Hi NE666,
yep I actually bought an DHO924 for our company. I was attracted by the size of the unit and the proposed feature set.
And still I am thrilled about the feature set it can do. The serial decoder is really nice and throws in the decoded pattern while the unit is triggering on a signal. Awesome!
Working for a long time with a HP/agilent 54622D I really love to have both analog and digital in one unit.
So I was really shocked when I tried the logic analyser in the DHO924. Using the logic analyser even for slow timebase was something that I would take for granted, and there is also no comment in the products data sheet that the function of the LA is limited whatsoever.
Reading through the DHO900_UserGuide_EN I fould this however in sect 7.6 Roll Mode:
OFF: the Roll mode is disabled. The oscilloscope operates at slow sweep speeds
when the horizontal scale is 200 ms/div or slower. The slow sweep mode is not
available for digital channels.
![Face Palm :palm:](https://www.eevblog.com/forum/Smileys/default/xfacepalm.gif.pagespeed.ic.EBDwh1hCfo.png)
I have written to Rigol already. They have already confirmed a bug for switching LA on/off. Which will re-enable all channels. Even if you just want to use 4 signals.
So I am anxious to get a reply from them.
For my last debugging I borrowed a colleague's MSO8204A which is a bit oversized regarding speed. But it worked fine also in slow timebase mode. I could record for several secs and then analyse PWM ratio and the analogue output signal.
The software on the MSO8204A feels a bit crusty compared to the DHO. The latter is more responsive. So I am hoping that RIGOL is going to work on the firmware.
But it seems there are few updates.
![Embarrassed :-[](https://www.eevblog.com/forum/Smileys/default/xembarrassed.gif.pagespeed.ic.zcm3EmNu9T.png)
There is the electronica fair in Germany in November.
If I do not get a reply from Rigol I might take my unit and some glue and bond myself to the floor of their booth...
![Evil >:D](https://www.eevblog.com/forum/Smileys/default/xevil.gif.pagespeed.ic.tdrs7Uj5gu.png)