Products > Test Equipment
Siglent SDS800 Zoom out question (problem?)
awakephd:
Thanks for the quick response! I had to chuckle - I asked if "anyone" would be willing to give me a hint ... and I got "Someone"! :)
electr_peter:
--- Quote from: Someone on October 07, 2024, 11:19:10 pm ---Share this secret knowledge for the benefit of everyone.
--- End quote ---
Keysight documentation is not up to your standard of details (w.r.t. zoom out question) because is in pieces over multiple sources, dosed in MegaZoom marketing, etc. I am not going to do research for you to miss-interpret it. There is more than enough info in this thread.
--- Quote from: Someone on October 07, 2024, 11:30:48 pm ---Alternative method you both seem to get defensive about: pretty much all scopes (including the ones you separate out) can achieve a comparable result by zooming in before capturing.
--- End quote ---
You constantly move focus in other direction rather than focus on the topic matter for once. Due to interruptions you don't see the point straight.
electr_peter:
--- Quote from: nctnico on October 07, 2024, 11:00:46 pm ---
--- Quote from: electr_peter on October 07, 2024, 10:41:22 pm ---Descriptions are in user guides, app notes, etc. (i.e. spread in parts all over the place). To be honest, no feature of a scope is described in detailed enough way (due to many reasons) to satisfy your needs or level of this thread. If you want all the details, do research yourself.
Official list of "zoom out" scopes doesn't exist. To my knowledge, "zoom out" is available on all Keysight InfiniVision models (X1/2/3/4/6k), the new HD3 and likely all older models with MegaZoom chip (including older ones from 1990s). Other Keysight series most likely not. Some say Rigol models also have "zoom out".
--- End quote ---
Having had quite a few DSOs from various brands through my hands over the past decades, I can say that all DSOs made by mainstream brands except for true Lecroy models (not the rebadges from Iwatsu) and some older Siglent models, can zoom out (capture beyond the screen if memory length permits). IOW it would be an extreme rarity to find a DSO which can't zoom out as it is as standard like having a voltage meter on a bench power supply. This has been explained in great detail and length in a previous thread which seemed to have been 'forgotten' by some. So it is better to create a list with DSOs which can't zoom out. It will be pretty short.
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"zoom out" has few flavors (described here). Many scopes have "zoom out basic" by setting (in auto or manual selection) memory size to capture beyond display. For scope to not even have "zoom out basic" is mind-boggling (for example, Siglent SDS800X HD and SDS1000X HD(?)). "zoom out plus" is a refinement for max performance (found only in MegaZoom scopes AFAIK).
electr_peter:
--- Quote from: Someone on October 08, 2024, 01:54:48 am ---
--- Quote from: awakephd on October 08, 2024, 01:23:45 am ---But if anyone would like to give me a quick hint or reminder - where can I select between the auto and fixed sample rate, and when would I want to?
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It is similar/related to setting the memory depth manually. For some captures you intentionally want fewer sample points, a common case is when offloading for later analysis. The scope can use its fast acquisition hardware to reduce the data to a suitable sample rate so that other systems downstream can operate faster.
You could also use it to manipulate the waveform update rate if that is something you care about.
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With Siglent SDS800X HD, press front panel button Acquire -> Memory Management settings -> [Auto] OR [Fixed Sample Rate]. [Auto] is for general use. Max Mem Depth value only matters for slow timebases - to get more data (at high sample rate) OR to speed scope (as low sample rate). [Fixed Sample Rate] is the same thing from a different angle, allowing to set sample rate directly for specific uses.
Always check bottom right corner for actual sample rate & memory status.
Someone:
--- Quote from: electr_peter on October 08, 2024, 03:01:54 pm ---
--- Quote from: Someone on October 07, 2024, 11:30:48 pm ---Alternative method you both seem to get defensive about: pretty much all scopes (including the ones you separate out) can achieve a comparable result by zooming in before capturing.
--- End quote ---
You constantly move focus in other direction rather than focus on the topic matter for once. Due to interruptions you don't see the point straight.
--- End quote ---
ha ha ha, OP literally asked if zoom out was some feature they would miss. How is suggesting an almost identical alternative moving the focus?
The OP repeated the misleading statement that:
--- Quote from: frank2644 on October 02, 2024, 05:21:27 pm ---Sure there are workarounds, like recapturing using a longer sweep rate, but I have found that annoying over the years.
--- End quote ---
Which is untrue, as a scope which cannot "zoom out" does not imply/mandate that the user must recapture. It is about setting the scope to capture what you want in advance. Same is true of any of the methods other than the bonus (undocumented, unreliable) feature which some Keysight models have.
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