MRU-200
● MRU-200-GPS – USER MANUAL
21
3.4
Earth resistance measurement with 4-wire method (R
E
4P)
The 4-wire method is recommended in the case of measurements of earth resistance of very low
values. It permits to eliminate the influence of the test leads resistance over the result of the meas-
urement. In order to evaluate the resistance of the ground it is recommended to use the dedicated
measurement function (point 3.9).
Disconnect the tested earth electrode for the object installation.
Turn the meter on.
Set the rotational
function selector at
4P
.
E
S H
E
ES
S
H
CA
T
IV
3
00
V
ES
Connect the current electrode driver into ground to the
H
socket of the meter.
Connect the voltage electrode driver into ground to the
S
socket of the meter.
Connect the tested earth electrode to the
E
socket of the meter.
Connect the
ES
socket to the earth electrode In question below the
E
cable.
The tested earth electrode as well as the current electrode and voltage electrode
should be aligned.
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
mains frequency set in the MENU.
