Troubleshooting - Hioki CM4141 Bedienungsanleitung

Troubleshooting

Symptom
• When readings from the
instrument are compared with
those of another clamp-on
current meter, the measured
values differ.
• The current value is larger than
expected.
• A current value is displayed
even though there is no input.
• A sound (vibration) is being
emitted by the instrument's jaw.
• The measured value does not
appear.
• No measured value is displayed,
even when the test leads are
shorted.
• Zero adjustment is impossible.
60
Verification and/or Solution
• 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 instrument cannot perform measurement accurately in the
presence of a strong magnetic field from a source such as a nearby
transformer or high-current circuit or in the presence of a strong
electric field from a source such as a wireless device.
• If there are any wires carrying a large current near the tip of the jaws
(on the outside of the jaws), the instrument will be unable to make
accurate measurements.
• The jaw may emit sound (vibration) when measuring AC currents
in excess of approx. 500 A, however, there is no effect on the
measurement.
• Check the continuity of the test leads. (p. 23)
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.