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

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EV:
Here is the rise time (848 ps) of DS2202 trig out signal measured with TDS3032 scope and P6243 Fet probe.

TP:

--- Quote from: Teneyes on May 18, 2013, 07:55:18 pm ---@TP
I went back and re- read your post on Hi Res and other problems
https://www.eevblog.com/forum/testgear/first-impressions-and-review-of-the-rigol-ds2072-ds2000-series-dso/msg172191/#msg172191

And I wonder if you agree that the DS2072 has more Bandwidth than 70MHz


--- Quote from: TP on December 16, 2012, 10:32:09 pm ---Inputting a pulse that should have a rise time of 5 ns (according to the specs for the chip I used) gives a rise time of 7.1 ns on the scope.  That means the scope rise time is 5 ns which matches the 70 MHz spec.

--- End quote ---

Have you tried feeding back the "Trigger out" fast pulse to test?

--- End quote ---

My BW "measurement" was only a wild guess, as I don't really know the rise time of my homemade pulse generator source (which is only a 74123 driving a 75451 driving 50 ohm).  When I feed Trigger Out into the input I get 3.8 ns rise time (into a 50 ohm 10X terminator via about 31" of RG58U).  Since I don't know the rise time of Trigger Out, I can't calculate the rise time of the scope.  However, worst case is Trigger Out is 0 nsec rise time meaning the scope BW would be 92 MHz minimum.  If Trigger Out rise time is 0.8 ns then the BW of my scope is 95 MHz minimum.

So what exactly is the point of the DS2102?

marmad:

--- Quote from: TP on May 19, 2013, 05:48:01 pm ---So what exactly is the point of the DS2102?

--- End quote ---

Do you really need to ask?  ;)  Also, I don't know if anyone has ever tested the real bandwidth of the Agilent DSO-X 2002A - perhaps it's the same as the DSO-X 2012A as well.

Hydrawerk:
 :( :( Well, I don't have a 0 to 200MHz generator to test the bandwidth of my DSOX2002A... Or is there a more simple way??

TP:

--- Quote from: egonotto on May 19, 2013, 12:36:47 am ---Hi,

@TP: Thanks for the hint. But you can not go below 500uV. I think here is yet a improvement  in the firmware possible. I will try this with the sample data on PC.
--- End quote ---

Unfortunately when I checked the data saved on a USB stick (CSV format) it was 8 bit quantized even when it had been taken in HiRes mode.  I don't know about data transfered directly to the PC via USB or Ethernet (say using Marmad's program).

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