Extech Instruments MG310 User manual

USER MANUAL

InsulationResistanceTester

WithContinuityandACVoltagemodes

ModelMG310

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Introduction

ThankyouforselectingtheMG310InsulationResistanceTester.Thismetermeasuresinsulation

resistance,continuity,andACVoltage.TheMG310isCATIII600VACandidealformeasuring

insulatingmaterialsandelectricalequipmentsuchastransformers,cables,switches,and

appliances.Applicationsincludemaintenance,testing,andinspection.Properuseandcareofthis

meterwillprovidemanyyearsofreliableservice.



Safety

ThistesterisdesignedandmanufacturedincompliancewiththeIEC61010standard.Thisuser

manualincludesdetailedinformationrelatedtothesafeoperationandcareofthisinstrument.

Pleasereadcarefullybeforeusingtheinstrument.

Pleasereadandunderstandthisusermanualbeforeusingthedevice.

Alwaysusethedeviceasspecifiedintheusermanual,retainthemanualforfutureuseand

checkthewww.extech.comwebsitefornewerversionsoftheusermanual.

Misuseofthisdevicemaycausepersonalinjuryanddamagetotheinstrumentand

connectedequipment.

Thissymbolontheinstrumentindicatesthatforsafeoperationtheusermustusethe

instrumentasdescribedintheusermanual.

Dangericons:Alerttoconditionsandactionsthatmaycauseseriousorfatalinjury.

Warningicons:Alerttheusertothepotentialofelectricshock.

Cautionicons:Alerttoconditionsandactionsthatmaycausedamagetotheinstrumentor

thatmayaffecttheinstrumentaccuracy.



Danger

Donotmeasurecircuitswithvoltagesgreaterthan750VAC.

Donotusethisinstrumentinareaswhereflammableconditionsexist.

Donotusethisinstrumentinareasofhighhumidity.Donotoperatethisinstrumentwith

wethands.

Donottouchconductivesectionsofthetestleadswhentakingmeasurements.

WhentestleadsareshortedandconnectedtotheinstrumentsdonotpresstheTESTbutton.

Donotopenthebatterycoverduringtests.

Donottouchthetestedcircuitsorwiresduringinsulationmeasurements.



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

Warning

Iftheinstrumentexhibitsfaultyoperationpleasediscontinueuseandhavetheinstrument

serviced.

Beextremelycarefulwhentheinstrumentsismeasuringvoltagesthatexceed33VACrms,

46.7VACrms,or70VDC;electricalshockispossible.

Whenhighresistancemeasurementsareconducted,strayelectricalincircuitsundertest

mustbedischarged.

Donotreplacethebatterieswhentheinstrumentiswet.

Ensuresecureconnectionswiththetestleadsandtheinstrument’stestleadterminals.

Shuttheinstrumentdownbeforeopeningthebatterycompartment.



Caution

Circuitsundertestmustbecompletelydischargedandisolatedfrompowercircuitsbefore

takingresistancemeasurements.

Ifthetestleadsoradaptorsneedtobereplacedduetodamage,replacewithtestleadsor

adaptorsofthesamemodelorelectricalspecifications.

Donotusetheinstrumentiflowbatteryindicatorshowsthelowbatteryindicator.Ifthe

instrumentwillnotbeusedforalongperiod,pleaseremovethebatteryandstoresafely.

Donotstoreoroperatetheinstrumentinareasofhightemperature,highhumidity,flameor

explosivepotentials,orwherestrongelectromagneticfieldsexist.

Cleantheinstrumenthousingwithadampclothandmildcleaningagent;donotuse

abrasivesorsolvents.

Iftheinstrumentiswet,pleasedrybeforestoring.



ElectricalSafetySymbols



Riskofelectricalshock



Doubleinsulationorreinforcedinsulation

ACMeasurement



Ground



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MeterDescription

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678 9



1. EARTHterminalforInsulationResistanceandContinuitytesting.

2. GUARDterminalforACVandContinuitytesting.

3. VterminalforACVtestingandSelf‐Testmode.

4. LINETerminalforInsulationResistancetestingandSelf‐Testmode.

5. BacklitLCDDisplay

6. ZERObutton(shortpress)andLCDBacklightON/OFFbutton(longpress)

7. PI/DARTestingselectionbutton

8. TESTbutton

9. Rotaryfunctionselectswitch



Note:Securebatterycompartmentlocatedonrearofunit.



