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1625
Users Manual
34
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
Auxiliary
earth
electrode
Probe
Earth
electrode
4 pole
>20 m >20 m
edw012.eps
Figure 9. 3-pole/4-pole Measurement of Earthing Resistance - Process
1. Turn central rotary switch to position "R
E
3pole" or "R
E
4pole"
The instrument is to be wired according to picture and notices given
on the display.
A flashing of the sockets symbols EFGH or A, points to an
incorrect or incomplete connection of the measuring lead.
2. Press "START TEST" button
Now a fully automated test sequence of all relevant parameters like
auxiliary earth electrode, probe- and earth electrode resistance, is im-
plemented and finished with the display of the result R
E
.
3. Read out measured value R
E
4. Call R
S
and R
H
with "DISPLAY MENU".
Remarks for the setting of earth spikes:
Before setting the earth spikes for probe and auxiliary earth electrode make
sure that the probe is set outside the potential gradient area of earth electrode
and auxiliary earth electrode (also see “The Influence of Potential Gradient
areas on Earth Resistance Measurement”). Such a condition is normally
reached by allowing a distance of > 20 m between the earth electrode and the
earth spikes as well as of the earth spikes to each other.