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在测量强电平上迭加的瞬变微弱信号时,常采用手动调节补偿电平和电容隔直两种方法。本文分析了这两种方法的缺点,给出了一种测量精度高的电流自动补偿电路。该电路对强电流本身变化的补偿速度小于50s,可用于在示波器上观察大于1s/格的瞬变微弱信号。文中还给出了电路反应时间的数学分析和实际电路的细节。 相似文献
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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. 相似文献
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