Omega HHM250 User guide

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User’s Guide

HHM250

AC Clamp Meter

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MADE IN TAIWAN

Servicing North America:

U.S.A.: Omega Engineering, Inc. One Omega Drive, P. O. Box 4047

ISO 9001 Certified Stamford CT 06907-0047 USA

Toll-Free: 1-800-826-6342 Tel: [phone]
FAX: [phone] e-mail: [email protected]

Canada: 976 Bergar

Laval (Quebec), Canada H7L 5A1
Toll-Free: 1-800-826-6342 TEL: [phone]
FAX: [phone] e-mail: [email protected]

For immediate technical or application assistance:

U.S.A. and Canada: Sales Service: 1-800-826-6342/1-800-TC-OMEGA

®

Customer Service: 1-800-622-2378/1-800-622-BEST

®

Engineering Service: 1-800-872-9436/1-800-USA-WHEN

®

Mexico: En Espan˜ol: 001 [phone] FAX: [phone]

[email protected] e-mail: [email protected]

Servicing Europe:

Benelux: Managed by the United Kingdom Office

Toll-Free: 0800 099 3344 TEL: [phone]
FAX: [phone] e-mail: [email protected]

Czech Republic: Frystatska 184

733 01 Karviná, Czech Republic
Toll-Free: 0800-1-66342 TEL: [phone]
FAX: [phone] e-mail: [email protected]

France: Managed by the United Kingdom Office

Toll-Free: 0800 466 342 TEL: [phone]
FAX: [phone] e-mail: [email protected]

Germany/Austria: Daimlerstrasse 26

D-75392 Deckenpfronn, Germany
Toll-Free: 0 800 6397678 TEL: [phone]
FAX: [phone] e-mail: [email protected]

United Kingdom: OMEGA Engineering Ltd.

ISO 9001 Certified One Omega Drive, River Bend Technology Centre, Northbank

Irlam, Manchester M44 5BD England
Toll-Free: 0800-488-488 TEL: [phone]
FAX: [phone] e-mail: [email protected]

OMEGAnet®Online Service Internet e-mail

omega.com [email protected]

It is the policy of OMEGA Engineering, Inc.to comply with all worldwide safety and EMC/EMI
regulations that apply. OMEGA is constantly pursuing certification of its products to the European
New Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.

The information contained in this document is believed to be correct, but OMEGA accepts no liability for any
errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, human applications.

TABLE OF CONTENTS

1.

SAFETY INFORMATION....................................................... 1

2.

GENERAL SPECIFICATION................................................. 1

3.

ELECTRICAL SPECIFICATION........................................... 2

3-1

DIRECT VOLTAGE..................................................................... 2

3-2

ALTERNATING VOLTAGE ........................................................... 2

3-3

ALTERNATING CURRENT ........................................................... 2

3-4

RESISTANCE(Ω)....................................................................... 3

3-5

CONTINUITY( )...................................................................... 3

3-6

FREQUENCY HZ ....................................................................... 3

4.

DESCRIPTION OF THE INSTRUMENT ............................. 4

4-1

DESCRIPTION OF THE DISPLAY ................................................... 4

4-2

DESCRIPTION OF FRONT AND REAR ............................................ 5

5.

BUTTON INSTRUCTION....................................................... 6

5-1

HOLD FUNCTION .................................................................... 6

5-2

INRUSH FUNCTION ................................................................ 6

5-3

BACKLIGHT FUNCTION .......................................................... 6

6.

MEASURING INSTRUCTION............................................... 6

6-1

AC VOLTAGE MEASUREMENT.................................................... 6

6-2

DC VOLTAGE MEASUREMENT ................................................... 7

6-3

AC CURRENT MEASUREMENT ................................................... 7

6-4

RESISTANCE MEASUREMENT..................................................... 8

6-5

CONTINUITY MEASUREMENT ..................................................... 8

6-6

MEASUREMENT OF THE VOLTAGE FREQUENCY........................... 9

6-7

MEASUREMENT OF THE CURRENT FREQUENCY .......................... 9

7.

