发明名称 |
Self-diagnostic smoke detector |
摘要 |
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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申请公布号 |
US5523743(A) |
申请公布日期 |
1996.06.04 |
申请号 |
US19950422512 |
申请日期 |
1995.04.13 |
申请人 |
DIGITAL SECURITY CONTROLS LTD. |
发明人 |
RATTMAN, WILLIAM J.;MI, ZHEXIN;PETERSON, JOHN |
分类号 |
G08B29/14;G08B29/18;(IPC1-7):G08B17/107 |
主分类号 |
G08B29/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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