I am new here so my apologies if I am missing pertinent details. I am trying to cancel a 60Hz EM field by sending a small 60Hz AC current through a loop of wire that I am generating with a function generator (HP33120A). It works extremely well when the two signals are out of phase. The problem is that line phase (or the phase of the field I want to cancel) is fluctuating enough that eventually the waveforms align and add. I have tried to create a Schmitt trigger with a LM741 opamp to externally trigger the function generator but I need to have a burst of 10 or more cycles to have a consistent output and it adds significant field noise away from the 60Hz peak.
So, my question is, is there a good way to match the output of a function generator to line phase? Or maybe, is there a good way to phase shift the line signal so that I can use it directly?
I am no expert but, maybe my trigger is poorly designed? Is it possible to purchase a Schmitt trigger in a chip that will function better than a home designed one? the rise time on the trigger signal is quite high, on the order of microseconds. Is it possible that this is limiting my ability to have a burst of only one cycle?