Oscillator damped test and evaluation circuit for a proximity sw

Details Oscillator damped test and evaluation circuit for a proximity sw Oscillator damped test and evaluation circuit for a proximity sw

1988-09-23

1991-01-22

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Displacement

32420712, 331 65, 307116, G01B 714, G01N 2700, H01H 3500, H01H 6300

Patent

active

049873660

ABSTRACT:
A proximity switch having a test and an evaluation circuit contains a control circuit for generating pulses, an oscillator, a periodically activated damping circuit for the oscillator and a relay circuit. The test circuit, with the damping circuit and a control circuit, generates a pulse sequence required for the active testing only so long as the proximity switch is not damped by an outside element. The evaluation circuit carries a response current only as long as the test circuit also actively tests in its faultless condition.

REFERENCES:
patent: 4327433 (1982-05-01), Nodera et al.
patent: 4433309 (1984-02-01), Hermle et al.
patent: 4492925 (1985-01-01), Kammerer et al.
patent: 4866377 (1989-09-01), Macouschi

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