ControlButtons



1. PI/DARbutton:PresstoselectPIpolarizationindexandDARdielectricabsorptionratiotest

modes.

2. ZERO/Backlightbutton:Longpresstoenable/disableLCDbacklightorshortpresstoresetthe

displaytozeroforlowresistancemeasurements.

3. TESTbutton:Engage/disengagetestingforIR,Continuity,andACVoltagetests.

4. Rotaryfunctionswitch:SelectanIRoutputtestvoltage(250V/500V/1000V),measurelow

resistance(Continuity),ormeasureACVoltage(ACV).

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101112

DisplayDescription

1. Batterystrengthindicator

2. DC/ACVoltagemodes

3. Voltagepresentalert

4. PItestmode

5. DARtestmode

6. Time1forPI/DARtests

7. Time2forPI/DARtests

8. PI/DARTesttimer(minutesandseconds)

9. Testvoltageoutput[V]

10. Units[G:Gigaohm;M:Megaohm]andVoltage[V]andResistance[Ω]modesymbols

11. Mainmeasurementdisplay

12. ZEROfunction

13. UnderRange<

14. OverRange>

15. Audiblecontinuityalertbeeper

OperatingInstructions

WARNING:Riskofelectrocution.High‐voltagecircuits,bothACandDC,areverydangerousand

shouldbemeasuredwithgreatcare.

1. ALWAYSturnthefunctionswitchtotheOFFpositionwhenthemeterisnotinuse.

2. If“OL”appearsinthedisplayduringameasurement,thevalueexceedsthemeter’srange.

3. Ifthebatteriesareweakreplacethembeforeperformingtests.Thebatteryindicatoronthe

upperleftalertstheuserwhenbatterypowerislow.Thebatterycompartmentisaccessed

throughthebackofthemetersecuredbyonePhillipsheadscrew.

DISPLAYBACKLIGHT

Pressandholdthebacklightbuttonfor2secondstoswitchthebacklightonoroff.Forbest

batteryefficiencyusethebacklightonlywhenneeded.

HOLD

Theautomaticholdfunctionfreezestheinsulationresistancereadinginthedisplayforashort

periodoftimeforconvenience.



LOWBATTERYINDICATION

Whenthe iconappearsinthedisplay,thebatteriesshouldbereplaced.Refertothebattery

replacementsectionofthisusermanual.

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INSULATIONRESISTANCEMEASUREMENTS



1. Selectthedesiredtestvoltageusingtherotaryfunctionswitch.Selectthe250V,500V,or

1000Vswitchpositionforthecorrespondingoutputtestvoltage.

2. Connecttheredtestleadtothemeter’sLINE(4)jackandtheblacktestleadtotheEARTH

(1)jack.Connecttheprobeendofthetestleadstothecircuitundertest.

3. PresstheTESTbuttontotest.The

buttonwillself‐lockandthebutton

lampwilllight.

Note:Ifthecircuitundertestislive

andhasavoltagepotential(AC/DC)

over30V,themeterwillnottest(the

displaywillshowthe“>”iconand

thesymbolwillflash;thebuzzer

willalsosound).Ifthecircuitunder

testisnotliveorifitsvoltageisless

than30V,themeterwillbegin

applyinghigh‐voltagetothecircuit

undertest.

4. Theprimarydisplaywillshowthe

insulationresistanceinMΩ

(megaohms)orGΩ(gigaohms).

5. Thetestvoltage(VDC)valuewillbe

indicatedintheright‐mostauxiliary

display,thesymbolwillflashandthecautionbuzzerwillsound.

6. PresstoreleasetheTESTbuttontostopthetest.Thehighvoltagewillswitchoffandthe

resistancevalueindicatedintheprimarydisplaywillhold.

7. Subsequently,themeterwillinternallydischargethebalanceoftheinsulationtestvoltage.

Note:Turningthefunctionswitchtoanothertestpositionwillabortthetest.

8. Areadingof>5.50GΩindicatesthatthemeterreadingisabovetheresistancethresholdof

thatmeasurementrange.

CAUTION

Beforetakingmeasurementsdisconnecttheunitundertestfromallpowersourcesandisolateit

fromanystrayresistance.

