MRU-200
● MRU-200-GPS – USER MANUAL
38
3.10 Earth resistivity measurement
(ρ)
For the purpose of earth resistivity measurements
– which are used as a preliminary measure for
the project of earthing systems or in geology
– there is a separate function, which is selected by
means of the rotational function selector: earth resistivity measurements
. The function is metrolo-
gically identical as the 4-wire earth resistance measurement, but it includes an additional procedure
of storing of the distance between the electrodes. The result of the measurement is the resistance
value which is calculated automatically in accordance with the following formula:
ρ = 2
LR
E
, which is
used in the Wenner’s measurement method. The method in question assumes equal distances be-
tween electrodes.
Turn the meter on.
Set the rotational
function selector at
ρ
.
E
L
L
L
S H
ES
Connect the four aligned and equally spacer electrodes, which are driven into the ground,
to the meter, and do so In accordance with the diagram above
The meter is ready for measurement.
The auxiliary display shows the value of
the interference voltage and its fre-
quency. The setting bar shows the
measurement voltage, mains frequency
set in the
MENU
and the distance be-
tween the electrodes.
Press
F1
to change the measurement
voltage.
