Steerpike_jhb wrote:MelodyMaster wrote:That would be 59.97 Hertz, which is virtually the maximum allowed slowdown during peak power consumption periods in Canada. (The system runs fast overnight to catch up, average frequency over the full day must be exactly 60 Hz to several decimal places.)
D'OH! I forgot they changed the TV frame rate for colour, oops I mean 'color'. 59.94 Hz I believe. Still for PAL and SECAM countries, it is exactly 50.000Hz
I measured quite large instantaneous changes in mains frequency, which would have an impact on synchronous turntables, although would not show up at all in a daily average.
Such ac-mains frequency fluctuations would show up on a strobe disc illuminated by a tv set; even if the tv frequency is "off" by 0.1%, it remains rock-steady.
Sorry, I meant 59.94, I was thinking field rate which is 29.97. I'm a TV tech yet I always make that mistake.. But no, a TV can't be used for strobe reference here.