Sanwa MG1000, Instructions, Page: 1 / 2

MG1000/MG500/MG125
INSULATION RESISTANCE TESTER
②07.08 獗
[1] SAFETY PRECAUTIONS
Before use, read the following safety precautions.
Thank you for purchasing the Sanwa MG1000/MG500/MG125 digital insulation
resistance tester. Before use, please read this manual thoroughly to ensure
correct and safe use. Keep this Instruction Manual together with the product.
Be sure to read the information under “ WARNING” that is intended to prevent
personal injury such as burn and electric shock and other serious accidents.
1-1 Explanation of Warning Symbols
The meaning of the symbols used in this manual and attached to the product is
as follows:
: Very important instructions for safe use
• The warning messages are intended to prevent accidents to operating
personnel such as burn and electric shock.
• The caution messages are intended to prevent incorrect handling and
measurement which may damage the product.
: Dangerous voltages
: Ground.
: DC. : AC.
: Fuse. : Double or enhanced insulation.
1-2 Warning Messages for Safe Use
WARNING
The following instructions are intended to prevent personal injury such as burn and
electric shock. Be sure to follow them when using the tester:
INSTRUCTIONS
1-3 Overload protection
The maximum rated input value and overload protection have been defined for
the input terminals of each function as shown below.
Function Max. Rated Input Overload Protection
M Ω - M Ω range: Within 120% of the rated measuring voltage.
V 600Vrms 780Vrms
4000 Ω - 600Vrms
40 Ω - Fuse, 0.5 A/600 V
Overvoltage measurement categories
Overvoltage measurement category I (CAT. I ) :
Line on the secondary side on the inside of equipment via a transformer, etc.
from the receptacle.
Overvoltage measurement category II (CAT. II ) :
Line on the primary side of equipment with power cord to be connected to the
receptacle.
Overvoltage measurement category III (CAT. III ) :
Line from the primary side or branch of equipment which directly takes in
electricity from a distribution board to the receptacle.
Overvoltage measurement category IV (CAT. IV ) :
Line from the service conductor to the distribution board.
[2] APPLICATIONS AND FEATURES
2-1 Applications
This instrument is a DC insulation resistance tester for use in measurement of
insulation resistance of a power line and power equipment within the range of
600 V under CAT III.
2-2 Features
• Safety design in compliance with IEC61010-1
• M
Ω function with automatic live circuit detection (>30V AC/DC)
• Easy-to-read display showing large figures and log bar graph for reading in an
analog feeling
• Automatic hold function to hold the last displayed value to look it safely after
measurement
• LCD panel with backlight function
• Auto discharge function
• 40.00
Ω measurement function ( ≧ 200 mA short circuit current)
[3] NAMES AND FUNCTIONS OF COMPONENT UNITS
WARNING
1. Never use the tester on a high-power or high-voltage line.
2. Voltages above 70 VDC or 33 Vrms AC (46.7 V peak) are hazardous to
human body. Never touch them.
3. Disconnect circuit power before testing insulation resistance.
4. Use caution with the high voltages output when performing insulation
resistance measurement to avoid electric shock.
5. To prevent electric shock, always discharge capacitive circuits after the
insulation resistance measurement.
6. Never input signals exceeding the maximum rated input value (see 1-3).
7. Never use the tester for measuring voltages of lines connected to
equipment (e.g. motors) that generates induced or surge voltage since it
may exceed the maximum allowable overload input.
8. Never use the tester if the tester or test leads are damaged or broken.
9. Never use the tester with the rear-case or battery lid removed.
10. When using the test leads, keep your fingers behind the finger guards.
11. During measurement, do not change the function or range nor replace the
plugs.
12. Never use the tester when it is wet or with wet hands.
13. Be sure to use the fuse of the specified rating and specification.
14. Do not touch the metallic part of the alligator clip connected to grounding
side as voltage is present.
15. When connecting the alligator clip, connect it to the grounding side of the
object to be measured first. When disconnecting it, disconnect the test
lead from the line first, and then disconnect the teat lead from the
grounding side of the measured object.
16. Never attempt repair or modification, except for battery and fuse replacement.
17. Inspect the tester at least once a year.
18. This tester is for indoor use only.
19. Never use the tester near equipment that generates strong
electromagnetic waves or is charged.
CAUTION
1. The measuring terminals output high voltages during insulation resistance
measurement.
To prevent damaging the tester and parts (including chips) with low or unknown
withstanding voltages, connected to the measured electrical path (circuit), it is
recommended to disconnect them from the electrical path before
measurement. This care is specially important with computer equipment.
2. The rated measuring voltage used in insulation resistance measurement
should be as close as possible to the operating voltage of the circuitry to
measure. For example, when measuring an electrical path of 100 V, it is
recommended to use a tester with a rated measuring voltage of 125 V.
