Icel Manaus MG-3120 User manual

MG-3120
Digital Insulation Resistance T ester
OPERATION MANUAL

Contents
General Introduction ………………………………2
Safety Rules …………………………………………2
PerformanceFeatures ………………………………3
Specification ………………………………………… 4
OperationSchematicView …………………………5
OperationInstruction…………………………………6
Maintenance …………………………………………9
Accessories ………………………………………… 9
Warning
This user manualincludes warning
and safety specifications, which shall be
strictly followed to ensure safety. Please
be sure to read through this user manual
beforeusingthis instrument.
1

I.GeneralIntroduction
The MG-3120 instrument can measure insulation
resistance.
Asanewgenerationallmightyelectricaltest
instrument we have successfully developed recently
,
it has made fundamental changes to the circuit
industry of conventional insulation resistance
. Aided
bytheniceandfashionabledesign, MG-3120 have
more and stronger functions
, are easier to use and
more reliable
. The instrument and accessories are
allinthetoolbox
, fit for field application . It can be
used to test the insulation resistance of power system
,
electrical equipment
, lightning arrester equipment ,
and measure AC voltage and phase sequence test .
II Safety Rules
1. Be sure to read this user manual carefully before
using this instrument.
2. Do not use this instrument when the rear cover is
not in place, or you may get electrical shock.
3. Be sure to check the insulation layer of the probe
issoundandfreeofanydamage beforeusingthis
instrument.
4. Toprevent electrical shock, be sure not to touch
electric lead and circuit when the test is in process.
5. Besuretoconfirmtherangeselectionswitchhas
beensetintheappropriaterangebeforetesting.
6. Confirm theplug of the wire has been tightly
inserted in the terminal.
7. Be sure not to use the instrument when it is moist
8. Besurenottoturnthefunctionselectionswitch
whenthetestisinprocess.
9. DonotapplyanyvoltageACor DC betweentest
terminals.
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10. Do not test in inflammable environment since
sparkmaylead toexplosion.
11. Stop using the instrument in case any metal is
exposedbecause the shellor test wireis broken when
the test is in process.
12. Be sure that the test wire has been removed from
the test terminal and the function range selection
switch is inthe OFF position when youremove therear
cover to replacebattery.
13. Do not replace battery when the instrument is
moist.
14. Be sure to put the function range selection switch
at the OFF position when your work is over.
15. Remember to remove the battery when you are
going to not use the instrument for a long period of
time.
16. When the instrument displays “ ”
, replace
battery promptly
, to ensure the accuracy of
measurement
.
III. Performance Features
1. Low power consuming CMOS dual integralA/D
conversion IC, automatic zero
2. LCD: 3 1/2 bit large screen display, maximum
reading 1999
3. Dataholding function, functionalicons display
4. Can not measure voltage
5. Low Battery indication
6. LCD backlight function
7. Cantestphasesequence
8. Automaticallyconvertrange
( Insulation test only )
9. Perfect protection circuits, which can effectively
prevent the harm of reverse voltage
10. LCD dimension: (65x48)mm (digit is 29mm high
)
11. Power: 8x1.5V (R6 AA) battery

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Model MG-3120
Te s t i n g
Volatge
100 / 250/500/1000/2500 /
5000V
OutVoltage 90%-110% ofthe
test voltage
Range
0.1 M Ω-200 G Ω
Resolution
0.01MΩ
Accuracy
0.1 M Ω-200MΩ ± （3% rdg +5 dgt ）
200M Ω — 10G Ω ± （5% rdg +5 dgt ）
10G Ω — 20 0 G Ω ± （10% rdg +5 dgt ）
12. Dimension: 190x155x75mm
13. Weight: approximately 900g(includingbatteries)
14. The instrument and accessories can be put into
one for easy carriage
15. Environment conditions
16. Operating temperature: 0C~40C
Relativehumidity<80%
Storagetemperature:-10C ~50C
Relativehumidity<80%
IV. Specification
Accuracy: ( %reading+digit ) the warranty is one year
Environment temperature: 23 ℃±5℃
Relativehumidity: <75%
1. Insulation Resistance

