AEMC 6471 - Manual Settings for mΩ Measurements

44 Ground Resistance Tester Model 6471
Observe the following minimum distances between the two clamps in order to
avoid direct electromagnetic inuences between the transmitting clamp and the
receiving clamp:
Value measured
(
Ω)
Minimum separation
MN82 SR182
0 to 1 0.1m (4") 0m (0")
1 to 5 0.4m (1' 04") 0.1m (4")
5 to 10 0.5m (1' 08") 0.2m (8")
10 to 50 0.7m (2' 04") 0.3m (1')
50 to 100 0.9m (3') 0.5m (1' 08")
100 to 500 1.2m (4') 0.5m (1' 08")
1. Start the measurement by pressing the START/STOP button.
In the case of the diagram below, the earth impedance measured is equal to:
R
LOOP
= R
E
+ ( R
E1
// R
E2
// R
E3
)
> 2s
AUTO
Ω
Hz
H
ES
m A
NOTE: In the AUTO mode, the measurement frequency is 1611Hz. To make
an earth measurement that is free of inductive effects, you must change to
MANUAL mode and choose a lower measurement frequency (see §6.2).
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