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Earth/Ground Tester
Procedure of Measurements
47
Distances of Probe
Soil restivity
E
A
1
2
3
edw021.eps
Curve 1: As ρE decreases only deeper down, a deep earth electrode is advis-
able
Curve 2: As ρE decreases only down to point A, an increase in the depth
deeper than A does not improve the values.
Curve 3: With increasing depth ρE is not decreasing: a strip conductor elec-
trode is advisable.
As measuring results are often distorted and corrupted by underground pieces
of metal, underground aquifers etc, a second measurement, in which the spike
axis is turned by an angle of 90 ° , is always advisable (see picture).