You will not be able to transfer data when the decoupling network is added for the I/O surge test per EN61000-4-5. The data rate through the decoupler is very low. However, clause 7.7 allows you to use an alertnate test set-up. We do not use a decoupler to test our high speed network. We test the network before and after the surge application and disconnect the auxilary equipment with a relay for a short interval overlaping the surge application. We have recommended to the manufacturer of the surge generator that the IEC/CENELEC techincal committee include this test method in a revision of the standard.
Richard Woods Sensormatic Electronics Tyco International -----Original Message----- From: [email protected] [mailto:[email protected]] Sent: Wednesday, March 27, 2002 9:34 AM To: [email protected] Cc: [email protected] Subject: RE: EMC test set-up for device with ethernet connection Here is one approach: Terminations: You need actual or simulated traffic (data packets) on the LAN. Terminate cables per IEEE802.x; the LAN link is a transmission line and must be correctly terminated (by LAN card or hub). Details depend on EUT functionality. Wiring configuration for emissions and immunity should be similar. If the EUT connects to a PC only via LAN, then the PC is AE; test the EUT as a stand-alone. If there are cables (USB, RS-232) to the PC or other AE, you must decide based on typical equipment proximity. Functionality during emissions test: I prefer constant signals for reproducibility. If EUT can simulate traffic internally, terminate the Ethernet cable to a PC LAN card and shut off the PC. If EUT is not an Ethernet node, set the PC's LAN card in a loopback mode (internal test routine) to send Ethernet data through the EUT. Scan all states supported by the EUT (10Mb, 100 Mb, full duplex, half duplex). Functionality during immunity test: Actual data traffic is needed because acceptance criteria references data quality. Metrics: For unambiguous results, run a program that transfers packets (or files) and tabulates errors. Monitoring the collision rate tells you if communication is degrading (some hubs have collision rate LED's; sophisticated monitoring equipment is also available). Packet-transfer rate degradation is a secondary effect. Ethernet CRC routines resend corrupted packets, higher Ethernet levels also provide correction. Because of packet resending, bit-error rate depends on where it is monitored. Tip: Specialized Ethernet diagnostic equipment may survive immunity tests. Isolate expensive monitoring equipment with low-cost hubs. David -----Original Message----- From: [email protected] [mailto:[email protected]] Sent: Wednesday, March 27, 2002 3:36 AM To: [email protected] Subject: EMC test set-up for device with ethernet connection Hello newsgroup readers, Question about the EMC test set-up for Emission + Immunity. We are developing a product which can be connected to the ethernet / LAN/ Internet. Do we need to connect the product to a PC (with ethernet card) in the anechoic room or can we decide to place the PC outside the anechoic room. Or can we test ONLY with an cable with NO termination. What is your opinion Thanks in advance, Jan Mobers ------------------------------------------- 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] 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] 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"
