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Siglent SDS1000X HD 12bit DSO's
ebastler:
--- Quote from: tautech on November 04, 2023, 08:21:12 am ---Why would we need a zoom mode for digital channels when they are a reconstruction of a pulse that meets a user set threshold. What we see on the display bears little resemblance to the digital waveform.
Much like a clock waveform, it matters little what it looks like providing it meets the required thresholds.
--- End quote ---
Zooming in on digital signals would mainly be used in connection with decoding, I expect, to make the decoded data readable when capturing longer messages.
--- Quote ---Lemme think about running some tests in the next few days....although it's the weekend I do have a bit on.
--- End quote ---
Thank you! No rush -- as the scope is not released yet, there is no immediate purchasing decision to be made. (Unfortunately... ;))
ebastler:
Tought about the "Zoom on digital data" limitation a bit more, after re-reading Performa01's summary (below). Since Zoom is available once the scope is stopped, maybe this is not a major limitation:
In Run mode -- assuming that messages are sent repeatedly -- I could always simply "zoom in" by switching to a faster time base and moving around via the horizontal delay, right? The only thing one loses is the visual orientation where one is currently looking within a longer message; but reading the decoded data should not be a problem.
Or am I missing something there?
--- Quote from: Performa01 on December 02, 2018, 09:20:30 pm ---Furthermore, both History and Zoom don't work when digital channels are enabled. Since most people want the MSO for decoding serial buses nowadays, this means you cannot decode long messages, because the decoder line at the bottom of the screen will become unreadable due to the lack of space. Using analog channels, you can easily deal with that by just entering zoom mode and take a closer look at the part of the message you're interested in. As it is now, when using digital channels you're almost limited to the capabilities of a Rigol 1000Z which only decodes the screen buffer anyway
The limitation described above only applies in run mode though. You can still capture a long message and then zoom in and navigate through the message while in stop mode. Also the list view works during Run even for very long messages, but that's rather pointless as you cannot closely examine the corresponding waveform – you might just as well use an LA instead.
--- End quote ---
tautech:
--- Quote from: ebastler on November 04, 2023, 08:55:37 am ---
--- Quote from: tautech on November 04, 2023, 08:21:12 am ---Why would we need a zoom mode for digital channels when they are a reconstruction of a pulse that meets a user set threshold. What we see on the display bears little resemblance to the digital waveform.
Much like a clock waveform, it matters little what it looks like providing it meets the required thresholds.
--- End quote ---
Zooming in on digital signals would mainly be used in connection with decoding, I expect, to make the decoded data readable when capturing longer messages.
--- End quote ---
Oh, a faster timebase setting is no problem, you can set to whatever you like.
By Zoom, I was thinking a split screen zoom. :-[
Performa01:
--- Quote from: ebastler on November 04, 2023, 09:18:59 am ---In Run mode -- assuming that messages are sent repeatedly -- I could always simply "zoom in" by switching to a faster time base and moving around via the horizontal delay, right? The only thing one loses is the visual orientation where one is currently looking within a longer message; but reading the decoded data should not be a problem.
Or am I missing something there?
--- End quote ---
Yes, you are. What you describe will not work for long messages that use protocols with certain start/stop conditions. If you have e.g. a long I2C message and you shorten the acquisition so that you only see a part of it - and the start condition is truncated - then the decoders won't work.
It will not be a problem for UART, as long as the acquired record includes at least one full character.
In general, it is not so much about zooming into a digital signal, which is indeed just a far cry from the real signal shape, but you might want to inspect some corresponding analog waveform sometimes. With digital channels activated when using the SLA1016, zoom doesn't work at all, neither for analog nor digital channels. And then there's the problem that you can read the messages only in the list window, but not directly below the signal.
As I've stated in some old posting, the SLA1016 is a fully independent acquisition machine with its own trigger mechanism, that is somehow synced to the DSO acquisition. Therefore I don't expect anything could have changed by now. LeCroy happened to have a similar soultion somewhere in the past, and it received equally little love by the users...
rf-loop:
Split window zoom is not possible when digital inputs are on.
Digital channels can not use for next triggers: Pattern (least now) and then of course not for Runt, Slope, Video, Window because signals have only two states.
Digital channels can use for Edge, Pulse, Interval, Dropout and Serial.
Analog and Digital serial decoding: Mixed analog and digital decoding is not supported. (signals must be from only digital or only analog, not mixed)
Sad that there is (as usually in most of these kind of instruments) also only two states 1 and 0. But undefined state is missing because we can set only one threshold level. or other parameters. So digital channels can not use for real analysis. Real circuit may decode or other way behave different than this kind of simplified "LA" displays.
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