{"zmax":648.111,"zmin":70.9876,"ph_min":-98.7317,"f_ph_min":44.6745,"f_peak":44.6745,"zi_peak":157.728,"r_lo":-454.952,"r_hi":23.7267}}]}