a/c Mains frequency

Discussion in 'General Electronics Chat' started by pafrazier, Jun 25, 2012.

  1. pafrazier

    Thread Starter Active Member

    Jun 4, 2011
    57
    0
    Hi,

    If I were to read the frequency of a wall socket it would be 60 Hertz. Would it have a duty cycle of 50%?

    Thanks
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,415
    3,354
    Yes. The signal is supposed to be a pure sine wave. The picture of its frequency spectrum would be a delta-function at 60Hz. If the duty cycle was not 50% it would not be a pure sine wave.
     
  3. pafrazier

    Thread Starter Active Member

    Jun 4, 2011
    57
    0
    Thanks for the info.
     
  4. bretm

    Member

    Feb 6, 2012
    152
    24
    I don't know that the term "duty cycle" even applies here. 50% duty cycle means 50% on and 50% off. That's not what's happening with a sine wave.
     
  5. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    A pure sine wave has a 50% duty cycle because exactly 50% of it is positive and exactly 50% of it is negative. If its duty cycle was different then it would not be 50-50 and it would have even-numbered harmonics.
     
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