Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1987-10-26
1989-08-29
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340514, 340650, 340657, 340660, 340661, 340662, 340663, 340511, G08B 1900, G08B 2100
Patent
active
048621420
ABSTRACT:
Electrical circuits for detecting intermittent and continuous electrical parameters such as continuity for open or closed circuits, AC power interruption or decrease in frequency, DC power interruption, missing electrical pulses; and voltage, resistance, and current levels that are greater than or less than present high and low limits. This invention also detects temperature and light (illumination) that is greater or less than present limits. The invention has a memory and both a (variable time delayed) automatic, and a manual memory reset. It provides both visual and a defeatable audio indicators or alarms. The advantage of said invention is that it detects intermittent conditions as brief as fractions of microseconds that may occur as frequently as milliseconds apart or as infrequently as days apart; it also detects steady state conditions. The invention is embodied as individual circuits capable of detecting a single parameter or as a multi-function test circuit having the capability to detecting numerous parameters. This invention is well suited to be packaged as a hand-held test instrument or as "built in" special test or monitoring circuit.
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