One of the things to look out for is to see whether an oscilloscope decodes the entire memory or only what is on screen. I don't know if Siglent still only decodes what is on screen or whether they have fixed this. A work-around is to use the zoom function (as Tautech shows) on the Siglent scopes but that eats away part of the screen.
Nctnico,
for some time now I've been meaning to ask you what do you mean by "decode entire memory"?
Let's take single shot mode.
Scope takes a sample that is a time length of screen. There is no data before or after what is on the screen. I don't need data before or after what I instructed scope to capture, perfectly aligned to trigger event. Screen is entire memory. In segmented mode, there will be several such screens each complete memory for that captured segment. Also each segment aligned around it's trigger even, as instructed.
So if I wan't to grab 100 ms worth of data, I set scope to grab 100 ms worth of data. There are 10 SPI packets in there for instance. I open table decode view and I see all of them. In graphic decode, I don't se anything, it's too small. So I zoom in to individual packet, and I also see graphic decode for the zoomed portion, together with full table for the whole capture.
Good decoders will be able to handle when you zoom in to two partial packets, and will show correctly decodes for only portion of packet on the screen.
This is something that didn't work on Rigol DS1000Z. It would properly decode in the table long full screen of data, but as soon as you would zoom in on portion, it would only decode zoomed in part like the rest of the buffer didn't exist. Also decodes didn't work for segmented memory.
That is a bad implementation, absolutely agree.
But that was only 1000Z. Other Rigols (2000, 4000) this worked well. I don't know, but Siglents shouldn't have that problem either.
Is that what you mean?
Or you are referring to how with Keysight , on a stopped capture, if you change timebase after capture, it still shows a full table decode for whole captured initial screen, although you are showing only portion of capture? That is pretty much equivalent to using zoom, but without overview window. no, wait, that is exactly the same thing as using zoom without overview window.
I could see it being useful to optimize screen usage, but to me using zoom has advantage that i have zoom overview window so I know where I am in the capture.
Regards,