Omega HHM26 User manual

OMEGA
HHM26
Digital Multimeter

OMEGAnetSM On-Line Service
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It is the policy of OMEGA 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 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.Thismeterisnotrecommendedforhighvoltageindustrialuse;forexample,
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.Usecautionwhenworkingabove60Vdcor30Vacrms.Suchvoltagespose
a shock hazard.
5. When Using the probes, keep your fingers behind the finger guards on the
probes.
6.Measuring voltagewhichexceedsthelimitsofthemultimetermaydamage
themeterandexposetheoperatortoashockhazard.Alwaysrecognizethe
meter voltage limits as stated on the front of the meter.
7.Ifthe equipmentisused inamanner notspecifiedby themanufacturer,the
protection provided the equipment may be impaired.

2
SPECIFICATIONS
Display: Liquid crystal display (LCD) with a maximum reading of 2500.
Polarity: Automatic, positive implied, negative polarity indication.
Overrange: "OL"or "-OL" is displayed.
Lowbatteryindication: the" "isdisplayedwhenthebatteryvoltagedrops
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.
AutoPoweroff:30minutesafterrotaryswitchandpushbuttonnochanges.turn
the meter off then on to resume operation.
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: 250mV,2.5V,25V,250V,600V
Resolution: 100µV
Accuracy: ±(0.25%rdg + 5dgts) on 250mV range
±(0.25%rdg + 1dgt) on other ranges
Input impedance: >10MW
Overload protection: 600VDC or AC rms
AC VOLTS (50Hz - 500Hz)
Ranges: 250mV,2.5V,25V,250V,600V
Resolution:1mV.(100µA on 250mV range)
Accuracy: ±(0.75% of reading + 4dgts) on 2.5V to 600V
no specification on 250mV range
Input impedance: 10MW
Overload protection: 600VDC or AC rms
DC CURRENT
Ranges: 250µA,2.5mA,25mA,250mA,2.5A,10A
Resolution: 100nA
Accuracy: ±(0.75%rdg + 10dgts) on 250µA,25mA ranges
±(0.75%rdg + 1dgt) on 2.5mA,250mA ranges
±(3.0%rdg + 5dgts) on A range
Burden voltage: 325mV on µA,mA ranges
700m V on A range
Input protection: 0.5A / 250V fast blow ceramic fuse
10A / 600V fast blow ceramic fuse
In 250µA, 25mA, 2.5A range use RELDbutton, offset the residual reading to
obtain the actual current, otherwise the measurement error would be great.

4
AC CURRENT (50Hz - 500Hz)
Ranges: 250µA,2.5mA,25mA,250mA,2.5A,10A
Resolution: 100nA
Accuracy: ±(1.5%rdg + 2dgts) on µA,mA ranges
±(3.0%rdg + 2dgts) on A range
Burden voltage: 325mV on µA,mA ranges
700mV on A ranges
Input protection: 0.5A / 250V fast blow ceramic fuse
10A / 600V fast blow ceramic fuse
RESISTANCE
Ranges: 250W,2.5KW,25KW,250KW,2500KW,25MW
Resolution: 100mW
Accuracy: ±(0.3%rdg + 3dgts) on 250Wrange
±(0.3%rdg + 1dgts) on 2.5KWto 2500KWranges
±(3.5%rdg + 4dgts) on 25MWrange
Open circuit volts: 0.4Vdc
Overload protection: 500VDC or AC rms
CONTINUITY
Audible indication: <100W
Overload protection: 500VDC or AC rms
DIODE TEST
Accuracy: ±(3.0%rdg + 3dgts)
Resolution: 1mV
Test current: 0.5±0.3mA
Test voltage: <1.6V

5
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.
Auto Power-down mode
If unused for about 30 minutes, the tester will power-down automatically.
Press RESET button switches to resume power-on mode. If you should
disableAutoPower-downmode,pressSELECTbuttomwhenyouturnonthe
meter.
SELECT Function Button (DC/AC),(WW
WW
W/ )
The SELECT Function button is Yellow in color. Press it to toggle to the
alternatefunction(AC,Audiblecontinuity,andDiode)showninYellowonthe
meter face.
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)buttonfor2seconds.The"AUTO"annunciatorturnsbackon.

