Bonjour de Montreal, I've been doing this for years, the special requirement by the FCC is that when your Class A device is installed in a Class B computer and functioning, the overall system is considered Class A. But when your Class A board is installed and not functioning, the system still has to meet Class B.
Your right about the fact that the board has to be tested in a typical system configuration (PC+Monitor+Keyboard+mouse+serial port device+parallel device+speakers+USB device, etc.. any different I/O port must be connected), the trick is to find peripherals that do not emit to much noise. Also you have to consider the different modes of operation to find the worst case (this is particularly troublesome for Graphic cards as the different resolutions are expanding all the time). Hope this help, At 03:09 PM 3/23/2000 -0500, [email protected] wrote: > >Scott, if your PCI card is not marketed to the general public, then it may >be sold as a Class A device. The FCC rules contain provisions for compliance >testing a Class A card in a Class B computer. This has been a common >practice with some video card manufacturers. > >Richard Woods > > ---------- > From: Scott Douglas [SMTP:[email protected]] > Sent: Thursday, March 23, 2000 1:49 PM > To: EMC-PSTC (E-mail) > Subject: PCI Cards & EMC Testing > > > Hello Group, > > Our company recently acquired another company and a compliance >project has > immediately popped up. An ITE product was previously tested and >found to be > compliant. This product incorporated the chassis/motherboard of a >386 type > computer as the main controller internal to the product. The design >is now > changed to remove this built-in computer and move the controlling >functions > off to a new & proprietary PCI card that will be installed in a user > supplied NT workstation. > > When I go for EMC testing, I presume I will have to put a sample >host > computer with our PCI card installed on the turntable and include it >in all > the tests. I also assume that the full system must be compliant, >including > the "sample" host computer. > > Would anyone care to share with me their experiences in this type of > testing? Please include gotcha's to watch out for, brands/models of >hosts > that work well and anything else that may smooth the process. BTW, >we have > always done Class A tests because this is not home use equipment. >But, given > the PCI card goes in a possibly home computer, does the card and/or >system > now have to be Class B? > > Anything else I should know? > > As always, thanks for your input. > > Scott > [email protected] > ECRM Incorporated > Tewksbury, MA USA > > > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > To cancel your subscription, send mail to: > [email protected] > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Jim Bacher: [email protected] > Michael Garretson: [email protected] > > For policy questions, send mail to: > Richard Nute: [email protected] > > >------------------------------------------- >This message is from the IEEE EMC Society Product Safety >Technical Committee emc-pstc discussion list. > >To cancel your subscription, send mail to: > [email protected] >with the single line: > unsubscribe emc-pstc > >For help, send mail to the list administrators: > Jim Bacher: [email protected] > Michael Garretson: [email protected] > >For policy questions, send mail to: > Richard Nute: [email protected] > > > > -------------------------------------------------------------------------- Benoit Nadeau, ing. M.ing. (P.Eng., M.Eng) Gerant du Groupe Conformite (Conformity Group Manager) Matrox <http://www.matrox.com/> -------------------------------------------------------------------------- 1055, boul. St-Regis Dorval (Quebec) Canada H9P 2T4 Tel : (514) 822-6000 (x2475) FAX : (514) 822-6275 Internet : [email protected], <mailto:[email protected]> ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected]
