Circuit arrangement for monitoring interruptions in two closed-c

Details Circuit arrangement for monitoring interruptions in two closed-c Circuit arrangement for monitoring interruptions in two closed-c

1975-10-07

1977-07-19

Morrison, Malcolm A.

Communications: electrical

Systems

Call station

324 51, G01D 410, G01R 3102

Patent

active

040372200

ABSTRACT:
A circuit arrangement for monitoring interruptions in each of two closed-circuit loops, which loops are laid in at least one cable. One end of each loop is connected, with the optional interposition of circuit elements, to one pole of a voltage source, the other end of each loop being connected, via a resistance network, to the other pole of the voltage source. Potentials derived from points in the resistance networks are used to directly control an electronic switching element which changes its conductivity state in the event of any interruption in at least one loop. Interruptions in the respective loops lead to a corresponding rise or fall in potential of the respective network whereby the electronic switching element is actuated. In a preferred embodiment, the resistance networks are rated so that with an interruption in one of the loops, the control voltage applied to the switching element is approximately zero, the switching element is a field-effect transistor of the self-conducting type, and the conductive state of that field-effect transistor serves additionally to monitor the loops in respect of short-circuiting.

REFERENCES:
patent: 3032708 (1962-05-01), Wise
patent: 3354389 (1967-11-01), Hordosi
patent: 3594635 (1971-07-01), Minamii et al.
patent: 3920973 (1975-11-01), Avellar et al.
Formica G; Cable Tester; IBM Technical Disclosure Bulletin; vol. 16, No. 12, May 1974.
Coleman et al; Cable Continuity Checker; IBM Technical Disclosure Bulletin; vol. 15, No. 1; June 1972.

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