36
Ground Resistance Tester Model 6471
AUTO
H
S
E
Ω
k
Ω
k
Ω
ES
> 2s
We recommend repeating the measurement with the auxiliary electrodes placed at
a different distance and in another direction (see § 5.4.3).
5.5.2 Measurements with a Clamp
For this selective earth measurement you need a current clamp, either an SR182
(provided) or an MN82 (available as an accessory). These two types of current
clamps are specially designed to work with the 6471 ground tester.
The SR182 is more precise, suited to the measurement of higher currents (up to
40Arms) and for use on thicker conductors, while the MN82 (which is easier to
handle) accepts currents up to 10Arms and can be placed on conductors up to
3/4" (20mm) in diameter.
1.
Set the switch to
.
2.
Place electrodes
H (Z)
and
S (Y)
at least 30m (98 ft) apart so that there is no
interference between them.
H (Z)
S (Y)
R
E1
R
E2
R
E3
R
E4
> 30 m (98 ft)
> 30 m (98 ft)
In order to avoid electromagnetic interference, it is best to unwind the full length of
each cable from the reel, to keep the cables as far apart as possible on the ground,
taking care not to form loops, and to avoid placing the cables near or parallel to
metallic conductors (cables, rails, fences, etc).
3.
Connect the cables to terminals
H (Z)
and
S (Y)
, connect a cable between
terminal
E (X)
and the earth electrode under test, then connect the clamp to
terminal
ES (Xv)
. The device recognizes it automatically.
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