Instrument body LCD panel
Test lead (TL-112)
Strap (ST-50)
When pressed for more than 2 seconds, continuous
test voltage is output and indication appears. To
release the lock, press the LOCK or MEASURE button,
the test voltage output is stopped, the circuit under test
is discharged automatically, and the last displayed
value appears on the display together with the
indication.
40
Ω measurement function:
When pressed for more than 2 seconds,
indication appears and the tester continues measuring.
To release the lock, press the LOCK or MEASURE
button. The measurement is stopped and the last
displayed value appears on the display together with
the
indication.
Turns backlight on/off. The backlight goes off
automatically after 10 seconds.
Zero Ohm adjustment for 40 Ω measurement function
or when selecting the maximum M Ω measurement
function.
Turns the tester ON/OFF or to select a function. The
body cover cannot be closed unless this switch is set to
the OFF position.
Lights up in M Ω measurement function. It blinks when
the test voltage drops below rated value.
Lights up when the input is about 30 V AC/DC or more.
It can be used as the live circuit detection, etc.
Space to store the test leads and alligator clips.
To attach a strap.
Numeral and decimal point
AC voltage operation indicator
Negative value indicator
M Ω measurement function:
Lights up when the tester outputs test voltage.
Lights up when the object to be measured is charged
about 30 V or more.
V measurement function:
Lights up when the input is 600 Vrms or more.
DC voltage operation indicator.
Auto Power Save mode indicator
The tester enters “power save mode” automatically if it
has not been operated for about 30 minutes. The tester
come out of “power save mode” when power/function
switch is turned to OFF once and set to the required
function again.
To cancel Auto Power Save function, turn the
power/function switch from OFF position to any desired
function while holding the LIGHT button pressed.
*A small electric current from power supply is present
in Auto Power Save mode. Be sure to set the
power/function switch to “OFF” after measurement.
Data Hold indicator
Test lock (continuous test voltage output) indicator
0 Ω adjustment indicator
Low battery warning indicator:
Appears when the internal batteries are exhausted (to
about 7.2 V or less). When the indicator appears or
blinks, replace the batteries with new ones.
Unit indicators.
Logarithmic bargraph
Disabled in the 40
Ω measurement function
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LOCK button
LIGHT button
0 Ω ADJ button
Power/function
switch
RATING VOLTAGE
indicator
ALARM indicator
Test lead storage space
Strap hook
4-2 Measurement Range and Accuracy
Temperature 23 ± 5
°
C, humidity 45% to 75% RH.
rdg: Reading. dgt: Digits
4-2-1 Insulation resistance measurement functions (k Ω , M Ω )
Model:MG1000
Model:MG500
Nominal test voltage &
Measurement Range
250V
4.000M Ω /40.00M Ω
400.0M Ω /4000M Ω
500V
4.000M Ω /40.00M Ω
400.0M Ω /4000M Ω
Center
scale
10M Ω
1st effective
measurement range
0.5 〜 20.00M Ω ± (3%rdg+4dgt)
2nd effective
measurement range
1st effective
measurement range
2nd effective
measurement range
1st effective
measurement range
2nd effective
measurement range
0 〜 0.49M Ω
20.01 〜 4000M Ω
± (5%rdg+5dgt)
100M Ω
1.000 〜 500M Ω ± (3%rdg+4dgt)
0 〜 0.999M Ω
501 〜 4000M Ω
± (5%rdg+5dgt)
1000V
4.000M Ω /40.00M Ω
400.0M Ω /4000M Ω
100M
Ω
2.000 〜 1000M Ω ± (3%rdg+4dgt)
0 〜 1.999M Ω
1001 〜 4000M Ω
± (5%rdg+5dgt)
Measurement Range Accuracy
Open circuit voltage 1 to 1.3 times of nominal test voltage
Rated measurement current 1.0-1.2 mA (250 V @0.25 M Ω , 500 V @0.5 M Ω , 1000 V @1 M Ω )
Short-circuit current 2mA or less
Live circuit detection At ≧ 30V AC/DC or more, inhibits test, buzzer sounds and
ALARM indicator lights up.
Nominal test voltage &
Measurement Range Center
scale
10M
Ω
1st effective
measurement range
± (3%rdg+4dgt)
2nd effective
measurement range
1st effective
measurement range
2nd effective
measurement range
1st effective
measurement range
2nd effective
measurement range
± (5%rdg+5dgt)
100M Ω
± (3%rdg+4dgt)
± (5%rdg+5dgt)
100M Ω
± (3%rdg+4dgt)
±
(5%rdg+5dgt)
Measurement Range Accuracy
Open circuit voltage 1 to 1.3 times of nominal test voltage
Rated measurement current 1.0-1.2 mA (125 V @0.125 M Ω , 250 V @0.25 M Ω , 500 V @0.5 M Ω )
Short-circuit current 2mA or less
Live circuit detection At ≧ 30V AC/DC or more, inhibits test, buzzer sounds and
ALARM indicator lights up.
