Omega Products HHM31 Installation Manual

OMEGA

HHM31

Digital Multimeter

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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.

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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. 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.

1

SPECIFICATIONS

Display: 3½ digit liquid crystal display (LCD) with a maximum reading of 1999.
Polarity: Automatic, positive implied, negative polarity indication.
Overrange: (OL) or (-OL) is displayed.
Zero: Automatic.
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.

Power: single standard 9-volt battery, NEDA 1604, JIS 006P, IEC 6F22.
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.

2

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

Input impedance: 10MW
Overload protection: 500VDC or AC rms on 200mV range

±(2.0%rdg + 4dgts) on 600V range

600VDC or AC rms on all other ranges

DC CURRENT

Ranges: 200µA,20mA,200mA,10A
Accuracy: ±(0.5%rdg + 1dgt) on µA,mA ranges

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

±(3.0%rdg + 1dgt) on 10A range

10A / 600V fast blow ceramic fuse

AC CURRENT (50Hz - 500Hz)

Ranges: 200µA,20mA,200mA,10A
Accuracy: ±(1.2%rdg + 4dgts) on µA,mA ranges

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

±(3.5%rdg + 4dgts) on 10A range

10A / 600V fast blow ceramic fuse

3

RESISTANCE

Ranges: 200W ,2KW ,20KW ,200KW ,2MW ,20MW
Accuracy: ±(0.4%rdg + 4dgts) on 200W range

±(0.4%rdg + 1dgt) on 2KW to 2MW ranges.
±(3.0%rdg + 4dgts) on 20MW range

Open circuit volts: 0.3Vdc (3.0Vdc on 200W range)
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 + 3dgt)
Open circuit volts: 3.0Vdc typical
Overload protection: 500VDC or AC rms

CAPACITANCE

Ranges: 2nF,20nF,200nF,2µF,20µF
Accuracy: ±(2.0%rdg + 10dgts)
Test frequency: 2.5Hz

4

FREQUENCY (Autoranging)

Ranges: 2KHz,20KHz,200KHz,2000KHz,15MHz
Accuracy: ±(0.1%rdg + 1dgt)
Sensitivity: 2.0Vrms min
Overload protection: 500VDC or AC rms
Effect Reading: 10 - 1999

TEMPERATURE ELECTRICAL

Temperature Scale: Celsius or Fahrenheit user-selectable
Measurement Range: -50°C to 1300°C, (-58°F to 2000°F)
Resolution: 1°C or 1°F, 0.1°C or 0.1°F
Accuracy: Accuracy is specified for operating temperatures over the range

of 18°C to 28°C (64°F to 82°F), for 1 year, not including thermocouple error.

±(0.3%rdg + 1°C) -50°C to 1000°C
±(0.5%rdg + 1°C) 1000°C to 1300°C
±(0.3%rdg + 2°F) -58°F to 2000°F

Temperature Coefficient: 0.1 times the applicable accuracy specification

per °C from 0°C to 18°C and 28°C to 50°C (32°F to 64°F and 82°F to 122°F).

Input Protection: 24V dc or 24V ac rms maximum input voltage on any

combination of input pins.

Input Connector: Accepts standard miniature thermocouple connectors (flat

blades spaced 7.9mm, center to center).

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.

Max. Hold and Back-Light ( >2sec) Switch :

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.
Press this button for two seconds to turn the Back-Light on. As this also
activates the MAX hold mode, briefly press the button to return to normal
display. The Back-Light will switch-off automatically after about 20 seconds.

6

T1,T2, T1-T2 Temperature Measurement

Remove test leads being measured.

WARNING

1. Set the Function/Range switch to the T1 thermocouple, T2 thermocouple

or the difference between the two thermocouples (T1-T2), and The LCD

indicates which is selected.

2. Selecting the Temperature Scale:

Readings are displayed in either degrees Celsius(°C) or degrees

Fahrenheit(°F). To change the temperature scale, press the "°C/°F "key.

3. Selecting the Display Resolution

The meter allows two choices of resolution:

High resolution: 0.1°C or 0.1°F

Low resolution: 1.0°C or 1.0°F
To select the alternate display resolution, press the corresponding "0.1°/
1°" key.

4. 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.

7

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. 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
"AC/DC" switch toggle between to the desired current type.

2. For current measurements less than 200mA, connect the red test lead to the
µAmA jack and the black test lead to the COM jack.

3. For current measurements over 200mA 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.

8

Resistance and Continuity Measurements

1. Set the Function/Range switch to the desired resistance range or continuity
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.

9

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, "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. 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.

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.

10

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. Connect the test leads to the point of measurement and read the frequency
from the display.

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.

12

HHM31 CALIBRATION PROCEDURE

Note: Only qualified technicians who have access to the items, as following should

perform the following calibration procedure.

Equipments: The class of calibrator had better 10 times greater than the measured meter.

DCV Calibration

Set the function /range to the DC 200mV，then apply 190.0mV to the V-W and

COM input jacks.

Adjust R41 until display reads 1900±1dgt then disconnect the source from the

measured meter.

DCA Calibration

Set the function /range to the 10A, set the output of the current calibrator for

1.9A, and connect it the 10A and COM jacks.
Adjust the shunt resistor until the display reads 1.9A, if the reading over 1.9A

then add solder onto the shunt resistor, below 1.9A then cut CuMn Shunt Resistor
slightly with diagonal cutters or shave away some of solder from the Shunt.

Temperature Calibration

Insert the K type thermocouple to the female connector, and the other side of

this probe to Temperature Calibrator. We must allow the K type to stabilize for at
least 1 minute and make sure “+” and “-“ polarity is right position.

1. Set the range to the T1/0.1°C, and then apply 0°C to T1 input (T2 input open)

adjust R845 and R846 (fine adj.) until LCD reading reads 0.0±0.1°C.

2. Set the range to the T1/0.1°F, and then apply 0°F to T1 input (T2 input open)

adjust R804 until LCD reading reads 0.0±0.1°F.

3. Set the range to the T1/0.1°F, and then apply 165°F to T1 input (T2 input

open) adjust R891 until LCD reading reads 165.0±0.1°F.

4. Set the range to the T1/1°F, and then apply 1832°F to T1 input (T2 input

open) adjust R824 until LCD reading reads 1832±1°F.

5. Set the range to the T1/1°C, and then apply 1000°C to T1 input (T2 input

open) adjust R806 until LCD reading reads 1000±0°C.

6. Set the range to the T2/0.1°C, and then Apply 0°C to T2 input (T1 input open)

adjust R82 and R83 (fine adj.) until LCD reading reads 0.0±0.1°C.

1

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 cov erage 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 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 an y damages that result fr om 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 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.

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 f ollowing

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.

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.

WARRANTY / DISCLAIMER

RETURN REQUESTS / INQUIRIES

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.

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

M-3194/0799

DATA ACQUISITION

þ Data Acquisition &

Engineering Software

þ Communications-Based

Acquisition Systems

þ Plug-in Cards for Apple, IBM

& Compatibles

þ Datalogging Systems

þ Recorders, Printers & Plotters

HEATERS

þ Heating Cable

þ Cartridge & Strip Heaters

þ Immersion & Band Heaters

þ Flexible Heaters

þ Laboratory Heaters

ENVIRONMENTAL
MONITORING AND CONTROL

þ Metering & Control Instrumentation

þ Refractometers

þ Pumps & Tubing

þ Air, Soil & Water Monitors

þ Industrial Water & Wastewater

Treatment

þ pH, Conductivity & Dissolved Oxygen

Instruments