Omega HHM23 User manual

OMEGA
HHM23
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:3½digitliquidcrystaldisplay(LCD)withamaximumreadingof1999.
Polarity: Automatic, positive implied, negative polarity indication.
Overrange: (OL) or (-OL) is displayed.
Zero: Automatic.
Lowbatteryindication: the" "isdisplayedwhen thebatteryvoltagedrops
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.
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: 200mV,2V,20V,200V,600V
Resolution: 100µV
Accuracy: ±(0.35%rdg + 1dgt)
Input impedance: 10MW
Overload protection: 500VDC or AC rms on 200mV range
600VDC or AC rms on all other ranges
AC VOLTS (50Hz - 500Hz)
Ranges: 200mV,2V,20V,200V,600V
Resolution: 100µV
Accuracy: ±(1.0%rdg + 4dgts) on 200mV to 200V ranges
±(2.0%rdg + 4dgts) on 600V range
Input impedance: 10MW
Overload protection: 500VDC or AC rms on 200mV range
600VDC or AC rms on all other ranges
DC CURRENT
Ranges: 200µA,2mA,20mA,200mA,10A
Accuracy: ±(0.5% dg + 1dgt) on µA,mA ranges
±(3.0%rdg + 1dgt) on 10A range.
Input protection: 0.5A / 250V fast blow ceramic fuse
10A / 600V fast blow ceramic fuse

AC CURRENT (50Hz - 500Hz)
Ranges: 200µA,2mA,20mA,200mA,10A
Accuracy: ±(1.2%rdg + 4dgts) on µA,mA ranges
±(3.5%rdg + 4dgts) on 10A range
Input protection: 0.5A / 250V fast blow ceramic fuse
10A / 600V fast blow ceramic fuse
RESISTANCE
Ranges: 200W,2KW,20KW,200KW,2MW,20MW
Accuracy: ±(0.4%rdg + 4dgts) on 200Wrange
±(0.4%rdg + 1dgt) on 2KWto 2MWranges
±(3.0%rdg + 4dgts) on 20MWrange
Open circuit volts: 0.3Vdc (3.0Vdc on 200Wrange)
Overload protection: 500VDC or AC rms
CONTINUITY
Audible indication: less than 100W
Overload protection: 500VDC or AC rms
DIODE TEST
Test current: 1.0mA±0.6mA
Accuracy: ±(3.0%rdg + 3dgts)
Open circuit volts: 3.0Vdc typical
Overload protection: 500VDC or AC rms
4

5
CAPACITANCE
Ranges:2nF,20nF,200nF,2µF,20µF
Accuracy: ±(2.0%rdg + 10dgts)
Test frequency: 2.5Hz
FREQUENCY (Autoranging)
Ranges: 2KHz,20KHz,200KHz,2000KHz,15MHz
Accuracy: ±(0.1%rdg + 1dgt)
Sensitivity: 1.0Vrms min
Overload protection: 500VDC or AC rms
Effect Reading: 10 - 1999
LOGIC TEST
Threshold: Logic Hi (2.8 ± 0.8V)
Logic Lo (0.8 ± 0.5V)
Indication: 40 msec beep at logic low
Frequency response: 20MHz
Detectable pulse width: 25nS
Pulse limits: >30% & <70% duty
Overload protection: 500VDC or AC rms
TRANSISTOR hFE
Ranges: 0 - 1000
Base current: 10µAdc approx. (Vce=3.0Vdc)

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.
Max. Hold Feature
Press "MAX" to toggle in and out of the Maximun Hold mode.(holding the
highest reading.) In the MAX mode, the MAX annunciator is displayed and
maximun reading are stored in display register, If the new reading is higher
than the reading being displayed, the higher reading is transferred to the
display register. A "higher" reading is defined as the reading with the higher
absolute value.
The MAX hold function is disable in the frequency count mode, but the MAX
annunciator is still displayed.
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 range and press the
"AC/DC" switch to toggle between the desired voltage type. If magnitude
of voltage is not known, set switch to the highest range and reduce until a
satisfactory reading is obtained.
3. Connect the test leads to the device or circuit being measured.
4.Fordc,a(-)signisdisplayedfornegativepolarity;positivepolarityisimplied.

7
Current Measurements
1. Set the Function/Range switch to the desired current range and press the
"AC/DC" switch toggle between to the desired current type.
2.Forcurrentmeasurementslessthan200mA,connecttheredtestleadtothe
µAmA jack and the black test lead to the COM jack.
3.Forcurrentmeasurementsover200mAorgreater,connecttheredtestlead
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
wherethemeasurementistobetaken.Connectthemeterinserieswiththe
circuit.
5.Usecautionwhenmeasuring10ampson10Arangefor60s,pleasewaiting
for 10 minutes for next measurement of 10 amps for safety reason.
Resistance and Continuity Measurements
1.SettheFunction/Rangeswitchtothedesiredresistancerangeorcontinuity
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. In continuity test, the beeper
sounds continuously, if the resistance is less than 100W.
WARNING
The accuracy of the functions might be slightly affected, when exposed to
a radiated electromagnetic field environment, eg, radio, telephone or
similar.

8
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.Touchprobestothediode.Aforward-voltagedropisabout0.6V(typicalfor
a silicon diode).
5. Reverse probes. If the diode is good, "OL" is displayed. If the diode is
shorted, ".000" or another number is displayed.
6. If the diode is open, "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.
Capacitance Measurements
1. Set the Function/Range switch to the desired capacitance range.
2. Never apply an external voltage to the sockets. Damage to the meter
may result.
3. Insert the capacitor leads directly into the socket.
4. Read the capacitance directly from the display.

9
Transistor Gain Measurements
1.SettheFunction/RangeswitchtothedesiredhFErange(PNPorNPNtype
transistor).
2. Never apply an external voltage to the hFE sockets. Damage to the meter
may result.
3. Plug the transistor directly into the hFE socket. The sockets are labeled E,
B and C for emitter, base, and collector.
4. Read the transistor hFE (dc gain) directly from the display.
Frequency Measurements
1. Set the Function/Range switch to the Hz position.
2. Connect the red test lead to the "VW" jack and the black test lead to the
"COM" jack.
3.Connectthetestleadstothepointofmeasurementandreadthefrequency
from the display.
Logic Measurements
1. Set the Function/Range switch to the LOGIC position.
2. Connect the red test lead to the "VW" jack and the black test lead to the
"COM" jack.
3.Connecttheredtestleadtothetestpointandtheblackleadtothecommon
buss of the logic circuit.
4. A " "on the display indicates TTL logic high and a " " indicates a TTL
logiclow. Bothindicators areon whenthe pointof measurementis toggling
high and low.

MAINTENANCE
WARNING
Remove test leads before changing battery or fuse
or performing any servicing.
Battery Replacement
Powerissuppliedbya9volt"transistor"battery.(NEDA1604IEC6F22).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-
tion 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
liftoffthebattery cover and case. Replace F1onlywiththe 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 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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