Hioki CM4375, CM4376 Instruction Manual

CM4375
CM4376

AC/DC CLAMP METER

Sept. 2018 Edition 1
CM4375A961-00 18-09H

Instruction Manual



EN

Contents

Introduction ..................................................................................................... 1

Notation .......................................................................................................... 2

Verifying Package Contents ...........................................................................4

Options (sold separately)................................................................................5

Usage Notes ................................................................................................... 6

1 Overview 11

1.1 Product Overview and Features ......................................................... 11

1.2 Part Names ........................................................................................12

1

2

3

2 Making Measurements 13

2.1 Inspection Before Measurement ........................................................13

2.2 Current Measurement ........................................................................14

Manual Hold / Auto Hold ......................................................................15

Filter Function.....................................................................................18

MAX value/MIN value/AVG value/PEAK value ...................................19

Rush current (INRUSH)......................................................................20

2.3 Other Measurement Functions ........................................................... 21

2.4 Bluetooth® Communications (only for CM4376) ................................. 25

CM4375A961-00

4

5

6

Index

i

Contents

2.5 Backlight / Auto Power Save (APS) .....................................................30

2.6 Power-on Option Table ....................................................................... 31

3 Specications 33

3.1 GeneralSpecications .......................................................................33

3.2 Inputspecications/Measurementspecications ............................... 35

3.3 Accuracy Table ................................................................................... 42

4 Repairs, Inspections, and Cleaning 57

4.1 Troubleshooting .................................................................................. 57

4.2 Error display ....................................................................................... 59

4.3 Insert/Replace Batteries ..................................................................... 60

4.4 Cleaning ............................................................................................. 61

Index 63

WarrantyCerticate

ii

Introduction

Thank you for purchasing the Hioki CM4375, CM4376 AC/DC Clamp Meter. To obtain maximum
performance from the instrument over the long term, be sure to read this manual carefully and
keep it handy for future reference.
Read the separate document “Operating Precautions” carefully before using the instrument.

1

Target audience

This manual has been written for use by individuals who use the product in question or who teach
others to do so. It is assumed that the reader possesses basic electrical knowledge (equivalent
to that of someone who graduated from the electrical program at a technical high school).

Trademark

• Bluetooth® is a registered trademark of Bluetooth SIG, Inc.(USA). The trademark is used by
HIOKI E.E. CORPORATION under license.

• Android, Google Play, and Google Chrome are trademarks of Google, Inc.

• IOS is a registered trademark of Cisco Systems, Inc. and/or its afliates in the United States
and certain other countries.

• iPhone, iPad, iPad miniTM, iPad Pro, and iPod touch are trademarks of Apple Inc.

• The App Store is a service mark of Apple Inc.

• Any other products and company names are generally either trade names, registered
trademarks or trademarks of respective companies.

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Notation

Notation

Symbols afxed to the instrument

Indicates cautions and hazards. Refer to the "Usage Notes" (p. 6) section of the instruction
manual and the included “Operating Precautions” for more information.

Indicates that the instrument may be connected to or disconnected from a live conductor.

Screen display

The instrument screen displays the alphanumeric characters as follows.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

1 2 3 4 5 6 7 8 9 0

A different display is used in the case below.

: Wiring break detected

2

Notation

Accuracy

We dene measurement tolerances in terms of f.s. (full scale), rdg. (reading) and dgt. (digit) values with the

following meanings:

f.s. (maximum display value/range)

The maximum displayable value. This is usually the name of the currently selected range.

1

rdg. (displayed value)

The value currently being measured and displayed on the measuring instrument.

dgt. (resolution)

The smallest displayable unit on a digital measuring instrument, i.e., the input value that causes

the digital display to show a “1” as the least-signicant digit.

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3

Verifying Package Contents

L4937 マグネットアダプ
タ

L4934 小ワニグチ

マグネ付ストラップ

Verifying Package Contents



Model CM4375 or CM4376



AC/DC Clamp Meter

Model L9207-10 Test Lead



Model C0203 Carrying Case



LR03 Alkaline battery ×2



Instruction Manual*



Operating Precautions (0990A907)



Precautions Concerning Use of
Equipment that Emits Radio Waves (only
for model CM4376)

* Instruction manuals may also be available in other languages.

Please visit our website at http://www.hioki.com

4

Options (sold separately)

9243 graber

L4937 マグネットアダプ
タ

L4934 小ワニグチ

マグネ付ストラップ

DM4910 熱電対

DT4911TestLead

DT4912TestLead

L4930 接続ケーブル

9243 graber

L4937 マグネットアダプ
タ

L4934 小ワニグチ

マグネ付ストラップ

L9207-10

DM4910 熱電対

DT4911TestLead

DT4912TestLead

L4930 接続ケーブル

L4931renketu

9243 graber

L4937 マグネットアダプ
タ

L4934 小ワニグチ

マグネ付ストラップ

L9207-10

DM4910 熱電対

DT4911TestLead

DT4912TestLead

L4930 接続ケーブル

L4931renketu

L4931 延長ケーブル

L4932(+9207-10cap)

L4933 コンタクトピン

L4935 ワニ口

9243 graber

L4937 マグネットアダプ

9243 graber

L4937 マグネットアダプ
タ

L4934 小ワニグチ

マグネ付ストラップ

L9207-10

DM4910 熱電対

DT4911TestLead

DT4912TestLead

L4930 接続ケーブル

L4931renketu

L4931 延長ケーブル

L4932(+9207-10cap)

L4933 コンタクトピン

L4935 ワニ口

L4936 バスバー

L4937 マグネットアダプ
タ

9243 graber

L4937 マグネットアダプ
タ

L4934 小ワニグチ

マグネ付ストラップ

L9207-10

DM4910 熱電対

DT4911TestLead

DT4912TestLead

L4930 接続ケーブル

L4931renketu

L4931 延長ケーブル

L4932(+9207-10cap)

9243 graber

L4937 マグネットアダプ
タ

L4934 小ワニグチ

マグネ付ストラップ

L9207-10

DM4910 熱電対

DT4911TestLead

DT4912TestLead

L4930 接続ケーブル

L4931renketu

L4931 延長ケーブル

L4932(+9207-10cap)

L4933 コンタクトピン

L4937 マグネットアダプ
タ

L4934 小ワニグチ

L4937 マグネットアダプ
タ

L4934 小ワニグチ

マグネ付ストラップ

9243 graber

L4937 マグネットアダプ
タ

DM4910 熱電対

Options (sold separately)

L9207-10 Test Lead

L4930 Connection Cable Set
(Length: 1.2 m)

L4931 Extension Cable Set *
(Length: 1.5 m, with the coupling
connector)

DT4910 Thermocouples (K)

C0203 Carrying Case

*1: CAT IV 600 V/ CAT III 1000 V/ CAT II 1000 V *5: CAT III 300 V/ CAT II 600 V
*2: CAT IV 600 V/ CAT III 1000 V *6: 33 V AC/ 70 V DC
*3: CAT III 1000 V *7: CAT III 600 V/ CAT II 600 V
*4: CAT III 600 V *8: CAT IV 1000 V

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*

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*

2

L4933 Contact Pin Set

L4934 Small Alligator Clip Set

L4935 Alligator Clip Set

9243 Grabber Clip

L4936 Bus Bar Clip Set

L4937 Magnetic Adapter Set

9804 Magnetic Adapter *

L4932 Test Pin Set

L4938 Test Pin Set

L4939 Breaker Pin Set

6

*

2

*

3

*

4

*

8

1

*

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*

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5

*

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3

3

*

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*

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5

Usage Notes

Usage Notes

Follow these precautions to ensure safe operation and to obtain the full benets of the various

functions. Read the separate document “Operating Precautions” carefully before using the

instrument. Ensure that your use of the product falls within the specications not only of the

instrument itself, but also of any accessories, options, batteries, and other equipment being
used.

