58
Troubleshooting
Symptom
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When readings from the
instrument are compared with
those of another clamp-on
current meter, the measured
values differ.
The instrument cannot accurately measure waveforms that contain a
component that falls outside the frequency characteristics range.
Since the instrument performs true RMS measurement, it can
accurately measure distorted waveforms. When measuring a distorted
waveform, the measured value will differ from a clamp-on current
meter that uses the averaging method.
The current value is larger than
expected.
A current value is displayed
even though there is no input.
The instrument cannot perform measurement accurately in the
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transformer or high-current circuit or in the presence of a strong
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A sound is being emitted by the
instrument’s jaw.
The jaw may emit sound when measuring AC currents in excess of
approx. 500 A, however, there is no effect on the measurement.
The measured value does not
appear.
No measured value is displayed,
even when the test leads are
shorted.
Zero adjustment is impossible.
Check the continuity of the test leads. (p. 24)
If a wiring break is found, replace the test leads.
Insert the test leads all the way.
Use the proper measurement method.
If no problem can be found, the instrument may be damaged. Send
the instrument for repair.
When performing current measurement, perform zero-adjustment
while no measurement target is being clamped.
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