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| Rigol DHO800 memory depth / bandwidth upgrades and noise level! |
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| ebastler:
--- Quote from: 2N3055 on November 06, 2023, 10:29:51 pm --- --- Quote from: ebastler on November 06, 2023, 10:16:10 pm ---@Fungus -- a quick check for offset contributions in the non-averaged noise measurements is still relevant, I think. Either re-calibrate and do the V.rms measurements again, or measure V.avg in addition to V.rms and calculate V.noise = srqt (V.rms² - V.avg²). I would actually prefer the latter approach, which works even if the auto-calibration leaves some residual offset. As it does in my DS1054Z -- which comes in at approx. 400µV noise with the same 1ms/div, 1mV/div settings, by the way, in case anyone is still looking for a reason to upgrade. ;) --- End quote --- AC RMS (Stdev) excludes DC offset by definition. There is separate RMS measurement that is AC+DC RMS --- End quote --- Ah, thanks -- I had totally overlooked the AC.RMS bit. :palm: Just spent several minutes wondering how V.avg could possibly be larger than V.rms... I guess this means it's bedtime for me! |
| 2N3055:
--- Quote from: Fungus on November 06, 2023, 10:28:12 pm --- --- Quote from: Martin72 on November 06, 2023, 10:26:50 pm ---These are pretty good values. --- End quote --- $399 Rigol FTW! --- End quote --- Actually 100-120µV of offset is not so good as it could be . You should run self cal. |
| Fungus:
--- Quote from: 2N3055 on November 06, 2023, 10:34:43 pm ---Actually 100-120µV of offset is not so good as it could be . You should run self cal. --- End quote --- I just did! What was the spec of the vertical offset amplifiers again? I'm happy with 100uV. :popcorn: |
| 2N3055:
--- Quote from: Fungus on November 06, 2023, 11:03:16 pm --- --- Quote from: 2N3055 on November 06, 2023, 10:34:43 pm ---Actually 100-120µV of offset is not so good as it could be . You should run self cal. --- End quote --- I just did! What was the spec of the vertical offset amplifiers again? I'm happy with 100uV. :popcorn: --- End quote --- It is not bad. Just trying to see where is the baseline... |
| ebastler:
--- Quote from: Fungus on November 06, 2023, 11:03:16 pm ---What was the spec of the vertical offset amplifiers again? I'm happy with 100uV. :popcorn: --- End quote --- I don't think Rigol specifies the allowable residual offset after self-cal. But it seems they know it's not perfect -- that's why the bias adjustment allows you to compensate for small offsets and drifts manually, right? (Section 5.10 of the manual.) |
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