Products > Test Equipment
Oscilloscope Zoom Out Quirk
2N3055:
--- Quote from: kcbrown on October 23, 2022, 07:18:04 pm ---...
I will say this: for single capture mode, it really should use all the available memory always. This is because the history buys you nothing, since each time you press the "single" button it'll clear the history, so the scope may as well use all the memory for the one capture you're performing. This is the one exception that Siglent should have made to the "what you see is all you get" behavior from the start. Either that, or it should remember prior captures as long as the capture parameters (timebase, trigger settings, etc.) remain the same.
--- End quote ---
There is a common scenario where history mode makes perfect sense even in single mode.
And that is when you are experimenting, you tweak something in your DUT (analog or digital) and take single capture, tweak few minutes, capture that ... Now you have 20 captures over 2 hours. You go in history mode and overlay them, measure, decode. compare..
You can save them for documentation if you want then.
I to do that on Picoscope all the time, now I can do it on both Pico and Siglents..
EDIT:
No you're right, it does not...
I must have confused it with something that was discussed..
Sorry!
2N3055:
--- Quote from: nctnico on October 23, 2022, 07:47:43 pm ---
--- Quote from: kcbrown on October 23, 2022, 07:18:04 pm ---Trying out posting in the Oscilloscope Zoom Out Quirk thread with quoted messages from a different thread, so as to retain all context while posting in the proper thread ...
--- Quote from: nctnico on October 18, 2022, 07:56:41 am ---
--- Quote from: 2N3055 on October 17, 2022, 09:07:43 pm ---There is no free lunch. There is no data being captured outside set time. It is only that you can set time by obscure mental calculation (flying blind and calculating sample rate/ manual memory length ratio) or by simply setting proper time base in a first place...
--- End quote ---
You keep on repeating this but it isn't true. In fact for many of the measurements I do, I don't even care about time/div setting. And in some cases (like verifying protocol bitrates which can be off by a factor 100) I don't even know which time/div setting I'd need to use to get the signal on screen.
--- End quote ---
Well, if you don't care about the timebase setting then that means you can set it to whatever setting gets you the maximum amount of time on the screen while retaining the scope's full sample rate (or to capture however much time you like), right? This means that, for these use cases at least, the Siglent approach will work just fine for you. What, then, is the problem?
--- Quote ---The deep memory simply makes sure there is always enough data. I make a measurement and twist the time/div knob until there is a visible signal. Then I use a measurement and / or cursors to tell me what I want to know. There is zero mental calculation and zero preparation.
--- End quote ---
OK, but you have to set the timebase to something. How do you set it on your scope so as to get the maximum capture depth while also retaining the sample rate you want?
--- End quote ---
You are overthinking it. Zen master says: 'Try not to find problems that aren't there'.
All DSOs except for the ones from Lecroy and some older Siglent models, allow at least to force full memory. And several offer an automatic mode.
--- End quote ---
They all do that, allow user to force full memory. Some with manual memory settings and all of them with timebase.
My gripe with you quest on this is that you make it sound like you cannot do it, and not that you like certain way of doing it and insist it is only "righteous way". It's not. Timebase and zoom is achieving same purpose. You don't like that, fine. But it is there and the rest of us just use that.
That is all..
Martin72:
--- Quote from: nctnico on October 23, 2022, 07:47:43 pm --- Maybe Siglent's change may also inspire Lecroy to rethink their memory management strategy.
--- End quote ---
I think it was the opposite, our newer lecroys from 2019 allowing to change between fixed memory or fixed samplerate - before siglent did anything in this direction.
Now you have it on the 2000HD, 5000 and 6000 models and AFAIK because of the "new" filter functions they got.
(This could be the reason why the 2000X+ didn“t get that)
Btw, I hate fullquotes... ;)
nctnico:
Where it comes to Lecroy my point of reference is their Wavepro 7k series. When I select a fixed memory depth on it, it treats that as the maximum memory. The actual memory length it uses, depends on the number of samples needed to fill the screen. IOW: it uses some kind of semi-auto mode which can be annoying at times. It is possible that Lecroy's newer software is more flexible where it comes to memory management.
Martin72:
More or less....
You really can choose only between fixed mem OR fixed samplerate, no auto mode.
Both, fixed mem and samplerate, can be adjusted.
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