A proximity card reading security system is used in a company, possibly based on the Wiegand Effect. Some of the employees put their security cards in their wallets to have them all the time. When needing access to an area that requires a card, users simply pull out their wallets, swipe the wallet in front of the reader and thus gain access. For those people with cards in their wallets, they do not pull the security card out of the wallet and then swipe the reader. They all swipe the reader with the wallet.
A question was posed to me that involved the swamping of the card with a magnetic field to identify the card. The electronics in the card generates a series of pulses from the pulsed magnetic field that when received by the card reader validate or invalidate the card. Is this field strong enough to wipe any magnetic strips on any credit or bank or any of the other types of cards using magnetic strips that may also be in the wallet? Regards, Doug McKean ------------------------------------------- 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"
