AEMC 6471 - Manual Mode

Ground Resistance Tester Model 6471 43
> 2s
AUTO
H
S
ES
E
ρ
S
A
d
d
Ω m
kΩ
kΩ
AUTO
H
S
ES
E
ρ
S
A
d
d
Ω m
kΩ
kΩ
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 owing 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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