Solid state, high-low resistance monitor

Electricity: measuring and testing – Conductor identification or location – Inaccessible

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340660, G01R 2702

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active

045945420

ABSTRACT:
A resistance monitoring solid state circuit distinguishes between a minimum high resistance condition and a maximum low resistance condition by current mode switching of a pair of transistors the switching control voltages of which are established by bias resistor networks forming legs of a bridge, with the monitored resistance in one leg, the transistors switching current flow into one or the other of two logic signal generating paths that include opto-isolators for electrical isolation from utilization circuitry.

REFERENCES:
patent: 3086170 (1963-04-01), Kemelhor et al.
patent: 3479589 (1967-02-01), Owens
patent: 3530378 (1970-09-01), Holle et al.
patent: 3628099 (1971-12-01), Atkins et al.
patent: 3875501 (1975-04-01), Hayashi
patent: 4031461 (1977-06-01), Reiner
patent: 4052664 (1977-10-01), Pohl
patent: 4110571 (1978-08-01), Hills
patent: 4298969 (1981-11-01), Rickenbacker
Callahan, Current/Voltage Variation Detector, IBM Technical Disclosure Butin, vol. 21, No. 10, Mar. 1979, pp. 3992-3993.

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