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

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marmad:

--- Quote from: Svuppe on November 20, 2013, 09:04:31 am ---I tested that last night on my 2000X, which has the optional 1M memory option.

--- End quote ---

@Svuppe: Fantastic! Thanks so much for doing that!


--- Quote from: Svuppe on November 20, 2013, 09:04:31 am ---I used the built-in waveform generator, which only goes to 20 MHz, so I couldn't get the last few measurements.

--- End quote ---

Don't worry, my table was quickly done - and isn't super-accurate since I don't have an FG that generates a very precise sweep.

But this shows that the filtering caused by successive sample averaging is comparable on both DSOs - and NOT caused by the way that Rigol performs it (as continually asserted by evanh). The tables are quite similar, with the Agilent's being shifted down by 3 time bases - which corresponds to the fact that it starts full 12-bit averaging at a slower time base than the Rigol.

evanh:

--- Quote from: marmad on November 19, 2013, 02:18:24 pm ---
--- Quote from: evanh on November 19, 2013, 01:38:24 pm ---High-res acquisition mode operates in oversampling only
--- End quote ---

No, it CAN use oversampling - but it's not a prerequisite. Just look at the specs for the Agilent 2000 X-Series High Res mode at the following time base settings:
--- End quote ---

It is a prerequisite for high-res acquisition.


--- Quote ---...
Successive sample averaging ("High Res") is purely a math operation on either incoming or stored samples - oversampling can be used, but it's not a necessity.
--- End quote ---

* evanh goes googles for user manual ... Agilent has nice website  :) ...  Okay quoting the 2000 X manual:
"High Resolution — at slower time/div settings, all samples in the effective sample period are averaged and the average value is stored."

That's pretty clear cut.  It only filters the oversampled data.  There is zero filtering of the stored trace.


--- Quote ---
--- Quote ---Rigol doesn't do this, so, although it is high-res, it's not an acquisition mode.
--- End quote ---

Oh, so now you're admitting that the Rigol IS doing successive sample averaging? Just that it's not an "acquisition mode"?   ;D
--- End quote ---

I've never said otherwise.  The only comment I've made is that the maths is not the issue.  The real issue is the lack of oversampling and the filtering cutting into the displayed trace.

Carrington:
@Teneyes
@Marmad
@Svuppe

Thank you very much for all the info.
Cool people make a cool forum.  :-+ :-+ :-+ :-

Teneyes:

--- Quote from: Svuppe on November 20, 2013, 09:04:31 am ---I can't get the table to align nicely. I hope it is readable anyway.

Time base   Bandwidth (-3db)  -   First null in stopband

 10ms/div     ~34kHz     ~77kHz
  5ms/div    67.8kHz   153.6kHz
  2ms/div   169.6kHz   384.0kHz
  1ms/div   339.0kHz   768.0kHz
500us/div   676.7kHz   1.536MHz
200us/div   1.689MHz   3.840MHz
100us/div   3.364MHz   7.680MHz
 50us/div   6.704MHz   15.36MHz
 20us/div   16.87MHz       ?
 10us/div       ?          ?
  5us/div       ?          ?


--- End quote ---

@ Svuppe use Courier Font for Fixed Spacing

Carrington:
@Svuppe
Just curious:
You know if the DSOX2000 series gives their maximum waveforms per seconds with auto memory only, or with maximum memory too?
Thanks.  ;)

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