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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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