公开(公告)号：US20100134132A1

公开(公告)日：2010-06-03

申请号：US12326552

申请日：2008-12-02

申请人： Colin PRICE ,  Steven BOYLE ,  Asif AHMAD

发明人： Colin PRICE ,  Steven BOYLE ,  Asif AHMAD

IPC分类号： G01R31/02

CPC分类号： G01R19/1659 ,  G01R31/31932 ,  G01R31/362 ,  G01R31/3658 ,  G01R35/00

摘要： A measuring apparatus including a self test function, the circuit comprising a capacitor; first to fourth switches; a test signal injector; at least one comparator having a signal input and a reference input the first switch being interposed between a first plate of the capacitor and a first input node, the second switch being interposed between a second plate of the capacitor and a second input node, the third switch being interposed between the first plate of the capacitor and the signal input of the comparator and the fourth switch being interposed between the second plate of the capacitor and a voltage reference, wherein the self test function comprises the steps of i) operating the signal injector to produce a first signal representative of an out of range voltage for an expected voltage difference between the first and second input nodes, and using the signal to cause the at least one comparator to place its output in an error state, and to charge the capacitor to the out of range voltage, ii) isolating the capacitor from the signal injector and voltage reference, and connecting the capacitor between the first and second input nodes such that the voltage stored on the capacitor is overwritten by the voltage difference between the first and second nodes, and iii) and reconnecting the capacitor to the comparator and monitoring the comparator's output.

摘要翻译： 一种包括自检功能的测量装置，所述电路包括电容器; 第一至第四开关; 测试信号注射器; 具有信号输入和参考输入的至少一个比较器，所述第一开关插入所述电容器的第一板和第一输入节点之间，所述第二开关插入在所述电容器的第二板和第二输入节点之间，所述第三开关 开关插入在电容器的第一板和比较器的信号输入端之间，第四开关插在电容器的第二板和电压基准之间，其中自检功能包括以下步骤：i）操作信号注入器 以产生表示第一和第二输入节点之间的期望电压差超出范围电压的第一信号，并且使用该信号使至少一个比较器将其输出置于误差状态，并为电容器充电 超出范围电压，ii）将电容器与信号注入器和参考电压隔离，并将电容器连接在第一和第二电容器之间 输入节点，使得存储在电容器上的电压被第一和第二节点之间的电压差覆盖，以及iii）并且将电容器重新连接到比较器并监视比较器的输出。