Products > Test Equipment
Rigol DHO800 memory depth / bandwidth upgrades and noise level!
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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