Hioki FT6380 - Resistance Measurement

2.4 Measurement Procedure
26
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
and the grounding resistance values of other
grounded locations are represented by R
1
, R
2
, …, R
n
, the resis-
tance value measured by the product is as follows:
If n is sufficiently large and each R i value is sufficiently small,
and the second term can be ignored, allowing the value of
R
x
to be measured.
Resistance Measurement
Measuring Principle
R
m
R
x
1
1
R
i
-----
i 1=
n
∑
------------------+=
R
x
1
1
R
i
-----
i 1=
n
∑
------------------»
R
x
R
1
R
n
R
2
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