HOPETECH HT3530, Руководство пользователя

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Output end outputs negative voltage and connects the negative
end of the measured part. Input end is connected to the positive
end of the measured piece.
Polar devices (electrolytic
capacitors, etc.) should be
connected according to positive
and
negative electrodes,
otherwise it will pose a threat
to personal safety.
2.
Connect non-polar parts, such as wire and cable, rubber
materials and other non-polar parts, no special requirements,
according to the following wiring test;
3. High resistance measurement, need to grounding the GND,
shielding external interference.