Ari, Circuit diagram is EN61000-4-5: Figure 10. My coil was 20mH coil: www.wilcocorp.com P/N HFT-203 which has a DC resistance, R(L), of 2 ohms.
The key is minimizing R(L). Ethernet incorporates internal threshold-detection and noise-rejection; low level signals are rejected both devices on the link. Twisted-Pair Ethernet is transformer-isolated at each end to eliminate DC; signal is inherently limited due to 100-ohm source impedence. David -----Original Message----- From: ari.honk...@nokia.com [mailto:ari.honk...@nokia.com] Sent: Thursday, March 28, 2002 2:26 AM To: david_ster...@ademco.com Cc: emc-p...@majordomo.ieee.org Subject: RE: EMC test set-up for device with ethernet connection David, if you have a decoupling circuit that keeps the surge away but passes ethernet, how about posting the details here? Lots of us would be most interested! Ari > -----Original Message----- > From: ext david_ster...@ademco.com [mailto:david_ster...@ademco.com] > Sent: 27 March, 2002 22:20 > To: richwo...@tycoint.com > Cc: emc-p...@majordomo.ieee.org > Subject: RE: EMC test set-up for device with ethernet connection > > > > Richard, > > We made our own decoupler with low-resistance 20mH coils. > You really should > have an active link during conditioning. Off-line surge will > not detect a > partitioned port; if there is no link, there can be no > partition. A slow > link is better than no link. > > David > > -----Original Message----- > From: richwo...@tycoint.com [mailto:richwo...@tycoint.com] > Sent: Wednesday, March 27, 2002 12:55 PM > To: emc-p...@majordomo.ieee.org > Subject: RE: EMC test set-up for device with ethernet connection > > > > 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: david_ster...@ademco.com [mailto:david_ster...@ademco.com] > Sent: Wednesday, March 27, 2002 9:34 AM > To: jan.mob...@philips.com > Cc: emc-p...@majordomo.ieee.org > 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: jan.mob...@philips.com [mailto:jan.mob...@philips.com] > Sent: Wednesday, March 27, 2002 3:36 AM > To: emc-p...@majordomo.ieee.org > 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: > 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" > > ------------------------------------------- > 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" > ------------------------------------------- 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"