DANGER

• To prevent an electric shock, do not touch any areas beyond the barrier

while the instrument is in use.

See: "1.2 Part Names" (p. 12)

• The maximum measurement current varies with the frequency, and the

current that can be measured continuously is limited. Operating the
instrument at less than this limitation is referred to as derating. Do not
measure currents in excess of the derating curve. Doing so may result in
instrument damage or malfunction, a re, or burn due to sensor heating.

• To prevent an electric shock, conrm that the white portion (insulation layer)

inside the cable is not exposed. If a color inside the cable is exposed, do not
use the cable.

6

Usage Notes

WARNING

• Do not allow the instrument to get wet, and do not take measurements with

wet hands. This may cause an electric shock. (This precaution does not

apply to insulated conductors.)

• To prevent an electric shock, do not exceed the lower of the ratings shown

on the instrument and test leads.

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2

CAUTION

Do not place any foreign object between the jaws or any insert foreign
object into the gap of the sensor head. Doing so may worsen the
performance of the sensor or the opening-closing operation of the
sensor head.

Avoid dropping or jarring the instrument, which could damage the jaw,
adversely affecting measurement.

Attach the clamp around only one conductor. If you clamp single-

phase (2-wire) or three-phase (3-wire) conductors together, the
instrument will not be able to make a measurement.

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Usage Notes

Test Lead

To prevent an electric shock, when measuring the voltage of a power line use a
test lead that satises the following criteria:

The optional test leads provided for the instrument conform to the safety
standard EN61010. Use a test lead in accordance with its dened measurement

category and rated voltage.

The cable is hardened in freezing temperatures. Do not bend or pull it to avoid tearing
its shield or cutting cable.

8

WARNING

• Conforms to safety standards IEC61010 or EN61010

• Measurement category III or IV

• Its rated voltage is higher than the voltage to be measured

• To prevent a short-circuit accident, be sure to use the test leads with the

sleeves attached when performing measurements in the CAT III and CAT IV

measurement categories.

• If the sleeves are removed during measurement, stop the measurement.

CAUTION

Model L4937, 9804 Magnetic Adapter Set (optional)

Usage Notes

DANGER

P

ersons wearing electronic medical devices such as a pacemaker should not
use the Magnetic Adapter Set. Such persons should avoid even proximity to the
Magnetic Adapter Set, as it may be dangerous. Medical device operation could be
compromised, presenting a hazard to human life.

CAUTION

• Do not subject the Magnetic Adapter Set to mechanical shock, for example, due to
dropping it. Shock can cause it to be chipped or cracked.

• Do not use the Magnetic Adapter Set in locations where it may be exposed to
rainwater, dust, or condensation. In those conditions, the Magnetic Adapter Set
may be decomposed or deteriorated. The magnet adhesion may be diminished. In
such case, the instrument may not be hung in place and may fall.

• Do not bring the Magnetic Adapter Set near magnetic storage device such as

oppy disks, magnetic cards, pre-paid cards, or magnetized tickets. Doing so may

corrupt and may render them unusable. Furthermore, if the Magnetic Adapter
Set is brought near precision electronic equipment such as PCs, TV screens, or
electronic wrist watches, they may fail.

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Usage Notes

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1

Overview

1.1 Product Overview and Features

This instrument is a clamp meter that can
perform true RMS measurement of current
simply by clamping it around a circuit. In
addition to current, it provides voltage
measurement, frequency measurement, rush
current measurement, resistance measurement,
diode measurement, capacitance measurement,
temperature measurement, and DC power
measurement.
Model CM4376 also provide Bluetooth®
communications functionality, allowing
measurement data to be monitored and logged
from a mobile device.

Measurement function list

DC current/DC voltage, DC power

Capacitance, temperature

Continuity check, resistance, diode

AUTO AC/DC, AC voltage, DC
voltage, AC+DC voltage, frequency

AUTO AC/DC, AC current, DC
current, AC+DC current, frequency

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Overview

1.2 Part Names

Front Rear

1

2

3

(CM4376)

12

1 Operation grip

2 Jaw open/closed mark

(The jaws are open if the mark is not

4

5

6

7

8

9

10

11

12

showing.)

3 SHIFT key

(Selects function indicated in blue lettering.)

4 Jaw

5 Barrier

6 Serial number (The serial number consists of

9 digits. The rst two (from the left) indicate

the year of manufacture, and the next two
indicate the month of manufacture.)

7 Rotary switch

8 HOLD key

9 LCD

10 Battery cover

11 Operation keys

12 Measurement terminals

2

NO

NONO

Making Measurements

2.1 Inspection Before Measurement

Check if there is any damage to the instrument occurred during storage or shipping and

verify that instrument operates normally before using it. If you nd any damage, contact your

authorized Hioki distributor or reseller.

Check item

The battery cover is closed and its screw has



been securely tightened.

There is no foreign matter on the



measurement terminals. (p. 12)

The test leads are not broken.



1 Ω or less

OK

There is no damage to the test lead



insulation, and neither the white sheathing nor

metal conductor inside the wire are exposed.

The instrument is neither damaged nor cracked.



No indicators are missing.



(All lit up)

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Current Measurement

2.2 Current Measurement

1

2

Press for 1 sec.

Zero adjustment



Frequency detection range of AC current

5.0 A or more

DC current polarity detection function
(p. 31)

If the measured value is negative, the
buzzer will sound, and the display will turn
red (threshold: −10 A).

14

3

Clamp the instrument around a conductor.Turn the rotary switch.

4

AUTO

(AUTO AC/DC)

e.g.: 3P4W (3-phase, 4-wire) circuit

breaker (AC current measurement)

Be sure that the currents
direction points the arrow.

(AC A)

(AC+DC A)(DC A)

Hz

(Frequency)

Manual Hold / Auto Hold

Current Measurement

Manual hold Auto hold

Press for 1 sec.

Measured value



retains.

Pressing the HOLD key again cancels
the measured value hold function.

(Measured value stabilizes.)

Measured value automatically retains.

Pressing the HOLD key for 1 sec. cancels the auto
hold function.

1



blinks.

2

Clamp the instrument around a
conductor.

3

4

Disconnect

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15

Current Measurement

Auto hold conditions

Display value updates are stopped when the following two conditions are satised:

• When the measured value exceeds the threshold value described in the table in the next page. (voltage,
current). When the measured value is less than the threshold value described in the table in the next page.

(resistance, continuity, diode)

• When the range over which the measured value is uctuating stabilizes within the uctuation range
described in the table in the next page.

Held measured value

Measured
value

Auto hold
e.g.: 100.0 A

Fluctuation range

Fluctuation range

Auto hold
e.g.: 99.0 A

Fluctuation range

Threshold
e.g.: 12.0 A

Start

End

If the measured value falls below the threshold value (voltage, current) or exceeds the threshold value
(resistance, continuity, diode) after display value updates are stopped, the display value update is restarted.

