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The digital tachometer circuit, its principle is different from the pulse counter-type instrument, is described in this paper. In the circuit, input pulse is converted into DC voltage proportional to the input pulse by FVC. The test result is displayed by DVM. In the paper, the principle of FVC is discussed in detail, the over-all unit circuit is analized and the test result is given at last. 介绍了一种其电路原理与脉冲计数式仪表不同的数字转速表电路。它将输入脉冲经频率一电压转换器(PVC)变换成与之成正比的直流电压,采用数字电压表显示测量结果。文中详细地论述了FVC的工作原理,分析了整机电路,最后给出了实验结果。 This article explains the circuit design and working theory of figure-showing tachometer of engine. It separates broadens and photoelectricity isolates the firing pulse according to proportional relationship of rotating speed and firing pulse frequency and the rotating speed is shown on frequency counter. 本文阐述了发动机数码显示转速表的电路设计及工作原理,它根据转速与点火脉冲频率的比例关系,将点火脉冲进行分离、拓宽和光电隔离,在频率计上显示当前发动机转速。
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