Scanning system using alternating current for indicating the ope

Details Scanning system using alternating current for indicating the ope Scanning system using alternating current for indicating the ope

1979-08-09

1982-07-20

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

340644, 340650, G01R 3102

Patent

active

043408524

ABSTRACT:
A simple but effective means for employing alternating polarity current in a discrete inputs can system is disclosed. The system permits scanning of a field contact for open mode, closed mode and for the presence or absence of spurious ground contacts.

REFERENCES:
patent: 2895106 (1959-07-01), Taunt
patent: 3505664 (1970-04-01), Morris
patent: 3766435 (1973-10-01), Childers
patent: 3840782 (1974-10-01), Monaghan
patent: 3877000 (1975-04-01), Kosco
patent: 4104620 (1978-08-01), Cronin
patent: 4134025 (1979-01-01), Levin

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