Today I´ve played around again with the stb-3 demoboard.
And again, I was pleased about the nice display of the siglent, but couldn´t get a better pic to show how good or much better it is in comparision to the rigol 5000..
For the decoding, I took the UART demo.
It seems it decodes from the memory, not from the screen.
Pic was taken at a timebase of 200ms, if you decrease the memdepth from maximum to say 100kpts, errors occuring.
Back to full memdepth, pressing "stop" and zooming in, it decodes as well as if it´s in "run" mode.