Extech Instruments MG500 User Manual download pdf (Page 13)

MG500-EU-EN v1.0 7/13

InsulatorMeasurementConsiderations

Insulatorsmaygetcontaminatedovertimefromamixtureofdustandmoisture.Dustand

moistureproblemslowertheresistanceofthe insulatorasthisresistanceisinparallelwiththe

insulatorresistance.Itisrecommendedthattheinsulatorbemeasuredfirstwithouttheoptional

guardlead,toverifythatthe

totalresistanceishigh.Shouldthetotalresistancenotbehigh

enough,thecontaminantsshouldberemovedortheinsulatorreplaced.Testthedirtyinsulator

forproperresistancebytestingwiththeoptionalguardlead.Note:Ifcleaningtheinsulatoris

possible,followtheprocedureofthemanufacturer.



DIRTYINSULATOR

ELECTRICALEQUIVALENT

CIRCUITDIRTYINSULATOR TYPICALTEST

Notes:

Resistanceasaresultofcontaminationcanlowerthetotalresistance.

Cleaningperiodicallycanreducesystempowerconsumption.

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Extech Instruments MG500 User Manual Page 13