AEMC 6503 User Manual

MegohmmeterModels6501/6503 15
4.5 UtilizationoftheGuardTerminal(Model6503)
G
A
D
B
C
A = Insulation
B = Shield
C = Conductor
D = Exposed surface
Figure 4-1
Guardterminalsareusefulwhenmeasuringhighresistancevalues
andforstabilizingreadings.
Whentestingtheinsulationattheendofacable,itisnecessaryto
eliminatetheerrorfromsurfaceleakagewhichoccurs,particularly
athighresistancevalues.Thepurposeoftheguardterminalisto
provideathirdterminalwithinthepathofthesurfaceleakage“D”.
ConnecttheinstrumentasshowninFigure4-1.
Ifthereisnoshieldat“B”,useacopperwirewoundseveraltimes
aroundtheexposedsurface“B”.(Note:Ifashieldisnotavailable
and you do not make up a shield around “B” and connect to the
guardterminal(-),themeasurementwillbeerroneousandleadto
confusionastothecable’sstate.)
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AEMC 6503 Specifications

General

Brand	AEMC
Model	6503
Category	Measuring Instruments
Language	English