Fluke 1625 FE 1625 Users Manual - Page 53

Measurement of Soil Resistivity

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Earth/Ground Tester Procedure of Measurements 3. Call display RK 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, RK 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 resistivity; Bull. National Bureau of Standards, Bulletin 12 (4), Paper 258, S 478496; 1915/16). START TEST 1625 EARTH / GROUND TESTER H /C2 DISPLAY MENU Earth/Ground Resistance 300 k RA AC Resistance 300 k R DC Low Resistance 3k R 4 POLE 3 POLE 2 POLE 2 POLE CHANGE ITEM 4 POLE 3 POLE 4 POLE SELECT OFF S/P2 ES/P1 E /C1 Figure 16. Measurement of Soil Resistivity edw020.eps 45

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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
Earth/Ground Resistance 300k
AC
Resistance
300k
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