Not having had a product with this variability, I can't offer much from experience. However, I would think that not all tests have to be performed at all frequencies. Conducted and Radiated emissions and immunity definitely - board layout vs.operating speed vs.wide frequency range of these tests. unfortunately these tests are the more costly. For the other tests like ESD, EFT, Surge, etc where the frequency of the disturbance is fixed, and all else in the product being consistent, I would take into account which of the 5 five CPU frequencies would most likely be affected and perform the test accordingly. Perhaps I've oversimplfied this? Best of Luck. John A. Juhasz GE Interlogix Fiber Options Div. Bohemia, NY -----Original Message----- From: Sam Wismer [mailto:swis...@acstestlab.com] Sent: Thursday, January 02, 2003 11:23 AM To: EMC Forum Subject: Multiple CPU Options
Group, Happy Holidays. Thank you for your responses to my last post concerning AC Power sources. I got a lot of good information. Next question: Client has a product that he is offering with various CPU types and speeds(5 to be exact) and is pursuing CE compliance. That is the only difference between the variants. I don’t see how he can get away without testing all of them entirely since the intent of the immunity testing is evaluate the susceptibility of the product. I don’t think there is room here for engineering justification of a worst case configuration. What about emissions? Is it feasible to do a pre-scan on all configurations and a final on the worst of those? I’m pretty sure what you all are going to say, but wanted to be extra certain when we present a significant quote to our customer. I would appreciate any comments as to how we can offer some cost savings measures to our client without compromising total compliance of his system. Kind Regards, Sam Wismer Engineering Manager ACS, Inc. *Tel: (770) 831-8048 *Fax: (770) 831-8598 *Web: www.acstestlab.com * <******************************> swis...@acstestlab.com
