Resistance Measurement; Measuring Principle - Hioki FT6380-50 Manual De Instrucciones

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 FT6031-50 Earth Tester or Hioki
FT3151 Analog Earth Tester).
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
HIOKI FT6380B983-00
2.4 Measurement Procedure
, R
1 2
R
2
29
, ..., R , the resis-
n
R
n