Fluke 1625Earth/Ground Manual do Utilizador descarregar pdf (Página 55)

Earth/Ground Tester

Procedure of Measurements

Distances of Probe

Soil restivity

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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Fluke 1625Earth/Ground Manual do Utilizador Página 55