Bit OT.
This kind of case can use also for many kind of exercises for learn different ways to use oscilloscope, specially when we want find and analyze some glitches or anomalies in signals. Of course this is just one individual example but also it may give some idea how to use oscilloscope bit more advanced way.
Here is one (quite good also) method for find if there is "something". Using persistence. Of course we have wfm/s update rates and intensity grading etc but no need stress user eyes for watch if there just blink something.
So, this method is one first method for finding "something" what we do not know. But as we can see from this image can not analyze nearly anything, only we can see there is something wrong. If situation is rare, just let osciolloscope do work and go to coffee.
Oscilloscopes today, specially oscilloscopes what have true digital side trigger system, may have couple of powerful trigger features what we can use for more deep analyze what is really going on. As in upper image we have found there is something, but example here we can see much more. Of course this method need that we know something about what we are trying analyze. (persistence method is one way to first find some kind of vision what is there perhaps.
Because we want know what happends in other channel (CH1) what need be rock solid when we adjust other channel. We know what is signal in CH1. We need find if there change something. We can of course do mask test. Take CH1 signal and do mask. Then set it so that if signal fails inside mask scope stop and we see this situation. (yes I did it and there I see signal really drops out totally after do freq change in generator CH2 and in this case CH2 was not at all connected to scope.)
In this position I want see all things what happend there when CH2 change and result is CH1 drop out.
Here come Trigger.
Now I know how long time drop out continue.
I set trigger for CH1 and so that scope do acquisition only if trigger detected. (So, Auto trigger is not suitable, set for Normal what means scope do whole acquistion only if it trig.)
Then I want it trig only if it see signal is under trigger level over time what I set, because now I know that there is break in signal.
Also connected CH2 to scope CH2
After these adjustemnts are ok.
Now I change generator freq and every single time I do it, scope is trigged (and only when I change CH2 freq) and I can see new trace on the screen.
After then I can adjust scope so that I can see both, exacly when CH2 freq change and this signal break bit later. Now using zoom it can also analyze more deeply.
Rigol also have powerful trigger functions so this is nice case to exercise study how to use scope independent of brand.
In oscilloscope course this lesson "how to use oscilloscope bit more powerful way" it cost least 1000 and here it cost only one cheap SDG1000.
Basic trigger functions are very important to be familiar. Oscilloscope can be used very effectively when user is familiar with many kind of triggering functions and aplications.
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