Abstract: A soil electrode assembly supports an electrode member disposed in soil in front of another electrode member so that a resistivity of a volume of the soil that is between the electrode members is measured by energizing and monitoring the electrode members. The soil electrode assembly includes a substantially flat support member having two principal opposite faces and a lower end drivable into the soil. The support member is made of rigid material. One of the faces of the support member includes a first opening providing an access to a first compartment. The soil electrode assembly also includes a substantially flat insulating member having two principal opposite faces. The insulating member is mounted in the first compartment. One of the faces of the insulating member includes a second opening providing an access to a second compartment. An electrode member is mounted in the second compartment.

Abstract: A probe assembly for measuring resistivity of a soil is connected to a measuring apparatus capable of generating a constant DC current signal into two electric leads. The probe assembly includes a short circuit connector; double-pole double-throw switch having two fixed contacts, and two switched contacts alternatively connectable to the electric leads or to the short circuit connector, respectively; and two electrodes connected to the fixed contacts respectively. Each of the electrodes has a portion of its surface forming a conductive surface. The conductive surfaces are substantially opposite to each other when the electrodes are put into the soil. In a stand-by position, the switched contacts are connected to the short circuit connector.