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| Rigol MSO5000 HiRes mode |
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| Fungus:
It seems to gain about 1 more bit of ADC resolution. |
| gf:
--- Quote from: 2N3055 on October 30, 2022, 01:25:10 pm ---Just a note: bits stated in document are theoretical. 8 bit scopes don't have ENOB (effective number of bits) of 8 bits but less. But improvements (12 bit is 4 bits more than 8 bits, so 4 bits of improvement) should be reasonably followed. --- End quote --- Good point. It is of course important to distinguish enhancement of numerical precision, and ENOB enhancement. A 16-tap moving average enables 4 additional bits of numerical precision, but ENOB enhanecment is at most 2 bits. --- Quote from: skander36 on October 30, 2022, 03:12:35 pm --- --- Quote from: Fungus on October 30, 2022, 01:39:50 pm ---... Hires mode still should work with certain combinations of sample rate and memory size, right...? --- End quote --- On Rigol 5k High Res effect is a little better visible on MSO's LCD display than on pics saved from screen. If you zoom in you can see better but not as clear as on other scopes. --- End quote --- in order not to rely on visual assessment, I had asked for standard deviation measurements. But these numbers aren't plausible either, when normal mode shows a lower number than hires. :-// I wonder, whether they are possibly taken from the screen, too, or from the the "real" captured data? |
| balnazzar:
--- Quote from: nctnico on October 30, 2022, 12:12:01 pm --- --- 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. --- End quote --- Not so overkill with 350 MHz and 4 channels simultaneously active. But I get your point. |
| balnazzar:
Mh, the ED's article and Tek's doc are good stuff, especially for a beginner like me. Thanks... Would you tell me again where to find the difference about Lecroy ERES vs common High Resolution? |
| skander36:
--- Quote from: gf on October 30, 2022, 03:20:51 pm --- ... in order not to rely on visual assessment, I had asked for standard deviation measurements. I wonder, whether they are possibly taken from the screen, too, or from the the "real" captured data? --- End quote --- Some data from excel chart + csv along with stdev. |
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