The goal of a measurement of earth/ground resistance is determine the value of the real part of the impedance between an electrode and the conductive mass of planet earth.
Only the methods by potential drop guarantee the accuracy of a measuring earth/ground resistance.
Innovative earth/ground testers allow not disconnecting the electrode ground conductor from the master ground bar, by introducing a clamp to record the current injected into the electrode for the purpose of calculation of the value of ground resistance.
Some people want to measure the resistance of an earth/ground electrode using a Clamp-On system. This is a misconception. The system consists of two clamps coupled mechanically so as to simultaneously enlace a conductor loop. A clamp generates a current proportional to the unknown resistance of the loop and the other measuring the current loop in order to determine the loop resistance.
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