The test is performed by applying the test current to two spikes
inserted into the soil, and measuring the voltage drop across the
soil in other two spikes, arranged as shown in the following
connection diagram.
The depth of insertion into the soil is relevant only for the amount
of current that can be injected into the ground; the distance d
instead influences the result, as the measured resistivity ? is the
one of the volume of soil having a depth equal to d. In practice, if
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