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User Manual
Megohmmeter
PCE-MO 1500
Safety Requirements & Safety Warnings:
This insulation resistance tester is designed and produced according to the safety standard
IEC1010. Strictly follow the safety standards of double insulation CAT III 1000V CAT IV
and pollution degree 2.
Precautions:
Safety Symbol Description:
Caution! Refer to the user’s manual before using this meter. Double Insulation Warning!
Dangerous Voltage (Risk of electric shock).
Danger: To avoid serious or fatal damage that may be caused by certain states and wrong
operations.
Warning: indicates avoiding the risk of electric shock.
Caution: indicates avoiding damage to the instrument and making accurate measurements.
· Do not test in flammable locations, sparks may cause an explosion.
· Do not operate the instrument if the instrument surface is wet or if the operator's hands
are wet.
· When testing voltage, there is a possibility of personal injury due to accidental
short-circuit between metal parts and test leads.
· Do not exceed the maximum allowable range of the measuring range during measurement.
· Do not open the battery cover during measurement.
· When performing insulation measurement, do not touch the line under test.
Warning
· If the instrument is abnormal, please stop using it. For example: Broken instrument or
exposed metal parts, please do not use it in this situation.
· When the test lead is inserted into the instrument interface and connected to the circuit
for testing, do not press the function button, but exit the measurement first, and then
change the test item. ·
Do not install substitute parts or make any unauthorized changes to the instrument.
· Do not replace the battery when the instrument is wet.
· Make sure all test leads are securely connected to the meter's test sockets.
· Make sure the instrument is turned off before opening the battery cover.
Caution:
· Before measuring, confirm that the function button is selected to the appropriate
position.
· After use, press and hold the “OFF” button to turn off the unit. If you do notuse it
for a long time, please take out the battery and storage it.
·Do not storage for a long time in high temperature, humidity, places where condensation
may occur, or in direct sunlight.
· Please use a damp cloth or detergent to clean the instrument case, do not use abrasives
or solvents to wipe the
· When the instrument is wet, please dry it before use or storage.
To protect your safety, please read the manual before using it.
instrument case and accessories.
Measuring range:
0.1MΩ~20GΩ
1000V:
2500V: 1MΩ~200GΩ
5000V: 10M~200GΩ, automatic range conversion.
·Easy to operate and carry.
· Strong load capacity, <1.8mA output short-circuit current.
· Complete protection circuit, not afraid of voltage counterattack, output short
circuitprotection.
· It can measure AC/DC voltage 10V-600V, AC voltage frequency 40Hz ~ 70Hz.
· Dust-proof and moisture-proof structure, suitable for outdoor operation.
· Dimensions: 180X140X70 (mm)
· Weight: about 800g (including battery)
A.
Technical Data
Working conditions: 0°C~35°C, relative humidity 75% o
level
Output voltage: ±10% (output load >=1000MΩ)
Short c
ircuit current: about less than 1.8mA;
Low battery indication: Display shows
Insulation resistance: >=500MΩ (1000V);
Withstand voltage: AC 2KV 50Hz 1 minute;
Working t
85% or less;
Table 2. 2500V technical para meters
Output voltage: ±10%
250V/500V/1000V/2000V/2500V
emperature and humidity: working temperature 0°C~40°C, relative humidity
r less, 2000 meters above sea
General:
Insulation resistance tester (or high voltage insulation meter) is a special instrument for
measuring insulation resistance. It is an ideal test instrument for measuring insulation
resistance of large transformers, transformers, generators, high-voltage motors, power
capacitors, power cables, arresters, etc.
· Automatic release voltage function.
· Suit
able for measuring insulation resistance of various electrical equipment and
insulating materials such as transformers, motors, cables, switches, electrical appliances, etc.
It is suitable for the maintenance, repair, test and verification of various electrical
equipment.
· Rated output voltage variable
The rated output voltage can be switched by the function buttons "▲" "▼":
1000V switches between 50V, 100V, 250V, 500V, 1000V
2500V switches between 250V, 500V,1000V,2000V, 2500V.
5000V switches between 500V, 1000V, 2500V, 5000V.
· High voltage indication
There is a red LED light in the machine indicating that there is high voltage output in the
instrument, there is a danger of electric shock, the operator should pay special attention to
safety.
· Low battery voltage indication " ".
· Battery-driven, easier to use.
· 2000 digits with bar graph display, easy to read the data.
B
Appearance
.
