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Table 4 Statistical comparison of repeated measurements

From: A procedure for stable electrical measurements on a rock sample against high contact resistance as a prerequisite for electrical tomography

Humidity setting (%) Mean and standard deviation Number of measurements
Four-terminal measurement Two-terminal measurement
Current (nA) Potential difference (mV) Resistance (Rmeasured) (Ω)
40 1.06 ± 0.06 166.9 ± 14.4 (1.36 ± 0.02) × 1011 6
50 1.03 ± 0.05 91.0 ± 23.2 (5.27 ± 0.97) × 1010 33
60 1.05 ± 0.04 45.4 ± 12.8 (1.36 ± 0.62) × 1010 43
70 1.06 ± 0.04 26.8 ± 11.0 (3.20 ± 1.48) × 109 39
80 1.09 ± 0.08 1.62 ± 5.94 (1.86 ± 1.20) × 108 94
90 937 ± 1 1152 ± 368 (5.53 ± 2.25) × 107 24