Hioki CM4371 User manual

AC/DC CLAMP METER

Instruction Manual

June 2016 Revised edition 2

CM4371A961-02 16-06H

CM4371

CM4372

CM4373

CM4374

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CM4371A961-02

Contents

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

Options (sold separately)..........................................................................................3

Safety Notes ...............................................................................................................4

Usage Notes ...............................................................................................................8

Part Names ...............................................................................................................11

Insert/Replace Batteries..........................................................................................12

Inspection Before Measurement.............................................................................14

Current Measurement..............................................................................................15

Manual Hold / Auto Hold..........................................................................................16

Switching ranges .....................................................................................................19

Filter Function..........................................................................................................20

MAX/MIN/AVG/PEAK................................................................................................21

Simultaneous display of DC current/voltage peak values...................................22

Backlight / Auto Power Save (APS)........................................................................23

Rush current (INRUSH)............................................................................................24

Contents

Other Measurement Functions...............................................................................25

Voltage.............................................................................................................25

Continuity Check ............................................................................................26

Resistance.......................................................................................................26

Diode................................................................................................................26

Capacitance.....................................................................................................27

Temperature ....................................................................................................27

Electric Charge Detection..............................................................................28

Simultaneous display of DC current and DC voltage..................................28

DC power.........................................................................................................28

Bluetooth®Communications (only for CM4372, CM4374)....................................29

Power-on Option Table............................................................................................34

Repairs, Inspections, and Cleaning .......................................................................36

Speciﬁcations...........................................................................................................39

Accuracy Table.........................................................................................................45

Introduction

Thank you for purchasing the Hioki CM4371, CM4372, CM4373, CM4374 AC/DC

Clamp Meter. To obtain maximum performance from the instrument, please read this

manual rst, and keep it handy for future reference.

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, voltage detection, and DC power measurement.

The CM4372 and CM4374 also provide Bluetooth communications functionality,

allowing measurement data to be monitored and logged from a smartphone or tablet.

Introduction

Package contents

AC/DC Clamp Meter L9207-10 Test lead

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

C0203 Carrying Case

LR03 Alkaline battery × 2

Instruction Manual*

Precautions Concerning Use of

Equipment That Emits Radio Waves

(only for CM4372, CM4374)

* Instruction manuals may also be available in other languages. Please visit our website at http://www.hioki.com

Registered trademark

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

CORPORATION under license.

•AndroidTM and Google PlayTM are registered trademarks of Google, Inc.

•IOS is a registered trademark of Cisco in the U.S. and other countries.

•iPhone®, iPad®, iPad miniTM, iPad ProTM, and iPod Touch®are registered trademarks of Apple Inc.

•The App Store is a service mark ofApple Inc.

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

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

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

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

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

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

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

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

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

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

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

L4933 Contact Pin Set *6

L4934 Small Alligator Clip Set *5

L4935 Alligator Clip Set *2

9243 Grabber Clip *3

L4936 Bus Bar Clip Set *4

L4937 Magnetic Adapter Set *3

L4932 Test Pin Set *1

L9207-10 Test lead *1

L4930 Connection Cable Set *2

(Length: 1.2 m)

L4931 Extension Cable Set *2

(Length: 1.5 m, with the

coupling connector)

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

DT4910 Thermocouples (K)

L4938 Test Pin Set *7

L4939 Breaker Pin Set *4

*1: CAT IV 600 V/ CAT III 1000 V/ CAT II 1000 V *4: CAT III 600 V

*2: CAT IV 600 V/ CAT III 1000 V *5: CAT III 300 V/ CAT II 600 V

*3: CAT III 1000 V *6: 33 V AC/ 70 V DC

*7: CAT III 600 V/ CAT II 600 V

Safety Notes

This instrument is designed to conform to IEC 61010 Safety Standards, and has been

thoroughly tested for safety prior to shipment. However, using the instrument in a way not

described in this manual may negate the provided safety features.

Before using the instrument, be certain to carefully read the following safety notes.

DANGER

Mishandling during use could result in injury or death, as well as damage to the

instrument. Be certain that you understand the instructions and precautions in

the manual before use.

WARNING

With regard to the electricity supply, there are risks of electric shock, heat

generation, re, and arc ash due to short circuits. If persons unfamiliar with

electricity measuring instruments are to use the instrument, another person

familiar with such instruments must supervise operations.

Safety Notes

WARNING

Protective gear

This instrument is measured on a live line. To prevent electric shock, use

insulated protective wear such as rubber gloves and rubber boots designed for

electrical work as well as a safety helmet as required by occupational health

and safety regulations.

Notation

In this document, the risk seriousness and the hazard levels are classied as follows.

DANGER Indicates an imminently

hazardous situation that will

result in death or serious injury

to the operator.

IMPORTANT

Indicates information related to

the operation of the instrument

or maintenance tasks with

which the operators must be

fully familiar.

WARNING Indicates a potentially hazardous

situation that may result in death

or serious injury to the operator. Indicates prohibited actions.

CAUTION

Indicates a potentially hazardous

situation that may result in

minor or moderate injury to

the operator or damage to the

instrument or malfunction.

Indicates the action which

must be performed.

Safety Notes

Symbols afxed to the instrument

Indicates cautions and hazards.

When the symbol is printed on the

instrument, refer to a corresponding

topic in the Instruction Manual.

Indicates DC (Direct Current) or AC

(Alternating Current).

Indicates that dangerous voltage may

be present at this terminal. Indicates DC (Direct Current).

Indicates that the instrument may be

connected to or disconnected from a

live conductor. Indicates a grounding terminal.

Indicates a instrument that has been

protected throughout by double

insulation or reinforced insulation.

Indicates the Waste Electrical and

Electronic Equipment Directive (WEEE

Directive) in EU member states.

Indicates that the product incorporates

Bluetooth®wireless technology. Indicates that the product conforms to

regulations set out by the EC Directive.

Safety Notes

Measurement categories

This instrument conforms to the safety requirements for CAT III 1000 V, CAT IV 600 V

measuring instruments.

T Outlet

Internal wiring

Distribution panel

Service entrance

Service drop

CAT IV

(≤600 V)

Power meter

CAT III

(≤1000 V)

Fixed installation

CAT II

(≤1000 V)

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