Products > Test Equipment
REVIEW - Rigol DS2072 - First Impressions of the DS2000 series from Rigol
Carrington:
@Teneyes: This reminds me to the persistence effect. Although probably not have anything to do.
* 100MHz_Vec_2ch_trig0.png and 100MHz_dots_2ch_trig0.png overlay:
Note: Very nice the point clouds. :)
marmad:
--- Quote from: Wim13 on December 24, 2013, 08:13:15 pm ---Also got more noise, see picture with only 1 channel, and then enable channel 2,
the difference is clear, on 1 nS the sample rate is to low for two channels.
The performance is worse on 1 nS then on 2 nS.
--- End quote ---
@Wim: I think the problem in the images you posted has to do with the intensity-grading - not with noise or sample rate. Rigol seems to have fixed the intensity-grading issues in Delayed Sweep mode, but not those when two channels are turned on in Normal Sweep at time bases <= 50ns/div (I reported both problems to them via Drieg back in early June).
Look at this sequence of images made at 1ns/div: all of them have intensity set to 50% - except the last one, which is intensity at 0%. You can see that with two channels on in Delayed Sweep, the intensity is a pretty good match to the images with just one channel on. But in Normal Sweep, the intensity has to be set to 0% to get a closer match.
EDIT: I've added the following back into the bug list at the beginning:
2) The way the scope handles intensity grading at time bases <= 50ns/div when two channels are enabled with Normal Sweep is not the same as all other modes - it feels incongruous and incorrect.
[FW v.01.01.00.02 / FW v.02.01.00.03]
Teneyes:
Intensity grade seems ok at slow scan rates, but not so good as scan rate increases
for both channels. Faster than 200nsec/div is limit
Does it seem that the min. persistence should vary for each condition and it does NOT?
1Ch alone seems OK
EV:
Here are pictures abot this 2 channel trace problem. There are first 3 pairs of pictures with 1, 2 and 5 ns time base. Pictures with vectors and dots are from same sweep in normal single mode. 2 last pictures are from auto sweep.
EV:
It looks that this sin(x)/(x) algoritm is not working very well if both channels are on.
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