Hioki CM4001 Manuale utente
CM4001 Instruction Manual
AC LEAKAGE CLAMP METER
EN
Nov. 2022 Edition 1
CM4001A963-00 22-11H
Downloadable Version
HIOKI CM4001A963-00
HIOKI CM4001A963-00
3
Introduction
Introduction
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
Product registration
Register your product in order to receive important product information.
https://www.hioki.com/global/support/myhioki/registration/
See manuals relevant to your purpose.
Manual title Available format
Instruction Manual Downloadable Version Downloadable PDF
Instruction Manual Printed
Operating Precautions (0990A909) Printed
Trademarks
• Microsoft Excel is a registered trademark or a trademark of Microsoft Corporation in the United
States and other countries.
• The Bluetooth®word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and
any use of such marks by Hioki E.E. Corporation is under license. Other trademarks and trade
names are those of their respective owners.
HIOKI CM4001A963-00
4
Making Measurements
Making Measurements
Video
Remarkable ease of use. Double your speed for checking leakage current on YouTube
Measurement procedure
1
Turn on the instrument.
The default setting of the range is AUTO. Every time you press the RANGE key, the range
switches.
Switch the range as required.
60.00 mA
AUTO 600.0 mA 6.000 A 60.00 A 600.0 A
2
Clamp the instrument around the object under measurement.
Wear appropriate protective gear such as gloves.
Clamp the instrument so that the object under measurement is located at the center of the jaws.
3
Read the measured value.
11
2
3
Press RANGE key for 1 s or more to switch between frequency measurement and
current measurement.
HIOKI CM4001A963-00
5
Making Measurements
Leakage current measurement
Single-phase 3-wire circuit
Ig
PE
Circuit
breaker
Load
equipment
: Leakage current
3-phase 3-wire circuit
Ig
PE
PE
Circuit
breaker
Load
equipment
: Leakage current
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.
HIOKI CM4001A963-00
6
Making Measurements
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 3but 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
5but location 4.
Ig
B
A
1
2 3
4 5
PE
Circuit
breaker
Load
equipment
Load
equipment
Leakage
current
:
HIOKI CM4001A963-00
7
Making Measurements
Measuring load current
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.
OK NO NO
• 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.
HIOKI CM4001A963-00
8
Filter Function (FILTER)
Filter Function (FILTER)
When an object under measurement is connected to a line that includes a switching power supply
or an inverter, high-frequency components may be superimposed on its leakage current waveform.
Using the lter function (low-pass lter) can eliminate unnecessary high-frequency components.
1
Hold down the MAX/MIN key for 1 s or more.
The [FILTER] symbol appear on the display.
(To cancel, hold down the MAX/MIN key for 1 s or more.)
The lter function startup setting can be switched on and o by turning the instrument on while
holding down the MAX/MIN key.
IMPORTANT
When the lter function is enabled, the instrument may display values lower than actual values.
If measured values greatly vary depending on the range selected manually, trust the one
measured using the upper range. For detail information, please visit our website.
GENNECT Cross > FAQ > Measured values dier greatly depending on the leakage current
meter’s measurement range.
HIOKI CM4001A963-00
9
Hold Function (HOLD)
Hold Function (HOLD)
Manual hold
You can stop the display refresh at any time.
1
Press the HOLD key.
The HOLD key lights up, and the [HOLD] symbol appears on the display.
(To cancel, press the HOLD key again.)
Auto hold
When the measured value becomes stable, the display refresh stops automatically.
1
Hold down the HOLD key for 1 s or more.
The HOLD key lights up, and the [HOLD] symbol blinks on the display.
2
Clamp the instrument around an object to be measured.
When the measured value become stable, the display refresh stops automatically.
When performing the next measurement, remove the instrument from the wire and clamp the
instrument around the object under measurement again.
(To cancel, hold down the HOLD key for 1 s or more.)
HIOKI CM4001A963-00
10
Hold Function (HOLD)
Auto-hold conditions
When both the following conditions are satised, the instrument freezes the readout.
• The measured value does not uctuate beyond the variation range for a certain period.
• The measured value exceeds the threshold value.
The instrument continues to freeze the readout until the auto-hold conditions are satised again.
Start
Stop
Start
Stop
Start
Stop
Threshold value
Example: 10.0 A
Auto hold example
50.0 A
Auto hold example
100.0 A
Measured
value
Time
(1) (2)
: Variation
〇: Held value
Start: Measurement start
(Clamped around target)
Stop: Measurement stop
(Removed from target)
(1) The instrument does not freeze the readout automatically. (The measured value does not
become less than the threshold value.)
(2) The instrument does not freeze the readout automatically. (The measured value does not
exceed the threshold value.)
The variation range and threshold value may vary depending on the range.
Range Variation width Threshold value
60.00 mA
400 counts or less
150 counts
600.0 mA
6.000 A
60.00 A
500 counts or less
600.0 A
HIOKI CM4001A963-00
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