So I'm watching a trace that is a bit jittery so it varies a bit from one trace to the next. Then I press the stop button and i would expect to see the last trace left on the screen, but in fact I see the last several traces. See video. What is going on here??? Rigol DS2072.
It works just af it is designed and made.
Think if oscilloscope capture example 10000 waveforms/s
Screen is refreshed example 25 times in second.
One screen can contain last 400 acquisitions.
Today scopes are very different if compare to old school museum digital oscilloscopes what do acquisition and after then put it to dislpay and then nexext acq. and then this new is writed to display and old flushed out.
Todays DPO type scopes works bit different.
Some oscilloscopes have selection for force oscilloscope to do this sequential acg...display...acq....display... as old slow digital scopes.
Example in Siglent there is default fast acquisition but user can also force it to slow. In this Slow mode there is only one acquisition for every TFT frame refresh. I am not sure if this can find also in Rigol.
But you can do it other way if you want only one last acquisition.
Use Sinle mode for triggering. when it trig it acquire and stop. Just one is displayed.
Other way
Use normal Normal mode (or Auto if not much experience with settings) for triggering and then adjust Trigger holdoff time to enough long so that it can trig only once for every TFT refresh. In this case when you stop scope there is one last acquisition visible.