论文部分内容阅读
Two methods,manual back-off and capacitor coupling(by cutting off the d.c.component)areusually used to measure a small transient signal superposed on a large electric current.The short-comings of them are analysed and an automatic current back-off circuit with high accuracy is describedin this paper.The response time of this circuit needed for compensating a sudden change in thelarge electric current is less than 50 microseconds.The described circuit can be used for the time scalefrom 1 microsecond per division upward on an oscilloscope.Mathematical analysis of the responsetime of the circuit is presented and a practical circuit is also given in detail.
Two methods, manual back-off and capacitor coupling (by cutting off the dccomponent) areusually used to measure a small transient signal superposed on a large electric current. The short-comings of which are analysed and an automatic current back-off circuit with high accuracy is described in this paper. The response time of this circuit needed for compensating a sudden change in the large electric current is less than 50 microseconds.The described circuit can be used for the time scale from 1 microsecond per division upward on an oscilloscope. Mathematical analysis of the response time of the circuit is presented and a practical circuit is also given in detail.