Chris, Thank you for your reply.
In the situation where you are injecting into the mains but must still be connected to the peripheral through the bus, how do you decouple the bus? Taking this one step further, it is my understanding that the ferrite clamp does not decouple well at low frequencies, such as 150 kHz. It would seem that the objective of the decoupling is twofold -- to protect the peripheral from upset, and to insure that the peripheral does not corrupt the test signal being coupled to the EUT. It does not seem that a ferrite based decoupling clamp would be very good for these 2 points at frequencies below about 10 MHz. What has been your experience in this regard? Even more curious, Don Umbdenstock > ---------- > From: Chris Collin[SMTP:[email protected]] > Sent: Tuesday, August 01, 2000 7:12 PM > To: [email protected] > Cc: [email protected] > Subject: Re: EN 61000-4-6 CDNs for a high speed bus. > > Don, > > If no CDN networks are suitable - and indeed they are not for high > communication lines -, you should consider the possibility to use the > EM-clamp as described in EN61000-4-6. That's the way we perform tests > without degradation of the EUT signals. > > Regards, > > Chris > > On Tue, 01 August 2000, [email protected] wrote: > > > > > > > Hello Friends, > > > > We are getting into faster interconnects that can be affected by the > CDNs > > called out by EN 61000-4-6. > > > > Has anyone tested a system consisting of an EUT connected to various > > peripherals by USB, Firewire, 10 Base T or other bus configurations > > considered "high speed" today? It seems decoupling by an inductor > 280 > uH > > @ 150 kHz as indicated in the various CDNs in Annex D should cause > > considerable signal integrity issues even before the test signal is > applied. > > > > If you have tested high speed interconnects to EN 61000-4-6, how did you > > manage the signal integrity issues? Special CDNs? Special test setup? > > This seems like a topic everyone would be interested in. > > > > Just call me curious, > > > > Don > > > > (not George) > > > > ------------------------------------------- > > This message is from the IEEE EMC Society Product Safety > > Technical Committee emc-pstc discussion list. > > > > To cancel your subscription, send mail to: > > [email protected] > > with the single line: > > unsubscribe emc-pstc > > > > For help, send mail to the list administrators: > > Jim Bacher: [email protected] > > Michael Garretson: [email protected] > > > > For policy questions, send mail to: > > Richard Nute: [email protected] > > _______________________________________________________________________ > > Free Unlimited Internet Access! Try it now! > http://www.zdnet.com/downloads/altavista/index.html > > _______________________________________________________________________ > ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected]