BATTERY CHANGING .......................................................... 9

8.

MAINTENANCE..................................................................... 10

Clamp Meter

1. SAFETY INFORMATION

Do not operate the tester if the body of meter or the test lead look
broken.
Check the main function dial and make sure it is at the correct position
before each measurement.
Do not perform resistance and continuity test on a live power system.
Do not apply voltage between the test terminals and test terminal to
ground that exceed the maximum limit record in this manual.
Keep the fingers after the protection ring when measuring through the
test lead.
Chang the battery when the
data.

Environmental Conditions

Operation Temperature: 0°C to 40°C(32°F to 104°F); < 70 % RH
Storage Temperature: -10°C to 60°C(14°F to 140°F); < 80 % RH

Explanation Symbols

Attention refer to operation Instructions.

Dangerous voltage may be present at terminals.

This instrument has double insulation.

Approvals:

EN61010 600V CAT III

symbol appears to avoid incorrect

2. GENERAL SPECIFICATION

Digital Display:

4 digital liquid crystal(LCD), Maximum reading 6600.

Polarity:

When a negative signal is applied, the

Low Battery Indication:

When the battery is under the proper operation range,
on the LCD display.

Sample Rate:

3 times/sec for digital data.

signal appears.

will appear

1

Clamp Meter

Power Source:

1.5V size AAA battery X 2
Typical battery Life: 50 hours (without buzzer, backlight function)

Auto Power Off:

If there is no key or dial operation for 15 minutes, the meter will power
itself off to save battery consumption. This function can be disabled by

press and hold the “

” button then power the unit on.

Over Load:

When the signal larger than the maximum will be show

.

Maximum jaw opening:

∅ 25 mm

Dimensions:

210 x 62 x 36 mm

Weight:

273g (with battery)

Accessories:

Carrying case, Batteries, Test Lead & Instruction Manual.

3. ELECTRICAL SPECIFICATION

Accuracy is to within ± [% of the reading + number of counts (cts)] in
the reference conditions indicated in the appendix.

3-1 Direct Voltage

Range Resolution Accuracy

600 V 0.1 V

Input impedance: 1 MΩ

3-2 Alternating Voltage

Range Resolution Accuracy

600 V 0.1 V

Input impedance: 1 MΩ

3-3 Alternating Current

Range Resolution Accuracy

66 A 0.01 A

660 A 0.1 A

1% ± 2dgts

1.2% ± 5dgts

1.9% ± 5dgts

2

3-4 Resistance (Ω)

Range Resolution Accuracy

660 Ω 0,1 Ω

1% ± 2dgts

3-5 Continuity

Range Resolution Accuracy

Ohm function Buzzer<30

3-6 Frequency Hz

Input impedance: 100 kΩ

For current:

Range Resolution Accuracy Sensitivity
660Hz 0.1 Hz

6.6KHz 0.001KHz
30KHz 0.01KHz

0.2% ±1 dgt

For voltage:

Range Resolution Accuracy Sensitivity
660Hz 0.1 Hz

6.6KHz

66KHz

100KHz

0.001KHz

0.01KHz

0.1KHz

0.2% ±1 dgt

Clamp Meter

Ω

3 Arms

5 Vrms

3

Clamp Meter

4. DESCRIPTION OF THE INSTRUMENT

4-1 Description Of The Display

Auto power off indication

Polarity indication

Low battery indication

Alternative source indication

Direct source indication

Current measurement indication

Voltage measurement indication

Data hold indication

INRUSH Current Indication

Continuity test indication

Measurement unit

Resistance measurement indication

Frequency measurement indication

4

4-2 Description Of Front And Rear

1

Clamp Meter

2

4

5

7

I

3

6

10

98

61010600

1.5VX2

1

Current Sensing Clamp

○

2

Clamp opening handle

○

○3 Function select dial

4

Inrush button

○

5

Backlight button

○

6

Data hold button

○

7

LCD display

○

8

COM input terminal

○

9

Positive input termina

○

10

Battery cabinet

○

5

Clamp Meter

5. BUTTON INSTRUCTION

5-1 HOLD Function

It i

s possible to freeze the value displayed by pressing on the

OLD" button. To deactivate this function, press the "HOLD"

