The sensitivity function makes it possible to evaluate the influence of a unit volume of the ground on the measured potential difference. The diagram below shows the contour pattern for various arrays (Wenner, Wenner-Schlumberger and Dipole-Dipole).

Function of sensibility for Wenner, Wenner-Shlumberger
and Dipole-Dipole configuration.

It is immediately noted that the values of this function differ according to the configurations. Each one will have their particular characteristics. This is especially valid at larger distance from the electrodes. The differences in pattern of this function will enable us to better appreciate the response of different arrays to different the types of structures.