ETCR ETCR2000+ Manual page 25

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.
⑴
.Two -Point Method
As shown in the figure below, in the vicinity of the measured
grounding body R
grounding state R
R and R line will connect to each other using a single testing line.
A B
As the resistance value measured by the Meter is the value of the
series resistance from the testing line and two grounding
resistances.
R =R
T
Where: R is the resistance value measured with the Meter.
T
R is the resistance value of the testing line. Meter can
L
measure out the resistance value by connecting the test lines with
both ends.
find an independent grounding body of better
A,
(for example, near a water pipe or a building).
B
+ R + R
L
A B
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