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(mutual supply); unipolar (direct supply); ideal; non-ideal (real)
(Figure 1.1)
From Figure 5.1 shows that the potential probes - are those
in which the distance between the same name (pair) electrodes A,
B or M, N is much larger (5 - 10 times) than between different
nominal (odd) A and M (L), that is l >> L.
Gradient probes - are those for which l << L.
Series probes - are those who have the same name
electrodes located below the different nominal.

Figure 1.1 - Classification the probe of electrical resistance
method

Inverse (roofing) probes - are those in which the same
name electrodes are above the different name.
Single pole - are those in which in the well is one current
electrode (A).
Bipolar - are those in which in well located two current
electrodes A and B.
Ideal potential probe - is one in which l → ∞.
Ideal gradient probe - is one in which l → 0.
Besides it probes are characterized by:

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