LEM A188506510, Руководство по эксплуатации

Страница: 59 / 66

57
12.2 Soil resistivity
ρ
E
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
Ω
m
(see picture)
The soil resistivity significantly depends on the specific kind of material ( farming soil,
dry sand, moist sand, concrete, gravel etc.), but also depends on seasonal 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.