Extech Instruments MG500 User Manual download pdf (Page 4)

MG500-EU-EN v1.0 7/13

Features

 InsulationResistanceTesting

Thisdigitalinsulationresistancetesterwillmeasureinsulationresistancefrom800kohmsto

500GohmsusingDynamicAuto‐ranging technology.Testvoltagesrangefrom500Vto10kV

in500Voltsteps.ThisinstrumentalsoemploysanAuto‐Dischargeutility.

 DAR:DielectricAbsorptionRatioTesting

The

DielectricAbsorptionistheratiooftheInsulationResistance,measuredat60seconds,

dividedbytheInsulationResistancemeasuredat30seconds).

DAR=Resistancemeasuredat1minute/Resistancemeasuredat30seconds

 PI:PolarizationIndexTesting

ThePolarizationIndexistheratiooftheInsulationResistancemeasured

at10minutes

dividedbytheInsulationResistancemeasuredat1minute.

PI=Resistancemeasuredat10minutes/Resistancemeasuredat1minute

 AutomaticDischargeofCapacitiveandInductiveCircuits

Thisinstrumentwillautomaticallydischargeallcircuits,chargedbythetester,upon

completionofatest.The

dischargecanbeobservedontheinstrument’sbargraphdisplay.

 AutomaticBatteryTest

WhentheinstrumentisfirstpoweredON,atestcircuitappliesaheavycurrentdrawonthe

batteriesforafewsecondsandmeasuresthevoltageinordertodeterminethecapacityof

thebatteries.Theresultis

shownonthedisplay.

 NormalOperationModeConsiderations

 ThisinstrumentusesDynamicCurrentAuto‐rangingtechnology.Thebargraphwill

displaythevoltagethatisstressingtheinsulationduringthefirst30secondsofatestand

duringthedischargeofthecircuitsattheendofthetest.Thedisplaywillalsoshowthe

elapsedtimefromthestartofthetestandthetotaltime,evenafterthetestinghasstopped.

 SupplementalFeatures

o InsulationResistanceauto‐rangingonallVoltageranges

o AutomaticDARcalculation

o AutomaticPIcalculation

o Ener‐Save™Modeconservesbattery

energyduringInsulationResistancetesting

o Overloadprotection

o Lowbatteryindicator

o AutoOfffeature

o Warningofexternalvoltagepresence(>500VACorVDC)

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Extech Instruments MG500 User Manual Page 4