Extech Instruments 382357 Specifications download pdf (Page 7)

382357‐EU‐ENV2.42/13

MeasurementPrinciples

Typicalmulti‐groundeddistributionsystem



Iftheparallelgroundresistances,

,R

,etc,uptoR

arecombined

asR

,thenonlyR

andR

are

leftinthecircuit



Ifaconstantvoltageisappliedtothecircuit,thefollowingequationapplies:

eqg



where:

,...2,1,









IfR

andR

,R

…R

,areapproximatelythesame,andnislarge(200,forexample),thenR



willbemuchlessthenR

andmaypossiblyapproachzero.

Example:

IfR

andR

,R

…R

areall10respectivelyandn=200,thenR

bycalculationequals:





 05.0

...



geqg

RRR

 05.1005.010 

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Extech Instruments 382357 Specifications Page 7

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