Please spend some time in the Utility menu and learn how to phase lock channels etc.
You mean track on in the Channel coupling? Well channels are coupled with track on and zero phasedev.
It still gives the same result. (About the resolution, one can enter 0.1 mdeg and is a bit way too optimistic.)
If I set the phasedev to -12 degegree, the two sine outputs are completely in phase. Note that this is at 120MHz.
When I go down in frequency e.g. to 50MHz, the outputs do not stay lined up. The phase difference is -5 deg @50 MHz.
In other words, phase difference between the two channels is frequency dependant.
I think you've got the skew calculation backwards (reverse to be CH 1-2), so the real skew measurement is about 257 ps.
Edit: Also, I'm not sure if I'm reading the Keysight scope screenshot correctly, but should you change the channels in the skew (Delay) measurement to be both rising or both falling edge?
You are right, trap for young players I presume
See figure :
Regardless of the way of calculating, my unlocked SDG2042 has a similar phase deviation between it's outputs as yours (@120 MHz with channel locking on).
Thanks, so at least two instruments have this problem reported. Would be nice if more people test their equipment. Better yet, with way better scopes. Mine is only 200MHz bandwidth with only 30 ps time resolution. (Perhaps I will liberate it into a 500MHz scope in the future. It involves some component changes on the frontend.)
I'll have to look into that phase calibration procedure you mentioned too.
Perhaps Tautech could elaborate on this....
What does it exactly, does it need to be performed after a firmware update etc.
I'm not sure what the spec is (or if one exists) for output phase alignment between channels on the AWG...
I've been looking at the spec sheet. I cannot find anything about this. Perhaps I do not quite know the correct definition of this discrepancy.