Omega HHM21 User Manual

OMEGA

HHM21

Digital Multimeter

OMEGAnetSM On-Line Service

http://www.omega.com

Internet e-mail

[e-mail]

Servicing North America:

USA: ISO 9001 Certified Canada:

One Omega Drive, Box 4047 976 Bergar

Stamford, CT 06907-0047 Laval (Quebec) H7L5A1

Tel: [phone] Tel: [phone]

FAX: [phone] FAX: [phone]

e-mail: [e-mail] e-mail: [e-mail]

omega.com

TM

For immediate technical or application assistance:

USA and Canada: Mexico and Latin America:

Sales Service: 1-800-826-6342 / 1-800-TC-OMEGA

SM

Tel: (95) 800-TC-OMEGA

SM

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

SM

FAX: [phone]

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

SM

En Español: [phone]

TELEX: 996404 EASYLINK: 62968934 CABLE: OMEGA e-mail: [e-mail]

Servicing Europe:

Benelux: Germany/Austria:

Postbus 8034, 1180 LA Amstelveen, Daimlerstrasse 26, D-75392

The Netherlands Deckenpfronn, Germany

Tel: [phone] FAX: [phone] Tel: [phone] FAX: [phone]

Toll Free in Benelux: 06 0993344 Toll Free in Germany: 0800 82 66342

e-mail: [e-mail] e-mail: [e-mail]

Czech Republic: United Kingdom: ISO 9002 Certified

ul. Rude armady 1868, 733 01 Karvina- One Omega Drive

Hranice, Czech Repubic Riverbend Technology Centre Northbank, Irlam,

Tel: [phone] FAX: [phone] Manchester, M44 5EX, England

e-mail: [e-mail] Tel: [phone] FAX: [phone]

France:

9, rue Denis Papin, 78190 Trappes Toll Free in England: 0800-488-488

Tel: [phone] FAX: [phone] e-mail: [e-mail]

Toll Free in France: 0800-4-06342

e-mail: [e-mail]

It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly pursuing cer tification
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 Engineering, Inc. 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, patient connected application.

1

SAFETY INFORMATION

The following safety information must be observed to insure maximum

personal safety during the operation at this meter:

1. Do not use the meter if the meter or test leads look damaged, or if you
suspect that the meter is not operating properly.

2. This meter is not recommended for high voltage industrial use; for example,
not for measurements of 440 VAC or 600 VAC industrial power mains. The
unit is intended for use with low energy circuits to 600VDC or AC or high
energy circuit to 250 VAC or DC. Accidental misuse by connection across
a high voltage, high energy power source when the meter is set up for mA
measurement may be very hazardous.

3. Turn off power to the circuit under test before cutting, unsoldering, or
breaking the circuit. Small amounts of current can be dangerous.

4. Use caution when working above 60V dc or 30V ac rms. Such voltages pose
a shock hazard.

5. When Using the probes, keep your fingers behind the finger guards on the
probes.

6. Measuring voltage which exceeds the limits of the multimeter may damage
the meter and expose the operator to a shock hazard. Always recognize the
meter voltage limits as stated on the front of the meter.

7. If the equipment is used in a manner not specified by the manufacturer, the
protection provided the equipment may be impaired.

2

SPECIFICATIONS

Display: Liquid crystal display (LCD) with a maximum reading of 4300.
Polarity: Automatic, positive implied, negative polarity indication.
Overrange: "1 OL"or "-1 OL" is displayed.
Low battery indication: the " " is displayed when the battery voltage drops

below the operating level.

Measurement rate: 2.5 times per second, nominal.
Operating Environment: 0°C to 40°C at < 70% relative humidity.
Storage Temperature: -20°C to 60°C, 0 to 80% R.H. with battery removed

from meter.

Accuracy: Stated accuracy at 23°C ± 5°C, <75% relative humidity.
Safety: According to EN61010-1 protection class II overvoltage category

(CAT II 600V) pollution degree 2.

Auto Power off: 30minutes after rotary switch and push button no changes.

(except MAX/MIN function)

Power: single standard 9-volt battery.
Battery life: 200 hours typical.
Dimensions: 192mm (H) x 91mm (W) x 52.5mm (D).
Weight: 365g including battery.
Accessories: One pair test leads, One spare fuse installed, 9V battery and

Operating Instructions.

3

DC VOLTS

Ranges: 430mV,4.3V,43V, 430V,600V
Resolution: 100µV
Accuracy: ±(0.25%rdg + 1dgt)
Input impedance: >10MW
Overload protection: 600VDC or AC rms

AC VOLTS (50Hz - 2KHz)

Ranges: 430mV,4.3V,43V,430V,600V
Resolution: 100µV
Accuracy:

Input impedance: >10MW
Overload protection: 600VDC or AC rms

Range 50Hz-100Hz 100Hz-500Hz 500Hz-2KHz
430mV ±(1.5%rdg+3dgts) N/A

4.3V N/A
43V
430V

600V

±(1.5%rdg+3dgts)

±(0.75%rdg+2dgts)

4

DC CURRENT

Ranges: 430µA,43mA,430mA,10A
Resolution: 100nA
Accuracy: ±(0.5%rdg + 1dgt) on µA,mA ranges

