Hioki CM4001 Bedienungsanleitung

CM4001 Instruction Manual

AC LEAKAGE CLAMP METER

Nov. 2022 Edition 1

CM4001A963-00 22-11H

Downloadable Version

HIOKI CM4001A963-00

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 specications.

The latest edition can be downloaded from Hioki’s website.

https://www.hioki.com/global/support/download

Product registration

https://www.hioki.com/global/support/myhioki/registration/

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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

Making Measurements

Video

Remarkable ease of use. Double your speed for checking leakage current on YouTube

Measurement procedure

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

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.

Read the measured value.

Press RANGE key for 1 s or more to switch between frequency measurement and

current measurement.

HIOKI CM4001A963-00

Making Measurements

Leakage current measurement

Single-phase 3-wire circuit

Circuit

breaker

Load

equipment

: Leakage current

3-phase 3-wire circuit

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

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.

2 3

4 5

Circuit

breaker

Load

equipment

Load

equipment

Leakage

current

HIOKI CM4001A963-00

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 signicantly uctuating current

correctly.

• The instrument can display a readout of other than zero without input at a low temperature;

however, this does not a󰀨ect 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 a󰀨ect 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

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.

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 di󰀨er greatly depending on the leakage current

meter’s measurement range.

HIOKI CM4001A963-00

Hold Function (HOLD)

Manual hold

You can stop the display refresh at any time.

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.

Hold down the HOLD key for 1 s or more.

The HOLD key lights up, and the [HOLD] symbol blinks on the display.

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

Hold Function (HOLD)

Auto-hold conditions

When both the following conditions are satised, 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 satised 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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