Extech Instruments MG500 Manual

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MG500-EU-EN v1.0 7/13

Operation

Poweringthemeter

PresstheONbuttontoturntheuniton.Pressthe OFFbuttontoturntheunitoff.Ifthemeter

doesnotswitchONpleasecheckthatfresh‘C’1.5Valkalinebatteriesareinstalledinthebattery

compartmentlocatedatthebottomoftheinstrument.



InsulationResistanceTestingProcedure



Warning:Thecircuitundertestmustbecompletelyde‐energizedandisolatedbeforemaking

testconnections.



1. Afterturningtheuniton,makesurethattheReplaceBatterymessageisnotdisplayed.If

theReplaceBatterymessageisdisplayedreplacethebatteriesbeforeproceeding.

2. Thetestvoltagedefaultsto

2500Vonpowerup.Selectthedesiredtestvoltageusingthe

Voltage Adjust buttons (±500V) that step through the available test voltages in 500V

incrementsorbypressingoneofthepresettestvoltagebuttons(10kV,5kV,2.5kV,1Kv).

3. ThedisplayshowstheConnectLeadspromptalongwiththeselected

testvoltagevalue.

ConnecttheGreentestleadtotheGreentestsocketonthemeterandthentotheGround

sideoftheinsulatorundertest.

ConnecttheRedleadtotheRedtestsocketonthemeterandtheBlueguardcabletothe

bluesocketonthe

meter.ConnecttheserviceendoftheRedcabletoothersideofthe

insulatorundertest.

IfaLeakageGuardleadisrequiretocollectsurfaceleakage,connecttheseparateBluetest

leadinto theBlue guardleadfromthe Redtest leadwhich ispluggedintothe Bluetest



socketonthemeterandthencliptheserviceendofthecabletothesurfaceoftheinsulator

undertest.

4. MomentarilyPresstheTESTSTART/STOPbuttontostarttesting.

ForDARorPItesting–refertotheseparatetestprocedurebelow.

5. The Insulation resistance test will

complete in 10 seconds.The  test voltage percentage

steadilycountsdowntozeroduringthetestascanbeseenonthedisplay.Theresistance

testresultvaluewillappearonthedisplaywhenthetesthascompleted.

6. TheHOLDiconwillappearinplaceofthebargraphwhenthe

testiscompleteandafterthe

voltagehasbeendischarged.

WARNING:DONOTREMOVETHETESTLEADSBEFORETHEHOLDDISPLAYAPPEARS.

7. Themeterautomaticallydischargesthesystemattheendofthetest.

8. Totakeanothertest,presstheTESTSTART/STOPbutton,theConnectLeadspromptshould

appearonthedisplay;theinstrumentisnowreadytorunanewtest.

9. Theinstrumentautomaticallypowersdownafter5minutesofinactivity.