Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1995-04-13
1996-06-04
Swarthout, Brent A.
Communications: electrical
Condition responsive indicating system
Specific condition
340628, 250205, 250574, 356338, 356438, G08B 17107
Patent
active
055237436
ABSTRACT:
The present invention provides a method for detecting whether an alarm circuit is operating outside its sensitivity range, the alarm circuit having a background signal and a preset alarm threshold signal. The method involves: a) multiplying the background signal by a first gain factor to produce a first test signal; b) comparing the first test signal against an alarm threshold signal; c) multiplying the background signal by a second gain factor less than the first gain factor to produce a second test signal; and d) comparing the second test signal against the alarm threshold signal. The alarm circuit is operating outside its sensitivity range when the first test signal is less than the alarm threshold signal or the second test signal is greater than the alarm threshold signal.
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Mi Zhexin
Peterson John
Rattman William J.
Digital Security Controls Ltd.
Swarthout Brent A.
Wu Daniel J.
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