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Earth/Ground Tester
Procedure of Measurements
45
3. Call display R
K
with "DISPLAY MENU" button.
4. Implement compensation with "START TEST" button.
The compensation resistance is displayed only for as long as the "START
TEST" button is kept pressed. After releasing the "START TEST" button the
measured value is stored and the measuring instrument returns to the standard
settings at the beginning of the measurement so that a succeeding measurement
of the earthing resistance can be implemented by pressing "START TEST"
again. Thereafter, R
K
is subtracted from the actual measured value.
If the compensation value has to be reset to the basic setting (0.000 Ω), the
compensation sequence has to be implemented with an open (disconnected)
measuring lead or turn the switch to the next position and back.
Measurement of Soil Resistivity
The soil resistivity is the geological and physical quantity for calculation and
design of earthing systems. The measuring procedure applied below uses the
method developed by Wenner (F.Wenner, A method of measuring earth resis-
tivity; Bull. National Bureau of Standards, Bulletin 12 (4), Paper 258, S 478-
496; 1915/16).
R
RA
R
Earth/Ground Resistance 300 k
AC
Resistance
300 k
DC Low Resistance 3k
CHANGE
ITEM
SELECT
START
TEST
DISPLAY
MENU
H/C2
S/P2
ES/P1
E/C1
4
POLE
3
POLE
4
POLE
2
POLE
2
POLE
4
POLE
OFF
3
POLE
EARTH / GROUND TESTER
1625
edw020.eps
Figure 16. Measurement of Soil Resistivity