Ground Resistance Tester Model 6471
41
taking care not to form loops, and to avoid placing the cables near or parallel to
metallic conductors (cables, rails, fences, etc.).
5.
Start the measurement by pressing the START/STOP button.
W
AUTO
m
H
S
ES
E
d
ρ
Ω
d
d
k
Ω
m
ρ
W
= 2.π.d.R
S-ES
To display the measurement parameters, press DISPLAY several times.
The device displays the following parameters:
ρ
W
, R
S-ES
, d, U
S-ES
, I
H-E
, U-Act (U
S-ES
and its frequency, U
H-E
and its frequency).
To measure the resistances of the auxiliary electrodes H (Z), S (Y), ES (Xv) and E
(X), or if the resistance of the electrodes is too high (see § 10.1), start the measure-
ment by a long press of the START/STOP button.
R
P-E
and R
P-H
, then R
P-ES
and R
P-S
will be displayed.
> 2s
W
AUTO
H
S
ES
E
d
ρ
d
d
k
Ω
m
kΩ
kΩ
W
AUTO
H
S
ES
E
d
ρ
d
d
k
Ω
m
kΩ
kΩ
5.6.5 Schlumberger Method
1. Set the switch to .
2. Place electrodes S (Y) and ES (Xv) at a distance A apart, then place elec-
trodes H (Z) and E (X) in the same straight line, at a distance d measured from
the midpoint of distance A. Distance d must be between 2 and 30m.
3.
Drive the electrodes to a depth p of not more than 1/20 of d.
4.
Connect the cables to the electrodes, then to terminals H (Z), S (Y), ES (Xv),
and E (X).
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