Earth/Ground Tester
Procedure of Measurements
| 1 |
|
| 2 | 3 |
E |
|
|
restivity |
|
|
Soil | A |
|
| Distances of Probe |
|
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).
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