Products > Test Equipment
Rigol MSO5000 HiRes mode
gf:
Interestingly, in the last few screenshots the reported standard deviation is even lower in normal mode than with hires! :-//
--- Quote from: Fungus on October 30, 2022, 11:21:05 am ---These two are very interesting. There should be a sharp dropoff in noise at the high end with Hires enabled.
All I'm seeing is a slight sag in the middle.
--- End quote ---
The 1GSa/s screenshot is the only one which shows a full 0...fs/2 spectrum, and the difference between normal and hires definitely does not look like the sinc frequency response of a simple moving average filter. Looks like hires were possibly implemented with a different kind of filter.
Anding:
20ns / division
Fungus:
--- Quote from: Mechatrommer on October 30, 2022, 12:05:20 pm ---if the noise bandwidth is way below this rate, say few KHz, then hope to destroy this noise in averaging (hi-res mode) is almost nill, ymmv.
--- End quote ---
If the noise is in the ADC then it's more likely to have extremely high bandwidth than be low frequency (in my unprofessional opinion).
In that case all the stuff we're seeing down low in the FFT would be aliasing of that VHF noise and hires mode would work perfectly.
Fungus:
--- Quote from: gf on October 30, 2022, 12:25:03 pm ---Looks like hires were possibly implemented with a different kind of filter.
--- End quote ---
A filter that does almost nothing.
switchabl:
--- Quote from: gf on October 30, 2022, 09:33:47 am ---Initially I'd only consider a timebase with the maximum sample rate.
In subsequent steps, slower timebases can be checked too.
--- End quote ---
If it works in a similar way to lower-end Keysight models then it will only average "extraneous" samples, so at full sample rate, high resolution should not do anything (new EXR/MXR models are different). I don't have a Rigol anymore unfortunately but as there is some common heritage and no explicit setting it would not surprise me.
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