If you are triggering from a different channel then you need to select which channel that is in the trigger menu.
Also set the trigger level to get the best rising edge, where it is in the image could result in irregular triggers.
Yeah, for some reason I can't permanently set EDGE trigger for both channels. If I turn on edge for one channel, the other channel trigger is null. And so I must manually do it. Weird.
You're in the DSO world now and not all CRO features migrate to DSO's, ALT triggering a fine example.
Also very weird is the cold start ...
If I've had the unit off -- unplugged - - for, say over a few hours or longer, and re-start, I have very rough 15-20 minutes of 'settling-in time'. Nothing locks (trigger), As I rotate the vertical or horiz., or other buttons, I can monetarily see the correct signal. This even applies to something as simple as the 1k square wave /ground tab on the from. The first test of 'scope reliability.
And then -- after 20 min or so -- normal. Very weird!
1/ Previously you have been asked but haven't responded which firmware version is installed ?
To be up to date Sys Info in the Utility menu should display Version V1.3.26
2/ This DSO should perform perfectly from the moment it is powered ON on one proviso, it has previously been powered OFF correctly.
That is with a 2s press of the power button to allow the instrument to power down in a controlled manner and save all previous settings.
If by chance firmware is up to date and scope is still playing up press Default to return the instrument to factory settings.
I have not used this 'scope enough to establish some sort of what-is-normal behavior.
Yes, that is evident and you really need spend more time with it to learn all its features.
First for me is what I see on the display which tells me heaps about how you have it set and how you have used it.
We are here to help and first exercise is to grab a USB stick and learn how to capture screenshots to it by just pressing the blue Print button. These captures are just a few 10's of KB not some 2.5 MB monster done with a camera.
Cleverly done you can capture an appropriate menu too to convey to us more info on how you have the scope set up.
Learning to use the power of the scope starts with setting channel input attenuation and probe attenuation correctly
so measurements are correct which removes the need for mental arithmetic on the fly to arrive at waveform values.
Typically we set the probe and channel attenuation to 10x
and leave it there. Each probe also needs to be assigned to a channel by fitting the colored rings and in 10x mode compensated.
Looking forward to seeing more of your work.