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How much noise floor and other things matter in oscilloscope usability
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Fungus:

--- Quote from: nctnico on December 29, 2021, 12:35:40 pm ---In the end neither is suitable for looking at 350MHz signals using 4 channels. The Siglent SDS2k due to low samplerate, the Rigol MSO5000 due to excessive noise. Also note what David Hess wrote: Rigol typically performs math on decimated data which can give the wrong results when doing measurements on noise.

All in all, if you venture into the HF arena, you'll need to look at more expensive scopes.

--- End quote ---

Probing a 350MHz signal with passive probes is also a minefield, the artifacts from the probe will usually be bigger than the signal.

I wouldn't buy either of these for the bandwidth, I'd buy them for the big touch screens, large memory, etc.
Fungus:

--- Quote from: Fiorenzo on December 29, 2021, 12:48:20 pm ---Yes fungus I think so.
In regard of your suggestion to buy a cheaper scope my thinking was in line with you but i needed some function that are only in the Siglent sds2000.

--- End quote ---

What function?

Siglent has added more functions to the SDS1104X since launch. Maybe they added it but you're looking at an old manual.


--- Quote from: Fiorenzo on December 29, 2021, 12:48:20 pm ---In the end if you or other have suggestions i can do some other test with the limited equipment i have until I have both the scopes at home..... because i am going to send back the Rigol as soon as possible.

--- End quote ---

The only other interesting test is the effect of intensity on the color-graded display.

For that a photo of the screen isn't really good enough though. You'll need to put in a USB stick and press the 'print' button.
Martin72:
I´ve changed from MSO5354 ( ;)) to the sds2k+ - After I did the very first ripple-measurement with the mso.
The noiselevel is "horrible", useless for doing low noise measurements - By the way, Dave mentioned it also in his first rigol mso 5000 video.
I got the sds2k+ over a year now, before the rigol over a year, there is nearly nothing the rigol can do better.
Display is worser, much worser ( same resolution btw), UI is mickey mouse style and sometimes really confusing, the response itself is slower...
It´s a shame, because the hardware itself is powerful, except the noisy frontend.
And as I´ve asked the rigol support, if there is a chance to get it better by buying the 7000, their answer to me kills everything.
Frontend are the same and that was it, I´ve changed to siglent without any regrets so far, except the missing of 4 math-traces at the same time..

mawyatt:
We had to sift thru all this a year and half ago. After a few months decided to "listen" to those that had actual experience with the scopes and for comparisons actually had used various brands. Dave's videos are a great resource, and should be reviewed many times.

Couple folks here (think 2N3055 & Martin72) have actually used and worked with both the Rigol and Siglent scopes, so value these experiences and responses.

BTW we decided on the Siglent SDS2000X+, the deciding factor was the Rigol noise. Now have 2 Siglent scopes and maybe getting a 3rd, so that alone says enough about our experiences.

Best, and Happy Scope Hunting :-+
mawyatt:
Not to discredit Rigols' attempt and deployment of integrating the entire front end and ADC, actually we should applaud them :clap:

Coming from a career that often involved low noise, wide bandwidth and high dynamic range requirements, designing such at the discrete level is extremely difficult, and speaking from experience, at the Integrated IC level, this becomes exceedingly difficult and quite expensive. Things that work at the discrete level may not work so well on an IC, and an entire different design approach is often required. Modern IC processes that feature amazing small devices, and very fast, are dictated by the digital requirements. The analog use of such is "you get what you get" and you must figure out how to achieve the analog performance goals, which often means a complete departure from a conventional discrete approach.

Anyway, hopefully Rigol (Siglent, maybe some other mid-level players) will continue with an integrated scope front-end and ADC solution because we'll all benefit from this integration.

Best,
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