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Couple of basic questions regarding power supplies

Hi - I'm going to be using a Bias Power BPS-200-2-14-50:

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in an upcoming project. I have a couple very simple questions though:

It has an "EM" pin, and for it's description it just says "see emi app note". This app note is no longer available. I did find an archived version of the website that refers to the EM pin here:

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it says "for connection of external Y capacitors to reduce EMI in certain applications". Can somebody tell me what Y capacitors are? Or if this is even needed?

Also - this power supply will be powering an RF circuit. I am wondering - should I connect earth ground to the ground pin on the power supply? I'm very unsure about this, and figure it's most safe to ask first.

Thanks,

-Michael J. Noone

Reply to
Michael Noone
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--
From:

http://www.savoy-hill.co.uk/sales.htm#X%20&%20Y%20rated%20capacitors 


"X & Y rated capacitors   These capacitors are specially designed for
connecting directly to the mains. 
Class "X" capacitors are designed for connection directly across the
mains supply there are two sub classes used "X1" rated units are for
heavy duty applications and are made to withstand 4K Volt peak pulses.
"X2" are designed for general use and can withstand 2K Volt peaks.
"Y" rated capacitors are designed for connection between a current
carrying conductor & earth. They are designed not to pose a threat of
electric shock in the event of failure."
Reply to
John Fields

i came across some references about capacitors for power supply,it just might help you and it just might answer your questions try to click to this links

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i hope that it will help you,it sure helped me.

Reply to
mhyk

John Fields wrote in news: snipped-for-privacy@4ax.com:

Hi Mr. Fields - Just to clarify - do you think that they are saying to connect a Y capacitor between the EM pin and earth ground? Also - in what sorts of situations is this needed? This device will be running inside off of wall power - would such a capacitor be needed? I'm thinking probabaly not, but I thought it best to ask to be sure.

Thanks,

Michael

Reply to
Michael Noone

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