"H
button a s

5-2 INRUSH F

In ACA range, pre
INRU SH mode . Then LCD display “ - - - - until the motor starts

econd time.

unction

ss INRUSH button will force meter to enter

”
up and is detected (10A above). The detection will be done only
one tim e and the out put reading w ill be held. When done, p ress
IN

RUSH button could enter INRUSH mode again. To exit INRUSH

mode, pres

s INRUSH button more than one second. Enter INRUSH
mode in automatic ACA range will force the range be locked in
higher one.

-3 BAC

KLIGHT Function

5

“

If yo

u press on the

function.(The b

ll light for 1 minutes)

it wi

u press on the

If yo

acklight is blue light. When you turn on this function,

“

utton, i

”

b

t will turn on the backlight

button again, the function will be turned

”

off.

6. MEASURING INSTRUCTION

6-1 AC Voltage Measurement:

Swi

tch the main function selector

range.

to
Connect r

ed test lead to “ +
terminal and black one to the
“ C

OM terminal.

”
Measure the voltage by touching
the test lead tips to the test circuit
where the value of voltage is
needed.
Read the result from the LCD

anel.

p

”

ICATI

I

600V

6

Clamp Meter

6-2 DC Voltage Measurement:

Swi

tch the main function selector

to

range.

Connect r

ed test lead to “ + ”

terminal and black one to the

”

OM terminal.

“ C
Measure the voltage by touching
the test lead tips to the test circuit
where the value of voltage is
needed.

I

CATII
600V

Read the result from the LCD

anel.

p

AC Current Measurement:

6-3

tch the main function selector to

Swi

range.
Open the clamp by pressing the jaw-opening handle and insert the
cable to be measured into the jaw.
Close the clamp and get the reading from the LCD panel.

ote:

N

efore t

his measurement, disconnect the test lead with the meter

B

r safety.

fo
In some occasion that the reading is hard to read, push the HOLD

nd read the result later.

utton a

b

CORRECT

C

A

6

T

0

I

0

I
I

V

INCORRECT

I

ICATI

600V

7

Clamp Meter

6-4 Resistance Measurement

Swi

tch the main function to
Connect r
and b
Connect t
points wh
is n

ed test lead to “ + ” terminal

lack one to the “COM” terminal.

ip of the test leads to the

ere the value of the resistance

eeded.

range.

Read the result from the LCD panel.

ote:

N

hen taking resistance readings from a

W
circuit sys
cut o

tem, make sure the power is

ff and all capacitors need to be

discharged.

-5 Contin

6

uity Test With Buzzer:

Swi

tch the main function to
Connect r
“ COM ”

Connect t

ed test lead to

termi

nal.

ip of the test leads to the points where the conduction

range.

terminal and black one to the

“ + ”

condition needed.

he resistance is under 30Ω, the beeper will sound continuously.

f t

I

Beepe

Short circuit Open circuit

8

Clamp Meter

6-6 Measurement Of The Voltage Frequency

Swi

tch the main function to
Connect r
and b
Pla ce the p robes in cont act w ith the
poi nts wher e fre quency i s to be
measured.
Read the result on the LCD panel.

Measurement Of The Current Frequency

6-7

Swi
Open the clamp by pressing the trigger.
Encircle the conductor and close the
j
Read the result on the LCD panel.

ed test lead to “ + ” terminal

lack one to the “ COM ” terminal.

tch the main function to

correctly by releasing the trigger.

aws

range.

range.

7. BATTERY CHANGING

When the battery voltage drops below proper operation range the
symbol will appear on the LCD display and the battery needs to be

hanged.

c

efore changing the battery, switch t he mai n d ial to “ OFF ” and

B
disconnect t
Open t
Replace t
Close t

est leads.

he back cover by a screwdriver.

he old batteries with two new 1.5V (AAA Size) battery.

he back cover and fasten the screw.

