Fluke 1623-2 Manual - Page 33

ER Ea

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Earth/Ground Tester Advanced Operation From the indicated resistance value RE, the soil resistivity calculates according to the equation: ρ E = 2π .a.RE ρE ...... mean value of soil resistivity (Ωm) RE ...... measured resistance (Ω) a ...... probe distance (m) The measuring method according to Wenner determines the soil resistivity down to a depth of approx. the distance "a" between two earth stakes. By increasing "a", deeper strata can be measured and checked for homogeneity. By changing "a" several times, a profile can be measured from which a suitable earth electrode can be determined. According to the depth to be measured, "a" is selected between 2 m and 30 m. This procedure results in curves depicted in the graph below. 1 3 2 Soil restivity ρE Curve 1: Curve 2: A Distances of Probe edw021.eps As ρE decreases only deeper down, a deep earth electrode is advisable As ρE decreases only down to point A, an increase in the depth deeper than A does not improve the values. 25 MyFlukeStore Shop for Fluke products online at: www. .com 1.877.766.5412

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Earth/Ground Tester
Advanced Operation
25
From the indicated resistance value R
E
, the soil resistivity calculates according to the
equation:
E
E
R
a
.
.
2
π
ρ
=
ρ
E
......
mean value of soil resistivity (
Ω
m)
R
E
......
measured resistance (
Ω
)
a
......
probe distance (m)
The measuring method according to Wenner determines the soil resistivity down to a
depth of approx. the distance "a" between two earth stakes. By increasing "a", deeper
strata can be measured and checked for homogeneity. By changing "a" several times, a
profile can be measured from which a suitable earth electrode can be determined.
According to the depth to be measured, "a" is selected between 2 m and 30 m. This
procedure results in curves depicted in the graph below.
Distances of Probe
Soil restivity ρE
A
2
1
3
edw021.eps
Curve 1:
As
ρ
E decreases only deeper down, a deep earth electrode is advisable
Curve 2:
As
ρ
E decreases only down to point A, an increase in the depth deeper
than A does not improve the values.
Shop for Fluke products online at:
1.877.766.5412
www.
MyFlukeStore
.com