1. Insulation resistance measurement high voltage output jack L
2. Positive terminal of AC/DC voltage measurement
3. Voltage measurement input negative shielding end G (shielding end)
4. Insulation resistance measurement sampling jack E
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5. Display LCD screen
6. Insulation resistance measurement high voltage start button
7. Insulation resistance voltage selection button "▲"
8. Insulation resistance voltage selection button "▼"
9. Data hold/backlight button,
10. Data read/save button
11. Function selection button; can choose between insulation resistance/AC voltage/DC
voltage functions
12. Polarization index DAR and absorption ratio PI buttons
13. Power switch button: Press and hold for more than 2 secon ds to turn on, and then press
and hold for mo re than 2 second s to turn off.
1. Be sure to read this manual carefull y before use, and follow the instructions in sequence.
2. Do n ot use accessories not provided by the original factory to avoid danger.
3. During the test, there is a DC high voltage output on the measuring terminals E and L of
the instrument. It is strictly forbidden to touch the human body to avoid electric shock.
4. In order to avoid the error caused by the insulation leakage of the test rod itself, the test
rod connected to the measuring end L of the instrument should be suspe nded as much as
possible, so as not to touch the extern al objec ts or the test wire of the E end.
5. When the insulation resistance value of the measured object is high, and the meas urement has serious word jumping phenomenon, you can connect the shield terminal "G" of
the instrument. For example: when measuring the insulation between the cable core and the
cable shell, in addition to connecting the two e nds of the objec t to be measured to the "E"
and "L" ends, then connect the inner layer of insulation betw een the cable shell and the core
to the s hield of the in strument Terminal "G" to eliminate measurement errors due to surface
leakage (as shown in below picture). The method of adding a shielding box can also be
used, that is, placing the object und er test in a metal shielding box, and then connecting the
shielding box to the shield "G" terminal of the instrum ent.
6. After the test is complete d, re move the connecting wire.
7. The instrument should not be used and stored in sunlig ht, high temp erature and high
humidity places.
8. The long-term short-circuit of the measuring end shall not exceed 60s;
9. The measurement continuous working time should not exceed 30 minutes;
▲Attention
a. When measuring insulation resistance, please place the two test leads strictly apart, do not
twist them together.
b. Do not short-circuit the two test leads and the high-vol tage output in the high-voltage
output state before measuring the insulation resistance.
c. Do not take measurements if the battery cover is open.
Plug the red test lead into the meter's "L" inpu t jack and the black test lead into the "E" input
jack.
1. Test connection
Connect the wiri ng of the "E" end jack of the meter (black test lead wit h alligator clip) to
one end of the object to be tested; clip the wiring of the "L" end jack of the meter (red test
lead with alligator clip) to the other end of the tested object, You can also hold the test rod
with one hand to make the test needle contact the other en d of the object to be tested.
When operating with one hand, the other hand or other parts of the body should not be in
contact with any part of the test circuit . O ne i s for safety, and the other is not to affect the
test line. The accuracy of the measurem ent; the wiring of the G end jack of the instrument is
a shielded wire (with a larg e
Test clip), connected to the surface of the DU T to prevent surface le akage from affe cting
the test impedance (as shown in Figure A a nd F igure B).
*Before testing, make sure there is no electricity in the circuit unde r test, d o not measure live
equipment or insulation with circuits.
*After the measurement, do not touch the circuit with your hands, the sto red capacitance of
the circuit can cause clicks.
*Do not measure if the batt ery cover is open .
1. After power on, press the "SELEC T" key on the instrum ent panel to select AC voltage
measurement, the display shows the voltage "AC" unit symbol V.
2. Insert the re d tes t lead in to the "AC/ DC600V" jack, and the black test lead into the "G"
jack.
3. Touch the two test leads to the two ends of the voltage to be measured, and the display
shows the measured AC voltage in volts.
Notice:
*The measured voltage should not exceed the rms value of 600V AC vol tage, and the
frequency of the AC voltage is 4 0Hz to 7 0Hz. T he data e rror measured beyond this
frequency range will exceed the technical specifications of the machine.
*After completing all measurements, disconnect the test leads from the circuit under test
and remove the test leads from the ins trument input
*Do not measure if the batt ery cover is open .
I. DC Voltage Test
1. After power on, press the "SELECT" key on the instrument panel to se lect DC voltage
measurement, the display shows the voltage "DC" unit symbol V.
2. Insert the plug end of the red test lead into the "AC/DC600V" jack, and the plug end of
the black test lead into the "G" input jack.
3. Put the two test leads in contact with the two ends of the voltage to be measured, and the
measured DC voltage in volts will be displ ayed on the d isplay.
Notice:
*The measured voltage should not exceed the rms value of 60 0V DC volta ge.
*After completing all measurements, disconnect the test leads from the circuit under test
and remove the test leads from the instrumen t input
*Do n ot measure if the battery cove r is open.
