Ground loops are a common problem in many experimental setups. A ground loop is an un-
wanted closed loop of cables in the setup, most often through the ground system. Those ground loops are often hard to find and debug. A Ground Loop Detector document describes how to build and test a simple system to detect ground loops in experimental setups. The two circuits used are from article “Simple system for locating ground loops” by P. M. Bellan. The ideas used on those articles are used in commercial product Loop Slooth. The idea in those circuits is to induce the test signal (100 kHz) into the ground system and then detect the amplitude of that signal in different parts of the setup with help of Rogowski coil based detector circuit. The basic idea in this circuit looks very promising. I have not yet tested the presented circuits, but at some laboratory tests the basic idea behind this circuit seems to work.
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