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1. 发明授权

US4777473A Alarm system incorporating dynamic range testing 失效
标题翻译：包含动态范围测试的报警系统
公开(公告)号：US4777473A
公开(公告)日：1988-10-11
申请号：US899548
申请日：1986-08-22
申请人： Lance Weston , Harry D. Schweiger
发明人： Lance Weston , Harry D. Schweiger
IPC分类号： G08B29/14 , G08B29/00
CPC分类号： G08B29/14
摘要： An alarm system incorporating a dynamic range testing feature whereby the system polls and tests, on a regular basis, the resistance of the circuits of alarm condition resistor elements in the alarm system, primarily to detect when the circuit of a resistor element has degraded to a pre-trouble resistance range, such that the circuit of the resistor element can be serviced and repaired prior to its degrading to a point which will trigger the alarm system. The alarm system includes a central control system, and a plurality of modules at potential alarm locations coupled by a pair of connecting lines to the central control system. Each module includes two alarm condition resistor elements associated therewith for detecting an alarm condition, which is indicated by an increase in the electrical resistance thereof, as by the opening of a switch or the breakage of a resistor element, and each module further includes a reference resistor which is provided for a reference measurement. The central control system measures the resistance of the connecting line with the reference resistor coupled thereto to enable the resistance of the connecting line to be determined. The central control system also measures the resistance of the connecting line with each alarm condition element coupled thereto during different time subperiods, to enable the resistance of each alarm condition element circuit to be determined separately.
摘要翻译：一种包含动态范围测试功能的报警系统，其系统轮询和测试报警系统中报警状态电阻元件的电路的电阻，主要是检测电阻元件的电路何时已经降至预防电阻范围，使得电阻元件的电路在其降级到将触发报警系统的点之前可以被维修和修理。报警系统包括中央控制系统，以及通过一对连接线耦合到中央控制系统的潜在报警位置处的多个模块。每个模块包括与其相关联的两个报警状态电阻器元件，用于检测报警状态，其由电阻的增加指示，如通过开关的断开或电阻元件的断裂，并且每个模块还包括参考提供给参考测量的电阻器。中央控制系统测量与连接到其上的参考电阻的连接线的电阻，以确定连接线的电阻。中央控制系统还在不同的时间次周期期间测量与连接到其上的每个报警条件元件的连接线的电阻，以便分别确定每个报警条件元件电路的电阻。

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