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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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