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Oscilloscope Zoom Out Quirk
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2N3055:

--- Quote from: EEVblog on May 09, 2020, 12:31:56 am ---
--- Quote from: tautech on May 09, 2020, 12:25:07 am ---Yet it's arguably DSO user error when any capture is required that an appropriate timebase was not previously selected.

--- End quote ---

No. I'm talking about legitimately setting the timebase to capture the thing you wanted, no user error. Then perhaps you saw something unexpected and though "gee I wonder what happened before or after that".

--- End quote ---
I understand what are you saying, but when working on, say,  CAN bus, what are the chances you will happen to capture exactly packet with error if you looking at single edge? You don't capture that way looking at that kind of data. You use larger time period, with hundreds of packets and then search and scroll and zoom in and out.

As I say, it is not something I would forbid on a scope. But I don't rely on it, and try to avoid to rely on it. Instead I simply try to capture larger deliberately and be sure I got the data. And you can have a detailed look at a detail both ways...
EEVblog:

--- Quote from: 2N3055 on May 09, 2020, 12:38:10 am ---I agree it's worthy of a video. And if you think about it a bit further, you  will see that its one of those "you can do it this way too if planets are aligned..." but not really something to rely on.
--- End quote ---

You do know it's entirely predictable, right? (based on timebase and memory depth) It's not some random quirk.
Even the Keysight has a new Digitizer mode that makes it entirely predictable.
EEVblog:

--- Quote from: 2N3055 on May 09, 2020, 12:46:59 am ---
--- Quote from: EEVblog on May 09, 2020, 12:31:56 am ---
--- Quote from: tautech on May 09, 2020, 12:25:07 am ---Yet it's arguably DSO user error when any capture is required that an appropriate timebase was not previously selected.

--- End quote ---

No. I'm talking about legitimately setting the timebase to capture the thing you wanted, no user error. Then perhaps you saw something unexpected and though "gee I wonder what happened before or after that".

--- End quote ---
I understand what are you saying, but when working on, say,  CAN bus, what are the chances you will happen to capture exactly packet with error if you looking at single edge? You don't capture that way looking at that kind of data. You use larger time period, with hundreds of packets and then search and scroll and zoom in and out.

--- End quote ---

You can't say you understand what I'm saying then immediately go into an example where it's not going to be of value. That is completely opposite to my point!
I'll repeat, there is no logical argument you can make to say that this isn't a potentially useful feature in some circumstances.
stafil:
Doesn't capturing data outside the display window => more time to capture data => less waveform updates per second?
nctnico:

--- Quote from: stafil on May 09, 2020, 01:03:03 am ---Doesn't capturing data outside the display window => more time to capture data => less waveform updates per second?

--- End quote ---
Yes, but for capturing events which occur at a relatively low rate that doesn't matter at all.
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