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SDS800x HD vs DHO800x FFT

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tautech:

--- Quote from: cyo3fff on July 15, 2024, 04:56:59 pm ---
Coming back to SDS824x HD, do you (or others) know if this scope has a similar smell (if you smell DHO804 you know what I mean by "similar smell")?

--- End quote ---
SDS800X HD units I have unpacked (~12 now) have no strong lingering smell other that what you get from new electronic devices.
Certainly nothing I consider offensive.

--- Quote from: cyo3fff on July 15, 2024, 05:11:19 pm ---
--- Quote from: tautech on July 14, 2024, 10:00:18 pm ---
There are many examples of FFT use here:
https://www.eevblog.com/forum/testgear/sds800x-hd-review-demonstration-thread/

--- End quote ---
I know the above thread. I could not see a speed comparison (how long it takes to compute and display the results) for a given FFT settings between SDS824x HD and DHO804.

If you find such post, please point me to it but please, if it is possible directly to the message, not the whole thread (with tens or hundreds of messages!)

--- End quote ---
As I have mentioned before, FFT sweep speed is related to the settings you use, just as they are for an analyzer.
Speed vs accuracy < pick your poison !
Today I may have a chance to do some tests.

tautech:
SDS814X HD FFT
A few assorted screenshots, all showing a 400 MHz span representative of you might use for EMI work.
Signal from SDG6022X, dual tone with the principle @100 MHz.

These results are only applicable to the scope settings in use. FFT 2Mpts remained unchanged although it's auto managed by the scope. Memory depth is just what it was, didn't check.
Higher FFT sweep speeds are likely possible if one takes the trouble to optimize them.

At 200us/div and max 2Mpts FFT a sweep speed of ~1/s is obtained.
100us/div = ~2/s
50us/div = ~4/s
As we increase only timebase the sweep gets faster where at 10us/div its speed is indiscernible and at 500ns/div detail is starting to be lost without changing other settings.

Max hold and Average screenshots thrown in for good measure.

All other settings should be plain to see in screenshots.

Fungus:

--- Quote from: tautech on July 15, 2024, 08:49:12 pm ---As I have mentioned before, FFT sweep speed is related to the settings you use, just as they are for an analyzer.

--- End quote ---

Yes, but one can still be slower than another.

Fungus:

--- Quote from: tautech on July 16, 2024, 04:38:59 am ---At 200us/div and max 2Mpts FFT a sweep speed of ~1/s is obtained.
100us/div = ~2/s
50us/div = ~4/s

--- End quote ---

Rigol is three or four times faster than that.

tautech:

--- Quote from: Fungus on July 16, 2024, 06:35:20 am ---
--- Quote from: tautech on July 15, 2024, 08:49:12 pm ---As I have mentioned before, FFT sweep speed is related to the settings you use, just as they are for an analyzer.

--- End quote ---

Yes, but one can still be slower than another.

--- End quote ---
Which one wise guy ?

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