Kris, In my reading of the standard, and the next modificaiton will include that clearly, you need to test discharges to the shell of the USB connector, as there will not be a connector in there all the time.
There is another strong arguemnt: The user might plug a charged (e.g. hand-held) device into the USB port. Of course, the main criteria is survival, as you cannot test connectivity if there is no USB device. But if you have multiple USB connectors, another USB device might loose connection when discharging to a different USB connector. David Pommerenke From: Carpentier Kristiaan [mailto:carpenti...@thmulti.com] Sent: Wednesday, January 22, 2003 10:48 AM To: emc-p...@majordomo.ieee.org Subject: ESD Contact discharge fitted connector Hello group, A Class II product has 3 interfaces. 2 interfaces have plastic connectors, with no metal shell. 3rd interface is USB plastic connector but with metal shell. The housing of the product is plastic (non conductive) The USB connector is fitted with a USB plug molded in plastic. Test set-up for immunity testing (ESD) is done with all interface plugs connected to verify performance of all interfaces. Consequently, no conductive parts are accessible and contact discharge must not be applied. But the product can also used without USB connection; the USB connector shell becomes then accessible. Question: Is ESD Contact test required on USB connector without plug taken into account that USB performance cannot be monitored at that time (and the other interfaces must be verified in another way)? More generic: can we exclude ESD contact testing by fitting all connectors with plugs on a product ? FYI: IEC61000-4-5+A1+A2 states that Contact ESD is not required (par 8.3.1 c) for "those points and surfaces of equipment which are no longer accessibel after FIXED installation or after following the instructions for use". Regards, Kris 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org 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"