Display value updates will stop if the two conditions are satised once again.

End

Start

Measurement

End

Start

Time

16

Current Measurement

Measurement function Fluctuation range Threshold value

AUTO A
AC current
DC current
AC+DC current

AC voltage
DC voltage
(excluding the 600.0 mV range)
AC+DC voltage

Resistance
Continuity

Diode 1.800 V range: within 40 counts 1.800 V range: 1460 counts

The auto hold function only operates for the above measurement functions.

Within 120 counts 120 counts

6.000 V/60.00 V/600.0 V range:
within 120 counts
1000 V range: within 20 counts
1500 V range: within 30 counts

/6.000 kΩ/60.00 kΩ/

600.0

Ω

600.0 k

Ω range: within 100 counts

6.000 V/60.00 V/600.0 Vrange:
120 counts
1000 V range: 20 counts
1500 V range: 30 counts

600.0 Ω/6.000 kΩ/60.00 kΩ/

600.0 k

Ω range: 4900 counts

17

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Current Measurement

Filter Function

FILTER OFF FILTER ON

Measured value including noise

Press for 1 sec.

Measured value with reduced noise

Frequency characteristics when using the

lter function (100 A input)

FILTER OFF

FILTER ON Passband 100 [Hz]

Measured value [A]

Frequency [Hz]

18

Turn off the lter function when performing

measurement of power supply frequencies in excess

of 100 Hz, for example on an aircraft or ship.

Filter OFF

MAX value/MIN value/AVG value/PEAK value

1

Clamp the instrument around a conductor.

Current Measurement

1

2

3

4

The instrument
performs true RMS
measurement.

“AVG” indicates
the average of all
measured values.

(AUTO AC/DC)

Measured value retains.



(AC A)

PEAK MIN

(AC+DC A)(DC A)

PEAK MAX

MAX

HzAUTO

(Frequency)

MIN

Can not be used at
AUTO AC/DC.

Press for 1 sec.

Cancel



Waveform

Measured value
(RMS value)

Display refresh interval

19

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Current Measurement

Rush current (INRUSH)

1

Turn off the motor.

2

Turn the rotary switch.

3

Press for 1 sec.

 Zero adjustment

4

Clamp the instrument around a
conductor.

Trigger level: ±10 A

20

5

Press for 1 sec.

INRUSH ON



6

Turn on the motor.

RMS value (INRUSH)

Example
screen: 100 A

AC current

Example screen: 250 A

Maximum wave height (PEAK)

Interval during which rush

current occurs

(Dozens to hundreds of

milliseconds in duration)

(Rush current

occurrence)

RMS value (INRUSH)

DC current

Maximum wave height (PEAK)

Interval during which rush

current occurs

(Dozens to hundreds of

milliseconds in duration)

2.3 Other Measurement Functions

Other Measurement Functions

Voltage

e.g.: commercial power supply (AC voltage measurement)

2 3

1

Red Black

Do not touch.No overvoltage

NO

(Red ash)

NO

DC voltage polarity detection function (p. 31)

If the measured value is negative, the buzzer will sound,
and the display will turn red (threshold: −10 V).

AUTO

Hz

Switch the range

(AUTO AC/DC)

(AC V)

(DC V)

(AC+DC V)

(Frequency)

1



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Other Measurement Functions

Continuity Check

1

Zero adjustment

Press for 1 sec.

2

Red

Black Black Black

(Red display)

Resistance

1

Zero adjustment

Press for 1 sec.

2

Red Red

22

Diode

Other Measurement Functions

Capacitance

Red Black

Temperature

Model DT4910
Thermocouples (K)

−

+

Red

Black

: DT4910 is broken.

To change the temperature display unit: p. 32

23

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Other Measurement Functions

Simultaneous display of

DC current and DC voltage

Red

Black

24

e.g.: Solar power system maintenancee.g.: Checking a car battery

DC power

Black

Red

Bluetooth® Communications (only for model CM4376)

2.4 Bluetooth® Communications (only for model CM4376)

The CM4376 are clamp-style meters with Bluetooth (Bluetooth low energy) support. When the Bluetooth

function is enabled, you can review measurement data and create measurement reports on mobile devices
(iPhone, iPad, iPad mini
functionality, see the Help function in the application software GENNECT Cross.

Install the GENNECT Cross on your mobile device. (p. 26)

1

Enable the Bluetooth function on the CM4376. (p. 27)

2

Launch the GENNECT Cross and pair it with the CM4376. (p. 28)

3

Select the General Measurement, Logging (Recording), or

4

Waveform Graph function. (p. 29)

TM

, iPad Pro, iPod touch, and AndroidTM devices). For more information about this

Press for 1 sec.

25

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Bluetooth® Communications (only for model CM4376)

Installing the application software GENNECT Cross

Search for “GENNECT Cross” on the App Store from your iPhone, iPad or other Apple device, or on Google

TM

from your Android device. Then download and install the GENNECT Cross. You will need an Apple ID

Play

to download the app on the App Store, or a Google account to download the app on Google Play. For more
information about how to register an account, contact the store at which you purchased your device.

• Because the CM4376 emit radio waves, use in a country or region where they have not been approved may
be subject to nes or other penalties as a violation of applicable laws or regulations. For more information,

see the attached “Precautions Concerning Use of Equipment that Emits Radio Waves” or go to our website.

• The CM4376 availability is limited to certain countries. For more information, contact your authorized Hioki
distributor or reseller.

• The distance over which data can be sent and received using Bluetooth varies greatly depending on

whether there are any obstructions between the paired instruments (for example, walls, metal barriers, etc.)
and on the distance between the instrument and the oor (or ground). To ensure stable measurement, verify

adequate signal strength.

• Although this application software is provided free of charge, downloading or using the application software
may incur Internet connection charges. Such charges are the sole responsibility of the user.

• This application software is not guaranteed to operate on all mobile devices.

26

Bluetooth® Communications (only for model CM4376)

Turning on the Bluetooth function

Bluetooth function OFF Bluetooth function ON

1

2

Press for 1 sec.

lights up: Bluetooth function ON

ashes: Sending/receiving data

27

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Bluetooth® Communications (only for model CM4376)

Pairing the app with the CM4376

2

3

1

• When the app is launched for the rst time (before being paired with any instrument), the Instrument

Settings screen will be displayed.

• While the mobile device is displaying the Instrument Settings screen, simply move it close to a CM4376 to
automatically pair it with the instrument (the app can be paired with up to 8 instruments).

• Allow about 5 to 30 seconds for the CM4376 to pair with the app after being turned on. If the instrument fails

to pair within 1 minute, relaunch GENNECT Cross and cycle the instrument’s power.

28

Bluetooth® Communications (only for model CM4376)

Making measurements with the Bluetooth function

Select the General Measurement, Logging (Recording), or Waveform Graph function on the Home screen.
For more information about each function, see the Help function in the GENNECT Cross.

General Measurement

Saves measured values from

multiple channels

Logging (Recording)

Simple logging (up to 24 hours)

Waveform Graph

Simple oscilloscope

(voltage/current)

29

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Backlight / Auto Power Save (APS)

2.5 Backlight / Auto Power Save (APS)

Backlight Auto Power Save (APS)

Backlight OFF

Backlight ON
Automatically switched off when
the instrument is not in use for
40 sec.

