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Couple of basic questions regarding power supplies

M

Michael Noone

Jan 1, 1970
0
Hi - I'm going to be using a Bias Power BPS-200-2-14-50:
http://web.archive.org/web/20050601113831/http://www.biaspower.com/BPS200%
20Spec%20Sht%20A3%20_22604_.pdf 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 I did find an archived version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:
http://web.archive.org/web/20040404075831/www.biaspower.com/product2.htm 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
 
J

John Fields

Jan 1, 1970
0
Hi - I'm going to be using a Bias Power BPS-200-2-14-50:
http://web.archive.org/web/20050601113831/http://www.biaspower.com/BPS200%
20Spec%20Sht%20A3%20_22604_.pdf 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 I did find an archived version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:
http://web.archive.org/web/20040404075831/www.biaspower.com/product2.htm 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?

---
From:

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


"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."
---
 
M

Michael Noone

Jan 1, 1970
0
From:

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

"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."
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
 
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