12
3. Find the most appropriate range and press the START Pushbutton'.
4. To obtain the soil resistivity value, Wenner’s equation should be
applied. In its simplified form, this equation is as follows:
ρ = 2π R D
Where:
• ρ = soil resistivity value, expressed in [Ωm]
• π = 3.14159
• R = value shown on the display.
• D = distance between the rods, expressed in meters.
In this way, mean soil resistivity is obtained from the surface up to a
depth equal to the D distance between the rods. The information
required to determine the soil stratification by means of a graphic
method or by the use of an appropriate software is obtained by
performing several measurements with different distances between the
rods. The distances which are generally adopted are: 1m, 2m, 4m, 8m,
16 m. In order to carry out measurements with D=16m, cables can be
distributed as shown in figure 03, with the instrument near the ES rod.
D
H(E)
C
S(E)
T
XT
E(E)
XC
40m cable
5m cable
fig. 03
20m cable
To Next Page
Loading...