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

--- Quote from: Fungus on November 06, 2023, 09:21:58 pm ---This is all channels at 100MHz bandwidth. CH1 and CH2 have tinfoil, CH3 and CH4 don't.
The winner is: CH3 - no tinfoil!  :popcorn:
I put a 50 Ohm terminator on CH3 and it went down to 38.8uV average.

--- End quote ---

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.
Fungus:

--- 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!

Martin72:
@ebastler:
All except channel 3, maybe he had forgotten to make a self-cal after his playaround with the bandwith down/upgrades.
Btw, the title of the topic is somewhat irritating...

Edit:


--- Quote ---and it went down into the nV range.
--- End quote ---

No wonder, given the number of passes selected.
But then you also have to question the plausibility of the result.
Fungus:

--- Quote from: Martin72 on November 06, 2023, 09:50:31 pm ---Btw, the title of the topic is somewhat irritating...

--- End quote ---

Yeah, I thought that, too. Does it change if somebody changes it?

Edit: Apparently not. Maybe is has to be OP...
2N3055:

--- Quote from: Fungus on November 06, 2023, 09:21:58 pm ---This is all channels at 100MHz bandwidth. CH1 and CH2 have tinfoil, CH3 and CH4 don't.

The winner is: CH3 - no tinfoil!  :popcorn:



I put a 50 Ohm terminator on CH3 and it went down to 38.8uV average.

--- End quote ---

These are nicely made  measurements. Now AC RMS is stable and measurements look valid.
Now people can compare to other scopes with same settings..

FUN FACT: RMS measurements (AC+DC and DC only RMS) will work absolutely perfectly even with scope undersampling. They work by integrating (averaging) and if you just take enough samples it will converge to right result. It is valid technique used in many instruments.


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