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Safety precautions

Various symbols are used on the instrument and throughout this manual to 

ensure safe use of the product and to protect against possible hazards or 

damage.  The following safety symbols are used where appropriate.  Read 

the explanations carefully and familiarize yourself with the symbols before 

reading the text.

WARNING

  Indicates a hazard that may result in the loss of life or 

serious injury of the user unless the described instruction 

is abided by. 

CAUTION

  Indicates a hazard that may result in an injury to the 

user and/or physical damage to the product or other 

equipment unless the described instruction is abided 

by.

The  following  safety  symbols  are  used  on  the  instrument  and  in  this 

manual:

WARNING

  Danger! Handle with Care

 

This symbol indicates that the operator must refer to an explanation 

in the instruction manual in order to avoid the risk of injury or death 

of personnel or damage to the instrument.

  This symbol indicates that this instrument designed to be applied 

around or removed from HAZARDOUS LIVE conductors provided 

if the RATED circuit-to-earth voltage dose not exceed the value 

indicated in the measurement category.

  Double Insulation

 

This symbol indicates double insulation.

 

Alternating Current

 

This symbol indicates AC voltage/current.

 

Direct Current

 

This symbol indicates DC voltage/current.

   

Earth TERMINAL

 

This symbol indicates ground.

WARNING

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 Strictly observe the following cautionary notes in order to 

avoid the risk of injury or death of personnel or damage to 

the instrument due to hazards such as electrical shock.

•  Do not use the instrument if there is any damage to the casing, bat-

tery cover, display and labels or when the casing is removed.

•  Barrier is for to avoid touching the conductor. 

  Be careful not to across the Barrier when using the instrument.

•  Disconnect the instrument from the measurable conductors under 

test before opening the casing to replace the battery.

•  Safety protectors such as rubber-insulated gloves should be worn to 

prevent electrical shock when using the instrument.

•  Avoid using the instrument if it has been exposed to rain or moisture 

or if your hands are wet.

•  Do not use the instrument in an atmosphere where any flammable 

or explosive gas is present.

WARNING

Measurement Category of Model 30031A

Measurement 

category (CAT.) Maximum Allowable Input 

III

62 Arms

(The RATED circuit-to-earth voltage: 300 Vrms AC)

Do not apply input exceeding this value. Otherwise, 

it will not only damage the tester, but also pose a risk

of damage to the human body. For safety standards, 

refer to the specifications.

CAUTION

•  Do not use the instrument near noise-emitting equipment or where 

there may be sudden changes in temperature.  Otherwise, the instru-

ment may produce an unstable readings or errors.

•  Do not wipe the instrument using an organic solvent such as benzine 

or paint thinner.  Otherwise, the front panel may be damaged or 

discolored.  When cleaning the instrument, use a dry cloth.

•  Do not leave the tester exposed to direct sunlight or in a hot and 

humid location such as the inside of a car, for any prolonged length 

of time.

•  If the instrument will not be used for long periods, remove the bat-

tery.

User’s

Manual

Models 30031A
Leakage Clamp-on Tester

IM 30031A-E

2nd Edition: Aug. 2009 (KP)

Copyright May 2008 (YMI).  2nd Edition; Aug. 2009 (KP)

CAUTION

•  The jaw section is a delicate, precision sensor.  Do not subject the 

jaw to unreasonably strong shock, vibration, or force when using 

it.

•  If dust gets into the tops of the jaws, remove it immediately.  Do not 

close the jaws when dust is trapped in its joints as the sensor may 

break.

Components

1) Jaw Section

   Is a precision sensor for detecting currents.

2) Open/Close Lever

   Opens and closes the jaws.

3) Display

   Shows the measured value (digital reading or bar graph), unit, function 

and low-battery symbol  (

).

4) mA/A Selector Switch

   Selects the unit of AC current (either “mA” or “A”) to be measured.

5) Data Hold Switch

   Retains the measured data.  If you press this switch, the 

 symbol ap-

pears and the data is retained.  If you press this switch once again, data 

holding is canceled (the 

 symbol disappears).

6) Power Switch

   Turns on the power to the instrument.  

7) Battery Housing (Battery cover)

   Contains the battery.

8) Barrier

   Prevents contact with the wires.

Jaw

section

Open/

close lever

Battery

housing

(cover)

mA/A 

selector

switch

Power

switch

Data hold

switch

Display

Hand strap 

Barrier

Display (LCD)

AUTO POWER OFF Function

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 When the AUTO POWER OFF Function is Used

•  AUTO OFF appears.

•  The instrument automatically turns off 10 minutes after the last switch 

operation. A buzzer starts to beep 15 seconds before the automatic 

power-off.

•  Pressing any switch after the beep restarts the auto power-off func-

tion.

Store this manual in a safe 

place for future reference.

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 When the AUTO POWER OFF Function is not Used

  (Cancellation of the AUTO POWER OFF Function)

•  Turn off the power.

