Trigger method based on RMS values, and digital oscilloscope

The invention discloses a trigger method based on RMS values, and a digital oscilloscope, and the trigger method is characterized by comprising the following steps of acquiring sampling data of a signal, wherein the sampling data comprises a plurality of data points distributed according to a sampling sequence; for any one data point of the sampling data, calculating the root mean square of the data point and the previous data points distributed to obtain corresponding RMS values; forming a trigger signal according to the corresponding RMS values of each data point in the sampling data, and generating a trigger even by using the trigger signal in a preset trigger mode; and outputting the trigger event. The application forms a trigger signal according to the RMS values corresponding to eachdata point, so that the RMS values before and after the trigger condition is met and/or the corresponding sampling data are saved for user analysis after the change trend of the RMS value meets the trigger condition, which e