METREL EurotestXE, Instruction Manual

Page: 59 / 114

MI 3102(H) BT Eurotest XE Measurements
59
5.8.3 Specific earth resistance measurement
The specific earth resistance (soil resistivity) is measured to determine the characteristic of the
soil. The results are used to properly dimension earthing systems (size, depth, number and
position of earthing rods).
Circuit for specific earth resistance measurement
Figure 5.41: Specific earth resistance measurement
Specific earth resistance measurement procedure:

Select EARTH function using the function selector keys.

Set sub-function to EARTH

using UP / DOWN keys.

Select the distance (a) between test probes.

Connect A 1199

adapter to the instrument.

Connect the test leads to earth probes (see Figure 5.41 ).

Press the TEST key to perform the measurement.

Store the result by pressing the MEM key (optional).
Figure 5.42: Example of specific earth resistance measurement result
Displayed results for earth resistance measurement:

............... specific earth resistance
Rc ............ resistance of H, E (current) probe
Rp ............ resistance of S, ES (potential) probe
Notes:

High resistance of S, H, ES, E probes could influence the measurement results. In this
case, “Rp” and “Rc” warnings are displayed.

High noise currents and voltages in earthing could influence the measurement results.
The tester displays the “noise” warning in this case.