CPC 100 V1.41
7 - 18
Figure 11:
Measuring the soil
resistivity
Legend:
ρ = soil resistivity
d = distance between auxiliary electrodes (identical between all electrodes)
R = calculated resistance as indicated at the RGround test card (R(f))
With the spacing of "d", the test measures the average soil resistivity between
the U auxiliary electrodes down to a depth of "d". Therefore, varying "d" also
varies the depth of the volume for which the soil resistivity is to be measured.
The following table lists typical resistivity of some common soil types.
Δ U
dd d
Auxiliary
electrode
U
Auxiliary
electrode
U
Auxiliary
electrode
I
Auxiliary
electrode
I
I
d = distance
d/20
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