125V
400.0k
Ω
4.000M Ω /40.00M Ω
400.0M Ω /4000M Ω
250V
400.0k Ω
4.000M Ω /40.00M Ω
400.0M Ω /4000M Ω
20.0k Ω 〜 10.00M Ω
0 〜 19.9k Ω
10.01 〜 4000M Ω
50.0k Ω 〜 20.00M Ω
0 〜 49.9k Ω
20.01 〜 4000M Ω
500V
400.0k Ω
4.000M Ω /40.00M Ω
400.0M Ω /4000M Ω
1 〜 500M Ω
0 〜 0.999M Ω
501 〜 4000M Ω
Model:MG125
Nominal test voltage &
Measurement Range Center
scale
1M Ω
1st effective
measurement range
± (3%rdg+4dgt)
2nd effective
measurement range
1st effective
measurement range
2nd effective
measurement range
1st effective
measurement range
2nd effective
measurement range
± (5%rdg+5dgt)
1M Ω
± (3%rdg+4dgt)
± (5%rdg+5dgt)
1M Ω
± (3%rdg+4dgt)
± (5%rdg+5dgt)
Measurement Range Accuracy
Open circuit voltage 1 to 1.3 times of nominal test voltage
Rated measurement current 1.0-1.2 mA (25V@ 0.025M Ω , 50V@0.05M Ω , 125V@0.125M Ω )
Short-circuit current 2mA or less
Live circuit detection At
≧
30V AC/DC or more, inhibits test, buzzer sounds and
ALARM indicator lights up.
[4] SPECIFICATIONS
4-1 General Specifications
Grounding/COM terminal for connecting the black
alligator clip.
Line/+ terminal for connecting the red test lead.
Displays the value, function name or voltage output
status.
M Ω measurement function:
• Press and hold the button to output the test voltage.
When the button is released, the test voltage output
is stopped, the circuit under test is discharged
automatically, and the last displayed value appears
on the display together with the
indication.
• When the button is pressed during continuous test
voltage generation using the LOCK button, the test
voltage is stopped, the last displayed value is held,
and the circuit under test is discharged automatically.
40 Ω measurement function:
• Press and hold the button to start measuring. When
the button is released, the test voltage output is
stopped and the last displayed value is held appears
on the display together with the
indication.
• When the button is pressed during continuous
measurement using the LOCK button, the
measurement is stopped and the last displayed value
is held.
Name Description
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EARTH/COM terminal
LINE/+ terminal
LCD panel
MEASURE button
25V
400.0k Ω /4.000M Ω
40.00M Ω /400.0M Ω
50V
400.0k Ω /4.000M Ω
40.00M Ω /400.0M Ω
10.0k Ω 〜 5.00M Ω
0 〜 9.9k Ω
5.01 〜 400.0M Ω
10.0k Ω 〜 5.00M Ω
0 〜 9.9k Ω
5.01 〜 400.0M Ω
125V
400.0k Ω /4.000M Ω
40.00M Ω /400.0M Ω
20.0k Ω 〜 10.00M Ω
0 〜 19.9k Ω
10.01 〜 400.0M Ω
Note
When the displayed value is 2000 M
Ω
or more, the lowermost digit is fixed at 0.
SANWA ELECTRIC
INSTRUMENT CO., LTD.
Dempa Bldg, 4-4 Sotokanda2-Chome
Chiyoda-ku, Tokyo, Japan
“OL” indication on LCD
V function: 780V or over
M
Ω , 4000 Ω , 40 Ω function: Approx. 4200 count or over
AC Sensing
LCD
Sampling rate
Polarity indication
Low battery indication
Environmental condition
Power supply
Average value
4200 count with log bar graph
Approx. 2 times / sec.
“
−
” indication only when negative input
“ ” lights or flickers at about 7.7V-7.2V or below
Altitude 2000m or below, pollution degree II
Auto only
Range up: approx. 4200 count or over,
Range down: approx. 380 count or below Range selection
Over-range indication
Operating temperature /
humidity
0 ° C to 40 ° C and maximum relative humidity 90%
(No condensation)
Storage temperature /
humidity -10 ° C ~ 50 ° C, 70%RH or below (with battery removed).
R6 1.5V x 6 pcs (MG125, MG500) ; LR6 1.5V x 6 pcs (MG1000)
Dimensions
Weight
Power consumption
Accessories
Optional accessories
170 (L) X 142 (W) X 57 (H)
Approx. 600g (battery included)
Apporox. 7mA at V function
Battery (built-in), test leads (TL-112), Strap (ST-50), instruction manual
Alligator clip CL-16
Safety / EMC
IEC61010-1 CAT.III 600V, IEC61557-1/2/4, IEC61326 (EMC),
IEC60529-IP54, IEC61010-031 (TL-112)
MG125, MG500 : Approx. 5 hours
MG1000 : Approx. 2 hours 30 minutes Time of
measurement
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Test pin
Finger
guard
Plug
No.0436-002AB