Signal mutation detection method applied to waveform averaging function of oscilloscope

The invention discloses a signal mutation detection method applied to a waveform averaging function of an oscilloscope, which comprises the following steps: inputting an input signal into the oscilloscope, measuring the signal-to-noise ratio of the input signal after the waveform is stably displayed, and then comparing the signal-to-noise ratio with a preset signal-to-noise ratio; and judging whether the input signal is abruptly changed or not by using a difference sum method and a counting method according to the comparison. 本发明公开了一种应用在示波器波形平均功能中的信号突变检测方法，将输入信号输入至示波器，待波形稳定显示后测量输入信号的信号信噪比，然后与预设的信号信噪比进行比较，根据比较的大小分别使用差值之和法和计数法来判定输入信号是否发生突变。