Hioki 3532-50 - Countermeasures against Noise from the Test Cables

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5.4 External Interference
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5.4.2 Countermeasures Against Noise from the Test Cables
Anti-interference ferrite core
If interference is producing noise in the test cables, its influence can be
moderated by the following countermeasure.
Fitting an anti-interference ferrite core on the test cables
Pass the test cables through a commercially available anti-interference ferrite
core, and fix it close to the test terminals, so as to suppress noise from the
test cables.
Moreover, if the internal diameter of the ferrite core allows, winding the test
cables several times around the ferrite core (as with the power cord as
described above) may further reduce the amount of noise.