Applied-DC measurement method
A low-level DC voltage is applied across the system phase conductors and the ground (bond) conductor.
This measurement method is suitable for monitoring AC systems such as those with conventionally controlled motors. It is not suitable for systems with DC components, such as those with motors controlled by adjustable-speed drives.
System leakage capacitances that are present in every electrical system are simply charged to the measuring voltage and ultimately have no effect on resistance-measurement accuracy.