Omega HHM32 User manual

OMEGA
HHM32
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
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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.

SAFETY INFORMATION
The following safety information must be observed to ensure maximum
personal safety during the operation of 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,
notformeasurementsof440 VACor600VACindustrialpowermains.The
unit is intended for use with low energy circuits to 1000VDC or 750VAC 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.
1

2
SPECIFICATIONS
Display:3¾digitliquidcrystaldisplay(LCD)withamaximumreadingof3999.
Polarity: Automatic, positive implied, negative polarity indication.
Overrange: (OL) or (-OL) is displayed.
Zero: Automatic.
Lowbatteryindication: the" "isdisplayedwhenthebatteryvoltagedrops
below the operating level.
Measurement rate: 1.5 times per second, nominal.
Analog bar graph: 41 segments with measurements 12 times per second.
Operating Environment: 0°C to 50°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, NEDA 1604, JIS 006P, IEC 6F22.
Battery life: 100 hours typical.
Dimensions: 192mm (H) x 91mm (W) x 52.5mm (D).
Weight: 301g including battery.
Accessories: One pair test leads, One spare fuse installed, 9V battery and
Operating Instructions.

3
DC VOLTS
Ranges: 400mV,4V,40V,400V,600V
Resolution: 100µV
Accuracy: ±(0.25%rdg + 1dgt)
Input impedance: 10MW
Overload protection: 500VDC or AC rms on 400mV range
1000VDC or 750VAC rms on all other ranges
AC VOLTS (50Hz - 500Hz)
Ranges: 400mV,4V,40V,400V,600V
Resolution: 100µV
Accuracy: ±(0.75%rdg + 4dgts) on 400mV,40V,400V ranges
±(1.2%rdg + 4dgts) on 600V range
±(1.5%rdg + 4dgts) on 4V range (100Hz to 500Hz)
Input impedance: 10MW
Overload protection: 500VDC or AC rms on 400mV range
1000VDC or 750VAC rms on all other ranges
DC CURRENT
Ranges: 4mA,40mA,4A,10A
Accuracy: ±(0.5%rdg + 1dgt) on 40mA range
±(2.0%rdg + 10dgts) on 4mA , 4A ranges
±(3.0%rdg + 1dgt) on 10A range
Input protection: 100mA / 250V fast blow fuse
10A / 600V fast blow ceramic fuse

4
AC CURRENT (50Hz - 500Hz)
Ranges: 4mA,40mA,4A,10A
Accuracy: ±(1.2%rdg + 4dgts) on 40mA ranges
±(3.0%rdg + 20dgts) on 4mA,4A ranges
±(3.5%rdg + 4dgts) on 10A ranges
Input protection: 100mA / 250V fast blow fuse
10A / 600V fast blow ceramic fuse
RESISTANCE
Ranges: 40W,400W,4KW,40KW,400KW, 4MW,40MW
Accuracy: ±(2.0%rdg + 10dgts) on 40Wrange
±(0.3%rdg + 4dgts) on 400Wrange
±(0.3%rdg + 1dgt) on 4KWto 4MWranges
±(1.0%rdg + 4dgts) on 40MWrange
Open circuit volts: 0.3Vdc (3.0Vdc on 40W,400W)
Overload protection: 500VDC or AC rms
CONTINUITY (400WW
WW
Wrange)
Audible indication: less than 40W±20W
Overload protection: 500VDC or AC rms
DIODE TEST
Ranges: 2V
Test current: 1.0mA ± 0.6mA
Accuracy: ±(3.0%rdg + 3dgts)
Open circuit volts: 3.0Vdc typical
Overload protection: 500VDC or AC rms

