ETCR ETCR2100A+ - Page 26

-23-
So, if the measurement value of the Meter is smaller than the
allowable value of the grounding resistance, then the two
grounding bodies are qualified for grounding resistance.
(2) Three-Point Method
As shown in the figure below, in the vicinity of the measured
grounding body R
A,
find two independent grounding bodies of
better grounding state R
B
and R
C.
First, link R
A
and R
B
with a test line; use the Meter to get the first
reading R
1
.
Second, have R
B
and R
C
linked up, as shown in the following figure.
Use the Meter to get the second reading R
2
.
Third, have R
C
and R
A
linked up, as shown in the following figure.
Use the Meter to get the third reading R
3
.