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26
2.4 Measurement Procedure
Resistance Measurement
Measuring Principle
As illustrated below, the instrument is designed to measure
grounding resistance at multiple grounding locations. (*For appli-
cations involving the measurement of grounding resistance at a
single grounding site, use Hioki's 3151 EARTH HiTESTER.)
If the grounding resistance of the measurement target is repre-
sented by R
x
grounded locations are represented by R
tance value measured by the product is as follows:
R m
=
R x
If n is sufficiently large and each Ri value is sufficiently small,
1
and the second term can be ignored, allowing the value of
R x
»
------------------
n
∑
1
R
to be measured.
---- -
x
R i
i
=
1
R
x
and the grounding resistance values of other
1
+
----------------- -
n
∑
1
---- -
R i
i
=
1
R
1
, R
1
2
R
2
, ..., R
, the resis-
n
R
n
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