基于微分电路的频率/直流电压转换原理的频率测量计

The frequency measuring instrument of frequency translating into DC voltage based on differential coefficient circuit

根据正、负脉冲对电容的冲放电原理,提出了一种以被测信号电压在一个周期内对微分电路进行正向与反向冲放电,使电容上的电荷平衡,从而使被测频率线性地转化为直流电压的方法,从而达到测量频率连续变化的目的。提出了频率测量数学表达式及测量方法误差表达式。给出了测量电路硬件图及软件程序框图。

Based on the principle of charging and discharging on a capacitance, a measuring method which if a AC voltage signal measured is charged and discharged on coefficient circuit in its periods and the charge on the capacitance is zero, a linear transform were produced between the frequency of the measured AC voltage signal and a DC voltage is advanced .a mathematics expression of measuring frequency and its formula of measuring error are put forward. The Hardware circuit of its measuring method and the software frame of its measuring method are designed.