Ground Resistance Tester Model 6471
43
> 2s
AUTO
H
S
ES
E
ρ
S
A
d
d
Ω
m
k
Ω
k
Ω
AUTO
H
S
ES
E
ρ
S
A
d
d
Ω
m
k
Ω
k
Ω
5.7 Earth/Ground Measurements with Two Clamps
This is a quick way to measure the value of the earth.
NOTE:
Any error that occurs will be on the high side without the need of
auxiliary electrodes.
The current clamp connected to terminal
H (Z)
applies a voltage to the circuit to be
measured. The value of the resulting current is determined by the impedance of
the circuit to be measured. The current flowing in the loop is measured using the
clamp connected to terminal
ES (Xv)
. The device then calculates loop resistance
R
LOOP
from these quantities.
NOTE:
Use only SR182 or MN82 current clamps, which are specially designed
to operate with the Model 6471.
1.
Set the switch to
.
2.
Connect a clamp to terminal
H (Z)
and clamp it to a point down stream from
the rod under test that is a serial path to the earth.
3.
Connect the other clamp to terminal
ES (Xv)
and clamp it to the rod or elec
-
trode system to be measured.
R
E
R
E1
R
E2
R
E3
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