•  With the DATA HOLD switch held down, press the POWER switch 

for more than 2 sec. to turn on the power.

  This causes the buzzer to sound, canceling the AUTO POWER OFF 

function (the AUTO OFF display goes off).

  If the instrument is used with the AUTO POWER OFF function can-

celled, take care not to let the battery run down.

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 Recovering the AUTO POWER OFF Function

•  Turn off the power.

•  Turn on the power. This enables the AUTO POWER OFF function to 

recover.  (AUTO OFF appears.)

Measuring Instructions

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 Before measurement

Before measurement

a)  Examine the casing, battery cover, display, and labels of the instrument 

for abnormalities.

b)  Make sure that the battery cover is firmly closed.

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 AC Current Measurement (unit: mA/A)

a)  Press the POWER switch to turn on the power.

b)  Squeeze the open/close lever to open the jaws.  Insert a wire from the 

measurable conductors under test through the jaws, making sure the tops 

of the jaws are tightly shut.

c)  When the reading stabilizes, read the value.  If you have difficulties in 

reading the value, use the DATA HOLD function.

d)  When measuring Load Current, press the mA/A switch to change to A 

range.

e)  When you have finished measurement, press the POWER switch to turn 

off the tester.

CAUTION

•  The correct measured values are not displayed if the jaws do not fit 

precisely. Make sure that they are shut tightly.

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 Using the DATA HOLD switch

Pressing the DATA HOLD switch retains the measured data and displays 

. The mA/A selector switch cannot be used in this situation. The only 

switches that can be used are the DATA HOLD switch (to cancel data hold-

ing) and the POWER switch.

Range Selection

n

 Range Selection

Switching between the 3 mA and 30 mA ranges and between the 30 A and 

60 A ranges is performed by auto-ranging (automatic). For switching be-

tween the 3/30 mA and 30/60 A ranges, the range must be switched using 

the mA/A selector switch.

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 Measurement Ranges

3 mA range 

30 mA range 

30 A range 

60 A range 

0.000mA

0.010mA<I

I≤2.88mA 

I≥3.270mA 

I≥32.70mA 

Zero correction

Overrange

OL

I≤28.8A

I≥32.70A 

I≥60.6A 

62.0A MAX 

Range down

Overrange

Range up

Range down

Range up

OL

0.05A<I

Zero correction

0.00A

Battery Replacement

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 Battery �oltage

Battery �oltage

If the battery runs down and its voltage falls below the operating voltage 

(effective range), the 

  symbol appears in the LCD display; promptly 

replace the battery with a new one.

(Battery: CR2032, 1 pc.)

CAUTION

•  The specified accuracy is assured when the battery voltage is in the 

effective range.

  If the 

  symbol is displayed, promptly replace the battery.

•  If the power does not come on even after pressing the POWER 

switch, the battery voltage may have fallen too low. Replace the 

battery with a new one.

IM 30031A-E

 <1>

IM3E-2009.2

Yokogawa Meters & Instruments Corporation
International Sales Dept.

Tachihi Bld. No.2, 6-1-3, Sakaecho, Tachikawa-shi,Tokyo 190-8586 Japan

Phone: 81-42-534-1413, Facsimile: 81-42-534-1426

YOKOGAWA CORPORATION OF AMERICA (U.S.A.)

Phone: 1-800-888-6400  Facsimile: 1-770-254-0928

YOKOGAWA EUROPE B. V. (THE NETHERLANDS)

Euroweg 2, 3825 HD, Amersfoort, THE NETHERLANDS

Phone: 31-88-4641000  Facsimile: 31-88-4641111

YOKOGAWA AMERICA DO SUL LTDA. (BRAZIL)

Phone: 55-11-5681-2400  Facsimile: 55-11-5681-4434

YOKOGAWA ENGINEERING ASIA PTE. LTD. (SINGAPORE)

Phone: 65-6241-9933  Facsimile: 65-6241-2606

YOKOGAWA MEASURING INSTRUMENTS KOREA CORPORATION (KOREA)

Phone: 82-2-551-0660 to -0664  Facsimile: 82-2-551-0665

YOKOGAWA AUSTRALIA PTY. LTD. (AUSTRALIA)

Phone: 61-2-8870-1100  Facsimile: 61-2-8870-1111

YOKOGAWA INDIA LTD. (INDIA)

Phone: 91-80-4158-6000  Facsimile: 91-80-2852-1441

YOKOGAWA SHANGHAI TRADING CO., LTD. (CHINA)

Phone: 86-21-6239-6363  Facsimile: 86-21-6880-4987

YOKOGAWA MIDDLE EAST B. S. C (C) (BAHRAIN)

Phone: 973-17-358100  Facsimile: 973-17-336100

YOKOGAWA ELECTRIC CIS LTD. (RUSSIAN FEDERATION)

Phone: 7-495-737-7868  Facsimile: 7-495-737-7869

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