Donotshortcircuitthetestleadswhenvoltageisoutputfromthemeter.

Allowsufficienttimebetweentestsfordevicesundertesttostabilize.

Whenredandblackclipsareconnectedtothecircuitundertest,highvoltageisoutputfromthe

LINEjackandcurrentfromtheEARTHjack.

Atthecompletionofatest,donottouchanypartsofthecircuitundertest.Componentsmayhave

becomechargedduringthetestandcoulddischargewhentouched.

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POLARIZATIONINDEX(PI)TESTING

ReadandunderstandalloperationsandsafetyinformationcontainedintheInsulationResistance

(IR)measurementsectionaboveandtheSafetysectionbeforecontinuing.

1. Connectthemetertothedeviceundertestasshowninthetestsectionabove.

2. Selectthedesiredoutputtestvoltageusingtherotaryfunctionswitch(250/500/1000V).

3. UsethePI/DARbuttontoaccessthePItestmode.

4. ThedisplaywillshowthePIiconwhenthePImodeissuccessfullyaccessed.

5. Thetwotesttimes(Time1andTime2)willalternatelyshowontheupperright.

6. Thefirsttestwillrunfor1minute(Time1)whentheTESTbuttonispressed.Ifthetestfails

(noisdisplayed)thesecondtestwillnotautomaticallyrunandtestingisnowcomplete.If

thetestpasses(YESisdisplayed)theTime2testwillrunfor10minutes.

7. Thetestresultwilldisplayafterthe10‐minuteTime2interval

8. PresstheTESTbuttontostopthetestandtobegindischargingthedeviceundertest.



DIELECTRICABSORPTIONRATIO(DAR)TESTING

ReadandunderstandalloperationsandsafetyinformationintheInsulationResistance(IR)

measurementsectionaboveandintheSafetysectionbeforecontinuing.

1. ConnectthemetertothedeviceundertestasshownintheIRtestsectionabove.

2. Selectthedesiredoutputtestvoltageusingtherotaryfunctionswitch(250/500/1000V).

3. UsethePI/DARbuttontoaccesstheDARtestmode.

4. ThedisplaywillshowtheDARiconwhentheDARmodeissuccessfullyaccessed.

5. Thefirsttwotesttimes(Time1andTime2)willalternatelyshowontheupperright.

6. Thefirsttestwillrunfor30seconds(Time1)whentheTESTbuttonispressed.Ifthetest

fails(noisdisplayed)thesecondtestwillnotautomaticallyrunandtestingisnowcomplete.

Ifthetestpasses(YESisdisplayed)theTime2testwillrunfor1minute.Thetestresultwill

displayafterthe1‐minuteTime2interval

7. ToaccessthesecondsetofTime1andTime2testspresstheDARbuttonthreetimesand

repeatthesamestepsaboveinthissection.Forthe2ndsetofteststhetimesare15

seconds(Time1)and1minute(Time2).

8. WhencompletedpresstheTESTbuttontostopthetestandtobegindischarging

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ACCURACYSELF‐TESTFUNCTION

TheMG310featuresa10MΩaccuracycheck

featurefortheInsulationResistancemode.

Toverifytheaccuracy:

1. Connectawirejumpertothemeter

betweentheLINE(4)andV(3)

terminalsasshowninthe

accompanyingillustration.

2. Selectoneofthethreetestvoltage

(250/500/100V)switchpositions.

3. PresstheTESTbuttontobeginthetest.

4. Whentestingiscomplete,themeter

willdisplay10.0MΩ(±0.1MΩ).Ifthe

meterdoesnotshowanaccurate

readingpleasehaveitserviced.

LOWRESISTANCECONTINUITYTESTING

WARNING: To avoid electric shock, never measure continuity on circuits or wires that have

voltage on them.

1. Setthefunctionswitchtothe

(continuity)position.

2. Inserttheblacktestleadbananaplug

intotheGUARD(2)jack.

Inserttheredtestleadbananapluginto

theEARTH(1)jack.

3. PresstheTESTbutton.Thebuttonlamp

willlightindicatingthattestingcan

begin.

4. Touchthetestprobetipstothecircuit

orwireyouwishtocheck.

