AEMC 6471 User Manual page 46

Observe the following minimum distances between the two clamps in order to
avoid direct electromagnetic influences between the transmitting clamp and the
receiving clamp:
Value measured
0 to 1
1 to 5
5 to 10
10 to 50
50 to 100
100 to 500
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 = R + ( R
LOOP E
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).
44
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(Ω)
0.4m (1' 04")
0.5m (1' 08")
0.7m (2' 04")
// R // R )
E1 E2 E3
> 2s
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Minimum separation
MN82
0.1m (4")
0.9m (3')
1.2m (4')
H
ES
Ground Resistance Tester Model 6471
SR182
0m (0")
0.1m (4")
0.2m (8")
0.3m (1')
0.5m (1' 08")
0.5m (1' 08")
Ω
m A
Hz
AUTO
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