CM4001
HIOKI CM4001A963-00
Instruction Manual
Downloadable Version
AC LEAKAGE CLAMP METER
Nov. 2022 Edition 1
CM4001A963-00 22-11H
EN
HIOKI CM4001A963-00
Introduction
HIOKI CM4001A963-00
Thank you for purchasing the Hioki CM4001 AC Leakage Clamp Meter. To obtain maximum
performance from the instrument, please read this manual rst, and keep it handy for future
reference.
The latest edition of the instruction manual
The contents of this manual are subject to change, for example as a result of
product improvements or changes to specications.
The latest edition can be downloaded from Hioki’s website.
https://www.hioki.com/global/support/download
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Introduction
Manual title Available format
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Operating Precautions (0990A909) Printed
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States and other countries.
®
• The Bluetooth
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names are those of their respective owners.
word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and
3
Making Measurements
HIOKI CM4001A963-00
Making Measurements
Video
Remarkable ease of use. Double your speed for checking leakage current on YouTube
Measurement procedure
Turn on the instrument.
1
The default setting of the range is AUTO. Every time you press the RANGE key, the range
switches.
Switch the range as required.
AUTO
60.00 mA
600.0 mA 6.000 A 60.00 A 600.0 A
Clamp the instrument around the object under measurement.
2
Wear appropriate protective gear such as gloves.
Clamp the instrument so that the object under measurement is located at the center of the jaws.
Read the measured value.
3
3
2
11
4
Press RANGE key for 1 s or more to switch between frequency measurement and
current measurement.
Leakage current measurement
HIOKI CM4001A963-00
Single-phase 3-wire circuit
Circuit
breaker
: Leakage current
Ig
PE
3-phase 3-wire circuit
Making Measurements
Load
equipment
Other circuits
• Clamp around two wires together in a bundle in the single-phase 2-wire circuit.
• Clamp around four wires together in a bundle in the three-phase 4-wire circuit. Even when the
instrument cannot be clamped, you can measure leakage current using the ground wire of the
equipment instead.
IMPORTANT
• The instrument can momently display large a readout when you open and close the jaws;
however, this is not an error.
• The instrument cannot accurately make measurements in the following cases:
(1) A large current ows through adjacent wires.
(2) Special waveforms, such as that owing through the secondary side of the inverter, is
measured.
(3) The jaws close incompletely. (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, measured values will include errors and the accuracy cannot be ensured.
Circuit
breaker
: Leakage current
Ig
PE
Load
equipment
PE
5
Making Measurements
2 3
HIOKI CM4001A963-00
Locating an insulation failure (identifying GFCI and RCD trip events)
By measuring leakage current of the entire circuit using the ground wire of the transformer
(location 1 in the gure below), you can determine the presence or absence of an earth leakage in
accordance with changes in leakage current.
When you nd an earth leakage, perform the bundled measurement of all the wires from the power
supply side toward the load side to locate an insulation failure.
To investigate an intermittent earth leakage, such as intermittent ground-fault circuit
interrupter (GFCI) and residual-current device (RCD) trip events, the event recording
function will help you.
When a measured value exceeds the set threshold value, the function records the
event data (event occurrence time, event stop time, maximum value). The Z3210
Wireless Adapter (option) is required.
For detail information, please visit our website.
GENNECT Cross > Functions > Event Recording
Single-phase 3-wire circuit
• If the insulation on the wire has deteriorated at location A in the gure, you can detect the leakage
current through the measurement by clamping around bundled wires, not at location 3 but location 2.
• If the insulation on the load device has deteriorated at location B in the gure, you can detect the
leakage current through the measurement by clamping around the bundled wires, not at location
but location 4.
5
Circuit
breaker
4 5
1
A
Ig
PE
:
Leakage
current
Load
equipment
B
Load
equipment
6
Measuring load current
OK
NO
NO
HIOKI CM4001A963-00
Precautions for measuring load current
IMPORTANT
• Clamp the instrument around only one conductor wire. The instrument cannot measure load
current when clamped around two or more wires together in a bundle, regardless of the single-
phase and three-phase.
• Put the conductor perpendicular to the sensor.
• The instrument may not be able to measure rush current or signicantly uctuating current
correctly.
• The instrument can display a readout of other than zero without input at a low temperature;
however, this does not aect any measurement.
Making Measurements
• The instrument may not be able to measure special waveforms, such as those
owing through the secondary side of an inverter.
• Depending on the magnitude of the input current, the jaws may generate a sound
due to resonance; however, this does not aect any measurement.
• When you cannot nd the magnitude of an input current, disable the lter function
and start measurement using the auto range or 600.0 A range.
7
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