Extech Instruments MG310 User manual

USER MANUAL

InsulationResistanceTester

WithContinuityandACVoltagemodes

ModelMG310

2 MG310-en-GB_V1.0 12/15

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.



3 MG310-en-GB_V1.0 12/15



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



4 MG310-en-GB_V1.0 12/15

MeterDescription

123

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).

5 MG310-en-GB_V1.0 12/15

1234567

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.

6 MG310-en-GB_V1.0 12/15

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.

7 MG310-en-GB_V1.0 12/15

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

8 MG310-en-GB_V1.0 12/15

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.

Table of contents

Other Extech Instruments Measuring Instrument manuals

Extech Instruments

Extech Instruments 407860 User manual

Extech Instruments

Extech Instruments UM200-NIST User manual

Extech Instruments

Extech Instruments MA430T User manual

Extech Instruments

Extech Instruments MN30 User manual

Extech Instruments

Extech Instruments 38394 User manual

Extech Instruments

Extech Instruments 407790A User manual

Extech Instruments

Extech Instruments AN100 User manual

Extech Instruments

Extech Instruments 45168CP User manual

Extech Instruments

Extech Instruments 380942 User manual

Extech Instruments

Extech Instruments 250W Series User manual

Extech Instruments

Extech Instruments MO270 User manual

Extech Instruments

Extech Instruments GRT300 User manual

Extech Instruments

Extech Instruments AN250W User manual

Extech Instruments

Extech Instruments 407123 User manual

Extech Instruments

Extech Instruments RH390-NIST User manual

Extech Instruments

Extech Instruments 461893 User manual

Extech Instruments

Extech Instruments PH220 User manual

Extech Instruments

Extech Instruments AN100-NIST User manual

Extech Instruments

Extech Instruments 421509 User manual

Extech Instruments

Extech Instruments PH100 User manual

Extech Instruments

Extech Instruments MA3010 User manual

Extech Instruments

Extech Instruments 380363 User manual

Extech Instruments

Extech Instruments 407119-NIST User manual

Extech Instruments

Extech Instruments MA160 User manual

Popular Measuring Instrument manuals by other brands

Suaoki

Suaoki D40 user manual

Elster

Elster BK-G1.6 operating instructions

Endress+Hauser

Endress+Hauser Deltabar FMD71 technical information

Duratool

Duratool D03128 manual

Vega

Vega VEGAPULS 65 Quick setup guide

Tonghui

Tonghui TH2618B Operation manual

Tenmars

Tenmars TM-801 user manual

MSR

MSR 145 user manual

TPS

TPS WP-82 manual

ELMETRON

ELMETRON CP-511 user manual

PCB Piezotronics

PCB Piezotronics 003C30 Installation and operating manual

Tenma

Tenma 72-10465 manual

Endress+Hauser

Endress+Hauser Proline Promag 50 Brief operating instructions

Siemens

Siemens SITRANS F Coriolis FCT030 Function manual

KLINGER

KLINGER CMF V Series instruction manual

EXFO

EXFO FTB-2 Notice

Keysight

Keysight M8290A Getting started guide

ADTEK

ADTEK MW-5 operating manual