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Subject: HELP: EMI - CFR 47 Exemption for Machine Controls ?
Author: Georg M. Dancau 100536.2...@compuserve.com at UNIXMAIL
List-Post: emc-pstc@listserv.ieee.org
Date:1/7/97 4:57 AM
Dear Compliance Collegues
CFR47 sets emission limits for digital
section 121 allows for exemptions for certain
ultrasound and MRI equipment. Other than that, I'm certain you have to comply!
Best Regards,
Hans Mellberg
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Subject: HELP: EMI - CFR 47 Exemption for Machine Controls ?
Author
Dear Compliance Collegues
CFR47 sets emission limits for digital devices. As far as I know
there is or there was an exemption for machine controls, i.e. there
are no emission limits for industrial machines ( I am not referring to
ISM as defined by 47CFR18)
I can not find this exemption in the
.
inet @ icanect.net
09/04/96 03:55 PM
To: emc-pstc @ ieee.org @ SMTP
cc:
Subject: Acoustics Standards - Help
Good Afternoon,
I am in the process of developing an internal design standard for acoustical
noise limits on medical laboratory equipment.
Could anyone please post any
Good Afternoon,
I am in the process of developing an internal design standard for acoustical
noise limits on medical laboratory equipment.
Could anyone please post any information regarding any existing standards
(IEC, UL, EN, even OSHA)? Your help would
be greatly appreciated.
Thanks
and changing all of this may not help. But hey,
consider the advice worth what you paid for it!
Regards,
tony_fredriks...@netpower.com
--
From: Max
To: Tony Fredriksson
Cc: emc-pstc; mkelson
Subject: Re: Need EMC Help With Video Card
List-Post: emc-pstc@listserv.ieee.org
Date: Thursday, August 29
Mike,
Thanks for the information. I wish I had tried moving the wires against
the chassis or putting ferrites on the fan wires.
I'm not sure what I could do about this from a practical view point,
though, except to look for another PC. I doubt if the FCC would allow
you to modify the PC.
Max
On Aug 29, 10:19am, Max wrote:
Subject: Re: Need EMC Help With Video Card
I still have the problem when I remove all of the
cables from the system,
including the printer cable, etc. The emissions are
coming out of the
holes in the PC cabinet and this is a very good PC
and is well sealed
%
%
%Max,
%
%At what frequency or band of frequencies is the problem occuring?
Our video clock operates at 126 Mhz. The frequency synthesizer seems to be
deriving this from a 31.5 Mhz clock, so it produces harmonics at 31.5,
63.0, 95.5, 126.0, 157.5, 189.0 220.5, 252,0, 283.5, 315.0, 346.5,
of.
Thanks,
tony_fredriks...@netpower.com
--
From: Max
To: emc-pstc
Subject: Need EMC Help With Video Card
List-Post: emc-pstc@listserv.ieee.org
Date: Wednesday, August 28, 1996 9:24AM
I'm presently having an EMI problem with dot clock emissions from a PC video
card. Adding additional ground
I'm presently having an EMI problem with dot clock emissions from a PC video
card. Adding additional ground layers isn't an option since I'm already at
the maximum. The return plane is connected to the chassis on this card and
the video cables are very good. The emissions are coming right out
Mirko Matejic
The Foxboro Company
--
From: Brian Kunde
To: emc-p...@ieee.org
Subject: Please Help! Need EMI Shield for LCD Panel!
List-Post: emc-pstc@listserv.ieee.org
Date: Monday, July 29, 1996 9:21PM
Now that I need one I can't find one.
I am in need of a transparent shield
Now that I need one I can't find one.
I am in need of a transparent shield that will go over a 9 inch diag.
LCD Panel. Years ago I had vendors knocking down my doors with these
cheep shields that where made from a fine conductive screen material
with a small frame and a drain (ground) wire.
Dear PSnet members,
I am looking for information how to bring telecom equipment (CPE)
into the following countries: Mexico, Germany, Italy, Saudi Arabia,
and Japan.
What are practical procedures, approvals, and authorities?
Any information and advices are welcomed and appreciated!
Thanks !
Bao
For Canada, contact Duncan Gifford, 613 952 2552;
For Part 68, send me name address and I will mail you our Application
Guide.
For Part 15, contact Charles Cobbs, FCC Lab, 301 725 1585 x204
For power safety info, contact Randy Ivans at UL at 516 271 6200 x
22269
Laurence,
sounds like you are into CATV coax in which case you should look at
FCC part 76. The tech part that is.
You do not seem to connect to telephone system so you do not come
under FCC part 68 or Industry Canada equivalent.
It is in a residential area thus you are subject
Contact Duncan Gifford, Industry Canada, for Canadian requirements.
His fone: 613 952 2552.
For the US: Part 68 for telecom. Send me your name address.
For EMC, contact Charles Cobbs, FCC Lab, 301 725 1585 x204
For power safety, contact Randy Ivans, UL, 516 271 6200 x 22269.
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