Abstract
Two methods, manual back-off and capacitor coupling (by cutting off the d.c. component) are usually used to measure a small transient signal superposed on a large electric current. The shortcomings of them 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.
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Dejiang, T., Xinyuan, L., Chunzhang, C. et al. The measurement of a small transient signal superposed on a large electric current. J. of Electron. (China) 1, 28–35 (1984). https://doi.org/10.1007/BF02824096
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DOI: https://doi.org/10.1007/BF02824096