Products > Test Equipment

Oscilloscope Zoom Out Quirk

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rsjsouza:

--- Quote from: Elasia on June 11, 2020, 04:40:49 am ---No its classic chinese out of the box thinking... you leave it like that in the first place and set your zoom in to where you want it.. works fine in all modes, stop, single, trigger, auto

--- End quote ---
If Rigol, Owon and Uni-T did the same, I would agree with you there, but to me it looks like a classic second Tier brand copying thinking. I suspect LeCroy did that originally and Siglent followed suit.

(of course, you can always argue that the opposite is true as well: the other brands copied the top tiers Tek or HPAK)


--- Quote from: EEVblog on June 11, 2020, 07:40:34 am ---And that's the thing. For a scope not to offer the full memory for a single capture even when deliberately selected (without using a convoluted dual timebase system) is just silly.
The user needs to be able to chose how that memory is used, and Siglent/Lecroy/Picoscope are seemingly the only ones crippled in this regard.

--- End quote ---
I think that is exactly the crux of the matter. Since the manual memory depth setting is not translated to the capture itself, why have it in the first place? It seems a waste of memory when the user deliberately told the scope to use it.

BTW, the choice of doing the "Zoom In" approach does not immediately mean there is something wrong with it - after all, it is a design choice.


--- Quote from: nfmax on June 11, 2020, 07:45:56 am ---A question for anyone with a scope that has the 'history' mode:

Does changing the settings between triggers, e.g. changing vertical or horizontal scale, or enabling an additional channel, clear the history buffer? If not, do such changes get reflected in the on-screen display of the settings, when reviewing history?

--- End quote ---
If I understood it correctly, you mean in Run mode, right? If so, the buffer is discarded when enabling channels on the Rigol DS4014 and I would expect so, given the memory is split between pairs of channels.
In stop mode you can change the vertical and horizontal settings without a problem.

nfmax:

--- Quote from: rsjsouza on June 11, 2020, 10:45:24 am ---
--- Quote from: nfmax on June 11, 2020, 07:45:56 am ---A question for anyone with a scope that has the 'history' mode:

Does changing the settings between triggers, e.g. changing vertical or horizontal scale, or enabling an additional channel, clear the history buffer? If not, do such changes get reflected in the on-screen display of the settings, when reviewing history?

--- End quote ---
If I understood it correctly, you mean in Run mode, right? If so, the buffer is discarded when enabling channels on the Rigol DS4014 and I would expect so, given the memory is split between pairs of channels.
In stop mode you can change the vertical and horizontal settings without a problem.

--- End quote ---

Presumably you have to be in Stop mode anyway to look at the history?

tv84:
I think they had already developed the whole architecture when they decided to put a history button...  :-DD

"Uhmm, what about putting a history button in this free space over here?"

Why if it's always in history mode? ?  :palm:  :palm:

Siglent's 200 Mpts: "We have plenty of storage space in this server. But it's all tapes..."

JPortici:

--- Quote from: EEVblog on June 11, 2020, 05:46:52 am ---
--- Quote from: JPortici on June 11, 2020, 05:39:38 am ---Also the way LeCroy has always operated and the way Picoscopes have always operated.
Why do i have to keep telling people this?
--- End quote ---

That doesn't make it right.
Here is the thing. If you want to look at a short timebase signal then you'll set a short timebase, that's normal oscilloscope usage.
Even on a Siglent, Lecroy or Picoscope, you aren't going to go through to convoluted process of setting a slow timebase and then chosing the zoom mode and then setting the secondary timebase just for regular use.
The point is that when using the scope the normal way, you can't zoom out if you need to.

--- End quote ---

I removed the message because i though about it twice and didn't want to have this argument again.
There is nothing wrong in one or the other. Both have edge cases. End of story.

It doesn't make it wrong either.
It doesn't make it some weird ass chinese blah blah  (not sure if i have understood that post correctly though)
Granted i've been using scope for just 10 years and had the chance to use everything available with reasonable price, but i like the lecroy way better, about many things. Don't care about zoomout because i can always reproduce the shot (don't care about other what if i had zoom out bullshit, i can guarantee you that at some point you would have wanted more memory so the acquisition is useless) instead i care more about automatic history mode with LOTS of acquisitions

JPortici:

--- Quote from: nfmax on June 11, 2020, 07:45:56 am ---A question for anyone with a scope that has the 'history' mode:

Does changing the settings between triggers, e.g. changing vertical or horizontal scale, or enabling an additional channel, clear the history buffer? If not, do such changes get reflected in the on-screen display of the settings, when reviewing history?

--- End quote ---

Usually, yes. (Picoscope, Lecroy and siglent that i've used) It can be a pain but you get used to it. I think it depends on how the scope performs operations on the data (assumes current v/div for calculation, memory per channel and so on)

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