Amprobe DGC-1000A Manuale d'uso - Pagina 15

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1. Ground Resistance Measurement

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circuit is shown in Figure A. If R

then only R

and R

are left in the circuit (refer to Figure B). If a

constant voltage is applied to the circuit, the following equation will be

derived.

where

If R

and R

, R

, ... R

are about the same, and n is a large number

(such as 200), then R

zero.

Example:

If R

and R

, R

, ... R

are all 10  , respectively and n = 200. Then R

by calculation equals



e q





In this example, we can see that as long as the number of multiple

electrodes is large enough, the equivalent resistance is negligible with

respect to the ground resistance to be measured.

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, R

, ... R

are combined as R







Req

, i 1, 2, ......, n



will be much less than R

and maybe approach

(Req → 0)

>> R



0 05



 

...



10 0.05 10.05





 

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