Insulation Tester Digital - HHMI60 Manual - Omega Engineering

250V/500V/1000V
User’s Guide
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CAT.¢ó 50V
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HHMI60
Digital Insulation Tester
®
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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’s 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 coverage on each product.
If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s
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problems relative to the product.
FOR NON-WARRANTY REPAIRS, consult
OMEGA for current repair charges. Have the
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DIGITAL INSULATION TESTER
OPERATION MANUAL
Contents
1.General Description ............................................................1
2.Panel Descriptions .............................................................1
3.Technical Specifications .....................................................2
4.Operation Instructions ........................................................4
5.Insulation Resistance Measurement ..................................4
6. Resistance and Continuity Measurement ..........................5
7.DCV Measurement .............................................................6
8.ACV Measurement .............................................................7
9.Data Hold and Backlit Display ............................................7
10.Safety Precautions and Maintenance ...............................8
11.Battery and Fuse Replacement ........................................ 9
12.Trouble Shooting ............................................................10
13.Standard Accessories ....................................................10
1. General Description
This instrument is a digital insulation tester which adopts
DC voltage converter of low consumption, high converter
ratio, and inductance type energy storage to convert the
voltage of 9V DC into 250V/500V/1000V DC. With digital
bridge, the instrument can test insulation and its main
features include easy to operate, wide test range, highly
stable performance, backlit LCD display, data hold and auto
power off. Using a shoulder strap, it can be used by both
hands. It is an ideal instrument that can be used in testing
insulation of electric machines, cables, electronic
equipments, electric facilities, etc.
2. Panel Description
250V/500V/1000V
1. Power switch/function switch: power ON/OFF the
instrument and selects functions. To save power, please
turn the switch to “OFF” when it isn’t in use.
2. LCD display: displays testing results and unit symbols
CAT.¢ó 50V
PRESS AND TURN-FOR
CONTINUOUS
3. E: Input terminal for the measuring object.
4. L: Terminal for connecting to the GND of the measuring
object
5. G: Protection terminal. When the measuring object is
required to add the protection loop to eliminate the leakage
effect, connect the electrode wire of the protection loop to
“G” terminal. It is also the negative input terminal for
measuring voltage, resistance and continuity.
6. Voltage measurement, resistance measurement (

3) To ensure measurement accuracy, warm up the
instrument for at least 10 seconds before operation.
5. Insulation resistance measurement:
1) According to the testing request, tune the function switch
to a suitable function.
2) Connect the electrode of the measuring object to the
relative terminals of the tester.
3) When testing a cable, connect ‘G’ terminal to the
protection loop.
4) Press “TEST” button to start the measurement. Read the
data after the display stabilized. For continuous
measurement, turn the function switch to the right and
lock it. Turn the function switch to the left can cancel the
continuous measurement. When press the “TEST”
button, the high voltage indicator turns red, and the high
voltage symbol will be displayed on the LCD. At the
same time, the beeper alarms with “tick-tick” sound. If
the resistance of the measuring insulation is 5% less
than the selected range or if there is a short circuit, the
beeper alarms with a long sound “tick……”
5) Connect the red lead “E” to the measuring object, and
black lead “L” to the EARTH. The line of Lead “E”
is required to be hung in the air.
6) If the LCD displays “1”, it indicates over range
operation. Please choose a higher range to get reading.
CAUTION!
1) When press the “TEST” button, output terminal“E”
will have high voltage output. Be careful, and avoid
electric shock.
2) Before testing, make sure the voltage range is correct,
and the LCD display is in accordance with selected
voltage.
3) During MΩ measurement, the environmental interference
or the instability of insulation material may cause
unstable readings. In this case, connect terminal “G” to
the end shield of the measuring object to get stable
readings.
6. Resistance and Continuity Measurement:
1. Tune the function switch to range 2000Ω.
2. Connect the red lead to “V/Ω” input terminal and black
lead to “G” input terminal.
3. Connect the test leads across the tested circuit. The
LCD will display the data.
4. If the tested resistance is less than approx.50Ω, the
beeper alarms
CAUTION!
1. If the tested resistance is over 2kΩ or there is an open
circuit, the LCD displays “1”.
2. When testing a live resistor, to ensure safety, do not
proceed testing until the tested circuit is completely
powered off and all capacitors are fully discharged.
3. If testing results have considerable errors, it may be
caused by other live components in the same circuit or
by electric potential on the two ends of the resistor.
4. Do not input voltage to the resistance range!
7. DCV Measurement:
1. Tune the function switch to DC 1000V range.
2. Connect the red lead to “V/Ω” input terminal and black
lead to “G” input terminal.
3. Connect the test leads across the tested circuit. The
LCD will display the voltage and polarity of the red lead
touched point.
CAUTION!
1. If there is residue number before measurement, it is
normal and will not affect the measurement. If the LCD
displays “1” during measurement, it indicates over
range operation.
2. The input voltage must not be over DC 1000V. Voltage
over DC 1000V will cause damage to the instrument
3
circuit.
3. During high voltage circuit measurement, do not touch
the high voltage. It’s dangerous to get electric shock!
8. ACV Measurement:
1. Tune the function switch to AC 750V range.
2. Connect the red lead to “V/Ω” input terminal and black
lead to “G” input terminal.
3. Connect the test leads across the tested circuit. The
LCD will display the voltage and polarity of the red lead
touched point.
CAUTION!
1. If there is residue numbers before measurement, it is
normal and will not affect the measurement. If the LCD
displays “1” during measurement, it indicates over
range operation.
2. The input voltage must not be over AC 750V. Voltage
over AC 750V will cause damage to the instrument
circuit.
3. During high voltage circuit measurement, do not touch
the high voltage. It’s dangerous to get electric shock!
9. Data Hold and Backlit Display
Data Hold:
Press the “HOLD” button, the current data will be held on
the LCD. Press the “HOLD” button again to cancel data
hold.
NOTE: There is no data hold function during insulation
resistance measurement.
Backlit Display:
Pressing “*” button, the LCD backlight turns on. Pressing “*”
button again, the LCD backlight turns off.
10. Safety Precautions and Maintenance
The tester is a precise instrument. User is not allowed to
apply any modification to the instrument circuit.
CAUTION!
1. To ensure safety, the measuring object must be
completely shut off from power supply and must be