The instrument is automatically turned off.

To restart the instrument, briey set the rotary switch to “OFF.”

30

(Always on)
Cancelation method: (p. 31)

No operation
for 15 min.

You can turn the display back on
by pressing a key or by turning the
rotary switch.

No operation for 45 min.

2.6 Power-on Option Table

Power-on Option Table

+

Canceling the auto power save (APS)
function (OFF)

DC current and DC voltage polarity
detection function (ON/OFF)

Displaying all indicators
(Version of software/Model number/
Serial number)

Buzzer sound (ON/OFF)

Automatic backlight deactivation
(ON/OFF)

Move the rotary switch from the “OFF” position to any of the test mode positions
while pressing an operation key.

Setting Operating instruction

Factory

setting

ON

OFF Yes

– –

ON Yes

ON Yes

retained?

(Set each time)

Setting

No

31

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Power-on Option Table

Setting Operating instruction

Switching the temperature unit

32

Press for 1 sec.

To change the
temperature unit:

To save the setting:

Press for 1 sec.

Factory

setting

°C Yes

Setting

retained?

3

Specications

3.1 General Specications

Operating environment Indoors, pollution degree 2, altitude up to 2000 m (6562 ft.)

Operating temperature
and humidity

Storage temperature
and humidity

Dustproof and
waterproof

Standards Safety EN 61010

Power supply LR03 alkaline battery ×2

Continuous operating
time

Interface (only for

CM4376)

−25°C to 65°C (−13°F to 149°F), 90% RH or less (no condensation)

−30°C to 70°C (−22°F to 158°F), 90% RH or less
(no condensation, when batteries are removed)

IP20 (Measuring voltage or current in a hazardous live conductor while
completely dry)
IP50 (Measuring resistance while completely dry)
IP54 (During storage and while measuring current in an insulated conductor)

EMC EN 61326

Rated supply voltage: 1.5 V DC ×2

Approx. 40 hours (Bluetooth communication OFF)
Approx. 20 hours (Bluetooth communication ON)
(100 A AC measurement, LCD backlight OFF, at 23°C [ 73.4°F ])

Bluetooth 4.0 LE

(p. 25)

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General Specications

Dimensions Approx. 65W × 242H × 35D mm (2.56″W × 9.53″H × 1.38″D) (excluding

Jaw dimensions Approx. 53W × 20D mm (2.09″W × 0.79″D)

Jaw cross-sectional
minimum dimension

Maximum measurable
conductor diameter

Mass Approx. 330 g (11.6 oz.) (excluding batteries)

Product warranty
period

Accessories See: "Verifying Package Contents" (p. 4)

Options See: "Options (sold separately)" (p. 5)

protruding parts, operation grip, and jaw)

Approx. 9.5 mm (0.37″)

34 mm (1.34″)

φ

3 years
Number of jaw open/close cycles: 30,000

34

Input specications/Measurement specications

3.2 Input specications/Measurement specications

(1) Basic Specications

Measurement range See "3.3 Accuracy Table" (p. 42)

Maximum rated voltage
to terminal

Maximum rated voltage
to earth

Measurement method True RMS measurement

Measurement terminals COM terminal and V terminal

1000 V AC (up to 1 kHz)
1700 V DC

600 V AC (Measurement category IV)
1000 V AC (Measurement category III)
Anticipated transient overvoltage: 8000 V

(2) Current measurement specications

Maximum input current See the frequency derating characteristics (p. 37)

Coupling type AC current *

Other current measurements than
the above

1

AC coupling

DC coupling

35

1

2

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Input specications/Measurement specications

Display update rate *2AUTO A/AC current/DC current/

Zero-display range AUTO A/AC current/DC current/

Crest factor AUTO A/AC current/AC+DC current/

Frequency detection
input level

INRUSH

Trigger level

Peak detection time
width

*1: Does not apply to AC detection in AUTO A mode.
*2: Does not include range change time.

AC+DC current

Current frequency 0.3 times to 5.0 times/sec. (varies

DC power 1 time/sec.

DC current+DC voltage 2.5 times/sec.

AC+DCcurrent

INRUSH (inrush current)

1000 A range 5.0 A or more

+10 A or more or 10 A or less

1 ms or more (when lter is off)

36

5 times/sec.

depending on the frequency.)

5 counts or less

1.5 (1000 A or less)

Frequency derating characteristics

Input specications/Measurement specications

1

2

Measurement current [A]

Frequency [Hz]

(3) Voltage measurement specications

Overload protection 1870 V DC

Coupling type AC voltage *

Input impedance See "3.3 Accuracy Table" (p. 42)

Lower of 1100 V AC or 2×10
(Applied continuously for up to 1 min.)

1

Other voltage measurements
than the above

7

V · Hz

AC coupling

DC coupling

37

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4

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Input specications/Measurement specications

Display update rate *2AUTO V/AC voltage/

Zero-display range AUTO V/AC voltage/

Crest factor AUTO V/AC voltage/

Peak detection time
width

Frequency detection
input level

3

CMRR *

4

NMRR *

DC voltage/AC+DC voltage

Voltage frequency 0.3 times to 5.0 times/sec. (varies depending on

DC power 1 time/sec.

DC current+DC voltage 2.5 times/sec.

AC+DC voltage

AC+DC voltage

1 ms or more (when lter is off)

10% or more of each range f.s.

AC voltage/AC+DC voltage −60 dB or more

DC voltage −100 dB or more

DC voltage −60 dB or more

38

5 times/sec.

the frequency.)

5 counts or less

6.000 V range/60.00 V range/600.0 V range:
3 (4000 counts or less)
2 (4001 counts or more, 6000 counts or less)

1000 V range:
2 (850 V or less)

1.7 (851 V or more, 1000 V or less)

Input specications/Measurement specications

*1: Does not apply to AC detection in AUTO V mode.
*2: Does not include range change time.
*3: Dened for 1 k
*4: Dened for 50 Hz/60 Hz input

unbalance, 0 Hz/50 Hz/60 Hz input

Ω

(4) Other Measurement Specications

Overload
protection

Overload current At steady state: 30 mA or less

Display update

1

rate*

Response time Continuity check Detection of open or short for 0.5 ms or more

Open terminal
voltage

Continuity on
threshold

Continuity off
threshold

1700 V DC
Lower of 1000 V AC or 2×10
(Applied continuously for up to 1 min.)

At transient state: 1.5 A or less

Capacitance 0.5 times to 5.0 times/sec. (varies depending on

Temperature (Thermocouples [K])

Continuity check/resistance/diode 2.0 V DC or less

±10 Ω (continuous buzzer sound, red warning backlight lights up)

25

Ω

±10

245

Ω

Ω

7

V · Hz

the capacitance)

1 time/sec. (including check for thermocouple
wiring breaks)

39

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Input specications/Measurement specications

Maximum capacity
load

Maximum inductive
load

Instrument
reference contact
temperature
correction
stabilization time

*1: Does not include range change time.

