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

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marmad:

--- Quote from: Teneyes on April 28, 2013, 03:28:35 pm --- What is the delay from External Trigger in  to Trigger Out?

--- End quote ---

A little less: ~160ns.

marmad:

--- Quote from: Teneyes on April 28, 2013, 03:41:36 pm ---So  External trigger has different processing (more direct route, faster software routine) to display and output (trigger)
Does that say the ASIC takes 60nsec to process?
Is it different at Higher Scan rates; less samples? 
External trigger is most likely an Interrupt into the Main processor.

Would Triggering on Ext. change the update rate?

--- End quote ---

The digital trigger on CH 1 or 2 has to be derived from the samples from the ADC, so it makes sense that it takes a little longer than the External Trigger In.



The delay time does not vary based on memory depth or timebase settings - and the source of the triggering doesn't affect the update rates. But it turns out that you can make the Rigol count it's own wfrm/s fairly accurately by just feeding the Trigger Out into a single channel (the other channel is turned off), turning on the frequency counter for that channel, and then sending a 1MHz square wave to the External Trigger In. The displayed frequencies at each timebase are very close to the numbers I recorded using my Fluke counter. The image shows the 20ns timebase being counted - note the frequency:

marmad:

--- Quote from: Teneyes on April 28, 2013, 08:22:20 pm ---I suppose One could offset the Trigger position to the left of the Screen , and still see the Trigger output step (ie. 14 x 20ns=280 nS)

--- End quote ---

Yes. And looking at the Trigger Out edge at the smallest timebase setting shows that the delay varies from 159ns to 167ns (exactly 8ns deviation).

 

Hydrawerk:

--- Quote from: marmad on April 28, 2013, 02:37:45 pm ---Measuring the Trigger Output delay of the Rigol. Here it is fed back into channel 2, and it appears the delay is ~220ns:



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Is 220ns a good result?

marmad:

--- Quote from: Teneyes on April 29, 2013, 01:40:51 pm ---Did the traces always have the  250ps  spacing?  some sort of Discrete timing resolution
250ps corresponds to 4 Ghz , is that the CPU clock rate ? (different memory access delays)
Does that spacing change with different trigger input frequencies, I suspect NOT
With DPO intensities do some traces occur more often?

--- End quote ---

Always exactly 32 traces at, as you mentioned, precisely 250ps spacing (8ns total). It looks like when I vary the persistence every 4th trace (1ns / 1GHz) is less frequent.

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