Products > Test Equipment
A newbie needs some help with my first DSO
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Fungus:

--- Quote from: Martin72 on June 03, 2024, 09:23:43 pm ---Some people expect that...

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I think MOST people would expect that. That's why Dave was so surprised.


--- Quote from: Martin72 on June 03, 2024, 09:23:43 pm ---It is not without reason that the default setting for all scopes that I know across brands is “auto” as far as memory management is concerned.
And in this setting you can't look “behind” the screen and I bet 99% of the time you don't need to, otherwise it wouldn't be a default setting.

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 :-//

Here's a Rigol in "auto" mode. Visible/hidden memory is shown in a special indicator at the top of the window.

As you can see, the memory being captured goes far beyond the visible screen, both before and after. I'm guessing about seven screens either way in this example.


Someone:

--- Quote from: nctnico on June 03, 2024, 09:31:28 pm ---OTOH, there is no such setting on Keysight DSOs. You always get full memory for the last acquisition.
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Except not all Keysight scopes do that, which has been tested and found to not occur in your magic corner case. This is all brand and model specific.

It cannot be simplified down to every/all/universal. Your claims of "industry standard" are a joke when it's not the default even on the scopes that support it.
Someone:

--- Quote from: nctnico on June 03, 2024, 03:30:56 pm ---
--- Quote from: Someone on June 03, 2024, 10:21:14 am ---
--- Quote from: Fungus on June 03, 2024, 10:08:22 am ---
--- Quote from: awakephd on June 03, 2024, 12:23:56 am ---I am planning to test and experiment with the effectiveness of basic R/C de-bounce filters on various switches.
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Sounds like a perfect example of where the Siglent way is going to be a pain in the ass. You'll be forever zooming in to look at detail then forgetting to zoom out again to prepare the 'scope for the next capture.

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How many times do you want to post this crap? You're factually incorrect.

So why keep pushing a beginner, who asked for some clarity on the best way to use their scope, away from the way that scope is designed to be used?

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Actually the question was:

--- Quote from: awakephd on May 30, 2024, 02:06:03 pm ---The link to Dave's video was actually very helpful for me in making sense of what memory depth is. I confess that i was assuming it would work more like the Keysight, which is part of why I was having trouble understanding - I hit "stop," but there was no data past the end of the screen. I think I am now understanding that, for the Siglent and a few others, what is captured is only what fits on the screen at a given moment - thus, one must zoom out, capture, then zoom in to see detail. Right? Maybe?

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So there you have the proof you are so friggin' wrong in your thinking it isn't even funny, right in your face: people expect a DSO to capture beyond the screen because they find it useful. It is simple as that, like it or not. And yet you keep on going trying to push your limited view onto everyone. FFS  :palm:

The best way is what gets people to results in a way which suits them best. Imagine somebody coming along insisting you stand behind your desk while you prefer to sit on a chair behind your desk.

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You're taking the forced solution you pushed as a "win". I see that as a failure to educate the OP in the diversity of ways they could achieve the same result. Adding confusion to their mind instead of helping them understand the underlying concepts, which is where the question started.

There is no stopping and starting again. If you want to capture data around the trigger/magnified window then of course you have to set that before starting. With either method. So your communication has as I keep saying only added confusion and noise, no answered their honest questions.

Post truth world.
awakephd:
FWIW, I would hate for anyone to get too excited about what I might or might not have expected. I was expecting the waveform capture to start at the trigger point, so discovering that the scope captures all sorts of pre-trigger data was a big surprise. A very welcome, big surprise! :)
Someone:

--- Quote from: Fungus on June 03, 2024, 09:40:15 pm ---Here's a Rigol in "auto" mode. Visible/hidden memory is shown in a special indicator at the top of the window.
--- End quote ---
Here is a different Rigol model that in Auto mode keeps the memory depth equal to the visible window:

So, it is model specific and people need to learn how their specific unit works. Industry standard my foot.
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