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Which cable in this system  is part of a ground loop?
1st step:
Link both Exciter and Detector to a power cord (see below). If Detector red LED illuminates, this power cord is part of a ground loop!
2nd step:
Leave Exciter linked to the power cord and move Detector to link other cables (see below). If Detector red LED illuminates, then linked cable is part of same ground loop as power cord! Move Detector to trace out path of ground loop. If ground loop current splits into two or more branches, meter indicates branching ratio.