Probe assembly for measuring resistivity of a soil, and method t

Details Probe assembly for measuring resistivity of a soil, and method t Probe assembly for measuring resistivity of a soil, and method t

1992-05-27

1995-06-27

Regan, Maura K.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324109, G01R 2726

Patent

active

054282969

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. In an operating position for measurement, the switched contacts are connected to the electrical leads, whereby when a measurement is performed, the switched contacts are switched from the stand-by position to the operating position so that the DC current signal can be injected into the electrodes and produce a voltage between the electrical leads that is indicative of the resistivity of the soil between said electrodes.

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Electrometers, Keithley Instruments Mar. 1953.

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