9

Clamp Meter

8. MAINTENANCE

WARNING!

Before opening the meter, disconnect both test lead and never use

e meter before the cover is closed.

th

CAUTION!

T

o avoid contamination or static damage, do not touch the circuit

bo

ard without proper static protection.

8-

1 REMARK:

If the meter is not going to be used for a long time, take out the

battery and do not store the meter in high temperature or high
humidity environment.

When taking current measurement, keep the cable at the center of

the clamp to get more a ccurate test result.

Repairs or servicing not covered in this manual should be performed

only by qualified personal.

8-

2 CLEANING:

Periodicall
so

y wipe the case with a dry cloth. Do not use abrasives or

lvents on these instruments.

10

Clamp Meter

NOTES:

11

WARRANTY/DISCLAIMER

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and
workmanship for a period of 13 months from date of purchase. OMEGA’s WARRANTY adds an
additional one (1) month grace period to the normal one (1) year product warranty to cover
handling and shipping time. This ensures that OMEGA’s customers receive maximum
coverage on each product.

If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer
Service Department will issue an Authorized Return (AR) number immediately upon phone or
written request. Upon examination by OMEGA, if the unit is found to be defective, it will be
repaired or replaced at no charge. OMEGA’s WARRANTY does not apply to defects resulting
from any action of the purchaser, including but not limited to mishandling, improper interfacing,
operation outside of design limits, improper repair, or unauthorized modification. This
WARRANTY is VOID if the unit shows evidence of having been tampered with or shows evidence
of having been damaged as a result of excessive corrosion; or current, heat, moisture or vibra­tion; improper specification; misapplication; misuse or other operating conditions outside of
OMEGA’s control. Components in which wear is not warranted, include but are not limited to
contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products. However,
OMEGA neither assumes responsibility for any omissions or errors nor assumes liability
for any damages that result from the use of its products in accordance with information
provided by OMEGA, either verbal or written. OMEGA warrants only that the parts
manufactured by the company will be as specified and free of defects. OMEGA MAKES
NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER,
EXPRESSED OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES
INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The remedies of pur­chaser set forth herein are exclusive, and the total liability of OMEGA with respect to this
order, whether based on contract, warranty, negligence, indemnification, strict liability or
otherwise, shall not exceed the purchase price of the component upon which liability is
based. In no event shall OMEGA be liable for consequential, incidental or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as
a “Basic Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity;
or (2) in medical applications or used on humans. Should any Product(s) be used in or with any
nuclear installation or activity, medical application, used on humans, or misused in any way,
OMEGA assumes no responsibility as set forth in our basic WARRANTY/ DISCLAIMER language,
and, additionally, purchaser will indemnify OMEGA and hold OMEGA harmless from any liability
or damage whatsoever arising out of the use of the Product(s) in such a manner.

RETURN REQUESTS/INQUIRIES

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department.
BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN
AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT
(IN ORDER TO AVOID PROCESSING DELAYS). The assigned AR number should then be
marked on the outside of the return package and on any correspondence.

The purchaser is responsible for shipping charges, freight, insurance and proper packaging to
prevent breakage in transit.

FOR WARRANTY

RETURNS, please have
the following information available BEFORE
contacting OMEGA:

1. Purchase Order number under which

the product was PURCHASED,

2. Model and serial number of the product

under warranty, and

3. Repair instructions and/or specific

problems relative to the product.

FOR NON-WARRANTY REPAIRS,

consult
OMEGA for current repair charges. Have the
following information available BEFORE
contacting OMEGA:

1. Purchase Order number to cover the

COST of the repair,

2. Model and serial number of the

product, and

3. Repair instructions and/or specific problems

relative to the product.

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible.
This affords our customers the latest in technology and engineering.

OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 2008 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied,

reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without
the prior written consent of OMEGA ENGINEERING, INC.

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OMEGA…Of Course!

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