An other way to check the resolution, per division,
Put scale to 1 volt/dev, with nothing connected just noise ( picture 1)
Press stop, and set scale to 20 mV (picture 2).
On 1 volt div, with 8 div and 200 levels, one level is 40 mV
On picture 2 you cansee that a sample was indeed 40 mV
Strange anomely, on picture 2 there are spikes above the trigger level,
but when switches to dots, there are no dots above the trigger level ( picture 3)
So it looks like that the DSO is calculating more noise then there is..?
@ Marmad, nice software developed. But i think more explanation is needed.