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Rigol DHO804 Test and Compare Thread
iMo:
--- Quote from: Martin72 on November 28, 2023, 10:29:26 pm ---Working with the DS1054Z is like traveling backwards in time. ;)
I hadn't noticed this before, but now, with the DHO804 in direct comparison, I have to say:
Farewell and thank you for once arousing my interest in a private scope and fulfilling my wish to own one.
But your time is simply up, no one should buy you anymore, given the DHO800.
A small example of how it could not be more drastic.
50mV/div, then stop, then enlarged to 20mv/div.
As I said, time's up.
--- End quote ---
Hmm, what I see is the 1054Z shows the raw voltage (60 points with the steps), the DHO shows the sinc interpolation (through the 64 points). You cannot judge on the resolution based on that pictures, imho..
TurboTom:
I guess the engineers at Rigol confused the Flattop window function with the Tukey window which actually has a flat top in the time domain, maybe a language thing... Wouldn't worry too much about this since the most relevant window functions von Hann, Blackman-Harris and rectangular are available and appear to work correctly. A hint for using FFT on DHO scopes: don't use auto sampling depth but rather choose a fairly high number (at least at 1MPts the FFT still utilizes the full memory). Only if very fast FFT update rate is required at reduced available RBW, it makes sense to select less sample memory since Rigol's FFT engine is pretty fast anyway.
True, it's a pity that FFT avaraging isn't available (yet) -- Rigol should have included this instead of this color-grading FFT display nonsense (available on DHO1000 series, don't know if it's included in the DHO800 as well), but otherwise I don't find the FFT U/I too troublesome or unlogical to use. It's possible to get pretty decent results easily. And since sales for the anticipated high-quantity instrument range just started, we may actually see some reasonable firmware-polishing in future. At least I've still got some hope for this... ;)
ebastler:
--- Quote from: TurboTom on December 01, 2023, 11:15:28 am ---A hint for using FFT on DHO scopes: don't use auto sampling depth but rather choose a fairly high number (at least at 1MPts the FFT still utilizes the full memory). Only if very fast FFT update rate is required at reduced available RBW, it makes sense to select less sample memory since Rigol's FFT engine is pretty fast anyway.
--- End quote ---
I assume the DHO1000 has the same somewhat haphazard "RBW" indication as the DHO800 -- did you manage to figure out what it means?
I am not concerned with the precise naming (should it be "RBW", "resolution", "frequency interval" or whatever). But can you tie it back to the sampling rate and number of FFT data points in a systematic way? Does it depend on the choice of window function too? And what is the missing unit -- is it always Hz?
Thanks for your insights!
Martin72:
--- Quote --- Is there something in the FFT which you would like to adjust but can't?
--- End quote ---
Number of points for example, I'm used to being able to manually set the number of memory points (which are also not displayed on the rigol).
And RBW means resolutionbandwith, and the unit Hz is omitted on the rigol, depending on the situation, I didn't pay close attention to when this happens.
Fungus:
--- Quote from: TurboTom on December 01, 2023, 11:15:28 am --- color-grading FFT display nonsense (available on DHO1000 series, don't know if it's included in the DHO800 as well),
--- End quote ---
It is, and you can do it in multiple windows. :)
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