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First picture on EEVblog of the new R&S MXO4 series oscilloscope :)

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2N3055:

--- Quote from: egonotto on February 09, 2023, 04:11:03 pm ---Hallo,

@Rich@RohdeScopesUSA:

However, RMS is not the right measure here. Better is peak to peak or the really visible width of the noise band.


But I would be interested to know why LeCroy HDO 1 GHz at 1 V/div is so much better. Especially compared to RTA4004, even if this is 1.25 V/div in comparison to 1 V/div.


Best regards

--- End quote ---

Every scope frontend is combination of attenuators and amplifiers...
It all ends up how you combine them in the end...
How you combine them is also influenced with needed offset ranges...

Making a scope is the ultimate art of compromise..

Rich@RohdeScopesUSA:

--- Quote from: egonotto on February 09, 2023, 04:11:03 pm ---Hallo,

@Rich@RohdeScopesUSA:

However, RMS is not the right measure here. Better is peak to peak or the really visible width of the noise band.


But I would be interested to know why LeCroy HDO 1 GHz at 1 V/div is so much better. Especially compared to RTA4004, even if this is 1.25 V/div in comparison to 1 V/div.


Best regards

--- End quote ---
I hear you - but no one specs Vpp because it can be impacted by so many other things (e.g. update rate - you'll catch the outliers more often with a faster update rate).  With that said, see @2N3055's comment above. It's really true.

-Rich

Rich@RohdeScopesUSA:

--- Quote from: bozidarms on February 09, 2023, 04:07:58 pm ---
--- Quote ---If you think of it as a percent of scale, versus just an absolute number (I believe LeCroy uses eight vertical divisions versus ten for us), you can see noise is much more impactful at the smaller volt/div settings.
--- End quote ---

Thank you for your efforts.
Well, whether it's 1% or 0.1% full scale in the end doesn't matter.
If a signal is smaller than own oscilloscope noise, is and stay it  invisible.

--- End quote ---
No worries - I'm happy to help and I really appreciate your comments too.  And what you said is the challenge - pulling a small signal out of the noise.  Since that is more likely to be really hard at small volt/div settings with tiny signals, that is why we focused there. 

-Rich

bozidarms:
In fact, Lecroy noise - numbers are even better than proclamated.


--- Quote ---For MXO4 is stated - RMS noise floor ( HD mode ??? active for bandwidth ≤ 500 MHz)
--- End quote ---

How is actually, big noise by MXO4 in normal - 12 bit mode?

tautech:

--- Quote from: Bud on February 09, 2023, 02:18:34 pm ---"Preset" button can be confusing if all it does is loading default settings. It should be called "Reset" instead. Presets (at least to my view) should be customer configurable.

--- End quote ---
Many new instruments are.
It's a very convenient feature to return your scope to your preferred setup with a single button press rather than need to recall a previously saved Setup however they can be very useful for more specific tasks in that you can save several.

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