5. Iftheresistanceislessthan

approximately20Ω,theaudiblesignal

willsoundandtheaudioiconwillbe

displayed.Ifthecircuitisopen,the

displaywillindicate>220Ω.

6. PresstheTESTbuttonagaintodisengagethetestmode(thelampwillswitchoff)before

removingthetestleadsfromthecircuitundertestandfromthemeter.

9 MG310-en-GB_V1.0 12/15

ACVOLTAGEMEASUREMENTS

WARNING:RiskofElectrocution.Theprobetipsmaynotbelongenoughtocontactthelivepartsinside

some240Voutletsforappliancesbecausethecontactsarerecesseddeepintheoutlets.Asaresult,the

readingmayshow0voltswhentheoutletactuallyhasvoltageonit.Makesuretheprobetipsaretouching

themetalcontactsinsidetheoutletbeforeassumingthatnovoltageispresent.

CAUTION:

DonotmeasureACvoltagesifamotoronthecircuitisbeingswitchedONorOFF.Largevoltagesurges

mayoccurthatcandamagethemeter.

Donotmeasurevoltagehigherthan750VAC.

Pleaseuseextremecautiontoavoidhighvoltageelectricalshockwhileoperatingthisinstrument.

Disconnecttestleadsfromtestedcircuitsandmeterterminalsaftertesting.

1. SetthefunctionswitchtotheV(ACV)position.

2. InserttheblacktestleadbananaplugintotheGUARDjack(2).

InsertredtestleadbananaplugintotheVjack(3).

3. PresstheTESTbuttontoengagethetestingmode(thebuttonlampwilllight).

4. Touchtheblacktestprobetiptotheonesideofthecircuit.

Touchtheredtestprobetiptotheothersideofthecircuit.

5. Readthevoltageinthemaindisplay.

6. PresstheTESTbuttonagaintodisengagethetestmode(thelampwillswitchoff)before

removingthetestleadsfromthecircuitundertestandfromthemeter.

10 MG310-en-GB_V1.0 12/15

Maintenance

WARNING:Toavoidelectricshock,disconnectthetestleadsfromanysourceofvoltagebeforeremoving

thebackcoverorthebatteryorfusecovers.



WARNING:Toavoidelectricshock,donotoperatethemeteruntilthebatterycoverisinplaceand

fastenedsecurely.

Thisinstrumentisdesignedtoprovideyearsofdependableservice,ifthefollowingcare

instructionsareperformed:

1. KEEPTHEMETERDRY.Ifitgetswet,wipeitoff.

2. USEANDSTORETHEMETERINNORMALTEMPERATURES.Temperatureextremescan

shortenthelifeoftheelectronicpartsanddistortormeltplasticparts.

3. HANDLETHEMETERGENTLYANDCAREFULLY.Droppingitcandamagetheelectronicpartsor

thecase.

4. KEEPTHEMETERCLEAN.Wipethecaseoccasionallywithadampcloth.DONOTusechemicals,

cleaningsolvents,ordetergents.

5. USEONLYFRESHBATTERIESOFTHERECOMMENDEDSIZEANDTYPE.Removeoldorweak

batteriessotheydonotleakanddamagetheunit.

6. IFTHEMETERISTOBESTOREDFORALONGPERIODOFTIME,thebatteriesshouldbe

removedtopreventdamagetotheunit.



BATTERYINSTALLATION

WARNING:Toavoidelectricshock,disconnectthetestleadsfromanysourceofvoltagebefore

removingthebatterycover.

1. Turnpoweroffanddisconnectthetestleadsfromthe

meter.

2. Opentherearbatterycoverbyremovingthescrewusinga

Phillipsheadscrewdriver.

3. Insertthe6x1.5V‘AA’batteriesintothebatteryholder,

observingcorrectpolarity.

4. Putthebatterycoverbackinplace.Securewiththescrew.



You,astheenduser,arelegallybound(EUBattery

ordinance)toreturnallusedbatteries;disposalinthe

householdgarbageisprohibited!Disposeofusedbatteries/accumulatorsatcollectionpointsin

yourcommunityorwhereverbatteries/accumulatorsaresold!

Disposal:Followthevalidlegalstipulationsinrespectofthedisposalofthedeviceattheendof

itslifecycle

WARNING:Toavoidelectricshock,donotoperatethemeteruntilthebatterycoverisinplace

andfastenedsecurely.

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