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Rigol DHO800 memory depth / bandwidth upgrades and noise level!
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Fungus:

--- Quote from: ebastler on November 06, 2023, 09:46:13 pm ---Could you also measure the residual offset voltage (V_avg) on each channel? It will enter the V_rms calculation and might have a non-negligible effect. Some of the traces do not look perfectly centered to their respective 0V arrows.

--- End quote ---

Oh, yeah, I haven't done self-cal for a while. I have no idea what the bandwidth configuration was last time I did it.  :-DD

AC RMS shouldn't be affected by offset though.
2N3055:

--- Quote from: Fungus on November 06, 2023, 09:49:06 pm ---
--- Quote from: Martin72 on November 06, 2023, 09:25:27 pm ---Try average for acquisition...

--- End quote ---

I set 32768 averages and it went down into the nV range. Rigol FTW!

--- End quote ---
Well it is logical...

Noise is going to average to zero AC. What is left is DC offset..
2N3055:

--- Quote from: Fungus on November 06, 2023, 09:56:17 pm ---
--- Quote from: ebastler on November 06, 2023, 09:46:13 pm ---Could you also measure the residual offset voltage (V_avg) on each channel? It will enter the V_rms calculation and might have a non-negligible effect. Some of the traces do not look perfectly centered to their respective 0V arrows.

--- End quote ---

Oh, yeah, I haven't done self-cal for a while.

AC RMS shouldn't be affected by offset though.

--- End quote ---
Auto cal should compensate zero offset but also vertical gain..
But these differences in channels are within normal spread. We are talking microvolts here...
Fungus:

--- Quote from: 2N3055 on November 06, 2023, 09:58:20 pm ---Noise is going to average to zero AC. What is left is DC offset..

--- End quote ---

In AC RMS mode?
Martin72:
Watch the diagram in the vertical menu and think about again...
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