While I don't usually use that standard, let me say some thoughts on this. 1) That's the difficult part. If your interface allow a longer cable, you can use an additional section of shielded cable (maybe some 20-30 m, or more) in series of the unshielded cable, and utilize the capacitive coupling from wires to shield. Shield is then connected to ground with suitable resistor. The common mode impedance is formed by the capacitance and resistor is series. Long cable will make some resonance problems that need to be attenuated by ferrites and such. Needs tuning but finally it will work.
Check first if any IEC 61000-4-6 CDN's are available, they are also 150 ohm devices. 2) If not possible to terminate, I would not do it; just connect the real peripheral device. 3) yes Regards, Ari > -----Original Message----- > From: owner-emc-p...@listserv.ieee.org > [mailto:owner-emc-p...@listserv.ieee.org]On Behalf Of ext T.Sato > Sent: Monday, November 29, 2004 6:42 AM > To: emc-p...@ieee.org > Subject: EN 61000-6-3 conducted emission test for signal, > control, d.c. > and other port > > > Hello all, > > EN 61000-6-3:2001 (generic emission standard) includes requirements > for conducted emission for "signal, control, d.c. power input, d.c. > power output and other". > The standard uses CISPR 22 as the basic standard here, and it says > "Current probe measurement with line terminated to reference plane > via 150 ohm" (in Table 1). > > I could find no exemption in the standard, so I believe every > electrical connections of the equipment should fulfil the emission > requirement when the standard is to be applied. > > > Questions here are: > > (1) If the cable is not shielded, where should we connect the 150 ohm > termination resistor? > > All the conductors in the cable should be terminated? > Or else, termination of one of the conductors (for example > the signal > ground conductor) can be enough? > > (2) What should we do when it is not possible to terminate > the conductor > in the cable, for example due to the functional reason > (i.e., terminating > the conductors can make the equipment unfunctional) ? > > (3) If the cable is shielded, I think we simply terminate the > cable shield > with 150 ohm as usual? > Or "line" here means a conductor in the cable? > > Regards, > Tom > > -------------------------------------------------- > Tomonori Sato <vef00...@nifty.ne.jp> > URL: http://homepage3.nifty.com/tsato/ > > ---------------------------------------------------------------- > 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 emc-p...@ieee.org > > 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: emc-p...@hypercom.com > Scott Douglas emcp...@ptcnh.net > > 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://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 emc-p...@ieee.org 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: emc-p...@hypercom.com Scott Douglas emcp...@ptcnh.net 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://www.ieeecommunities.org/emc-pstc