testified by short circuit to be fully discharged and
doesn’t have any electrical hazard.
2. Do not input voltage over DC 1000V or AC 750V.
3. Don’t apply voltage measurement in the Ω range.
4. Do not apply any measurement until the instrument's
batteries are well installed or until the rear cover is
well loaded.
5. Before replacing battery or replacing fuse, remove all
test leads from the measuring object and turn off the
power switch.
6. Keep the instrument away from water and dust. Do not
fall or throw the instrument on ground.
7. Keep the instrument away from high temperature, high
humidity, flammable, explosive and strong magnetic
environment.
8. Use a piece of soft cloth with mild detergent and water to
clean the instrument. Do not use any abrasives or
strong solvent.
9. If you don’t use it for a long time, take out the batteries
from the instrument to avoid battery leakage
damaging the instrument.
10. When you use 9V battery, if the LCD displays low
battery symbol “ ”, replace battery.
11. Battery and Fuse Replacement
Battery Replacement
1) Use a screw driver to open the battery door’s screws,
and take off the battery door.
2) Take off the battery and replace with a new one. To
ensure long time battery power supply, it is
recommended to use alkaline batteries.
3) Close the battery door and tighten the screws.
Fuse replacement
The instrument uses a 100mA/60V resettable fuse.
In case of replacement, please use the fuse of same
specification, and follow instructions as below:
1) Tune the function switch to “OFF” position.
2) Use a screw driver to loosen the screws on the bottom,
and take off the bottom cover.
3) Remove the screws on the PCB, and take off the PCB.
4) Locate the resettable fuse on the PCB, which is marked
with “FUSE”. Use a soldering iron to take off the fuse
and replace it with a new one of the same spec.
12. Trouble Shooting
If the instrument dose not work properly, the following selfcheck
steps will help to solve general problems. If the fault still
exists, please contact the maintenance or local distributor.
Fault Solution
• Power off - please turn on
No display
the power
• Replace the batteries
symbol appearance • Replace the batteries
Error value • Replace the batteries
13. Standard Accessories
1. 10A test lead x1 pair
2. AA battery (1.5V) x6pcs
3. Operation manual x1pcs
4. Shoulder strap x1pcs
5. Crocodile clip x1 pair
The operation manual is subject to change without prior
notice. The contents in this operation manual are
considered to be correct.
If user finds out any mistakes or omissions, please contact
the manufacturer.
The manufacturer will not be responsible for any accident
or damage caused by improper operation.
4