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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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