Hi all, I don't have a good spectrum analyzer and have a question: Do the harmonics of a fundamental frequency actually have more jitter or is it all 100% phase-locked?
You are asking about jitter, which is about the time domain, yet talking about a spectrum analyzer and asking about phase, thought a SA usually measures the magnitude of the harmonics in the frequency domain, and does not measure the phase. An SA is to display the power distribution of the given signal into its harmonics, and phase doesn't matter.
Time jitter and phase noise are not the same. In general, the longer you wait to measure time deviations, the larger the observed time jitter (relative to where you would expect an edge of a signal to be).
Harmonics are "phase-locked" with the fundamental, or else (if the phase of harmonics wouldn't be locked) that would mean that the fundamental changes its shape in time, so it wouldn't be a periodic function any more.
What exactly do you want to measure, or to find out, or in what context is the question you were asking?