DET2/3
18
Earth / ground resistivity
Resistivity
The DET2/3 can measure and calculate resistivity using the Wenner or Schlumberger methods. These are very
similar, both involving placing four pins / stakes into the earth / ground. These only penetrate the soil by a short
distance.
C1
CAT IV 300V
P1
P2
C2
E
ES
S
H
I
V
E
X
Y
V
MVC1010 MVC1010
MCC1010
I
C1 (E) P1 (ES) C2 (H)P2 (S)
a a a
The Wenner method is the most common with the pins / stakes equally spaced in a line. The resistivity is
calculated in the equation:
ρ
= 2πaR
C1
CAT IV 300V
P1
P2
C2
E
ES
S
H
I
V
E
X
Y
V
MVC1010 MVC1010
MCC1010
I
C1 (E) P1 (ES) C2 (H)P2 (S)
a ab
The Schlumberger method has the potential pins / stakes closer together, with a<2b. The resistivity is calculated
in the equation:
ρ
=
π
a(a+b)
R
b
5
Press
OK
6 Connect test leads to instrument
C1
CAT IV 300V
P1
P2
C2
E
ES
S
H
I
V
E
X
Y
V
MVC1010 MVC1010
MCC1010
I
C1 (E) P1 (ES) C2 (H)P2 (S)
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