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Table 2 Accuracy specifications for resistance measurement by the electrometer (Keithley 6514)

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

Range (Ω) Resolution (Ω) Direct injection current (A)
2 × 106 1 × 101 0.9 × 10−6
2 × 107 1 × 102 0.9 × 10−6
2 × 108 1 × 103 0.9 × 10−6
2 × 109 1 × 104 0.9 × 10−9
2 × 1010 1 × 105 0.9 × 10−9
2 × 1011 1 × 106 0.9 × 10−9