[Robotgroup] EMI suppression on power supply

[Def Egge]

I am looking over a non-functioning power supply (removed from a 
mid-1990s desktop system).  I see at the 110VAC power connector a 330 
nF capacitor (p/n RIFA PHE-830 M) installed between the 100VAC hot 
and neutral leads, I presume, for EMI suppresion.  Is this correct?

The leads of the capacitor are, in turn, connected by a 500 ohm 
(according to my DMM) 1/4-watt resistor (green-red-brown-gold).  The 
gold band indicates 5% tolerance, so this is a 520 ohm resistor (+/- 
26 ohm), correct?  What is the purpose of the resistor?  Curious 
minds desire to know more.


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All the best....

Mike