10 mF

10 H

Up to 120 minutes (Reference: For an instrument at 23°C [ 73°F ] placed in a 65°C
[ 149°F ] environment: 60 minutes)

40

(5) Accuracy specications

Conditions of
guaranteed
accuracy

Conditions of
accuracy input

Measurement
accuracy

Effects of conductor
position *

Temperature
coefcient

*1: At all positions around the jaw’s center-point reference

1

Guaranteed accuracy

period

Guaranteed accuracy

period after adjustment

made by Hioki

Guaranteed accuracy for
temperature and humidity

(Current/continuity check/resistance: after zero adjustment has been performed)
(Use model DT4910 for temperature (Thermocouples [K])

Sine wave input

See "3.3 Accuracy Table" (p. 42)

Within ±1.5% rdg. (for cables of φ11 mm or more)

Add “measurement accuracy × 0.1/°C” (excluding 23°C±5°C [ 73°F±9°F ]).

1 year (accuracy shown in accuracy table)
3 years (accuracy shown in accuracy table × 1.5) (reference
values)

1 year

23°C±5°C (73°F±9°F), 90% RH or less (no condensation)

Input specications/Measurement specications

41

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Accuracy Table

3.3 Accuracy Table

(1) AUTO A (AC/DC current automatic detection)

During AC detection: Conforms to accuracy specications described in "(4) AC+DC current" (p. 44).
During DC detection: Conforms to accuracy specications described in "(3) DC current" (p. 43).

(2) AC current

Measurement value/MAX/MIN/AVE

Accuracy guarantee range

(Resolution)

1.0 A to 30.0 A (0.1 A) 10 Hz ≤ f < 45 Hz ±1.8% rdg.±1.0 A ±2.3% rdg.±1.0 A

30.1 A to 900.0 A (0.1 A) 10 Hz ≤ f < 45 Hz ±1.8% rdg.±0.5 A ±2.3% rdg.±0.5 A

900.1 A to 999.9 A (0.1 A) 10 Hz ≤ f < 45 Hz ±2.3% rdg.±0.5 A ±2.8% rdg.±0.5 A

Accuracy guarantee

frequency range

45 Hz ≤ f ≤ 66 Hz ±1.3% rdg.±0.8 A ±1.8% rdg.±0.8 A
66 Hz < f ≤ 1 kHz ±2.0% rdg.±1.0 A –

45 Hz ≤ f ≤ 66 Hz ±1.3% rdg.±0.3 A ±1.8% rdg.±0.3 A
66 Hz < f ≤ 1 kHz ±2.0% rdg.±0.5 A –

45 Hz ≤ f ≤ 66 Hz ±1.8% rdg.±0.3 A ±2.3% rdg.±0.3 A
66 Hz < f ≤ 1 kHz ±2.5% rdg.±0.5 A –

Measurement accuracy

Filter OFF Filter ON

42

PEAK MAX/PEAK MIN

Accuracy guarantee range (Resolution)

±10 A to ±1000 A (1 A) 10 Hz ≤ f < 45 Hz ±1.8% rdg.±7 A

±1001 A to ±1500 A (1 A) 10 Hz ≤ f < 45 Hz ±2.3% rdg.±7 A

Accuracy guarantee

frequency range

45 Hz ≤ f ≤ 66 Hz ±1.3% rdg.±7 A
66 Hz < f ≤ 1 kHz ±2.0% rdg.±7 A

45 Hz ≤ f ≤ 66 Hz ±1.8% rdg.±7 A
66 Hz < f ≤ 1 kHz ±2.5% rdg.±7 A

Measurement accuracy

Accuracy Table

1

2

(3) DC current

Measurement value/MAX/MIN/AVE

Accuracy guarantee range (Resolution) Measurement accuracy

±1.0 A to ±30.0 A (0.1 A) ±1.3% rdg.±0.8 A
±30.1 A to ±999.9 A (0.1 A) ±1.3% rdg.±0.3 A

PEAK MAX/PEAK MIN

Accuracy guarantee range (Resolution) Measurement accuracy

±10 A to ±1000 A (1 A) ±1.3% rdg.±7 A

±1001 A to ±1500 A (1 A) ±1.8% rdg.±7 A

43

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Accuracy Table

(4) AC+DC current

Measurement value/MAX/MIN/AVE

Accuracy guarantee

range (Resolution)

1.0 A to 30.0 A (0.1 A) 10 Hz ≤ f < 45 Hz ±1.8% rdg.±1.2 A ±2.3% rdg.±1.2 A

30.1 A to 900.0 A (0.1 A) 10 Hz ≤ f < 45 Hz ±1.8% rdg.±0.7 A ±2.3% rdg.±0.7 A

900.1 A to 999.9 A (0.1 A) 10 Hz ≤ f < 45 Hz ±2.3% rdg.±0.7 A ±2.8% rdg.±0.7 A

Accuracy guarantee

frequency range

DC, 45 Hz ≤ f ≤ 66 Hz ±1.3% rdg.±1.8 A ±1.8% rdg.±1.8 A
66 Hz < f ≤ 1 kHz ±2.0% rdg.±1.2 A –

DC, 45 Hz ≤ f ≤ 66 Hz ±1.3% rdg.±1.3 A ±1.8% rdg.±1.3 A
66 Hz < f ≤ 1 kHz ±2.0% rdg.±0.7 A –

DC, 45 Hz ≤ f ≤ 66 Hz ±1.8% rdg.±1.3 A ±2.3% rdg.±1.3 A
66 Hz < f ≤ 1 kHz ±2.5% rdg.±0.7 A –

Measurement accuracy

Filter OFF Filter ON

PEAK MAX/PEAK MIN

Accuracy guarantee range (Resolution)

±10 A to ±1000 A (1 A) 10 Hz ≤ f < 45 Hz ±1.8% rdg.±7 A

±1001 A to ±1500 A (1 A) 10 Hz ≤ f < 45 Hz ±2.3% rdg.±7 A

Accuracy guarantee

frequency range

DC, 45 Hz ≤ f ≤ 66 Hz ±1.3% rdg.±7 A
66 Hz < f ≤ 1 kHz ±2.0% rdg.±7 A

DC, 45 Hz ≤ f ≤ 66 Hz ±1.8% rdg.±7 A
66 Hz < f ≤ 1 kHz ±2.5% rdg.±7 A

Measurement accuracy

44

Accuracy Table

(5) Current frequency/Voltage frequency

Range (Auto-range threshold)

9.999 Hz (more than 9999 counts) 1.000 Hz to 9.999 Hz (0.001 Hz) ±0.1% rdg.±0.003 Hz

99.99 Hz (more than 9999 counts/

less than 900 counts)

999.9 Hz (less than 900 counts) 1.0 Hz to 999.9 Hz (0.1 Hz) ±0.1% rdg.±0.1 Hz

Accuracy guarantee range

(Resolution)

1.00 Hz to 99.99 Hz (0.01 Hz) ±0.1% rdg.±0.01 Hz

Measurement accuracy

(6) INRUSH (Rush current)

INRUSH measurement value

Accuracy guarantee range (Resolution)

10.0 A to 999.9 A (0.1 A) DC, 20 Hz ≤ f ≤ 500 Hz ±5.0% rdg.±1.3 A

Accuracy guarantee

frequency range

Measurement accuracy

1

2

3

4

INRUSH PEAK value

Accuracy guarantee range (Resolution)

±10 A to ±1000 A (1 A) DC, 20 Hz ≤ f ≤ 500 Hz ±6.0% rdg.±10 A
±1001 A to ±1500 A (1 A) DC, 20 Hz ≤ f ≤ 500 Hz ±8.0% rdg.±10 A

Accuracy guarantee

frequency range

Measurement accuracy

45

5

6

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Accuracy Table

(7) AUTO V (AC/DC voltage automatic detection)

During AC detection: Conforms to accuracy specications described in "(10) AC+DC voltage" (p. 51).
During DC detection: Conforms to accuracy specications described in "(9) DC voltage" (p. 49).

