Products > Test Equipment
REVIEW - Rigol DS2072 - First Impressions of the DS2000 series from Rigol
AndyC_772:
--- Quote from: EV on April 30, 2013, 08:38:31 pm ---The Chump seems to have it and maybe AndyC_772.
--- End quote ---
I have a DS4054 at work, which I could probably have a play with if you like.
My own scope is an Agilent MSO-X3054A, and I couldn't resist comparing it... trigger event to trig out delay is 27.6ns, and the jitter on the trig out pulse is about 200ps peak-to-peak, though the scope isn't really able to measure such small amounts with any degree of accuracy.
marmad:
--- Quote from: AndyC_772 on May 01, 2013, 04:07:12 pm ---I have a DS4054 at work, which I could probably have a play with if you like.
My own scope is an Agilent MSO-X3054A, and I couldn't resist comparing it... trigger event to trig out delay is 27.6ns, and the jitter on the trig out pulse is about 200ps peak-to-peak, though the scope isn't really able to measure such small amounts with any degree of accuracy.
--- End quote ---
Thanks, Andy.
Two quick questions: is the delay you measured from triggering on a channel input or external trigger in?
Also, I've been reading a lot about the X- Series recently - trying to figure out Agilent's specifications for the memory usage (which ain't easy). From what I understand from their specs (assuming you don't have the 2MB Mem upgrade), if you're running all 4-channels simultaneously in Auto/Normal mode - you have 250kB per channel. Is that correct? Or does the halving of memory during Normal mode affect just a channel 'pair' (i.e. 500kB)?
Have you verified actual memory amounts when stopped (since Agilent is obviously fairly cagey in this regard; i.e. no tables anywhere in all of their literature)?
EV:
Here is trig out jitter when trigged to CH2 100 MHz sine wave. Jitter is about 2 ns. It was about 1.2 ns when trigged to CH1.
marmad:
--- Quote from: EV on May 01, 2013, 05:46:41 pm ---It was about 1.2 ns when trigged to CH1.
--- End quote ---
Isn't that when you had it triggering itself?
I see the same 8ns when triggered from Ch2 with 1MHz sine.
AndyC_772:
--- Quote from: Teneyes on May 01, 2013, 05:00:36 pm ---Thanks Andy if you could test the DS4000, off company time :)
The Agilent does it faster
Was there any difference in the delay between channel triggered and External triggered,
memory depths?
Auto and Normal triggering?
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Using the external trigger input, obviously I can't actually see the trigger event itself, but the mid-point of the rising edge on the trigger output is at t=32.3ns, with basically no visible jitter.
Switching between auto and normal triggering makes no difference, and nor does changing the memory depth. However, if there's no signal present, and so the scope free runs in auto mode, then there is trigger jitter - the trig pulse is anywhere from t=19.9ns to t=40.3ns, with a distribution clustered somewhere near the middle of that range.
Of course, in this case it's not triggering on anything in particular, so synchronisation to an external device isn't really an issue - but maybe it gives a clue as to what's making the decision to start a sweep in auto mode. I could convince myself that the spread is exactly 20ns, meaning the 'auto' deicision is made based on a count of a 50 MHz clock somewhere inside the scope.
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