J.Data Hold/Backlight Operation
1. Press the "HOLD/*" button for more than 2 second s, the backl ight will be on; press the
"HOLD/*" button again for more than 2 s econds, the backlight will be off;
2. Press "HOLD/*" to hold data, press again to ex it data hold.
1. Store data
After measuring the insulation resistance value, press the "HOLD/*" key to keep the
measurement data first, the display shows the "HOLD" symbol, and then press " " to save
the data, the "MEM" symbol is displayed at the bo ttom of the display to store the current
measurement data, Long press the " " key to exit the storage, repeating this operation,
the instrument can store 100 sets of data.
2.Read data After power on, press the " " button, the "READ" symbol will be displayed at
the bottom of the display to e nter the re ading data, press the button " ▲""▼" to read up and
down other stored data; long press " " to e xit the data reading.
3. Delete data
After power on, press the" " button, the "READ" symbol will be displayed at the bottom
of the display to enter the data reading mode, press "
" to delete the current data, after the
data is deleted, the display will display "--", press the "▲""▼" button to go up Scroll down
to other groups of data, and then press the " " key to delete the data to be deleted in other
groups; press
1. Stop all test work and disconne ct the tes t leads from the item under test.
2. Disconnect the test leads from the meter.
3. Remove the battery cover from the back of the meter.
4. Put in 8 batteries. The model is (AA) /1.5V, pay attention to the position and polarity of
the batteries.
5. Install the battery cover and screw on the battery cover.
PI（Polarization Index
Measurement）
10 minutes insulation resistance / 1 minute insulation
resistance
PI（Polarization Index
Measurement）
≥4
4---2
2.0--1.0
≤1.0
Judgement standard
best
good
warning
bad
DAR（absorption ratio
measurement）
1 minute insulation resistance / 15 seconds insulation
resistance
DAR（absorption ratio
measurement）
≥1.4
1.25--1.0
≤1.0
Judgment standard
best
good
bad
C. Safety Precautions
D. Insulation resistance measurement
2.Selection of rated voltage
Press the "▲""▼"key on the instrument panel to select the appropriate voltage.
2500V can choose 250V/500V/1000V/2000V/2500V
3.Insulation resistance measurement
Press and hold the " " button for >=2 seconds to turn on the machine. After turning on the
machine, it is recognized as insulation resistance measurement, and the display shows"---".
Press the "▲" and "▼" keys on the instrument panel to select the appropriate voltage, and
the selected voltage is displayed in the lower right corner of the display, connect the test lead
of the test rod to the two ends of the test object, press the "TEST" button on the instrument
panel to output the insulation resistance test voltage, and the test light in the button emits a
red warning, the lower right corner of the display screen displays the insulation resistance test
voltage, and the display .The measurement time is displayed at the bottom left of the screen,
and the insulation resistance value is displayed in the middle of the screen. Press the "TEST"
button again to end the measurement, and the test light in the "TEST" button goes out, and
the measured value of insulation resistance remains in the middle of the display. Notice
E.Absorption ratio DAR measurement
When the insulation resistance measurement time is greater than 1 minute, the measurement is ended. Press the "DAR/PI" key on the instrument panel and the display will displ ay
the "DAR" symbol. The instrument will automatically calculate the absorptio n ratio and
display it in the lower left corner of the display; The ratio of the insulation resistance value at
1 minute to the insulation resistance value at 30 seconds.
F. Polarization Index PI Measurement
After the insulation resistance measurement time is greater than 10 minutes, the measurement is ended. Press the "DAR/PI" key on the instrument panel until the display shows
the "PI" symbol. The instrument will automatically calculate the polarization index value
and display it in the lower left corner of the display; "Polarization" The index PI" is the
ratio of the insulation resistance value at 10 minutes to the insulation resistance value at 1
minute.
Insulating materials all have the absorption process and polarization process of charge after
adding high voltage. The power system requires that the polarization index sho uld be
measured in the insulation test of the main transformer, cable,
motor, etc., and this data can be used to judge the quality of insulation, quality and aging
problems.
G. AC voltage test
H. Store data/read data
"DAR/PI" to delete all data.
I. Shut down
After the test is completed, press and hold the
" " key for more than 2 seconds, the LCD
screen will not display, and the power of the
instrument will be turned off. For capacitive
loads, the residual charge on the test product should be discharged first to prevent the
residual charge discharge from hurting people. Then remove the test leads.
J. Replacement battery
If "E3" is displayed on the LCD during use, the battery capacity is insufficient, please replace
the battery. Before replacing the battery, make sure the test leads are disconnected and the
power is turned off.
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