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Rigol DHO804 Test and Compare Thread

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Fungus:

--- Quote from: tautech on November 29, 2023, 10:34:43 pm ---
--- Quote from: Fungus on November 16, 2023, 01:28:02 am ---I'm still waiting for an explanation of the Siglent's FFT problems shown in Dave's review of the DHO800...

--- End quote ---
It has been revealed Dave can't drive FFT properly.
https://www.eevblog.com/forum/testgear/siglent-sds1104x-e-in-depth-review/msg5195079/#msg5195079

--- End quote ---

Why are you telling me? Take it up with Dave.

All I know is that Dave got it working on the Rigol, he got it working on the R&S, if he failed on the Siglent then there's a problem with the Siglent. Either in the UI or the implementation.

Randy222:

--- Quote from: Martin72 on November 29, 2023, 09:48:03 pm ---Hi Randy,

Measured -3dB point lies on 200Mhz.


--- Quote ---Also, if ch1 triggers from ch4, can you still get full 1.25Gsa/s on ch1 ?
--- End quote ---

Just tested it - samplerate will be then reduced to half although only one channel is active..

--- End quote ---
Arrrrg.

I assume then if the device does 1/2 on sample rate you will get 2x the record length when capturing for any given memory depth?

Does the 2ch w/ ext have the same issue when using ext as the trigger?

Martin72:

--- Quote ---Why are you telling me? Take it up with Dave.
--- End quote ---

Dave wasn't the one crowing all over the place that the siglent had a problem with the FFT...
This has now been readjusted three times with three different 1104X-Es, without any problems.
Speaking of problems, I had another hitch with the rigol after a long time, this time a "half".
Happened when I had the FFT function active to recreate the gimmicks, with FM mod and so on.
Suddenly the FFT display disappeared and didn't come back.
The signal itself was strangely discolored and you couldn't resolve it any further, the time base setting was out of order.
Very strange.

gf:
12.5 MSa/s implies a 0...6.25MHz maximum span, therefore the 10MHz center is out of range.

Martin72:
Yes, that's right - But that was displayed when the crash occurred, before that it was much more, or rather, I had taken the picture at that point by chance - It was 12.5MSa/s everywhere when the scope "froze".

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