Method and apparatus for determining resistance at radio frequen

Details Method and apparatus for determining resistance at radio frequen Method and apparatus for determining resistance at radio frequen

1974-04-29

1976-10-19

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324 51, G01R 2702

Patent

active

039873900

ABSTRACT:
The radio frequency resistance between a pair of conductive elements, for example, adjacent pipe sections of a pipeline, which are coupled together through an insulator, may be determined by contacting each pipe section with one of a pair of probes or electrodes connected across the output of a radio frequency oscillator which is coupled to the input of a rectifier and filter circuit. The probes are connected across the oscillator output through a resistor which insures that the direct current output of the rectifier is directly proportional to the RF resistance between the pipe sections. The output of the rectifier is coupled to a meter through an operational amplifier. The meter, which provides a direct readout of the resistance being measured, may be provided with a current limiting circuit which protects the meter from excessive DC current. Calibrating means may be provided to enable adjustment of the gain of the operational amplifier for resistance readings within several ranges.

REFERENCES:
patent: 2871446 (1959-01-01), Wann
patent: 3163817 (1964-12-01), Simpson
patent: 3750016 (1973-07-01), Oakley
patent: 3769576 (1973-10-01), Norkaitis

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