Products > Test Equipment
Rigol DHO800 memory depth / bandwidth upgrades and noise level!
ebastler:
@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. ;)
Fungus:
One more before bed time...
I did a self-cal and measured Vavg as well as AC-RMS. There's only 3 channels because that's all that fits in the visible area (you guys can't scroll tables up/down like I can):
Martin72:
These are pretty good values.
One more thing about ac "mode" and dc-offset:
When switching to ac coupling, a cap will be switched between signal input and the following stages in the frontend.
This will have nearly no effect to the offset.
AC coupling will block the dc offset of the signal.
Fungus:
--- Quote from: Martin72 on November 06, 2023, 10:26:50 pm ---These are pretty good values.
--- End quote ---
$399 Rigol FTW!
2N3055:
--- 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
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