Calculation Of Resistivity; Fig.19 Resistivity Calculation Nomogram - Megger DET5/4R Guide De L'utilisateur

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CALCULATION OF RESISTIVITY

Assuming that the tests were carried out in
homogeneous soil the resistivity is given by the
formula:-
ρ ρ = 2πaR
where 'R' is the resistance measured in ohms, 'a' is the
test spike spacing in metres and 'ρ ρ ' is the resistivity in
ohm-metres.
For non-homogeneous soils the formula will give an
apparent resistivity which is very approximately the
average value to a depth equal to the test spike
spacing 'a'.
Fig. 19 Resistivity calculation Nomogram
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