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Siglent - 11/20 - New SDS1104X-U, 4 channel 100MHz, 1Gsa/s economy oscilloscope

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tttonyyy:

--- Quote from: QuitButton on June 18, 2021, 01:54:51 pm ---Have I got this right or am I missing something here?  Timebase of 2ns, I only get 28 samples. (or 14 or 7 with other channels on)

Is that the limit or anyway of increasing the number?

--- End quote ---

14 horizontal squares of 2ns = 28ns across the screen width.   So you have one sample per ns which is 1GSa/s, which is right.

The number is only increased by opening the wallet wider :)

QuitButton:
I'm probably not wording things right. My old Hantek somehow manages to display 800 dots from the 40 samples it takes at 2ns timebase. I guess its averaging even though it shouldn't be, or there's some basic difference in the operation between these models that I'm not understanding yet.



It also has an Equivalent-Time capture that the Siglent seems to be missing, which allows the creation of relatively useless captures like this one:



Edit: No, the 800 display dots is not just the width of the display...

QuitButton:
Can someone confirm what I'm seeing here isn't me going bonkers and its just "how things are"?

On my Hantek, at 2ns in Dots display I get this:



That's obviously a lot more than the ~28 samples it should be at 1GS/s so I'm guessing that either a) Hantek fill in the gaps (its not really "dots"  is it?), or b)  Hantek do more than one sample per single shot, or c) Something is happening that I don't understand.

Siglent give me this sort of display tt the same timebase:



I can though, get something close the Hantek's display by using Sequence capture on the Siglent, thus:



Is that what Hantek do?



bdunham7:
If you have more dots than mathematically possible during a single capture, the scope is overlaying multiple captures. 

tttonyyy:
That's the answer.  This only works with repetitive signals.  If you single trigger the scope you'll see the true reflection of number of sample points on screen.

Edit: there's a great explaination here:
https://uk.tek.com/document/application-note/real-time-versus-equivalent-time-sampling

Which is why one of your captures shows apparent noisey edges.

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