10.2 Effect of Eddy Currents
The AC current generated in the instrument induces eddy cur-
rents in the surrounding metallic plates, which generate induced
voltage in the test lead. Since the phase of this induced voltage
is shifted from that of the AC current (reference signal) by 180
degrees, it cannot be eliminated by the synchronous detection
circuit, resulting in measurement errors. The influence of eddy
currents is a phenomenon unique to ohmmeters that measure
resistance with AC power. To protect the test lead from such
effects, keep metallic parts, including metallic plates, at a suit-
able distance from the test lead (branched section).
10.2 Effect of Eddy Currents
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