Ground Resistance Tester Model 6471
33
To measure the resistances of auxiliary electrodes H (Z) and S (Y), or if the resis-
tance of the electrodes is too high (see § 10.1), start the measurement with a long
press of the START/STOP button.
R
H
, R
S
will be displayed.
> 2s
EARTH
AUTO
H
S
E
Ω
kΩ
kΩ
NOTE: Repeat the process at 52% and at 72% for the S electrode.
5.4.2 Full Method
A more thorough measurement can be obtained by taking measurement by mov-
ing the S (Y) auxiliary electrode every 10% between H (Z) and E (X) and plotting
the results. A distinct plateau should result as shown below.
0 10
R10
R20
R30 R40 R50
% H - E
R60
R70
R80
R90
20 30 40 50 60 70 80 90 100
Take the average of the 3 or 4 readings on the
plateau to obtain the earth electrode resistance.
R =
R40 + R50 + R60 + R70
4
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