±(2.0%rdg + 1dgt) on 10A range

Burden voltage: 1.4V on all ranges, execpt

1.5V on 10A range

Input protection:0.5A / 250V fast blow ceramic fuse

10A / 600V fast blow ceramic fuse

AC CURRENT (50Hz - 1KHz)

Ranges: 430µA,43mA,430mA,10A
Resolution: 100nA
Accuracy: ±(1.0%rdg + 2dgts) on µA,mA ranges

±(2.5%rdg + 2dgts) on 10A range

Burden voltage: 1.4V on all ranges, execpt

1.5V on 10A range

Input protection:0.5A / 250V fast blow ceramic fuse

10A / 600V fast blow ceramic fuse

RESISTANCE

Ranges: 430W ,4.3KW ,43KW,430KW,4300KW,43MW
Resolution: 100mW
Accuracy: ±(0.3%rdg + 3dgts) on 430W range

±(0.3%rdg + 2dgts) on 4.3KW to 4300KW ranges
±(1.5%rdg + 4dgts) on 43MW range

Audible indication: <50W ±30W
Open circuit volts: 0.4Vdc
Overload protection: 500VDC or AC rms

5

CONTINUITY

Audible indication: <50W ±30W
Overload protection: 500VDC or AC rms

DIODE TEST

Accuracy: ±(3.0%rdg + 3dgts)
Resolution: 1mV
Test current: 1.0±0.6mA
Test voltage: <3.5V

TEMPERATURE

Ranges: -20°C to 1300°C

-4°F to -2372°F

Resolution: 1°C, 2°F
Accuracy: ±(2.0%rdg + 3dgts) on -20°C to 500°C

±(3.0%rdg + 2dgts) on 500°C to 1300°C
±(2.0%rdg + 6dgts) on -4°F to 932°F
±(3.0%rdg + 4dgts) on 932°F to 2372°F

6

OPERATION

Before taking any measurements, read the Safety Information Section.

Always examine the instrument for damage, contamination (excessive dirt,
grease, etc.) and defects. Examine the test leads for cracked or frayed
insulation. If any abnormal conditions exist do not attempt to make any
measurements.

RANGE Button

Press (RANGE) button to select the Manual Range mode and turn off the
"AUTO" annunciator.
In the Manual Range mode. each time you press (RANGE) button, the range
(and the input range annunciator) increments, and a new value is displayed.
To exit the Manual Range mode and return to autoranging, press and hold
down (RANGE) button for 2 seconds. The "AUTO" annunciator turns back on.

MAX/MIN Button

Press (MAX/MIN) to enter the MAX MIN AVG Recording mode (manual range
only). The RECORD annuciator turns on and the automatic power-off feature
is disabled.
Push (MAX/MIN) to cycle through the maximum(MAX), minimum(MIN),
average(AVG) and present readings. (AVG) is average last ten times reading
can be displayed. Press and hold down the (MAX/MIN) for 2 seconds to exit
and erase recorded reading.

7

A-H Button

In Auto hold mode, the meter will capture and hold the first stable non­zero(>100 digits) reading after a zero reading(<100 digits). Several consecu­tive measurements can be held and displayed without pressing the (A-H)
buttion. Simply by shorting the test leads together between measurements.
Press (A-H) to toggle in and out of the Auto Hold mode.
In the Auto Hold mode, the A-H annunciator is displayed.

REL

DD

DD

D Button

Press (REL

DD

DD

D) to enter the Relative mode, zero the display, and store the

displayed reading as a reference value. The relative mode annunciator(

DD

DD

D) is

displayed.
Press (REL

DD

DD

D) again to exit the relative mode.

DD

DD

DSET Button

The Relative value can also be changed by the user.
To set the Relative value ,press the (

DD

DD

DSET) to enter the

DD

DD

DSET mode, relative

value enter via yellow buttons (+/- 4300). Then press the (

DD

DD

DSET) button, store

the reference value.
Press (REL

DD

DD

D) to enter the Relative mode, then press (

DD

DD

DSET) to enter Relative

set value as a referance value.

8

TIME Button

Press (TIME) to enter elapsed-time mode.
Push (TIME) to cycle through the Minutes and seconds, hours and minuates.
Press and hold down the (TIME) for 2 seconds to exit TIME mode.

Voltage Measurements

1. Connect the red test lead to the "VW " jack and the black test lead to the
"COM" jack.

2. Set the Function/Range switch to the desired voltage function.

3. Connect the test leads to the device or circuit being measured.

4. For dc, a (-) sign is displayed for negative polarity; positive polarity is implied.

Current Measurements

1. Set the Function/Range switch to the desired current range and press the
A toggle button to select AC or DC.

2. For current measurements less than 430mA, connect the red test lead to the
µAmA jack and the black test lead to the COM jack.

3. For current measurements of 430mA or greater, connect the red test lead
to the 10A jack and the black test lead to the COM jack.

4. Remove power from the circuit under test and open the normal circuit path
where the measurement is to be taken. Connect the meter in series with the
circuit.

