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

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Orange:

--- Quote from: Teneyes on May 20, 2014, 10:21:17 am ---
--- Quote from: Orange on May 20, 2014, 09:08:36 am ---I tested with Sin Wave 100mV RMS, and with Sq wave 1Vpp. I did not see any difference in the jitter.

--- End quote ---
was the Sq.wave above and below 0.0 Vdc ,
What version of FW??

--- End quote ---
Symetrically at 0Volts, so -500..+500mv
FW is 3.00.01.03

marmad:

--- Quote from: Teneyes on May 20, 2014, 07:22:24 am ---Note that there appears to be about a  9ns offset between the "EDGE" External Trigger point and the CH1 trace.

--- End quote ---

The offset I get with a 0V External Trigger level is ~5-6ns (see image #1 - it varies a bit based on input voltage level). But since the External Trigger is a different signal path from the channel inputs, I would expect some difference. Of course, the offset changes based on the trigger level set: note the 3 images with a 0, 500mv, and 750mV trigger level. At 500mv (with 2V pk-to-pk square wave input simultaneously to CH1 and EXT) there is zero offset.

It appears the optimal setting for an External Trigger (assuming you want as little offset as possible) is between ~1/4 to 2/3 (with 1/2 between the average) of the respective-going voltage (i.e. for falling/negative edges/pulses ~half of the negative voltage - for rising/positive edges/pulses ~half of the positive voltage).


--- Quote from: Orange on May 20, 2014, 08:17:50 am ---I can confirm the delay of 9nS, also I see jitter of 500nS if I trigger externally.

Symetrically at 0Volts, so -500..+500mv
FW is 3.00.01.03

--- End quote ---

+500mV/-500mV square wave - virtually zero jitter (and no offset with trigger level set to 250mV). Check animated GIF of captured segments.

Orange:

--- Quote from: marmad on May 20, 2014, 12:26:15 pm ---
--- Quote from: Teneyes on May 20, 2014, 07:22:24 am ---Note that there appears to be about a  9ns offset between the "EDGE" External Trigger point and the CH1 trace.

--- End quote ---

The offset I get with a 0V External Trigger level is ~5-6ns (see image #1 - it varies a bit based on input voltage level). But since the External Trigger is a different signal path from the channel inputs, I would expect some difference. Of course, the offset changes based on the trigger level set: note the 3 images with a 0, 500mv, and 750mV trigger level. At 500mv (with 2V pk-to-pk square wave input simultaneously to CH1 and EXT) there is zero offset.

It appears the optimal setting for an External Trigger (assuming you want as little offset as possible) is between ~1/4 to 2/3 (with 1/2 between the average) of the respective-going voltage (i.e. for falling/negative edges/pulses ~half of the negative voltage - for rising/positive edges/pulses ~half of the positive voltage).


--- Quote from: Orange on May 20, 2014, 08:17:50 am ---I can confirm the delay of 9nS, also I see jitter of 500nS if I trigger externally.

Symetrically at 0Volts, so -500..+500mv
FW is 3.00.01.03

--- End quote ---

+500mV/-500mV square wave - virtually zero jitter (and no offset with trigger level set to 250mV). Check animated GIF of captured segments.

--- End quote ---

Nice animated JPEG ! almost a real scope on your desktop :)
However I can see horizontal jitter, if you look closely, you can spot it. It is even better viewable with a fast risetime signal, and on 2nS/div....
We are talking about 500pSec. This dissapears if you change the trigger from ext to ch1 (at least on mine)

marmad:

--- Quote from: Orange on May 20, 2014, 01:45:54 pm ---Nice animated JPEG ! almost a real scope on your desktop :)
However I can see horizontal jitter, if you look closely, you can spot it. It is even better viewable with a fast risetime signal, and on 2nS/div....
We are talking about 500pSec. This dissapears if you change the trigger from ext to ch1 (at least on mine)

--- End quote ---

I just realized that you changed 500ns jitter to 500ps in a later post - a slight difference ;) - so, yes, there seems to be a jitter of ±500ps 250ps - i.e. one sample period.

EDIT: I think the jitter is ±250ps or 500ps in total - see attached GIF.

jlmoon:
Just a matter of curiosity:

Has anyone determined the better of the two latest firmwares for the DS2000 series yet?  FW v2.xxxx or v3.xxxxx?
I just bought a DS2202 non A version and have the desire to unlock all the options but want to make sure I have the better (less buggy) of the firmwares in place first.
I have the HW level 1 version so I presume I will be stuck with 1M inputs which is no big deal. 

Thx

JLM

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