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Rigol MSO5000 HiRes mode

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Fungus:

--- Quote from: Anding on October 30, 2022, 11:14:51 am ---Repeated measurements





--- End quote ---

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.

Anding:
1GSa/S


Fungus:

--- Quote from: balnazzar on October 30, 2022, 11:19:52 am ---I'm not understanding why hires seems to do nothing at mitigating the scope's self noise...

--- End quote ---

Yep. The math is simple.

This is what hires mode should do:


If the MSO5000 doesn't do that at least resembles that then something is wrong.

Mechatrommer:

--- Quote from: balnazzar on October 30, 2022, 11:19:52 am ---I'm not understanding why hires seems to do nothing at mitigating the scope's self noise...

--- End quote ---
its a bell and whistle after the signal path, like averaging... so take it as what it is... https://www.electronicdesign.com/technologies/test-measurement/article/21801317/why-you-should-care-about-oscilloscope-acquisition-modes if point to point averaging takes, say 8 points averaging to do 1 hi-res point (hires is someone hiring someone), at 8GSa/s, i read it as equivalent 1GSa/s of sampling rate, 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.

nctnico:

--- Quote from: Mechatrommer on October 30, 2022, 12:05:20 pm ---
--- Quote from: balnazzar on October 30, 2022, 11:19:52 am ---I'm not understanding why hires seems to do nothing at mitigating the scope's self noise...

--- End quote ---
its a bell and whistle after the signal path, like averaging... so take it as what it is... https://www.electronicdesign.com/technologies/test-measurement/article/21801317/why-you-should-care-about-oscilloscope-acquisition-modes if point to point averaging takes, say 8 points averaging to do 1 hi-res point (hires is someone hiring someone), at 8GSa/s, i read it as equivalent 1GSa/s of sampling rate, 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 ---
That is a good observation. Well spotted! Basically 4Gs/s or even 8Gs/s is complete, total and utter overkill for a 70MHz oscilloscope. Heck, it would be better to implement a decimation  algorithm that turns 16 samples into 1 sample. That would give 2 extra bits of ADC resolution. There is enough noise to make that work like a charm.

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