I said I understood it was a bug, but what real world measurement fails for you, that is my point? It's a nice anecdote; however, if you were really measuring low-level DC or noise in the low mv range, who would be setting the scale to 160V?
Of course, I could be wrong and this is certainly a nuisance, but I've found it's best to use equipment in ways that enhance its performance rather than in ways magnify its weaknesses. That is true for anything.
BTW, I think in single channel mode, the performance of the scope is outstanding, and that is why I think this bug is nuisance, because it certainly need not be this way.
I don't know if you for some reason refuse to read what I wrote or you're making fun of me...
![Laughing :-DD](https://www.eevblog.com/forum/Smileys/default/smiley_laughing.gif)
NO milivolts... Read again.. CH1 AND CH2 on 1V/DIV , probe connected only to CH1
NOTHING on CH2, disconnected, no probe connected...
RMS on CH1 2.07V, RMS on CH2 1.9V !!!
With nothing connected to the CH2 BNC.
![Banging Head |O](https://www.eevblog.com/forum/Smileys/default/bangheadonwall.gif)
CH2 with NOTHING connected to it measures cca 80% of whatever you are measuring on CH1 ( not flecking micro-volts, but 80 % of data from CH1.....
![WTF? :wtf:](https://www.eevblog.com/forum/Smileys/default/wtf2.gif)
)
That fails EVERY real world measurement criteria for that channel and particular RMS measurement.....
![ThumbsDown :--](https://www.eevblog.com/forum/Smileys/default/icon_thumbsdown.gif)
If I have NOTHING connected to CH2(no probe, BNC is empty), I can't have spillover from CH1 to CH2 of 1.9V RMS... That is 2 DIVs
![Face Palm :palm:](https://www.eevblog.com/forum/Smileys/default/facepalm.gif)
But is a serious thing if you need RMS... I can just measure on CH2 and CH3 as a workaround but it is a serous flaw anyways.. And I didn't buy 4CH scope to use it as a 1CH...
I could have gone with 2CH DS2000 series with just a little more money but I needed 4CH for the things I do...
So I want all channels to work normally.. Of course I will make do with it for the time being.. But it should be fixed eventually..
![Clapping :clap:](https://www.eevblog.com/forum/Smileys/default/clap.gif)
I don't want this to become an argument of a sorts. I'm persistent because you seem not to understand the problem, and despite your good will to help, you are talking about unconnected things..
I just want to untangle misunderstanding..
![ThumbsUp :-+](https://www.eevblog.com/forum/Smileys/default/icon_smile_thumbsup.gif)
All the best..