Also thanks for the breakdown Performa01, that's honestly a lot more impressive than I was expecting from this sort of scope. That helps explain why it's so popular and everyone is rebadging it...
Well, since G0HZU was referring to the (much) more expensive 12-bit SDS2000X
HD, my demonstration was for that scope.
But no worries, the 8-bit SDS2000X Plus has an equally well designed low-noise frontend and its total noise is only marginally higher because of the 8-bit acquisition. The claim that it stays below 80 µVrms at full bandwidth (570 MHz) is still true for this scope.
Of course there are still measures to get rid of most of the remaining noise, depending on the application, like input bandwidth limiters 20 MHz, 200 MHz and/or 10-bit mode, which also limits bandwidth to 100 MHz.