DIGITAL INSULATION
INSULATION RESISTANCE TESTER
Model MIS-2D/3D/4D
INSTRUCTION MANUAL
Thank you very much for selecting our digital insulation resistance tester.
This model is complex instrument and employs a very reliable mechanical/
electronic design.
Before use the instrument, read this instruction manual completely and
familiarize yourself thoroughly with all functions.
Keep this instruction manual carefully to take out whenever you need.
MULTI MEASURING INSTRUMENTS CO., LTD
Akihabara Murai Bldg. 7F, 1-26 Kanda Sakuma-cho,
Chiyoda-ku, Tokyo, Japan, 101-0025
TEL : +81-3-3251-7016 FAX : +81-3-3253-4278
Home Page: http://www.multimic.com/
E-mail: multi@multimic. com
1. FEATURES
● MIS series are 3 ranges insulation resistance tester designed for testing of
electrical installations and equipment in accordance with IEC international
standard.
● Battery operation and heavy duty rugged case is used for high performance
insulation testing.
● The big digital and bar graph LCD display with back light enabled easy observation.
Especially, useful when working in dark place.
● Hand free and continuous measurements with custom made MΩ test switch.
● The voltage in the circuit or capacitor can be checked by warning lamp for safe
insulation measurements.
● Data hold and auto power off function.
● Ultra compact, light weight.
2. SAFETY SUMMARY
● The CAUTIONs and WARNlNGs which appear on the following pages must be
followed to ensure operator safety and to retain the operating conditions of the
instrument.
Safety Symbols:
indicates the operator must refer to an explanation in this manual.
indicates terminals at which dangerous voltages may exist.
WARNING
● To avoid electrical shock, use CAUTION when working with more than
60V DC or 25V rms.AC since the danger of electric shock exist.
In addition, check that the test leads are normal condition.
● POSSIBLE ELECTRICALSHOCK:
Do not make measurements if the case is damaged.
Make sure that the terminals and the connecting cables are in a good
condition and that the proper measuring function has been selected.
● POSSIBLE ELECTRICAL SHOCK or FIRE HAZARD:
Do not expose this instrument to rain or moisture.
Do not operate the instrument in the presence of flammable gasses or
fumes.
● This instrument must be used only by professionals. Any adjustment,
maintenance and repair of the opened apparatus under voltage shall be
carried out only by a skilled person who is aware of the hazard involved.
CAUTION
Where it is likely that the protection has been impaired, the instrument
shall be made inoperative and be secured against any unintended operation.
The protection is likely to be impaired if the instrument:
● shows visible damage.
● fails to perform the intended measurements.
● has been subjected to prolonged storage under unfavourable conditions.
● has been subjected to severe transport stresses.
3. SPECIFICATIONS
Function: Insulation resistance, AC voltage
Display: 3 1/2 digit LCD with bar graph, max. reading of 3200 count and annunciators
Response time: Less than 5 sec. (auto ranging)
Data hold indication: “DH” mark on LCD readout
Infinity indication: “OL (∞)” mark on LCD readout (over 3200 count)
Safety standard: IEC 61010-1, CAT. II 600V phase to earth
EMC standard: EN 61326
Constructional standard: IEC 61557-2
Insulation resistance: DC 500V-50MΩ or more (MIS-2D)
DC 1000V-50MΩ or more (MIS-3D, MIS-4D)
Withstanding voltage: AC 3700V/1minute, between input terminal and outer case
Low battery indication: “B” mark on LCD readout
Temperature characteristics (0~40℃): ±5%rdg of specified accuracy
Operation temperature: 0℃ to 40℃, less than 80% RH without condensation
Storage temperature: -10℃ to 60℃, less than 80% RH without condensation
Power supply: 1.5V alkaline batteries (AA size, LR-6) x 6
Dimension: 170(W) x 105(H) x 54(D)mm, approx. 365g (excluding batteries)