(8) AC voltage

Measurement value/MAX/MIN/AVE

Range

(Auto-range

threshold)

6.000 V (more

than 6000
counts)

Accuracy

guarantee range

(Resolution)

0.000 V to 0.299
V (0.001 V)

0.300 V to 6.000
V (0.001 V)

Accuracy guarantee

frequency range *

15 Hz ≤ f < 45 Hz ±1.5% rdg.

45 Hz ≤ f ≤ 66 Hz ±0.9% rdg.

66 Hz < f ≤ 1 kHz ±1.5% rdg.

15 Hz ≤ f < 45 Hz ±1.5% rdg.

45 Hz ≤ f ≤ 66 Hz ±0.9% rdg.

66 Hz < f ≤ 1 kHz ±1.5% rdg.

Measurement accuracy

1 *2

Filter OFF Filter ON

±0.015 V

±0.013 V

±0.015 V

±0.005 V

±0.003 V

±0.005 V

±2.0% rdg.
±0.015 V

±1.4% rdg.
±0.013 V

–

±2.0% rdg.
±0.005 V
±1.4% rdg.
±0.003 V

–

impedance *

3.2 M

3.2 M

46

Input

±5%

Ω

±5%

Ω

3

Accuracy Table

Range

(Auto-range

threshold)

60.00 V

(more than
6000 counts/
less than 540
counts)

600.0 V

(more than
6000 counts/
less than 540
counts)

1000 V
(less than 540
counts)

*1: Frequency range of 15 Hz ≤ f < 20 Hz is designed value.
*2: Within the frequency range of f < 45 Hz, the accuracy guarantee assumes a superposed DC voltage of

less than 500 V.

*3: At 50 Hz AC.

Accuracy

guarantee range

(Resolution)

3.00 V to 60.00 V
(0.01 V)

30.0 V to 600.0 V
(0.1 V)

50 V to 1000 V
(1 V)

Accuracy guarantee

frequency range *

15 Hz ≤ f < 45 Hz ±1.5% rdg.

45 Hz ≤ f ≤ 66 Hz ±0.9% rdg.

66 Hz < f ≤ 1 kHz ±1.5% rdg.

15 Hz ≤ f < 45 Hz ±1.5% rdg.

45 Hz ≤ f ≤ 66 Hz ±0.9% rdg.

66 Hz < f ≤ 1 kHz ±1.5% rdg.

15 Hz ≤ f < 45 Hz ±1.5% rdg.

45 Hz ≤ f ≤ 66 Hz ±0.9% rdg.

66 Hz < f ≤ 1 kHz ±1.5% rdg.

Measurement accuracy

1 *2

Filter OFF Filter ON

±0.05 V

±0.03 V

±0.05 V

±0.5 V

±0.3 V

±0.5 V

±5 V

±3 V

±5 V

±2.0% rdg.
±0.05 V
±1.4% rdg.
±0.03 V

–

±2.0% rdg.
±0.5 V
±1.4% rdg.
±0.3 V

–

±2.0% rdg.
±5 V
±1.4% rdg.
±3 V

–

Input

impedance *

±5%

3.1 M

Ω

±5%

3.0 M

Ω

±5%

3.0 M

Ω

3

47

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Accuracy Table

PEAK MAX/PEAK MIN

Range

Accuracy guarantee range

(Resolution)

6.000 V 0 V to ±12.00 V (0.01 V) 15 Hz ≤ f < 45 Hz ±1.8% rdg.±0.07 V

60.00 V ±3.0 V to ±120.0 V (0.1 V) 15 Hz ≤ f < 45 Hz ±1.8% rdg.±0.7 V

3

600.0 V ±30 V to ±1000 V *

1000 V ±50 V to ±1000 V *

(1 V) 15 Hz ≤ f < 45 Hz ±1.8% rdg.±7 V

4

(1 V) 15 Hz ≤ f < 45 Hz ±1.8% rdg.±7 V

*1: Frequency range of 15 Hz ≤ f < 20 Hz is designed value.
*2: Within the frequency range of f < 45 Hz, the accuracy guarantee assumes a superposed DC voltage of

less than 500 V.

*3: Values of up to ±1200 V are displayed, but accuracy is not dened for display values in excess of 1000 V

(which are provided as reference values).

*4: Values of up to ±1700 V are displayed, but accuracy is not dened for display values in excess of 1000 V

(which are provided as reference values).

Accuracy guarantee

frequency range *

Measurement accuracy

1 *2

45 Hz ≤ f ≤ 66 Hz ±1.5% rdg.±0.07 V
66 Hz < f ≤ 1 kHz ±1.8% rdg.±0.07 V

45 Hz ≤ f ≤ 66 Hz ±1.5% rdg.±0.7 V
66 Hz < f ≤ 1 kHz ±1.8% rdg.±0.7 V

45 Hz ≤ f ≤ 66 Hz ±1.5% rdg.±7 V
66 Hz < f ≤ 1 kHz ±1.8% rdg.±7 V

45 Hz ≤ f ≤ 66 Hz ±1.5% rdg.±7 V
66 Hz < f ≤ 1 kHz ±1.8% rdg.±7 V

48

Accuracy Table

(9) DC voltage

Measurement value/MAX/MIN/AVE

Range (Auto-range threshold)

600.0 mV

(more than 6000 counts)

6.000 V (more than 6000 counts/

less than 540 counts)

60.00 V (more than 6000 counts/

less than 540 counts)

600.0 V (more than 6000 counts/

less than 540 counts)
1500 V (less than 540 counts) 0 V to ±1000 V *

*1: In the 1500 V range, the instrument can withstand input of up to 1000 V continuously or input in excess of

1000 V for no greater than 1 minute.

Accuracy guarantee range

(Resolution)

0.0 mV to ±600.0 mV
(0.1 mV)

0.000 V to ±6.000 V
(0.001 V)

0.00 V to ±60.00 V
(0.01 V)

0.0 V to ±600.0 V
(0.1 V)

(1 V)
±1001 V to ±1700 V *
(1 V)

1

1

Measurement

accuracy

±0.5% rdg.
±0.5 mV
±0.5% rdg.
±0.003 V
±0.5% rdg.
±0.03 V
±0.5% rdg.
±0.3 V
±0.5% rdg.
±3 V
±2.0% rdg.
±5 V

Input impedance (DC

input)