5. Use caution when measuring 10 amps on 10A range for 60s, please waiting
for 10 minutes for next measurement of 10 amps for safety reason.

9

Resistance and Continuity Measurements

1. Set the Function/Range switch to the resistance function.

2. Remove power from the equipment under test.

3. Connect the red test lead to the "VW" jack and the black test lead to the
"COM" jack.

4. Touch the probes to the test points. In ohms, the value indicated in the
display is the measured value of resistance.

5. The beeper sounds continuously, if the resistance is less than 50W±30W .

WARNING

The accuracy of the functions might be slightly affected, when exposed to
a radiated electromagnetic field environment, eg, radio, telephone or
similar.

Diode Tests

1. Connect the red test lead to the "VW" jack and the black test lead to the
"COM" jack.

2. Set the Function/Range switch to the "

" position.

3. Turn off power to the circuit under test.

4. Touch probes to the diode. A forward-voltage drop is about 0.6V (typical for
a silicon diode).

5. Reverse probes. If the diode is good, 1 OL is displayed. If the diode is
shorted, ".000" or another number is displayed.

6. If the diode is open, 1 OL is displayed, in both directions.

7. If the junction is measured in a circuit and a low reading is obtained with both
lead connections, the junction may be shunted by a resistance of less than
1kW. In this case the diode must be disconnected from the circuit for
accurate testing.

Temperature Measurements

1. Set the Function/Range switch to the " °F/°C " position.

2. Push the " °F/°C " key, select the desired °F/°C scale.

3.Connect a type k thermocouple to the jack on the instrument. Place the probe
or thermocouple tip on or in the material to be measured and take the
temperature reading directly from the display.

WARNING

Remove test leads being measured

10

11

MAINTENANCE

WARNING

Remove test leads before changing battery or fuse

or performing any servicing.

Battery Replacement

Power is supplied by a 9 volt "transistor" battery. (NEDA 1604, IEC 6F22). The
" " appears on the LCD display when replacement is needed. To replace the
battery, remove the two screws from the back of the meter and lift off the
battery case. Remove the battery from battery contacts.

Fuse Replacement

If no current measurements are possible, check for a blown overload protec­tion fuse. There are two fuses; F1 for the "mA" jack and F2 for the "10A" jack.
For access to fuses, remove the four screws from the back of the meter and
lift off the battery cover and case. Replace F1 only with the original type 0.5A/
250V, fast acting ceramic fuse. Replace F2 only with the original type 10A/
600V, fast acting ceramic fuse.

Cleaning

Periodically wipe the case with a damp cloth and detergent, do not use
abrasives or solvents.

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 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 cover age on each product.If
the unit should malfunction, 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 defectiv e it will be repaired or replaced at no charge. OMEGA's W ARRANTY does not apply to def ects 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 W ARRANTY is V OID if the unit shows evidence of ha ving been tampered with or shows evidence
of being 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 which wear are not warranted, including but 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 err or s 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 it
will be as specified and free of defects. OMEGA MAKES NO O THER WARRANTIES OR REPRESENT ATIONS 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.
LIMITA TION 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 b y 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 W ARRANTY / 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 ha ve the following

information available BEFORE contacting OMEGA:

1. P.O. 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. P.O. number to cover the COST of the repair.

2. Model and serial number of 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 1999 OMEGA ENGINEERING,
INC. All rights reserved. This document may not be copied, photocopied, reproduced, translated, or reduced to any electronic medium or
machine-readable from, in whole or in part, without prior written consent of OMEGA ENGINEERING, INC.

M-2847/0799

Where Do I Find Everything I Need for

Process Measurement and Control?

OMEGA...Of Course!

TEMPERATURE

þ Thermocouple, RTD & Thermistor

Probes, Connectors, Panels & Assemblies

þ Wire: Thermocouple, RTD & Thermistor

þ Calibrators & Ice Point References

þ Recorders, Controllers & Process Monitors

þ Infrared Pyrometers

PRESSURE/STRAIN AND FORCE

þ Transducers & Strain Gauges

þ Load Cells & Pressure Gauges

þ Displacement Transducers

þ Instrumentation & Accessories

FLOW/LEVEL

þ Rotameters, Gas Mass Flowmeters

& Flow Computers

þ Air Velocity Indicators

þ Turbine/Paddlewheel Systems

þ Totalizers & Batch Controllers

pH/CONDUCTIVITY

þ pH Electrodes, Testers & Accessories

þ Benchtop/Laboratory Meters

þ Controllers, Calibrators, Simulators

& Pumps

þ Industrial pH & Conductivity Equipment

DATA ACQUISITION

þ Data Acquisition &

Engineering Software

þ Communications-Based

Acquisition Systems

þ Plug-in Cards for Apple, IBM

& Compatibles

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HEATERS

þ Heating Cable

þ Cartridge & Strip Heaters

þ Immersion & Band Heaters

þ Flexible Heaters

þ Laboratory Heaters

ENVIRONMENTAL
MONITORING AND CONTROL

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þ Refractometers

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þ Air, Soil & Water Monitors

þ Industrial Water & Wastewater

Treatment

þ pH, Conductivity & Dissolved Oxygen

Instruments