Accessories: Line test lead .......... 1
Earth test lead ........ 1 Line test lead
Batteries ................. 6
Test leads case ...... 1 Earth test lead
Belt ......................... 1
Instruction manual .. 1
Optional accessory: Test lead with remote switch
4. MEASURING RANGES AND TECHNICAL DATA
● Insulation resistance measurement
Model
MIS-2D
MIS-3D
MIS-4D
Rated voltage &
effective measuring
range
125V-20MΩ
250V-50MΩ
500V-100MΩ
250V-50MΩ
500V-100MΩ
1000V-2000MΩ
125V-20MΩ
250V-500MΩ
1000V-2000MΩ
Min. measurable
resistance at
rated voltage
0.125MΩ
0.25MΩ
0.5MΩ
0.25MΩ
0.5MΩ
1MΩ
0.125MΩ
0.25MΩ
1MΩ
Rated current
1mA +20% -0%
Max. no-load voltage
Rated voltage +30% -0%
Short circuit current
<2mA
● Accuracy
Rated voltage
DC125V
DC250V
DC500V
DC1000V
Measuring range
0~20MΩ~OL(∞)
0~50MΩ~OL(∞)
0~100MΩ~OL
(∞)
0~2000MΩ~OL
(∞)
First effective range
0.02~10MΩ
<±5%rdg
0.05~20MΩ
<±5%rdg
0.1~50MΩ
<±5%rdg
2~1000MΩ
<±5%rdg
Second effective
range
0.01~0.02MΩ
10~100MΩ
<±10%rdg
0.02~0.05MΩ
20~100MΩ
<±10%rdg
0.05~0.1MΩ
50~100MΩ
<±10%rdg
1~2MΩ
1000~2000MΩ
<±10%rdg
Other range
100MΩ~OL(∞)
Not specified
2000MΩ~OL(∞)
Not specified
● AC voltage measurement (50Hz/60Hz)
Range
Accuracy
Input impedance
Max. input voltage
AC 600V
±2.5% of full scale
approx. 20MΩ
AC 600V rms
5. PANEL FUNCTIO
⑦
＊⑬
① MEASURE MΩ test switch (*1)
② LCD display
③ Unit cover
④ Battery compartment cover
⑤ Belt connecting hole
⑥ Opening direction
⑦ To open the unit cover, depress the yellow button of the front
⑧ Data hold switch (*2)
⑨ Backlight switch (*3)
⑩ Range selector switch
⑪ Line terminal
⑫ Earth terminal
⑬ The unit cover can be settled on the bottom of the unit
⑭ HV lamp
①
Note: *1 The custom made MΩ test switch is used for hand free and continuous
measurements. When the switch knob is pulled up, the switch is locked
at continuous “ON” position. Thus, the continuous measurements are
enabled without any switch operation.
*2 This switch is used to hold the displayed data during measurement.
When pressed, the displayed value is held and “DH” mark appears in the
display in this condition.
*3 This switch is used to turn on the LED back light.
When pressed, the LED back light is lit for 10 minutes. By pressing this
switch once again, the LED back light will be off.
6. METHOD OF MEASUREMENT
6-1. Precautions for Use
● Always check to make sure that the range selector switch is set to the proper
position.
● Before making measurements, make sure that the terminals and test leads are in
a good condition.
● Before making any measurement, make sure that the pointer of the instrument
correspond to exactly to the zero at the beginning of the scale.
● When MEASURE MΩ test switch is set to “ON” position, a high voltage is being
generated between line and earth terminals.
Do not touch any live parts in the circuit during the measurements.
● When making MΩ test, make sure all power is disconnected in the circuit to be
measured.
6-2. Battery Check
When the battery voltage falls below a specified voltage value, “B” mark will appear
on the display. If this occurs during the measurement, replace all batteries to new
ones as soon as possible.
① To verify the battery charge, set the range selector switch to the highest insulation
resistance test range.
② Connect the tip of line test lead to the alligator clip of earth test lead and press
MEASURE MΩ test switch. If the batteries become exhausted, “B” mark will
appear on the display.
△
!
WARNlNG
● When MEASURE MΩ test switch is pressed during the battery check, a high
voltage is being generated between line and earth test lead.
Do not touch any live parts of the test leads.
6-3. Auto Power Off Function
When a desired range is selected from “OFF” position, the power is turned on
activating the display. If MEASURE MΩ test switch is not pressed within 10
minutes, the automatic power off function will operate to switch the power off
automatically.
