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1. 发明授权

US4580091A Continuity tester 失效
标题翻译：连续性测试仪
公开(公告)号：US4580091A
公开(公告)日：1986-04-01
申请号：US596008
申请日：1984-04-02
申请人： David G. Robinson , Ian K. Baker
发明人： David G. Robinson , Ian K. Baker
IPC分类号： G01R31/02 , G01R31/08
CPC分类号： G01R31/026
摘要： The present invention provides a continuity tester comprising a D.C. coupled amplifier for providing a voltage to a transducer through a voltage threshold means, an A.C. attenuator for providing positive feedback to the amplifier, a first resistor connected between the input and the output of the amplifier and a second resistor connected in series with the transducer between the input and the output of the amplifier, the first and second resistors providing negative feedback to the amplifier, and means for connecting a circuit to be tested in parallel across the second resistor, whereby if the impedance of the test circuit is below a predetermined value, the amplifier becomes unstable and causes the transducer to produce a signal whose frequency is dependent on the impedance of the test circuit.
摘要翻译：本发明提供一种连续性测试仪，其包括一个DC耦合放大器，用于通过电压阈值装置向换能器提供电压; AC衰减器，用于向放大器提供正反馈;连接在放大器的输入和输出端之间的第一电阻; 与所述放大器的输入和输出之间与所述换能器串联连接的第二电阻器，所述第一和第二电阻器向放大器提供负反馈，以及用于将待测试电路并联连接到第二电阻器的装置，由此如果测试电路的阻抗低于预定值，放大器变得不稳定，并使换能器产生频率取决于测试电路的阻抗的信号。

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