一种基于示波器信号叠加功能测量频率的新方法

A New Method to Measure Frequency based on Signal Superposition Function with Oscilloscope

当正弦信号A频率是正弦信号B频率的N(N为正整数)倍时,二者的叠加信号C的周期与信号B的周期一致,且C的一个周期内包含N个波峰。根据此原理,选择B信号作为频率可调谐已知信号,设置示波器以B信号输入通道为触发源选项,根据稳定叠加信号C一个周期内波峰的数量推算出未知信号A与已知信号的比值,结合B信号频率值,最终获得未知信号A的频率值。

When the frequency of sine signal A is N（ N is a positive integer） times larger than tnat of B period,the superposition of the two signal C and the signal B have the same period,and C has N wave peaks in one cycle.According to this principle,we select the B signal as a frequency tunable known signal. B signal input channel was set as the trigger source option.The ratio of the unknown signal A to the known signal is calculated according to the number of peaks in the period of the stable superposition signal C.Combined with the frequency value of B signal,the frequency value of A is obtained.