Electric lamp and discharge devices: systems – With signal – indicator – or alarm – Plural signals – indicators – or alarms
Patent
1986-09-05
1987-09-01
Dixon, Harold
Electric lamp and discharge devices: systems
With signal, indicator, or alarm
Plural signals, indicators, or alarms
315131, 315194, 315307, 340644, H01J 160
Patent
active
046911430
ABSTRACT:
A circuit status indicating device is used to monitor separate circuits to indicate their on/off status. Each circuit conducts an AC operating signal when switched to "on" status and an AC non-operating signal when switched to "off" status. The AC non-operating signal can be zero or some fraction of the AC operating signal, depending on the type of contact switches used in the circuit being monitored. A separate LED is provided for each circuit monitored. A separate AC input signal corresponding to one of the AC operating and non-operating signals in each monitored circuit is received and compared with a modified AC reference signal to produce an AC comparison output signal. A DC reference signal is compared with the AC comparison output signal and produces a DC output signal when the AC comparison output signal exceeds the DC reference signal. The AC comparison output signal is above the DC reference signal when, after brief delay of some input cycle periods or fraction thereof, it corresponds to the AC operating signal and is below the DC reference signal when it corresponds to the AC non-operating signal. The DC output signal operates the corresponding LED from " off" to "on" condition. In absence of the DC output signal, the LED is operated from "on" to "off" condition.
REFERENCES:
patent: 3136920 (1964-06-01), Jensen
patent: 4211956 (1980-07-01), Bloyd
patent: 4342947 (1982-08-01), Bloyd
patent: 4484180 (1984-11-01), DeForeit
Aero-Metric General, Inc.
Dixon Harold
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