5
11
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V. OperationSchematicView
1
3
INSULATION
HV
L1 L2 L3 / G MAX
700V
EL
ACV
L1 L2
L3
PHASE
CW
CCW
D .. H4
5
Te s t
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1. LCD display
10 9
3. Insulation resistance measurement high voltage
LEDindicator
4. Data holding switch
5. Test button
6. Backlight indicator switch
7. Functionswitch
9. LINE input terminal
( Insulation )
10. EARTH input terminal ( Insulation )

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VI. Operation Instruction
1. SafetyPrecautions
①Be careful of the high voltage shock. When the
insulation resistance test is over, be sure to confirm the
high voltage on the object under test has been
discharged.
②Donot touchthe object under test whenthe testis
in process in case you should get electrical shock.
③The object under test shall not be live and be sure
to confirm the object under test is securely earthed
when you test the insulation resistance
. Short circuit
the two test terminals of the object under test to
discharge before you start the test
.
④Do not include any external voltage into the test
loop when you test the insulationresistance.
⑤Be sure to confirm the knob switch is in right
position and the test wire is firmly connected before you
start the test.
⑥Whenthehighvoltageswitchhasbeenturnedon,
upto5000Vhighvoltageisgeneratedbetween L
terminalandEterminal
. Be sure not to touch any
exposedpart ofinstrumentand theobject under test,
otherwise you may getelectrical hazard.

3. Test of Insulation Resistance.
①ConnectionofTestTerminals
Insert the red test lead into the L socket of the
instrument and the plug of the black test lead with
flat crocodile clamp into the E socket of the
instrument
.
②Test connection
The wiring of E socket of the instrument is the earth wire
;
The wiring of L socket of the instrument is the line wire.
The G terminal socket of the instrument is the shield
wire to test the high insulation resistance. If necessary,
insert the plug ofthe black test wire with probe into the
G terminal socket of the instrument, to eliminate the
measurement error caused by the leak current in the
surface of the product, and ensure the accuracy of the
test
;
③SelectionofRatedVoltage
Select the rated voltage you need to test the insulation
resistance by turning the knob to the relevant voltage
class.
④Test Operation
Connecttheother terminal of the wire to the object
under test
. Press the Test / Stop key , the red
indicator turns on
, indicating the high voltage output
of test is connected.
When thetest has started, the LCD of the instrument
displays some readings. The value displayed by LCD is
the insulation resistance of the object under test.
When the high voltage indicator is on, it indicates the
test instrument is working properly.
⑤Turn off
Whenthetestisover
, press the Test / Stop key , the
red indicator turns off
, indicating the test high
voltage has been disconnected
. Put the DIP switch at
OFF position,LCD displays nothing. For capacitive
load,besure to discharge the residual charges in the
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object under test before you remove the test wire , to
prevent the residual charges discharge and harm
people
.
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VII. Maintenance
Thisinstrumentisaprecision electronicinstrument,be
sure to maintain it well.
1. Do not apply the instrument to anyAC/DC
voltage.
2. Do not use the instrument when the rear cover of
the instrument is in place.
3. Toreplace battery, removethe probe and power off
the instrument first. Unscrew the screws of the battery
coverandremovethebatterycover.Besuretoreplace
the battery according tothespecification
requirement.
4. Do not forget to remove the battery if you are not
going to usethe instrument for a long period of time
.
Placethe instrumentata dryand well ventilated
environment.
5. Donot alter any internal circuit of this instrument
at will in case it is damaged.
VIII. Accessories
1. Onecopyofusermanual
2. 1toolbox
3. 2 setsof dedicated test wires(a phasesequence
test wire,aninsulation resistance test wire
4. 8 cells of 1.5VAAbatteries
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