Instructions

38 GMC-I Messtechnik GmbH
10.7 Earthing Resistance Measurement, Battery Operated – 3-Pole (only MPRO & MXTRA)
3-Wire Method
Measurement of Earthing Resistance with 3-Wire Method
Connection
➭ Position the spikes for the probe and the auxiliary electrode at
least 20, respectively 40 meters from the electrode (see figure
above).
➭ Make sure that no excessively high contact resistances occur
between the probe and the ground.
➭ Attach the PRO-RE adapter (Z501S) to the test plug.
➭ Connect the probe, the auxiliary electrode and the electrode
via the 4 mm banana plug sockets at the PRO-RE adapter.
In doing so, observe labeling on the banana plug sockets.
Terminal ES/P1 is not connected.
The resistance of the measurement cable to the earth electrode is
incorporated directly into the measurement results.
In order to keep error caused by measurement cable resistance
as small as possible, a short connector cable with large cross-
section should be used between the earth electrode and terminal
“E” for this measuring method.
Note
The measurement cables must be well insulated in order
to prevent shunting. In order to keep the influence of pos-
sible coupling to a minimum, the measurement cables
should not cross each other or run parallel to each other
over any considerable distance.
Select Measuring Function
Select Operating Mode
The selected operating mode is displayed inversely:
white battery icon against black background.
Set Parameters
❑ Measuring range: AUTO, 50 kΩ, 20 kΩ, 2 kΩ, 200 Ω, 20 Ω
❑ Connection type: 3-pole
❑ Transformer ratio: irrelevant in this case
❑ Distance d (for measuring
ρ
E
): irrelevant in this case
Start Measurement
PROFITEST MPRO, PROFITEST MXTRA
E
SH
≥ 20 m ≥ 20 m
SHESE
R
E