MRU-200-GPS OPERATING MANUAL Version 1.06
21
3.4 Measurement 4p
The four-pole method is recommended in the case of measurements of earth ground resistance
of very low values. It eliminates the influence of test lead resistance on the result of the measure-
ment. To evaluate the earth ground resistance, measurements are repeated as described in section
3.9.
Disconnect the tested earth electrode for the object installation.
Turn the meter on.
Set the rotary
function selector switch at
4P
.
E
S H
E
ES
S
H
CA
T
IV
3
00
V
ES
Drive the current probe into the ground and connect to the
H
socket of the meter.
Drive the voltage probe into the ground and connect to the
S
socket of the meter.
Connect the earth ground electrode under test to the
E
socket of the meter.
Connect the
ES
socket to the earth ground electrode under test below the
E
cable.
Align all electrodes in a straight line.
