What is the purpose of such "tests".
If the purpose is entertaining, yes, that's fine.
![Wink ;)](https://www.eevblog.com/forum/Smileys/default/wink.gif)
For example, the measurement of rise time without a flat top is... all know..
Then Rigol noise is measured using AC RMS but Siglent noise is measured using (True)RMS.
For compatability, Siglent noise measurement need use Stdev measurement instead of (True)RMS because true RMS also include DC offset. In Siglent, Stdev is for measure "AC" RMS. (In practice there is always some DC offset in system what is included in RMS)
Btw, the SDS800 frequency response FFT image ... is ... an analog filter before the ADC, but then (obviously
![Wink ;)](https://www.eevblog.com/forum/Smileys/default/wink.gif)
) there is also a digital filter after the ADC. (it can also see and deduce from that FFT image, because this BW shape would not be possible (at least in practice) to do it in the analog front end of an oscilloscope... see this bw shape)
Let's return back to these and many others when can release real, carefully and somehow seriously made real tests what meet the basic requirements.
Thanks for these pictures though. They were quite entertaining and funny.
![Cheesy :D](https://www.eevblog.com/forum/Smileys/default/cheesy.gif)
I wish a merry and happy Christmas!
![Smiley :)](https://www.eevblog.com/forum/Smileys/default/smiley.gif)