-22-
measure the loop resistance, and the single-point grounding is not
measured. However, users will be able to use a testing line very
near to the earth electrode of the grounding system to artificially
create a loop for testing. The following presented is two kinds of
methods for the single-point grounding measurement by use of the
Meter. These two methods can be applied to the occasions beyond
the reach of the traditional voltage-current testing methods.
.Two⑴ -Point Method
As shown in the figure below, in the vicinity of the measured
grounding body R
A,
find an independent grounding body of better
grounding state R
B
(for example, near a water pipe or a building).
R
A
and R
B
line will connect to each other using a single testing line.
As the resistance value measured by the Meter is the value of the
series resistance from the testing line and two grounding
resistances.
R
T
=R
A
+ R
B
+ R
L
Where: R
T
is the resistance value measured with the Meter.
R
L
is the resistance value of the testing line. Meter can
measure out the resistance value by connecting the test lines with
both ends.
To Next Page
Loading...
