Short note on electrode charge‐up effects in DC resistivity data acquisition using multi‐electrode arrays

The measurement sequence used in DC resistivity data using multi‐electrode arrays should be carefully designed so as to minimize the effects of electrode charge‐up effects. These effects can be some orders of magnitude larger than the induced signal and remain at significant levels for tens of minutes. Even when using a plus‐minus‐plus type of measurement cycle, one should avoid making potential measurements with an electrode that has just been used to inject current, as the decay immediately after current turn‐off is clearly non‐linear.