Sonel MPI-540 - Measuring Soil Resistivity; Settings of Measurements

MPI-540 – USER MANUAL
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3.6 Measuring soil resistivity
For soil resistivity measurements – used as preparation for the designing the earthing system or
in geology measurements – a separate function is provided: measurement of soil resistivity  This
function is identical to 4-wire measurement of earth resistance, however, it contains an additional pro-
cedure of entering the distance between the electrodes. The measurement result is the resistivity val-
ue, calculated automatically according to the formula applied in Wenner method:
ρ = 2  LR
E
where:
L – distance between the electrodes (all distances must be equal),
R
E
– measured resistance.
3.6.1 Settings of measurements
Select item Ωm.
Touch the parameter drop-down
menu Un (measuring voltage se-
lection).