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EXTECH MG320 [6/12] Insulation resistance measurements

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.

EXTECH MG320 [6/12] Insulation resistance measurements

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