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Earth, Planets and Space
Fig. 7 | Earth, Planets and Space

Fig. 7

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

Fig. 7

Representative time-series data for resistance, current, and potential difference. The results are those measured for 600 s at 40% relative humidity and 30 °C using the measurement layout in Fig. 3. a Resistance between C1 and C2 measured by a resistance meter. b Current measured by an ammeter. c Potential difference between P1 and P2. The injected current took several tens of seconds to stabilise after measurement started. It was initially larger than the specified current used by the resistance meter to measure resistance in the GΩ range, and was interpreted as inrush current. This inrush current caused the resistance also to take several tens of seconds to stabilise, after which resistance increased. This was interpreted as charging. The minimum in the resistance data for 600 s is therefore considered the most representative value, because the effects of inrush current and charging are likely smallest. Current and potential difference were taken as their values at the time when resistance was lowest, as indicated by the dashed line

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