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

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lemon:

--- Quote from: Galaxyrise on July 16, 2013, 06:18:55 am ---
--- Quote from: marmad on July 12, 2013, 03:51:29 pm ---This seems oddly reminiscent of trying to convince you that Rigol's High-Res mode produces the same results as everyone else.

--- End quote ---
I'm probably just inviting more abuse onto myself, but the Rigol High-Res mode is so different from what I expected that I am curious to see comparisons.

How do other scopes (especially the Agilent) handle a 40mVpp 100kHz sine wave at 1ms/div 10mV/div?  Both max memory depth and 1MSa/s.

Here's the Rigol images for comparison:

--- End quote ---


(Original post:
https://www.eevblog.com/forum/testgear/first-impressions-and-review-of-the-rigol-ds2072-ds2000-series-dso/msg262688/#msg262688)

From what I can see, there is fw bug there. The 40mV of wave doesn't cover four divisions neither at high or low resolution.

Some captures from Owon SDS7102. No aliasing at all, right trigger appearing.


Galaxyrise:

--- Quote from: lemon on August 22, 2013, 03:57:55 pm ---From what I can see, there is fw bug there. The 40mV of wave doesn't cover four divisions neither at high or low resolution.

--- End quote ---
Those were both high res.  The difference was the sample rate. When I used "Normal" instead of "High Res" Acquisiton, the waveform was fine.  There's some kind of aliasing going on, taking the 40mV, 100kHz signal and displaying it (at 1GSa/s) as 2mV, 2.33kHz, or (at 1MSa/s) as 10mV, 12kHz.  Stopping the scope and zooming in, the 100kHz, 40mV waveform will be there: I'm pretty sure the Ultravision "High Res" happens when converting the acquired samples to display and does not affect acquisition at all.

Thanks for providing another comparison! In your Owon example, is that with high res acquisition? What happens when you drop the sample rate down to 1MSa/s?

lemon:
I see now but I am not familiar with the menu and philosophy of Rigol.

The Owon has a different firmware philosophy. It doesn't follow the logical of Normal and High Resolution (at least not in this way).
There is the Acquisition Mode (Normal, Peak and Average) and the Memory Length (1k, 10k, 100k, 1M, 10M). You set the Acquis. Mode and Length of Memory and the Sampling is automatic according to Time base. If you see at the first capture with 1ms, it automaticaly sets 500MS/sec but at the second that is in stop mode (not running) with 5us Time base the Sampling sets to 1GS/sec.

I hope to don't confuse you, now...

Teneyes:
Self Calibration

How well does the 'Self-Cal' work for your DS2000?

For No input , after a 'Self-Cal' ,
I seem to consistently get:
     Channel 1    -125uV
     Channel 2       25uV

Looks like Chan. 2 is better

Note:   20MHz BW , 1msdiv  128 Averaging

bronson:
By "no input" do you mean grounded or floating?

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