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Rigol DHO804 Test and Compare Thread

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Martin72:
I tested it with 20kbit data rate.
20KSa/s is too low, nothing is decoded.
It has to be 50Ksa/s to display anything meaningful.
However, you can't always play with the manual memory, everything under 1Mpt is dropped from 200ms/s.
Since the batronix board offers different data rates, I will probably test another, higher speed.

Fungus:

--- Quote from: Martin72 on November 20, 2023, 07:05:40 pm ---I tested it with 20kbit data rate.
20KSa/s is too low, nothing is decoded.

--- End quote ---

Well, obviously...

20kbit data rate means the clock signal is changing 40k times per second.

How will you capture that with 20kSa/s?


--- Quote from: Martin72 on November 20, 2023, 07:05:40 pm ---It has to be 50Ksa/s to display anything meaningful.

--- End quote ---

Working at 50kSa/s is quite impressive. It's only 20% above the minimum requirement.

(and the "minimum" still means you have to get lucky with the sample alignment)

ebastler:

--- Quote from: Fungus on November 20, 2023, 07:09:10 pm ---
--- Quote from: Martin72 on November 20, 2023, 07:05:40 pm ---It has to be 50Ksa/s to display anything meaningful.

--- End quote ---

Working at 50kSa/s is quite impressive. It's only 20% above the minimum requirement.
(and the "minimum" still means you have to get lucky with the sample alignment)

--- End quote ---

Agreed, that's a pretty convincing implementation.  :-+
Thank you for testing, Martin!

Martin72:

--- Quote ---How will you capture that with 20kSa/s?
--- End quote ---

It was only for demonstration... ;)
See the previous question from ebastler.

Martin72:
Now the data rate has been increased from 20kbits to 200kbits.
It needs 500KSa/s to decode this properly, very good.
I noticed this briefly when I was playing around earlier(with the lower datarate), but didn't go into it.
Now I noticed it again:
2.5MSa/s flawless decoding
1.25MSa/s NO decoding
500KSa/s flawless decoding again.
Interesting....

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