Resistivity measurements for Design : MEASUREMENT OF SOIL RESISTIVITY- SCHLUMBERGER METHOD

Schlumberger method is a modification of the Wenner method, since it also uses 4 electrodes, but in this case the central electrode gap or potential (a) is kept constant, and measurements were made by varying the electrode gap external electrodes from internal multiples distance (na) of the basic separation of internal electrodes (a).

The configuration and the expression of the resistivity for this method of measurement is shown in Fig.

Schlumberger method is useful when you need to know the resistivity of deeper layers, without the need for many measurements such as the Wenner method. It is also used when measuring devices are not very smart. Only recommended to make measurements at 90 degrees so that the readings are not affected by underground structures.