Vinod, 1. The ESD test allows reduction in function during the testing as long as it returns to normal operation when the test is complete without operator intervention. As long as these "bit errors" don't cause the system to hang it should be ok. If it hangs up to where it has to be reset by the operator, then that is a failure.
2. In section 8.3.1 of EN61000-4-2 it states, "...discharges shall be applied only to those points and surfaces of the EUT which are accessible to persons during normal use". Subsection C excludes testing of "surfaces of equipment which are no longer accessible after fixed installation...". 3. I don't understand your question for #3. PERSONALLY, If I were you, I would fix the bit error problem you are seeing when you discharge to the rear of the EUT. In my experience, even if you find a way to Pass the EUT according to the standard's requirements, these problems always come back to bite you in the butt. Fix it! Your company will end up with a better product, your customers will be happier, and you will be able to sleep better at night. Brian Kunde LECO Corp. ____________________Reply Separator____________________ Subject: Few questions on ESD testing Author: [email protected] List-Post: [email protected] Date: 9/10/04 3:02 AM Dear Group, I have a few questions on ESD testing. 1. When ESD testing a communications equipment, it is passing the tests at 4KV( Contact Discharge) and 8 KV (Air Discharge) without any bit errors on the line. However, when an Air Discharge is done on metallic surface, we are getting errors at times. Few discharges caused system hangs without any permanent damage. Is it mandatory under the EN 61000 tests have no bit errors for Air Discharge on metallic surfaces? 2. The above errors happen when the discharge is made on the rear side of the system. Since, the system itself is categorised as rack mounting do we need to do these tests towards the rear? 3. The system has passed Radiated susceptibility tests as per EN61000 standard. Do you still suspect the arcing discharge creating issue rather than the ESD effect. Regards Vinod This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/listserv/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html 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://www.ieeecommunities.org/emc-pstc This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/listserv/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html 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://www.ieeecommunities.org/emc-pstc
