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Siglent SDS1000X HD 12bit DSO's

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2N3055:

--- Quote from: dophuc on May 18, 2023, 07:39:34 am ---Sorry but I'm curious what measurements make you worried about interference by wifi ? :)

--- End quote ---
Depends. Most of the time it's not important. But sometimes you are measuring something low level. Or fighting some EMC problem...
Or simply verifying how instrument performs.. You might have seen discussions here about spurs and noise floor levels on scopes and SA for instance....

Martin72:

--- Quote ---In short, it will have same FFT as 2000X HD.
Also same 4 math ch,... So 4x2Mpts FFT at the same time.
--- End quote ---

Hmm....
As one of the "first" who wanted to have four channels, I should be lucky they will come(and I am.. ;) )
But I remember that it was not yet an issue with the 2000X plus, for performance reasons.
That is why the Siglent/lecroy models up to the wavesurfer 4000HD do not have four math channels.
Now it should be possible...
The HD goes with 2 FFT simultaneously already noticeably down in speed - And then four.....I'm curious whether the developers could still optimize something, so that the performance does not completely collapse in such a case.

tautech:

--- Quote from: Martin72 on May 18, 2023, 08:59:04 am ---The HD goes with 2 FFT simultaneously already noticeably down in speed - And then four.....I'm curious whether the developers could still optimize something, so that the performance does not completely collapse in such a case.

--- End quote ---
Yes it can need some horsepower.....although you/we are in control so if results are slow coming it is easy to make adjustments to FFT depth and/or main memory depth.
The trade off is fast or precise results just like we can do with Bode Plot. (# points)

The designers/engineers give us the tools but then it is up to us how to best use them.  ;)

rf-loop:

--- Quote from: Martin72 on May 18, 2023, 08:59:04 am ---The HD goes with 2 FFT simultaneously already noticeably down in speed - And then four.....I'm curious whether the developers could still optimize something, so that the performance does not completely collapse in such a case.

--- End quote ---

Here is one example (SDS1000X HD).
3.665MHz carrier. Modulated with 1kHz and modualtion depth 2% (sidebands -40dBc)
All 4 FFT simultaneously with same settings. Input only to CH1 (F1)
4 FFT's all have 2Mpts  (Δf 3.97Hz)  And as can see "RBW" is 14.82  (flattop window in use)  (time domain t/div is 50ms/div)
(note that time domain decimated samplerate is 50MSa/s  and FFT samplerate 8.33MSa/s  (1:6)

Yes, processing takes time...just for example, this FFT window update period is 6.8s but time domanin acquisition / trigger in this case around 1s.
Slow for one is fast for some other. Also there is not free lounges.



But then, lets keep some just for fun..

Now there is full span 0- 4.167MHz. I will try with SA... there is not available just same RBW but with 30Hz RBW  127s and with 10Hz RBW  394s.
So what is slow and what is fast..

But naturally if set SA (SSA3021X)  for 10kHz span and 10Hz RBW it is faster. Around 1s. Naturally due to its working principle. (in this case its FFT "sweep" handle 4pcs 3kHz slices, 262.348ms each one))

Martin72:

--- Quote from: tautech on May 18, 2023, 09:16:17 am ---Yes it can need some horsepower.....although you/we are in control so if results are slow coming it is easy to make adjustments to FFT depth and/or main memory depth.
The trade off is fast or precise results just like we can do with Bode Plot. (# points)

The designers/engineers give us the tools but then it is up to us how to best use them.  ;)

--- End quote ---

And if that's not enough, we'll buy another scope from someone who can. ;)



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