To release from this condition, reset the range selector switch again from “OFF”
position or press MEASURE MΩ test switch.
6-4. Measurement of AC Voltage
① Verify the MEASURE MΩ test switch is set to “OFF” position.
② Set the range selector switch to “ACV” range. If the range selector switch is set
to “ACV” position and even MEASURE MΩ test switch is pressed, this tester
works as AC voltage measurement tester.
③ Connect the plugs of line test lead and earth test lead into the line and earth
terminals respectively.
④ Connect the test leads to the circuit under test. If the voltage is applied to the unit,
HV lamp is turned on.
⑤ Read the voltage value in the display after display stabilized.
△
!
WARNlNG
● POSSIBLE ELECTRICAL SHOCK or FIRE HAZARD.
Do not expose the instrument to rain or moisture. Do not operation the
instrument in the presence of flammable gases or fumes.
● To avoid damage to the instrument, disconnect test leads before changing
function.
● Never fail to keep the max. 600V AC input to avoid electrical shock or damage.
● To avoid electrical shock or damage, do not apply any voltage to the
instrument when MEASURE MΩ test switch is set to “ON” position.
Set to OFF
6-5. Insulation Resistance Test
① Set the range selector switch to a desired range appropriate to the circuit to be
measured. (Refer to the section 4. “Insulation resistance measurement”).
② Connect the test leads to line and earth terminals.
③ Connect the tip of line test lead to the alligator clip of earth test lead and press
MEASURE MΩ test switch. Verify zero MΩ is indicated on the display.
④ Connect the test leads to the circuit under test and verify HV lamp is turned off.
⑤ Press MEASURE MΩ test switch and read the insulation resistance value on the
display.
Note: “OL” mark indicate “over load” and “infinity (∞) of insulation resistance value”.
When “OL” mark is displayed, “∞” mark also appears on the upper right
side of LCD.
△
!
WARNlNG
● When MEASURE MΩ test switch is set to “ON” position, a high voltage is being
generated between line and earth terminals.
Do not touch any live parts in the circuit during the measurements.
● When making MΩ test, make sure all power is disconnected in the circuit to be
measured.
● Always make sure HV lamp is turned off before pressing MEASURE MΩ test
switch
6-6. Discharging of Capacitors in The Circuit
After the MΩ test has been done, keep to connect the test leads to the circuit
under test and turn off the MEASURE MΩ test switch. The generation of voltage
output is stopped and the discharging circuit is activated, thus, the charged electric
power in the circuit will be discharged.
To verify the discharging condition, observe the HV lamp.
When discharged, HV lamp is turned off (no voltage condition).
Set to ON
One end of load
is grounded
7. REPLACEMENT OF BATTERIES
Before changing batteries, remove all electrical input and set the range selector switch
to “OFF” position. To replace batteries, remove the battery cover located on the unit
back. Loosen a screw on the battery cover by flat blade screw driver or coin. Then,
slowly remove the battery cover.
Replace the six batteries (AA size or LR6) with new ones observing polarity.
Use high-quality batteries which are guaranteed against leakage. If the instrument is left
unused for long periods of time, remove the batteries to prevent damage from leakage.
6. REPAIR SERVICE
When requesting for repair service, Please bring the instrument directly to the dealer
where you bought.
When mailing the instrument, always pack it in its original or equivalent packing
materials to avoid any damage during the transportation and also put together with
documents showing your name, address, phone number and defect point.
7. WARRANTY
This instrument is sent out from our factory after the sufficient internal inspections but
if you find any defect due to the fault in our workmanship or the original parts, please
contact the dealer where you bought the instrument.
The warranty period is 12 months from the date of purchase and the instrument shall
be repaired at free of charge, provided that we judge the cause of defect is obviously
resulted from our responsibility.
GUARANTEE REGULATIONS
1. This instrument is warranted for the operation under normal use for 12 months from
the date of purchase.
2. This warranty does not cover the following defects:
a. Defects caused from the improper use and operation.
b. Defect caused from the use, operation and storage beyond the original
specifications, designs and conditions.
c. Defect caused from the renovations or repairs done by someone else than us or
our representatives.
d. Defect not caused from our responsibilities.
Battery compartment cover
Screw
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