Amendment 1 to CISPR 22:1997 (Amendment A1:2000 to EN 55022:1998) requires that the clamps provide at least 15 dB of loss in a 50 ohm system over the frequency range of 30 MHz to 1000 MHz. The use of extension cords is prohibited. Can you guarantee that your bucket of doughnuts will meet this requirement? How will you demonstrate that to your lab's accrediting body?
Fischer's clamps are around $300 each. Compared with what we had to choose >from prior to their product, these are not big bucks. Ghery Pettit Intel From: [email protected] [mailto:[email protected]] Sent: Tuesday, January 28, 2003 9:22 PM To: [email protected] Subject: Re: EN55022:1998 + A1:2000 Instead of paying big bucks for the clamps (I am not sure what the price is, but I'm sure it is too much anyway :), why not buying a bucket of ferrite doughnuts that can be used over cables. Or, when possible, building in-line adapters out of sections of cables (maybe 1m long) and lining them up with ferrites. I'd select a combination of ferrites to cover 30 MHz to about 300 MHz. The high frequencies will be radiated anyway by the segment of the cables close to the DUT. Taking a little more thorough approach, I'd check the impedance with the lineup fixed over a defined height above a GND plane. (Not sure if that would make a big practical difference.) Neven > > A1 to EN55022:1998 requires the use of ferrite clamps on all cables leaving > the table-top EUT for a connection outside the test site. Are there any > other manufacturers of these clamps other than Fischer Custom > Communications? > > Richard Woods > Sensormatic Electronics > Tyco International > > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > [email protected] > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Ron Pickard: [email protected] > Dave Heald: [email protected] > > For policy questions, send mail to: > Richard Nute: [email protected] > Jim Bacher: [email protected] > > All emc-pstc postings are archived and searchable on the web at: > http://ieeepstc.mindcruiser.com/ > Click on "browse" and then "emc-pstc mailing list" This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
