© PCE Instruments
5
1.
To use a simplified measurement procedure, proceed as follows:
(1) This method is recommended where the earth resistance is higher than 10
Ω
and where it is not possible to drive auxiliary electrodes into the ground. An
approximate value can be determined by the two-wire system which can be seen
in the figure below.
(2) Move the measuring function selector to the "EARTH VOLTAGE" position and
press the "TEST" key. Make sure that the ground voltage is below 10 V.
(3) First, move the measuring function selector to the measurement range 200
Ω,
press the "TEST" key and read the measured value. If the display shows "1"
(measurement range exceeded), switch to the range 2000
Ω and read the value.
(4) The read value (Re) is an approximate earth resistance value. In this
measurement, the test leads P and C do not have to be shot-circuited before the
start of the measurement as the special included test lead is used. Tis test lead
already has a connection between the two sockets (red test line, see figure).
(5) Actual grounding resistance = read value
– earth resistance of earth electrode
RX
=
Re
-
re