±5%

6.7 M

Ω

±5%

6.7 M

Ω

±5%

6.1 M

Ω

±5%

6.0 M

Ω

6.0 M

±5%

Ω

49

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Accuracy Table

PEAK MAX/PEAK MIN

Range Accuracy guarantee range (Resolution) Measurement accuracy

600.0 mV 0 mV to ±1200 mV (1 mV) ±1.0% rdg.±7 mV

6.000 V 0.00 V to ±12.00 V (0.01 V) ±1.0% rdg.±0.07 V

60.00 V 0.0 V to ±120.0 V (0.1 V) ±1.0% rdg.±0.7 V

600.0 V 0 V to ±1000 V (1 V) ±1.0% rdg.±7 V

1500 V 0 V to ±1000 V (1 V) ±1.0% rdg.±7 V

±1001 V to ±1200 V (1 V) ±5.0% rdg.±7 V

±1001 V to ±1700 V (1 V) ±5.0% rdg.±7 V

50

(10) AC+DC voltage

Measurement value/MAX/MIN/AVE

Range

(Auto-range

threshold)

6.000 V (more

than 6000
counts)

60.00 V

(more than
6000 counts/
less than 540
counts)

Accuracy

guarantee range

(Resolution)

0.000 V to 0.299 V
(0.001 V)

0.300 V to 6.000 V
(0.001 V)

3.00 V to 60.00 V

0.01 V)

Accuracy guarantee

frequency range *

10 Hz ≤ f < 45 Hz ±1.5% rdg.

DC,
45 Hz ≤ f ≤ 66 Hz
66 Hz < f ≤ 1 kHz ±1.5% rdg.

10 Hz ≤ f < 45 Hz ±1.5% rdg.

DC,
45 Hz ≤ f ≤ 66 Hz
66 Hz < f ≤ 1 kHz ±1.5% rdg.

10 Hz ≤ f < 45 Hz ±1.5% rdg.

DC,
45 Hz ≤ f ≤ 66 Hz
66 Hz < f ≤ 1 kHz ±1.5% rdg.

Measurement accuracy

1

Filter OFF Filter ON

±0.023 V
±1.0% rdg.
±0.023 V

±0.023 V

±0.013 V
±1.0% rdg.
±0.013 V

±0.013 V

±0.13 V
±1.0% rdg.
±0.13 V

±0.13 V

±2.0% rdg.
±0.023 V
±1.5% rdg.
±0.023 V

–

±2.0% rdg.
±0.013 V
±1.5% rdg.
±0.013 V

–

±2.0% rdg.
±0.13 V
±1.5 %rdg.
±0.13 V

–

Accuracy Table

Input

Ω
Ω

Ω
Ω

Ω
Ω

2

±5%
±5%

±5%
±5%

±5%
±5%

impedance *

DC: 6.7 M
AC: 3.2 M

DC: 6.7 M
AC: 3.2 M

DC: 6.1 M
AC: 3.1 M

51

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Accuracy Table

Range

(Auto-range

threshold)

600.0 V

(more than
6000 counts/
less than 540
counts)

1000 V
(less than 540
counts)

*1: Frequency range of 10 Hz ≤ f < 20 Hz is designed value.
*2: At DC input, 50 Hz AC input.

Accuracy

guarantee range

(Resolution)

30.0 V to 600.0 V
(0.1 V)

50 V to 1000 V
(1 V)

Accuracy guarantee

frequency range *

10 Hz ≤ f < 45 Hz ±1.5% rdg.

DC,
45 Hz ≤ f ≤ 66 Hz
66 Hz < f ≤ 1 kHz ±1.5% rdg.

10 Hz ≤ f < 45 Hz ±1.5 %rdg.

DC,45 Hz ≤ f ≤ 66 Hz ±1.0 %rdg.

66 Hz < f ≤ 1 kHz ±1.5 %rdg.

52

Measurement accuracy

1

Filter OFF Filter ON

±0.7 V
±1.0% rdg.
±0.7 V

±0.7 V

±7 V

±7 V

±7 V

±2.0% rdg.
±0.7 V
±1.5% rdg.
±0.7 V

–

±2.0 %rdg.
±7 V
±1.5 %rdg.
±7 V

–

Input

impedance *

DC: 6.0 M
AC: 3.0 M

DC: 6.0 M
AC: 3.0 M

Ω
Ω

Ω
Ω

2

±5%
±5%

±5%
±5%

Accuracy Table

PEAK MAX/PEAK MIN

Range

6.000 V 0.00 V to ±12.00 V

60.00 V ±3.0 V to ±120.0 V

600.0 V ±30 V to ±1000 V *

1000 V ±50 V to ±1000 V *

*1: Frequency range of 10 Hz ≤ f < 20 Hz is designed value.
*2: Values of up to ±1200 V are displayed, but accuracy is not dened for display values in excess of 1000 V

(which are provided as reference values).

*3: Values of up to ±1700 V are displayed, but accuracy is not dened for display values in excess of 1000 V

(which are provided as reference values).

Accuracy guarantee range

(Resolution)

(0.01 V)

(0.1 V)

2

(1 V)

(1 V)

3

Accuracy guarantee

frequency range *

10 Hz ≤ f < 45 Hz ±1.5% rdg.±0.07 V
DC, 45 Hz ≤ f ≤ 66 Hz ±1.0% rdg.±0.07 V
66 Hz < f ≤ 1 kHz ±1.5% rdg.±0.07 V
10 Hz ≤ f < 45 Hz ±1.5% rdg.±0.7 V
DC, 45 Hz ≤ f ≤ 66 Hz ±1.0% rdg.±0.7 V
66 Hz < f ≤ 1 kHz ±1.5% rdg.±0.7 V
10 Hz ≤ f < 45 Hz ±1.5% rdg.±7 V
DC, 45 Hz ≤ f ≤ 66 Hz ±1.0% rdg.±7 V
66 Hz < f ≤ 1 kHz ±1.5% rdg.±7 V
10 Hz ≤ f < 45 Hz ±1.5% rdg.±7 V
DC, 45 Hz ≤ f ≤ 66 Hz ±1.0% rdg.±7 V
66 Hz < f ≤ 1 kHz ±1.5% rdg.±7 V

Measurement accuracy

1

53

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Accuracy Table

(11) Continuity check

Range Accuracy guarantee range (Resolution) Measurement current Measurement accuracy

600.0

0.0 Ω to 600.0 Ω (0.1 Ω) 200 µA±20% ±0.7% rdg.±0.5

Ω

Ω

(12) Resistance

Range (Auto-range threshold)

600.0

Ω

(more than 6000 counts)

6.000 k

Ω

(more than 6000 counts/less than 540 counts)

60.00 k

Ω

(more than 6000 counts/less than 540 counts)

600.0 k

Ω

(less than 540 counts)

Accuracy guarantee

range (Resolution)

0.0

to 600.0 Ω

Ω

)

(0.1

Ω

0.000 k

to 6.000 kΩ

Ω

(0.001 k

0.00 k
(0.01 k

0.0 k
(0.1 k

)

Ω

to 60.00 kΩ

Ω

)

Ω

to 600.0 kΩ

Ω

)

Ω

Measurement

current

200 µA±20% ±0.7% rdg.

100 µA±20% ±0.7% rdg.

10 µA±20% ±0.7% rdg.

1 µA±20% ±0.7% rdg.

Measurement

accuracy

±0.5

Ω

±0.005 k

Ω

±0.05 k

Ω

±0.5 k

Ω

(13) Diode

Range Accuracy guarantee range (Resolution) Short-circuit current Measurement accuracy

1.800 V 0.000 V to 1.800 V *

*1: Beeping buzzer tone at forward connection (0.15 V to 1.8 V). Continuous buzzer tone and red backlight

lights up if less than 0.15 V.

