LEM A 6403 06311 Manual De Instrucciones página 12

Principle of Operation
If the parallel connection of resistors R1...Rn is considerably lower than the ground
connection under test R X:
1
—————————––––––– << R X
1 1
—— + —— + ... + ——
R1 R2
U
then R X = —— is a reasonable approximation.
I
The test voltage (U) is applied without disconnecting ground rod and/or direct electrical
connection by means of a clamp-on current transformer and the current detected by a
second current transformer.
After synchronous rectification of current and voltage the tester displays R X .
12
1
Rn
Adapter for stakeless ground testing
A640311 GA1 Z REV 1