6
RELDButton
Press (RELD) to enter the Relative mode, zero the display, and store the
displayed reading as a reference value. The relative mode annunciator(D) is
displayed.
Press (RELD) again to exit the relative mode.
Back-Light and Data-Hold Switch ( >2sec),( H):
Pressthisbuttonbriefly to activate DATA-HOLD mode. The"H"annunciator
is displayed.
Pressthisbuttonfor2secondstoturntheBack-Lighton.Asthisalsoactivates
the DATA-HOLD mode, briefly press the button to return to normal display.
The Back-Light will switch-off automatically after about 30 seconds.
RS232 Communication Button
Press (RS232) button to select the RS232 communication mode and turn on
the " RS232 " annunciator.In the this mode the automatic power-off feature is
disable.
Insert the IR2's optical interface side to female connector of the meter, and
theothersideofthiscableconnecttocommunicationport1or2ofthepersonal
computer.Execute the sofeware(for windows).
Press RS232 key again to exit the RS232 communication mode.

7
RESET Button
Press RESET button to reset or initialize system logic. If you suspect that the
meterisnotoperatingproperlyorthemeterwaspower-down,youcanalways
restart from the begining by press the RESET button.
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.Fordc,a(-)signisdisplayedfornegativepolarity;positivepolarityisimplied.
Current Measurements
1. Set the Function/Range switch to the desired current range (µA,mA,A)
position.
2. To toggle between "DC" and "AC" mode, press SELECT button. The "DC"
or "AC" annunciators is displayed in the upper left corner.
3.Forcurrentmeasurementslessthan250mA,connecttheredtestleadtothe
µAmA jack and the black test lead to the COM jack.
4. For current measurements of 250mA or greater, connect the red test lead
to the A jack and the black test lead to the COM jack.
5. Remove power from the circuit under test and open the normal circuit path
wherethemeasurementistobetaken.Connectthemeterinserieswiththe
circuit.
6. Use caution when measuring 10 amps on A range for 60s, please waiting
for 10 minutes for next measurement of 10 amps for safety reason.

8
Resistance Measurements
1. Set the Function/Range switch to W/position.
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.
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. Set the Function/Range switch to W/position.
2. Remove power from the equipment under test.
3. To toggle the W/continity/diode modes, press SELECT switch.
4.Touchprobestothediode.Aforward-voltagedropisabout0.6V(typicalfor
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.Ifthejunctionismeasuredinacircuitandalowreadingisobtainedwithboth
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.

9
Continuity Measurements
1. Set the Function/Range switch to W/position.
2. Turn off power to the circuit under test. External voltage across the
components causes invalid readings.
3. To toggle between the W/continity/diode modes, press SELECT button.
4. Connect the test leads to the two points at which continuity is to be tested.
The buzzer will sound if the resistance is less than approximately 100W.

10
MAINTENANCE
WARNING
Remove test leads before changing battery or fuse
or performing any servicing.
Battery Replacement
Powerissuppliedbya9volt"transistor"battery.(NEDA1604,IEC6F22).The
""appearsontheLCDdisplaywhenreplacementisneeded.Toreplacethe
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 protec-
tionfuse.Therearetwofuses;F1forthe"mA"jackandF2forthe"A"jack.For
accesstofuses,removethe fourscrewsfrom thebackofthemeter andliftoff
thebattery coverandcase. ReplaceF1 onlywiththeoriginaltype 0.5A/250V,
fastactingceramicfuse.ReplaceF2onlywiththeoriginaltype10A/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 tocoverhandlingandshipping time.Thisensuresthat OMEGA'scustomers receivemaximumcoverage oneach 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 defective it will be repaired or replaced at no charge.OMEGA'sWARRANTY 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,
orunauthorizedmodification.ThisWARRANTY isVOIDif the unit showsevidenceofhaving been tampered withor showsevidence
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 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 it
will be as specified and free of defects.OMEGA MAKES NO OTHERWARRANTIES 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 basicWARRANTY / 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. 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.

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