FFT PC POWER SUPPLY

Discussion in 'General Electronics Chat' started by tim90, Jan 19, 2016.

  1. tim90

    Thread Starter New Member

    Jan 15, 2016
    20
    0
    I to everybody, I have to analize the spectrum of a pc power supply. I connected the 3.3V output of the power supply and what I got is the following one:

    armoniche.JPG

    Sorry for the graph. I wanted to know if it is possible to understood the meaning of each harmonichs, why we have some harmonics in thet particular frequency (for examples i know that 244 Hz harmonic is due to the home power supply), and how the amplitude (mV) is related with my signal, i mean why I have a dc component of 8.5mv with a dc signal of 3.3V, what does it means?another information is that the signal on the oscilloscope had 200mV for division vertically.
     
  2. tim90

    Thread Starter New Member

    Jan 15, 2016
    20
    0
    I think (i am not sure) that i got 8.5mV because i was using the AC coupling in the oscilloscope sittings.
     
  3. alfacliff

    Well-Known Member

    Dec 13, 2013
    2,449
    428
    you are seeing noise generated by the switching supply and its harmonics.
     
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