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

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zibadun:

--- Quote from: marmad on July 07, 2013, 11:17:45 am ---
--- Quote from: zibadun on July 07, 2013, 04:19:06 am ---If it's so simple why don't you implement it in RUU marmad?

--- End quote ---

There's no way I could get sample data fast enough from the DSO to do it in real time. I could do it slowly - but what good would that be?

Anti-alias is ideally something you want to have while probing unknown signals at slower horizontal speeds - but once you figure out what you're looking at and adjust your settings accordingly - it becomes a bit irrelevant. But it's something that needs to take place between the sampling and the display of the data - and so even thought the basic implementation (in terms of math) is not complex - it DOES have it be done quickly.

--- End quote ---

If RUU is fast enough to render 3d it should be fast enough to draw "anti-alias". You can do it on a stored waveform, as a proof of concept.   A picture worth a thousand words in this case ;)

darrylp:

--- Quote from: marmad on July 06, 2013, 05:27:11 pm ---
--- Quote from: darrylp on July 06, 2013, 12:57:11 pm ---Have noticed from videos of people ds2xx2 that all earlier shipments come with switchable x1 x10 probes. Some people mention 350MHz bandwidth. Well my scope came with x10 non selectable , rigol info sheet says 300MHz bandwidth. Now I've got other probes for accessing the 500uV setting, but who else has the x10 only probes ?

--- End quote ---

The RP3300 x1/x10 switchable probes have been the standard included probes for the DS2000 series since they first started selling them. Where did you buy your DSO?

This is from the DS2000 User Manual:



--- End quote ---

I'm away from my scope at the moment, but the sheet tucked into each probe matched the actual probe. Ie no mention of a x1 position or switch. I'm 99% sure they are listed as RP3300.
Will post the pic tonight / tomorrow. Its a new scope bought from rigol-uk. Otherwise known as telonic instruments.

--
 Darryl

jc101:

--- Quote from: darrylp on July 07, 2013, 01:15:54 pm ---
I'm away from my scope at the moment, but the sheet tucked into each probe matched the actual probe. Ie no mention of a x1 position or switch. I'm 99% sure they are listed as RP3300.
Will post the pic tonight / tomorrow. Its a new scope bought from rigol-uk. Otherwise known as telonic instruments.

--
 Darryl

--- End quote ---

My DS2072 also came from Telonic, and did come with the RP3300 probes which are 1/10 switchable.  Although, on one of the two supplied the switch would not budge at all, it was stuck on x1.  After an e-mail to telonic they simply swapped it.  I got mine early April after an extended delay from order to delivery of 3 working days  :)

Xyphro:

The Firmware version is 00.01.01.00.02.

I made some tests.

I'm very confident, that the 500uV mode is a scaled mode and the gain in the analog path is the same as for the 1mV/DIV setting.

What I did:
I injected a 10 MHz signal from a signal generator with -50dBm (@50Ohm Termination) , set the scope to 200ns/DIV, max. sampledepth.

Then I made 2 measurements:
1.) 500uV/DIV => Single shot => saved CSV Data as 'Newfile1__500uv.csv'
2.) 100uV/DIV => Single shot => saved CSV Data as 'Newfile1__1000uv.csv'

Then I used this sample Matlab script to calculate a Histogram and check how many discrete values were actually used:


--- Code: ---sig500uv  = dlmread('Newfile1__500uv.csv', ',', 2, 0);
sig1000uv = dlmread('Newfile1__1000uv.csv', ',', 2, 0);

sig500uv  = sig500uv(:,2);
sig1000uv = sig1000uv(:,2);

hist500uv = hist(sig500uv, 10000);
hist1000uv = hist(sig1000uv, 10000);

c500uv = find(hist500uv > 0);
c1000uv = find(hist1000uv > 0);

c500uv = length(c500uv)
c1000uv = length(c1000uv)

--- End code ---

c500uv was in my case 72 and
c1000uv was 73

With a real *2 Gain in the analog path you c500uV would be twice as high as c1000uV.

marmad:

--- Quote from: zibadun on July 07, 2013, 12:52:03 pm ---If RUU is fast enough to render 3d it should be fast enough to draw "anti-alias". You can do it on a stored waveform, as a proof of concept.   A picture worth a thousand words in this case ;)

--- End quote ---

The math data on how to do it is readily available online - and used (at the very least) in the Agilent X-Series. Exactly what am I trying to prove and to whom?  ???

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