Products > Test Equipment

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

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Ivan7enych:

--- Quote from: Teneyes on May 20, 2014, 06:17:19 pm ---
--- Quote from: jlmoon on May 20, 2014, 05:57:01 pm ---Even a higher level of perfection would be a DS2304 with room to grow!.. :)

--- End quote ---
A few members here have 2 Rigols and connect trig out/in.
Maybe it's called the 'Combo DS1/2306'

--- End quote ---
I don't think it's a good idea.
As I wrote here, Trig Out signal from DS2072 has very bad jitter.
https://www.eevblog.com/forum/profile/?u=88871

marmad:

--- Quote from: Ivan7enych on May 21, 2014, 05:54:37 am ---I don't think it's a good idea.
As I wrote here, Trig Out signal from DS2072 has very bad jitter.

--- End quote ---
We had an in-depth discussion about the Trigger Out delay and jitter in this very thread over a year ago. But these things can be compensated for when using the Trigger Out.

BTW, in response to something you wrote 2 months ago:


--- Quote from: Ivan7enych on March 07, 2014, 08:10:51 am ---It seems, that Trig Out of 2072a is not hardware, but a kind of software (from FPGA logic) and it is suitable for low frequencies only, not higher than 1MHz I think.

--- End quote ---
The Trigger Out reflects the actual waveform capture rate of the DSO; it doesn't pass through triggers it doesn't use. As such, it's frequency will NEVER be higher than ~52kHz maximum. 



--- Quote from: Wim13 on May 20, 2014, 07:46:59 pm ---Indeed i have, thats why i was looking at the ds1000, connected to a ds2000..!!, 6 channel DSO with lots of different timebases.

--- End quote ---
@Wim13 - Which reminds me - what is the situation with the Trigger Out on the DS1000Z series? Less delay and/or jitter?

marmad:
BTW, now that the External Trigger input can be routed to the frequency counter - it makes it very easy to see the waveforms per second rate without using an external counter - or affecting the rate by turning on CH2.

Here is the Trigger Out (from a 1MHz square wave on CH1) being fed back into External Trigger In (and the frequency counter):


pa3bca:

--- Quote ---@Wim13 - Which reminds me - what is the situation with the Trigger Out on the DS1000Z series? Less delay and/or jitter?

--- End quote ---
Well I did some tests with a DS1072z trigger out to ext trigger in of the DS2072.
Input is a 2 MHz 10% pulse from a DG1032

From the screen of the DS2072 I measured a trigger out delay of abt 330 ns

You can see that there is jitter: about 8 ns. I experimented with several timebases, but these figures look to be constant.

If you want both scopes together to act as a 6 channnel scope the delay can be corrected for, but the jitter means that for frequencies > say 1 MHz the jitter becomes annoying....

marmad:

--- Quote from: pa3bca on May 21, 2014, 03:30:33 pm ---If you want both scopes together to act as a 6 channnel scope the delay can be corrected for, but the jitter means that for frequencies > say 1 MHz the jitter becomes annoying....

--- End quote ---

Thanks for the tests!

But I don't think the annoyance of the jitter would be related to the frequency of the input signal (or DUT). As mentioned before, the Trig.Out frequency is always < ~50kHz on the DS2000 - and < ~30kHz from the DS1000Z). Instead, I would think it's related to the time base setting of the DSO which is being triggered from the Trig.Out - in other words, if the time base of that DSO is set to 100ns/div or larger, the 8ns of jitter is < 1/10 a division (image #1), or scarcely noticeable - but if the time base is much smaller (e.g. 5ns/div), the jitter is a much larger percentage of the display (image #2).

Of course, the most accurate way to trigger two DSOs - if possible - is to send triggering signals from the DUT to both DSOs simultaneously - although that requires more setup.

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