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DIGITAL + ANALOGUE HIGH VOLTAGE INSULATION TESTER
OPERATOR’S MANUAL
OPERATING INSTRUCTION
4.6 USE OF GUARD TERMINAL
Illustrated in Fig. 2 is an example of the insulation resistance measurement of an electric wire. If the line
probe is simply connected to the wire conductor and the earth lead to the immersion liquid container as
shown, a measurement error will be introduced as this results in the measurement of the combined
resistance of insulation resistance and the surface leakage resistance at the cut end of the electric wire. In
order to remove this surface leakage current, wind a guard wire around the cut end of the conductor and
connect it to the guard terminal of the instrument using the guard lead. Then, the surface leakage current
will bypass the indicating meter of the insulation resistance tester.
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