5
CAPACITANCE
Ranges:400pF,40nF,4µF,400µF,40mF
Accuracy: ±(2.0% rdg + 5dgts) on 400pF to 4µF ranges
±(5.0% rdg + 10dgts) on 400µF range
±(5.0% rdg + 50dgts) on 40mF range
FREQUENCY (Autoranging)
Ranges: Auto-ranging up to 40MHz
Accuracy: ±(0.05%rdg + 3dgts) on all ranges
Sensitivity: 1.0Vrms min
Overload protection: 500VDC or AC rms
LOGIC TEST
Threshold:Logic Hi : >1.5V, 2.4V, 4.0V
Logic Lo : <0.8V
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)
TEMPERATURE (Autoranging)
Ranges: -4°F to 2498°F
Resolution: 1°F
Accuracy: ±(2.0%rdg + 6°F) on -4°F to 923°F
±(3.0%rdg + 4°F) on 923°F to 2498°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.
Auto-Power-Off function
Once turning on the meter, the auto-power-off function starts to count if the
function does not change within 30 minutes, the auto-power-off condition
will be activated. When power-off happens, the final data is saved. If push
anyone of the push function (except HOLD and AC/DC key) that will turn
on the power again, and LCD segment "APO" will be turn on.
The auto-power-off feature can be disabled manually as a power-on option
by press MAX/MIN button while turning the meter on, and LCD segment
"APO" will be turn off.
Re-Power-On
Once auto-power-off happens, push anyone of the push function (except
HOLD and AC/DC key) or change the rotary mode can re-power-on the
meter. When anyone of the push function is enabled, the storage value will
display with HOLD mold (except logic state), if auto-power-off happened
under MAX/MIN (or PEAK, REL) mode, the PMAX , PMIN or relative and
reference value will be kept. But if re-power-on the meter with rotary mode,
the storage value will be cleared.

LCD Segment Check
Press HOLD button while turning the meter on, and all LCD segment will be
keep turn on until releasing HOLD button.
Hold Feature
PressingtheHOLDkeytoentertheDataHoldmode,the"HOLD"annunciator
is displayed. When HOLD mode is selected, the meter held the present
readings and stops all further measurements.
Pressing the " H " key again to cancel HOLD mode causing meter to resume
taking measurements.
IntheMIN/MAXrecordingmode,pressHOLDkeytostoptherecording.Press
HOLD key again to resume recording. (Previously recorded reading are not
erased).
MAX / MIN Record Feature
PressMIN/MAXkeytoentertheMIN/MAXRecordingmodeandautoranging
featureisdisabled,PushMIN/MAXkeytocyclethroughtheMax/Min/Present
readings. When LCD reads present value the "MAX MIN" annunciator will be
blinking.
To prevent accidental loss of MIN, MAX data, in this mode can only be
cancelled by pressing and hold down the MIN/ MAX key for 1 seconds to exit
and erased recorded readings.
7

8
PEAK ±Hold Feature
Pressing PEAK ±key to enter the PEAK ± hold mode, Push PEAK ±key to
cyclethroughthepeak+/ peak- readings. Topreventaccidental loss of PEAK
±data, In this mode can only be cancelled by pressing and hold down the
PEAK ±key for 1 seconds to exit and erased recorded readings. Under the
PEAK mode, if the pressed time>2 sec, the PEAK function will enter to
calibration mode, the LCD will show "CAL." and the internal buffer will
remember the internal OP offset voltage then back to the manu mode.
Whenever the PEAK function is enabled again, the reading value will minus
the offset voltage, the purpose is to get the real peak reading. Under PEAK
mode, the bargraph always show current value.
RANGE Button
Pressing RANGE key to enter the RANGE mode, the " " annunciator is
displayed. THE ranges of frequency and logic mode is selected by RANGE
key. Pressing and hold down the RANGE key for 1 seconds to exit RANGE
mode.
Inlogicmode1pushcanchangethelogichighreferencevoltagebetween4.0,
2.4 and 1.5V.
"" Button
Press " "buttonto toggle onandoff of backlight.Thebacklight will switch-off
automatically after 60 seconds.

