Rigol and Multiple triggering - individual triggering on each channel

[marmad]

I 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?

[marmad]

There's an apparent limitation of about .92 division below which triggering is impossible. Probably as per design, but good to know.

I don't know what's going on with your DSO, but I have absolutely no problem triggering at any level - no limitations (see images). Have you tried running a self-calibration?

[marmad]

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.

Again, I'm not sure why you're having problems (or if your DSO is functioning correctly), but I don't really have a problem getting a stable display using the Delay trigger. It usually takes a little playing around (both channels have their own trigger levels, etc), but eventually I can get the DS2000 to lock onto both waveforms stably.

[rstoer]

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.

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.

I, for one, used ALT triggering more than occasionally on my Owon, which I recently replaced with a fully loaded Agilent MSOX2022A.
Now there's no question that in most ways the Agilent shines in comparison to the Owon but there are some things I miss - foremost among them is ALT triggering. I can't believe that with today's technology this can't be achieved at a decent price point. In fact, I wonder why we can't have a reasonable priced dual time base scope, with ALT triggering relegated to entry level equipment.
I guess I'm alone in this but I can't imagine what the use is of having four analog channels without ALT triggering or a dual time base.

[Gixy]

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!

[marmad]

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'm happy to hear that fixed it - and glad I could help!

[marmad]

I, for one, used ALT triggering more than occasionally on my Owon, which I recently replaced with a fully loaded Agilent MSOX2022A.

There are nice things about the Agilent 2000 X-series, but the triggers are not one of them; it has a really weak assortment of triggers - having just the Pattern trigger as it's sole trigger which can accept two inputs.

[donmr]

I 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.

[marmad]

Yes, 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.

[donmr]

Yes, 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.
It might work for my situation too, I'd have to see it used that way.

Thanks for your info.

[marmad]

The description in the User's Guide looks like that expects two synchronous signals and tests for the skew.

No problem. We've already been discussing the fact that it can be used on two non-synchronous signals in this thread - quite similar to the Alternate trigger - and I've posted two images in previous posts, here and here, showing stable triggering on two wildly different frequencies from different sources.