Afterglow display mode. It is the afterglow display mode in oscilloscope. Afterglow display is the superposition display of all waveforms that have appeared on the screen in a certain period of time. I can set the afterglow display time on SDS 1202X oscilloscope. When the afterglow time is set to infinity, turn on the afterglow display mode, and all waveforms that have appeared in the screen history will be displayed. This function is very convenient to see some waveform burrs.