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1625-2
Users Manual
32
Measurement of Soil Resistivity
The soil resistivity is the geological and physical quantity for calculation and design of
earthing systems. The measuring procedure shown in Figure 11 uses the method
developed by Wenner (F. Wenner, A method of measuring earth resistivity; Bull. National
Bureau of Standards, Bulletin 12 (4), Paper 258, S 478-496; 1915/16).
START
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1 2
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Figure 11. Measurement of Soil Resistivity
1. Four earth spikes of the same length are positioned into the soil in an even line and
with the same distance "a" to each other. The earth spikes should not be deeper than
a maximum of 1/3 of "a".
2. Turn central rotary switch to position "R
E
4pole".
The instrument is to be wired according to picture and notices given on the display.
A flashing of the sockets symbols or , points to an incorrect or
incomplete connection of the measuring lead.
3. Push "START TEST" button.
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