I would like to see the refresh speed of the FFT in comparison to the 3000x at a few different settings.
Thanks!
That is going to be hard, because on HD3 (like on R&S scopes) you don't really have all the settings under manual control in a classical FFT sense.
You can get some particular RBW with different windows, sample rate and bin size.
What could be done is to set HD to few different setups, and then trying to provide similar
results on SDS3000xHD using it's controls.
For instance, in video, I saw that Dave set HD3 to 3,2GS/s, 128kpts of samples, FFT with 24.4kHz bin size. That is 3.2GS/s divided by 2^17, so 128k of FFT bins.
So I set similar on Siglent: 4 GS/s, 200kpts, FFT to 128k bins, and got 30,52 kHz bin spacing.
At these settings (and some measurements on), speed was very much the same as HD3. Enabling 4x averaging did not slow things down. With measurements off, it is slightly faster visually, visibly but nothing I would call large improvement.
Taking into account that it does process a bit more data (and internal data path is 16 bit anyways) I would say that at these settings SDS3000xHD processes FFT bit faster.
It could be that HD3 in comparison is faster or slower with smaller or larger number of bins and amount of data to process. Until thoroughly tested we won't know.
This preliminary simple comparison shows that HD3 and SDS3000xHD are definitely in the same class in this regard.
I would personally be cautious to do some "in depth" testing right now, though.
Despite all the enthusiasm and pomp, HD3 was released in
unfinished state..
I would let Keysight feature complete the product and sort it out a bit before testing it in it's actually finished state...
Any testing now could produce overly optimistic (maybe it is fast now but after some debugging they have to implement more safe/slower code) or pessimistic (they find a way to optimize some process yielding faster processing) results.
We have all seen this before, with Keysight, R&S, Siglent....
To say it colloquially, what we have now, what was released, is extended film trailer/teaser not the actual film yet.
Featuring good actors, good filmmakers, from good studio, meaning it
should be good.
But I will wait for full premiere to actually pass judgment.