1

(0.001 V) 200 µA±20% ±0.7% rdg.±0.005 V

54

(14) Capacitance

Range (Auto-range threshold)

1.000 µF

(more than 1100 counts)

10.00 µF

(more than 1100 counts/less than
100 counts)

100.0 µF

(more than 1100 counts/less than
100 counts)
1000 µF
(less than 100 counts)

Accuracy guarantee range

(Resolution)

0.000 µF to 1.100 µF
(0.001 µF)

0.00 µF to 11.00 µF
(0.01 µF)

0.0 µF to 110.0 µF
(0.1 µF)

0 µF to 1100 µF
(1 µF)

Discharge current

10 nA±20%
100 nA±20%
1 µA±20%
100 nA±20%
1 µA±20%
10 µA±20%
1 µA±20%
10 µA±20%
100 µA±20%
10 µA±20%
100 µA±20%
200 µA±20%

Accuracy Table

Measurement

accuracy

±1.9% rdg.
±0.005 µF

±1.9% rdg.
±0.05 µF

±1.9% rdg.
±0.5 µF

±1.9% rdg.
±5 µF

1

2

3

4

(15) Temperature (Thermocouples (K))

Range Accuracy guarantee range (Resolution) Measurement accuracy *

°C

2

°F *

*1: Conditions (In an environment where the temperature of the instrument is ±1°C and stable)
*2: Instrument can be made to display readings in Fahrenheit (°F) by means of special operation.

40.0°C to 400.0°C (0.1°C) ±0.5% rdg.±3.0°C



40.0°F to 752.0°F (0.1°F) ±0.5% rdg.±5.4°F



1

55

5

6

索
引

Accuracy Table

(16) DC power

Voltage range *1

(Input voltage range)

600.0 mV (0.0 mV to ±600.0 mV) 0.000 kVA to ±0.600 kVA (0.001 kVA) ±2.0% rdg.±0.020 kVA

6.000 V (±0.540 V to ±6.000 V) 0.00 kVA to ±6.00 kVA (0.01 kVA) ±2.0% rdg.±0.20 kVA

60.00 V (±5.40 V to ±60.00 V) 0.0 kVA to ±60.0 kVA (0.1 kVA) ±2.0% rdg.±2.0 kVA

600.0 V (±54.0 V to ±600.0 V) 0 kVA to ±600 kVA (1 kVA) ±2.0% rdg.±20 kVA

1500 V (±540 V to ±1000 V) 0 kVA to ±1000 kVA (1 kVA) ±2.0% rdg.±20 kVA
1500 V (±1001 V to ±1700 V) 0 kVA to ±1700 kVA (1 kVA) ±4.0% rdg.±20 kVA

*1: The DC power range is selected automatically based on the voltage range.

Accuracy guarantee range (Resolution) Measurement accuracy

56

4

Repairs, Inspections, and Cleaning

4.1 Troubleshooting

Symptom Verication and/or Solution

• The instrument is indicating an
abnormal measured value.

• Is the measured current value too small for the instrument’s
measurement range?

• Wrap the wire around the jaw one or more times. Each additional
wrap of the wire will increase the measured value, so that wrapping
it once yields a measured value that is twice the actual value and
wrapping it twice yields a measured value that is three times the
actual value.

• Is the tip of the jaw open?

• Is the jaw damaged?

• If the jaw is damaged or cracked, it will not be able to measure current
accurately. Send the instrument for repair.

• Displayed values can frequently uctuate due to induction potential
even when no voltage is applied. This, however, is not a malfunction.

57

1

2

3

4

5

6

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引

Troubleshooting

Symptom Verication and/or Solution

• 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 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.

58

• 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 eld from a source such as a nearby

transformer or high-current circuit or in the presence of a strong

electric eld from a source such as a wireless device.

• The jaw may emit sound 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. 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.

4.2 Error display

Error display

Error display Description Solution

Err 001

Err 002

Err 005

Err 008

ROM error

Program

ROM error

Adjustment data

ADC error

Hardware malfunction

Bluetooth error

Hardware malfunction
(only for model CM4376)

When the error appears in the display,
it is necessary to repair the instrument.
Please contact your authorized Hioki
distributor or reseller.

59

1

2

3

4

5

6

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Insert/Replace Batteries

4.3 Insert/Replace Batteries

WARNING

• To avoid electric shock, turn off the instrument and disconnect the test leads
before installing or replacing the batteries.

• Handle and dispose of batteries in accordance with local regulations.

• To prevent instrument damage or an electric shock, use only the screw that
are originally installed for securing the battery cover in place. If you have

lost a screw or nd that a screw is damaged, please contact your authorized

Hioki distributor or reseller.

The indicator lights up when the battery charge diminishes. Replace the batteries as
soon as possible. The batteries may die if the backlight turns on or the buzzer sounds. After

use, be sure to turn off the instrument.

60

Cleaning

Screw used to adjust
measured values ×3
(Do not adjust)

4

1
5

Do not adjust any screws other than the screw holding the battery cover in place. Do not adjust
the three screws underneath the cover, which are used to adjust measured values, as doing so
may prevent accurate measurement.

2

3

1

2

3

4

4.4 Cleaning

To clean the instrument, wipe it gently with a soft cloth moistened with water or mild detergent.

61

5

6

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引

Insert/Replace Batteries

62

Index

A

AC current ............................................ 17, 42

AC+DC current ..................................... 17, 44

AC+DC voltage ..................................... 17, 51

AC voltage ............................................ 17, 46

Auto hold .............................................. 15, 16

Auto Power Save (APS) ....................... 30, 31

AVG (average) value .................................. 19

B

Backlight ......................................... 30, 31, 60

Bluetooth ........................................ 11, 25, 59

Breaking (Disconnection) ....... 2, 8, 13, 23, 58

Buzzer sound.................................. 21, 31, 14

C

Capacitance.......................................... 23, 55

Continuity.................................. 17, 22, 54, 58

Current............................................ 14, 29, 35

D

DC current ...................................... 17, 24, 43

DC power.............................................. 24, 56

DC voltage ................................ 17, 24, 31, 49

Diode .............................................. 17, 22, 54

Disconnection (Breaking) ....... 2, 8, 13, 23, 58

DT4910 Thermocouples (K) ................... 5, 23

F

Filter ............................................................ 18

Fluctuate ..................................................... 57

Frequency....................................... 19, 21, 14

G

GENNECT Cross .................................. 25, 26

I

INRUSH ................................................ 20, 45

63

1

2

3

4

5

6

Index

Index

J

Jaw ......................................................... 7, 12

M

Manual hold ................................................ 15

MAX value .................................................. 19

Measurement function .................... 11, 17, 21

MIN value ................................................... 19

Mobile device........................................ 11, 25

N

Noise .......................................................... 18

P

PEAK value ................................................ 19

Polarity detection function .............. 14, 21, 31

R

Red display ........................................... 14, 22

Red ash .................................................... 21

Resistance ...................................... 17, 22, 54

Rush current ......................................... 20, 45

64

S

Serial number ....................................... 12, 31

T

Temperature ......................................... 23, 55

Test lead ............................................. 5, 8, 58

V

Voltage............................................ 21, 29, 37

Z

Zero adjustment.............................. 20, 22, 14