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REVIEW - Rigol DS2072 - First Impressions of the DS2000 series from Rigol

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Galaxyrise:

--- Quote from: marmad on July 09, 2013, 10:24:10 pm ---Huh?  ???  Totally aliasing - not close at all.

--- End quote ---
I think you missed what Teneyes was replying to ;)

Hydrawerk:

--- Quote from: Teneyes on July 09, 2013, 10:15:25 pm ---
--- Quote from: Hydrawerk on July 09, 2013, 10:05:11 pm ---So how do similar pictures from DS2000 look like?

--- End quote ---
I think pix are close to Hydrawerk's conditions

--- End quote ---
Thank you for the pictures. What happens if you turn on the Antialiasing feature?

zibadun:

--- Quote from: Hydrawerk on July 09, 2013, 10:36:50 pm ---
--- Quote from: Teneyes on July 09, 2013, 10:15:25 pm ---
--- Quote from: Hydrawerk on July 09, 2013, 10:05:11 pm ---So how do similar pictures from DS2000 look like?

--- End quote ---
I think pix are close to Hydrawerk's conditions

--- End quote ---
Thank you for the pictures. What happens if you turn on the Antialiasing feature?

--- End quote ---


hydrawerk, here is the antialiasing feature at work on Rigol https://www.eevblog.com/forum/testgear/first-impressions-and-review-of-the-rigol-ds2072-ds2000-series-dso/msg255344/#msg255344.   It attempts to minimize moire patterns on the display.  I think it works fine

marmad and now Teneyes expect this feature to do something else in undersampling mode. But looks like they will get  either noise with some aliasing (Agilent) or "classic" aliasing (Rigol).  they don't get to see the real signal while undersampling.  So guys pick your poison  :-//

Marc M.:

--- Quote from: zibadun on July 10, 2013, 03:54:25 am ---marmad and now Teneyes expect this feature to do something else in undersampling mode. But looks like they will get  either noise with some aliasing (Agilent) or "classic" aliasing (Rigol).  they don't get to see the real signal while undersampling.  So guys pick your poison  :-//

--- End quote ---
Please add me to the above list ;).  Both Marmad and Teneyes understand the theory behind proper anti-aliasing as applied to scopes and it is clear that Rigol does not perform it that way.  With all the material that's been presented on how random decimation of the raw data helps to minimize the effects of aliasing, I'm at a bit of a loss why this is still being argued  :-//.

marmad:

--- Quote from: zibadun on July 10, 2013, 03:54:25 am ---hydrawerk, here is the antialiasing feature at work on Rigol https://www.eevblog.com/forum/testgear/first-impressions-and-review-of-the-rigol-ds2072-ds2000-series-dso/msg255344/#msg255344.   It attempts to minimize moire patterns on the display.  I think it works fine
--- End quote ---
Wow, you just don't want to stop being wrong about this  :)

The meaning of Aliasing, as applied to a DSO, is when high-frequency components “fold down” into a lower frequency when the sample rate isn’t fast enough. What you call "classic" aliasing is the ONLY aliasing - there is NO other meaning in the world of Digital Storage Oscilloscopes. As I've mentioned before, if you think there is, please post a link describing a different kind of aliasing in DSOs.

What Rigol calls Anti-Aliasing is a useless feature. There is no way I would be confused by your first image into thinking I was seeing a lower frequency than I was. Oh great, it's managed to eliminate a fluctuating pattern in a solid block of pixels - whoopee!  ;D


--- Quote ---marmad and now Teneyes expect this feature to do something else in undersampling mode. But looks like they will get  either noise with some aliasing (Agilent) or "classic" aliasing (Rigol).  they don't get to see the real signal while undersampling.  So guys pick your poison  :-//
--- End quote ---
The Agilent's "noise", as you call it, is actually a solid block of pixels, which is what you should see given the frequency and sample rate - that is the REAL signal (or a close enough approximation). That would actually help me from being confused by incorrectly folded-down lower frequencies. Sorry, but it seems as if you still don't understand the concept of what it's doing ;)

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