While working at an independent test lab, I came across a similar situation. The maker of the Video Adapter we were testing would not come into compliance without the use of an external ferrite. The manufacturer could not supply the ferrite on a cable, because the user could use any monitor. We asked the FCC for advice (This was before CE-Mark), and they told us that the unit must be shipped as configured during the test. The manufacturer of the product was able to ship the product with a clamp-on ferrite, and had to include instructions in the user manual on how to install the ferrite.
My take on your situation is that the unit would not be considered compliant if it were shipped without the ferrite. The user may not be technically versed enough to understand why to use a ferrite, which type of ferrite to use, or how to correctly install it. When applying the CE-Mark, the importer (or manufacturer) is stating the unit, as shipped, complies with all applicable directives, including the EMC Directive. The only way to get it through in my humble opinion, (take it for what it is worth) is to ship the ferrite with the unit and provide detailed user instructions on how to install it. -- Sincerely, Randall T. Flinders EMC Engineer Emulex Network Systems V: (714) 513-8012 F: (714) 513-8265 [email protected] ______ ______ ______\ /______ ______/ \______ E M U L E X Chairman Orange County Chapter IEEE EMC Society [email protected] ---------- From: [email protected] Sent: Friday, June 25, 1999 12:36 PM To: [email protected] Subject: emc compliance Here's a question.... If you have a product that, at one particular frequency during radiated RF, you simply cannot get to pass the requirements of the relative CE standard without putting an external ferrite on the cable, is it "legal" , to still mark it, provided you inform your customers via the declaration of conformity or in the manual etc., that they could experience problems at such and such frequencies and if they do, to use a ferrite? (boy, that was a mouthful). Faced with a redesign or a statement, the words would be the easier route to take, since in this case, the customer could probably never see the problem frequency range. Comments? thank you for any advise, Lisa --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators). --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
