Products > Test Equipment

Rigol DHO800 memory depth / bandwidth upgrades and noise level!

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Fungus:
The results are in. Here's the RMS noise level of both bandwidth options, with and without bandwidth limiter, nothing connected to the inputs.

There's surprisingly little difference, only about 5%. I repeated it three times just to be sure, I honestly expected more.



voltsandjolts:
I see two screenshots, both at 20MHz bandwidth, showing same noise as expected.
When you say 'nothing' on the inputs, do you mean floating inputs, or 50 Ohm terminated inputs?

ebastler:

--- Quote from: voltsandjolts on November 06, 2023, 07:01:20 pm ---I see two screenshots, both at 20MHz bandwidth, showing same noise as expected.

--- End quote ---

Look at channel 2.  ;)

Fungus:

--- Quote from: voltsandjolts on November 06, 2023, 07:01:20 pm ---I see two screenshots, both at 20MHz bandwidth, showing same noise as expected.
When you say 'nothing' on the inputs, do you mean floating inputs, or 50 Ohm terminated inputs?

--- End quote ---

There's two channels on each...

Floating inputs.

Serg65536:

--- Quote from: TomKatt on November 06, 2023, 04:55:53 pm ---Yes ADC - duh.  The DST time shift always puts me off.

And I didn't mean to infer the lack of dual ADC's made it unusable, only that sampling rate seems to be an otherwise high priority spec.

--- End quote ---
I've got you wrong, sorry.
Yes, BW to SR ratio is not good here.

But it's always nice to have the ability to capture a signal with the maximum available BW and full 1.25 GS/s.

IMHO, it's more disappointing to have very high noise due to 8 GS/s ADC, and use an oscilloscope below 100 MHz on daily basics.

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