9
REL relative Button
Pressing REL key to enter the Relative mode and the "D" annunciator is
displayed, then store the displayed Reading as a reference value.Pressing
RELkeyagainthe"DD
DD
D"annunciatorwillbeblinking,LCDreadsreferencevalue.
Pressingandholdingdown the REL keyfor1 seconds to exitRELmode.The
value (can not >±3999 counts) shown on the LCD is always the difference
between the stored reference and the present reading.
ZOOM Feature (analog Bargraph)
1.Voltage, Ohm, Current, Capacitance, Temperature and h FE mode (except
logic, Frequency and Continuity mode)
The default status of the bargraph display is normal mode (from left to
right). The unit of bargraph is 100 counts/bar, except the ZOOM function
mode is in the middle (10 counts/bar). Once this function is pushed, the
bargraph display will change to ZOOM function mode. But under the
PEAK mode, this function is disabled, even if ZOOM function is enabled
first.
The ZOOM function is like the REL mode which is always the difference
between the stored reference and the present reading, and store the
current input value as a reference value.
For instance: If the current reading is 100 counts and will be as reference,
the next step input reading is 200 counts, the bargraph number will be +10
counts, and the 200 counts will be as reference. If the input value is always
the same, the bargraph is zero.
2. Logic mode
In LOGIC mode, this key is used to turn on the buzzer whether is under
High, Low or unknown Logic (the default is High beep).

10
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 type (AC or DC) and
range. 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.
Current Measurements
1. Set the Function/Range switch to the desired current type (AC or DC) and
range.
2.Forcurrentmeasurementslessthan40mA,connecttheredtestleadtothe
"mA" jack and the black test lead to the "COM" jack.
3.Forcurrent measurementsover40mA or greater,connectthe redtestlead
to the "A" 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.

11
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.
5. In continuity test, the beeper sounds continuously, if the resistance is less
than 40W±20W.
WARNING
The accuracy of the functions might be slightly affected, when exposed to
a radiated electromagnetic field environment, eg, radio, telephone or
similar.

12
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.
8.In continuity test, the beeper sounds continuously, if the bargraph number
is less than 3 counts.
Transistor Gain Measurements
1. Set the Function/Range switch to the desired hFE range (PNP or NPN type
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.

13
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.
Capacitance (Cx) Measurements
1. Set the Function/Range switch to the desired Cx (capacitance) range.
2. Never apply an external voltage to the Cx sockets. Damage to the meter
may result.
3. Insert the capacitor leads directly into the Cx socket.
4. Read the capacitance directly from the display.
Capacitance (F) Measurements
1. Set the Function/Range switch to the desired F (capacitance) range.
2. Dischange capacitors before trying to measure it.
3. Connect the "+" lead to the "COM" jack and the "-" lead to the "mA" jack.
4. Read the capacitance directly from the display.

14
Temperature Measurements
1.Set the Function/Range switch to the "°F" position.
2.Connectatypekthermocoupletothejackontheinstrument.Placetheprobe
or thermocouple tip on or in the material to be measured and take the
temperature reading directly from the display.
Logic Measurements
1. Set the Function/Range switch to the " " position.
2.Connecttheredtestleadtothe"VW"jackandtheblacktestleadtothe"mA"
jack.
3.Connecttheredtestleadtothetestpointandtheblackleadtothecommon
buss of the logic circuit.
4. A " "on the display indicates logic high and a " " indicates a logic low.
Both indicators are on when the point of measurement is toggling high and
low.
RANGE Buttom
This key can change the logic high reference voltage between 4.0 , 2.4 and
1.5V.
ZOOM Buttom
Thiskeyisusedto turnonthebuzzerwhetherisunderHigh,Loworunknown
Logic (the default is High beep).
WARNING
Remove test leads being measured.

15
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-
tionfuse.Therearetwofuses;F1forthe"mA"jackandF2forthe"A"jack.For
access to fuses, remove the two screws from the back of the meter and lift off
the battery case. Replace F1 only with the original type 100mA/250V, fast
acting 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.
MAINTENANCE
WARNING
Remove test leads before changing battery or fuse
or performing any servicing.

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 tocover handling andshippingtime.This ensures thatOMEGA'scustomersreceive maximum coverageoneach 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'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 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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