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

--- Quote from: bdunham7 on November 12, 2023, 09:30:36 pm ---
--- Quote from: ebastler on November 12, 2023, 09:18:00 pm ---For the 1 V/div acquisitions, I get 9*1000 mV / 5 mV = 1800, so a bit less than 11 bits.

--- End quote ---

9?  But yeah, I'm seeing 10+ ENOB, pretty good actually.

--- End quote ---

I don't have the DHO800 myself, but was assuming that the full ADC range is not mapped to exactly 8 vertical divisions, but that there is approx. half a division of "margin" at the top and bottom.

Edit: Dave shows it here for the MSO4000.
bdunham7:
So here is the SDS1204X-E, the second one is expanded after capture to show that there's essentially 1LSB of flipping, so the noise probably can't get any better.  But I get an ENOB of a bit more than 8 bits--8.97 7.5 based only on noise?  IOW, this is as far as 8-bit tech can go here and the DHO800 clearly exceeds that at these scales.




Martin72:
Determining the ENOBs ( at 10Mhz) of a DHO4000 and R&SMX04:

https://electronicprojectsforfun.wordpress.com/to-enob-or-not-to-enob/

gf:

--- Quote from: ebastler on November 12, 2023, 09:18:00 pm ---For the 1 V/div acquisitions, I get 9*1000 mV / 5 mV = 1800, so a bit less than 11 bits.

--- End quote ---


--- Quote from: bdunham7 on November 12, 2023, 09:30:36 pm ---9?  But yeah, I'm seeing 10+ ENOB, pretty good actually.

--- End quote ---

But 9Vpp (provided that is the full scale range of the ADC) is only 3.182VRMS, for a full scale sine wave. Then the SNR is 20*log10(3.182/0.005) = 56.075 dBFS, or equivalently (56.075-1.76)/6.02 = 9.0224 ENOB.
bdunham7:

--- Quote from: gf on November 12, 2023, 09:39:38 pm ---But 9Vpp (provided that is the full scale range of the ADC) is only 3.182VRMS, for a full scale sine wave.

--- End quote ---

Doh!  I knew I had some error in there somewhere.
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