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Rigol DHO804 Test and Compare Thread

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Martin72:
You wouldn't be so much in the dark if there was something like this - and it can't be difficult to implement.
But so far I haven't seen a Rigol that does it, neither expensive nor cheap.

Mechatrommer:

--- Quote from: Performa01 on December 02, 2023, 08:03:42 am ---When trying to sound smart, people should at least post correct information.

That includes not using points and bins as synonym first, and making contradicting statements later by (accidentally?) stating something that sounds right, namely that FFT bins are half the FFT points.

One should also not confuse frequency step (df) with resolution bandwidth (RBW).

One should also understand the vast difference between a traditional swept SA and the FFT on a DSO – or even a combination of both to form a powerful realtime SA…

When in doubt, one can always look up the fundamentals in this old post (reply #23):

https://www.eevblog.com/forum/testgear/rohde-schwarz-rtb2002-vs-siglent-sds2104x-plus/msg3239832/#msg3239832


--- End quote ---
i may mixed up / confusing what a specific DSO brand refering to "FFT points" (sampled points? or bin points? i dont own "THAT brand" DSO) but... what a waste lengthy talk about -3dB points of FFT Windowing function that looks like smart but in fact a "more than necessary" a complicated misinformation... better refer to "known brand"'s definition, than one guys' own definition from an unknown location ;) cheers...

https://www.analog.com/en/design-center/glossary/frequency_bin.html
https://dsp.stackexchange.com/questions/26927/what-is-a-frequency-bin
https://www.ap.com/technical-library/more-about-ffts/
https://www.ni.com/docs/en-US/bundle/ni-rfsa/page/nirfsa/resolution-bandwidth.html

there is NONE talking about WINDOWING function relating to this...

https://googlethatforyou.com?q=fft%20bins
https://googlethatforyou.com?q=resolution%20bandwidth%20fft

gf:

--- Quote from: Mechatrommer on December 02, 2023, 10:18:43 am ---i may mixed up / confusing what a specific DSO brand refering to "FFT points" (sampled points? or bin points? i dont own "THAT brand" DSO) but... what a waste lengthy talk about -3dB points of FFT Windowing function that looks like smart but in fact a "more than necessary" a complicated misinformation... better refer to "known brand"'s definition, than one guys' own definition from an unknown location ;)

--- End quote ---

FFT and window functions are pure math - nothing brand spacific. The term "RBW" comes from spectrum analyzers, and there it means the -3dB bandwidth of the spectrum analysis filter. Anyone familar with spectrum analyzers associates RBW with this bandwidth.

Martin72:

--- Quote ---If we distrust the numbers displayed on the screen, ist it possible to export the FFT math trace to a text file?
--- End quote ---

Directly from the FFT menu not, only the peak/marker table.
But I'll try another thing, maybe that works.

Mechatrommer:

--- Quote from: Martin72 on December 02, 2023, 10:09:30 am ---You wouldn't be so much in the dark if there was something like this - and it can't be difficult to implement.
But so far I haven't seen a Rigol that does it, neither expensive nor cheap.



--- End quote ---
if you are depending on that figure, then good for you, you dont have to know formula... (my program also provides such figure) i know rigol is a bit behind in this, but now its catching up... "the traditional way", which somehow bring back nostalgic emotion.. but please dont argue smart like some people.. only providing own's definition without being backed up by industrial name's definition. cheers.

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