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I need to "arm" on the t2 edge, then trigger on the t3 one.
There's an apparent limitation of about .92 division below which triggering is impossible. Probably as per design, but good to know.
In dual traces mode (object of this thread), although the two signals have the same frequency, it is quite impossible to stabilize both perfectly. The best result is achieved with Delay triggering, but it's not as stable as the Vert (thanks David for your explanation) triggering of the Tek.
Quote from: David Hess on October 28, 2014, 05:09:29 pmNon-DPO oscilloscopes also lack it so I suspect it is because there are other ways to achieve almost the same thing and a lack of demand for dual timebases. There would be some duplication in things like the decimation and reconstruction stage but for performance reasons, that duplication may already exist. Alternate triggering should be easy but they lack that as well with the mentioned older Rigol being a notable exception.Virtually every older generation, low-cost DSO (Rigol, Owon, Hantek, Siglent, etc) has Alternate trigger - and virtually every newer generation, low-cost DPO (Agilent, Rigol, Siglent, etc) does not. Most people that use oscilloscopes are familiar with the feature and find it handy from time to time - so I doubt it was just a simultaneous decision by every manufacturer to drop the feature at the same time. I think it's implementation on the newer DPOs is made difficult/time-consuming by either the DPO architecture or digital triggering.
Non-DPO oscilloscopes also lack it so I suspect it is because there are other ways to achieve almost the same thing and a lack of demand for dual timebases. There would be some duplication in things like the decimation and reconstruction stage but for performance reasons, that duplication may already exist. Alternate triggering should be easy but they lack that as well with the mentioned older Rigol being a notable exception.
Ooops,After calibration, things changed a lot: trigerring is now independent of V/div and stabilization is much better in delay mode.Strange, as this unit was last factory calibrated in june...Anyway, it works now, thanks for your help Mark!
I, for one, used ALT triggering more than occasionally on my Owon, which I recently replaced with a fully loaded Agilent MSOX2022A.
Quote from: donmr on October 28, 2014, 10:03:32 pmI need to "arm" on the t2 edge, then trigger on the t3 one.Isn't it just (CH1=H AND CH2=RE); a simple Pattern trigger?
Yes, sorry, I should have shown the signal on CH1 as a pulse.
Quote from: donmr on October 29, 2014, 05:43:48 pmYes, sorry, I should have shown the signal on CH1 as a pulse.Now it just seems like the Delay trigger on the DS2000 could handle it easily - just set both CH1 and CH2 to RE, and the delay to < the maximum you want to be considered the 'arming' time.
The description in the User's Guide looks like that expects two synchronous signals and tests for the skew.