Fluke 1625Earth/Ground Manual do Utilizador descarregar pdf (Página 84)

1625

Users Manual

Soil Resistivity

The soil resistivity is the resistance measured between two opposing surfaces

of a cube of homogenous soil material with a lateral length of 1 meter. The unit

is Ωm (see picture)

A = 1 m

p =

(

)

L=1 m

edw054.eps

The soil resistivity significantly depends on the specific kind of material (farm-

ing soil, dry sand, moist sand, concrete, gravel etc.), but also depends on sea-

sonal changes. Dry soil has a higher resistivity than moist soil and frozen

ground has a higher resistivity than dry, warm sand (see picture).

The two examples below show the change of resistivity during the course of

one year.

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Fluke 1625Earth/Ground Manual do Utilizador Página 84