目前广泛使用的采样式测频法,实际上是测量被测频率在采样周期内的平均值,其分辨率不可能做得太高。本文提出一种连续式测频法,它可以连续显示被测频率的瞬时值,精度和分辨率都可以做得很高。文中介绍了这种测频方法的原理,主要逻辑线路和参数的选择。 Currently widely used sampling frequency measurement method is actually measured the measured frequency in the sampling period average, the resolution can not be done too high. This paper presents a continuous frequency measurement method, which can continuously display the instantaneous value of the measured frequency, accuracy and resolution can be done very high. This article describes the principle of this frequency measurement method, the main logic line and the choice of parameters.