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Appendix 2 Extending the test lead and the influence of induced
voltage
The quality and structure of the test cable have a certain impact on the measurement results. If
you need to extend the test cable, please use the test cable recommended by our company.
How to reduce induced voltage
Since this meter uses AC to measure small resistance, it is susceptible to the influence of
induced voltage. The induced voltage mentioned here refers to the voltage that the current
generated by this instrument affects the signal system through the electromagnetic coupling
formed inside the wire.
Since the induced voltage and the AC current (reference signal) have a 90-degree phase angle,
when the level is small, it can be completely eliminated by the synchronous detection circuit, but
when the level is large, it will cause signal distortion and fail to perform correct synchronous
detection. The extension of the test line will increase the induced voltage. Therefore, to reduce
the level of the induced voltage, the length of the test line must be shortened as much as
possible. Especially shortening the bifurcation into two parts, the effect is better. Even if a
standard test lead is used, but in the 3
mΩ range, if the wire configuration changes significantly
during the zero adjustment and the range, the measured value will be affected by the induced
voltage and produce approximately 20dgt. fluctuations.
The content of this user manual cannot be used as a reason for using the product for special
purposes.
The company is not responsible for other losses caused by use.
The company reserves the right to modify the contents of the user manual. If there are changes,
no further notice will be given.
