Products > Test Equipment
SDS800X HD - Issue disscusions - is it me, or the scope?
eTobey:
It might be a good idea, to discuss issues that user have, firstly here, instead of the bug and feature topics, as they may not belong there.
Features topic:
https://www.eevblog.com/forum/testgear/sds800x-hd-bugswanted-features/
Bugs topic:
https://www.eevblog.com/forum/testgear/sds800x-hd-bug-reports-firmware/msg5455364/#msg5455364
The first few posts may not seem to fit to the title of the topic, as it was changed later on!
eTobey:
Suggestion:
When choosing a new measurement (clicking on an existing one) there is one selected, that is already used. One would think that you actually could deselect this, or changing the sources would affect this very measurement. (see picuture).
It can be activated, if you select the one that you actually opened.
Suggested solution:
Differentiate between measurments that are used for the particular channel/s, and the measurement that will be currently changed/activated.
eTobey:
Minor measurement issue:
In more or less extreme circumstances, the measurements become unreliable. How could one know, that he has gone to far?
As the gate cursors do really stick to the curve, it is quite confusing that they dont, when zooming pretty far in.
The measurements become wrong too, when zoomed out a fair bit!
ebastler:
As mentioned in the bug thread, I'm afraid the video is not helping me to understand the problem. It is also very blurry; I can't really see anything beyond the fact that you appear to be changing the timebase. ::)
Could you please elaborate?
- What are you trying to measure?
- What settings are you changing?
- Which traces/cursors/values should I be looking at, at which timestamp?
- How is the behaviour of that trace/cursor/value different from what you expect?
A still screenshot or two are probably better to illustrate the issue, together with the above information. In those you can show the relevant time points (only), and the quality will be much better.
Thanks!
ebastler:
Thanks for the sharper video. I may still misunderstand what you are concerned about, but I believe it is about two separate issues:
(a) The position of the gate cursors is obviously limited to the time window shown on the screen. So when you zoom far in (100 µs/div and faster in your example), the cursor positions get "clipped" to the screen boundaries. This makes sense to me -- after all, you set the cursors because you want to measure in specific sections of the signal, based on your visual observation of the signal. So why should they be set somewhere out of sight?
(b) When you zoom far out (50 ms/div and slower), the "green" measurement values, i.e. the inter-channel delays, are no longer correct. At 50 ms/div they are not measured at all; at 100 and 200 ms/div they come back, but are incorrect. I find that unexpected too, since the scope supposedly makes all measurements in its full-resolution data buffer, so they should not change. (And the CH2 width measurements in fact don't change.)
In summary, I see no issue with (a), and an unexpected behaviour -- although not highly relevant in practice -- with (b). And I would love if you could describe such issues similar to what I tried for (b), rather than letting me stare at a video and take my best guess... ::)
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