Hioki CM4002, Instruction Manual

Page: 45 / 104

37
Measuring Leakage Current
3
Read the current value and frequency.
RMS value of leakage current
Frequency
IMPORTANT
In the following cases, the accurate measurement may not be performed.
• A large current (around 100 A) flows through adjacent wires.
• Special waveforms, such as that flowing through the secondary side of the inverter, is measured.
• The jaws are not closed completely.
In particular, if the external dimension of the object under measurement is large, such as when the
instrument is clamped around three-phase wires together in a bundle, make sure that the jaws are closed
completely. If the jaws are even slightly open, errors occur in the measured value and the accuracy
cannot be ensured.
• The leakage current measurement at zero phase is affected by the load current. For the degree of
influence of the load current, see E12 on p. 82.
HIOKI CM4002A961-02