-25-
number of the grounding bodies mutually linked in your grounding
system, it is necessary to measure the same number of the testing
values for calculating of the program, not more or less. And the
program would output the same number of grounding resistance
values.
3. Single-Point Grounding System
From the measuring principle,
ETCR
series Meter can only meas-
ure 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
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.
