Eric, We have run into the same problem here at Emulex. Our Host PC's need to provide Class B compliance - something that seems hard to find these days. We have evaluated many, many, many PCs, and in the end, decided on a Gateway 2000 Tower.
Our requirements are more stringent than most, because our add-in PCI adapters implement a 1GHz clock rate and fire off a 1GHz data signal down a 30 meter copper line. This presents problems from a chassis integrity point of view, due to the fact that we measure to 5 GHz and just about any slot is a transmitter at those frequencies. The Gateway 2000 Tower PC implements conductive gaskets instead of metal fingers at the chassis access panel, which eliminates "in-between" slots. The gaskets also seem to hold up to continuous opening of the access panel better than the fingers, which tend to break and/or bend. In addition, the Gateway 2000 PC has metal fingers installed on the ISA/PCI slots at the rear of the chassis, ensuring a good contact to the card brackets. Our analysis of the PC has shown that the unit provides 4-5 dB of margin to CISPR 22 Class B, and was verified on multiple test sites. I would recommend you give Gateway a try. Our unit is Model Number: LPMini-Tower 6P6-300. We also chose the upgraded 17" monitor which is made by Mitsubishi (Model TFV87055KHKW). It provides an excellent profile as well. Good luck on your hunt! Randy Flinders EMC Engineer Emulex Network Systems (714) 513-8012 [email protected] ---------- From: [email protected] Sent: Wednesday, March 03, 1999 3:10 PM To: IEEE EMC and Product Safety Discussion List Subject: Seeking PCs that Pass CISPR Colleagues, My (formerly) preferred vendor of Intel based personal computer systems, used for CISPR-11/22 and immunity testing of our boards and peripherals, are lately having emissions up to the Class A limit fresh out of the box - without any peripherals attached. So I must query the List Members for experience-based suggestions for make and model of a passing system that I can buy here in the USA. I need Pentium II equivalent PCI/ISA systems that pass Class A with at least 4 dB of margin and endure EN 50082-1:1992 testing on a weekly basis for most of a year. Systems that can pass EN 50082-1:1998 (or EN 61326-1:1998) would be nice but I suspect few, if any, are available. We buy about 4 new machines each year as they wear out. Please don't suggest that I complain to the PC vendor since I really don't have time to spend on the matter. I've already traded our newest PC to another department that doesn't care about EMC in exchange for an older compliant PC. I just need a long-term solution. Most importantly, please send your recommendations direct to me to minimize clutter on the list. Unless you specify not to, I'll post a summary of all comments to the list since I believe others are equally interested in the results. Regards and Thanks In Advance, Eric Lifsey Compliance Engineer/Manager National Instruments --------- 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).
