Products > Test Equipment
Oscilloscope Zoom Out Quirk
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nctnico:

--- Quote from: Elasia on June 15, 2020, 01:48:38 pm ---Oh you mean split screen? Yeah they dont really do a good job of that either.. you just get the smaller horizonal box at the top you cant vertically resize to choose how much each pane is using

--- End quote ---
Yes, zoom mode = split screen.
Elasia:

--- Quote from: nctnico on June 15, 2020, 01:54:23 pm ---
--- Quote from: Elasia on June 15, 2020, 01:48:38 pm ---Oh you mean split screen? Yeah they dont really do a good job of that either.. you just get the smaller horizonal box at the top you cant vertically resize to choose how much each pane is using

--- End quote ---
Yes, zoom mode = split screen.

--- End quote ---

Eh.. the way it is now its hard to really call it split screen with independent timebases... their intent is more like the top is just a view finder from how it works as is but yeah thats something else that would be nice to have
2N3055:

--- Quote from: nctnico on June 15, 2020, 12:38:38 pm ---
--- Quote from: Elasia on June 15, 2020, 12:27:46 pm ---
--- Quote from: nctnico on June 15, 2020, 10:12:19 am ---Please read all of my posts on this topic. I have explained very clearly why and how zoom mode is NOT the solution. And if you think carefully about it then you'll also see that by using zoom mode to force the memory length you sacrifice the zoom function (delayed / dual timebase) as well. Also, don't get stuck in old grudges and be blinded by them (same problem Tautech has). Currently Siglent is missing a memory management feature which is easy to add and it seems they are working on it right now.

--- End quote ---
I know you keep saying it but what we are talking about doesnt even modify siglents UI zoom mode as it is.. im lost why you keep saying zoom is sacrificed?

I'm now using zoom mode as is and it works fine to zoom out and see more data on screen, i mean thats kind of its job right?  What do you think zoom mode is suppose to be? I'm a bit lost on that as well

--- End quote ---
In some cases you might want to look at a signal at two positions / different time bases (this is called dual timebase on analog oscilloscopes). With auto memory length the memory depth will be set to the amount needed to fill the screen with the longest time/div setting. However if you want to force the oscilloscope to use more memory you'll need to set the time/div longer. But in that case you likely won't be able to see the details in a signal. So without being able to manually force the memory depth you can use the zoom mode to force deeper memory OR see two parts of a signal at the same time. IOW: With auto memory depth you can't have both deep memory and see two parts of the same signal at the same time.

--- End quote ---

Honestly, I don't understand what are you saying.



How is this not dual timebase?  How is this not detail from bigger picture?
nctnico:
You choose an example in which you can still see both signals on an oscilloscope with very little memory. Set the bitrate to 1Mbit/s (100 times higher) with a much higher packet rate as well and try to do the same with the top zoom window set to 5ms/. You'll see a contigous colored band. If you set the zoom window to 50us/ in order to see the packets a Siglent scope will shorten the memory depth and there is nothing you can do about it. You have a choice between either having long memory but not being able to see the packets in the zoom window OR seeing the packets but not have deep memory.
2N3055:

--- Quote from: nctnico on June 15, 2020, 02:35:45 pm ---You choose an example in which you can still see both signals on an oscilloscope with very little memory. Set the bitrate to 1Mbit/s (100 times higher) with a much higher packet rate as well and try to do the same with the top zoom window set to 5ms/. You'll see a contigous colored band. If you set the zoom window to 50us/ in order to see the packets a Siglent scope will shorten the memory depth and there is nothing you can do about it. You have a choice between either having long memory but not being able to see the packets in the zoom window OR seeing the packets but not have deep memory.

--- End quote ---

No it won't. I showed you example from my Pico where I sampled 100 MPoints in 200ms and shown it zoomed in to 20ns /div, zoom factor of  1M X. Yes, one million times.
Tautech posted one image above, where he got 50 MPoints at 20 ms/div (200 ms total) and is showing details at 20 us/div.

This is how it works but you don't seem to understand. On main timebase you grab big chunk of data, and zoom shows a subset of that, in such a detail that is only defined by sampling rate. Which will be limited by memory size.

But zooming in won't change anything from how timebase and sampling is set, only what are you looking at.

So you enable 100 MPoints, set timebase to use all 100 MPoints, and you can zoom in to every single point...
And zoom will not shorten or change anything.

What are you saying is SIMPLY NOT TRUTH. Just look at the overwhelming evidence shown here..
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