This. In Florida US grid zero crossings randomly bounce around +/- 20nS over a f...

		howard941 on March 7, 2018 \| parent \| context \| favorite \| on: Continuing frequency deviation in the Continental ... This. In Florida US grid zero crossings randomly bounce around +/- 20nS over a few seconds. Viewing the waveform on a scope can be enlightening (or inflammatory and shocking if one's not properly isolated)

I would be willing to bet that this is noise.