Abstract:On the premise that freqency IP and time domain IP are equivalent,the requirement of the measuring precision for electrical potential differences on the condition that the precision of the IP parameters must meet the required precision for field procedure has been studied. Although the requirement of the relative precision of potential differences in time domain IP is not high, the equipment is bulky because its supplying current is very strong. A higher relative precision of the potential differences in variable frequency method is required and it is very difficult to attain the required precision if the IP field value is low. Whereas using the dual frequency IP, much higher relative precision can be obtained since the potential differences of the two frequencies are measured simultaneously; as a result, this kind of instrument is not only portable but also meets the precision requirements satisfactorily.

Key words: measuring precision induced polarization method (IP) dual-frequency IP frequency domain IP time IP