Section 7.3 is taking care of the lower impedance in the following manner:
The current shall be monitored not to exceed Uo/150 If this limit is reached reduce the Uo to keep the current at this limit. (3V/150 = 20 mA) Regards Lothar Schmidt BQB & Technical Manager EMC/Radio/SAR CETECOM Inc. 411 Dixon Landing Road Milpitas, CA 95035 ' +1 408 586 6214 7 +1 408 586 6299 This e-mail transmission, and any documents, files, or previous e-mail messages attached to it may contain information that is confidential or legally privileged. If you are not the intended recipient, or a person responsible for delivering it to the intended recipient, you are hereby notified that you must not read this transmission and that any disclosure, copying, printing, distribution, or use of any of the information contained in or attached to this transmission is strictly prohibited. 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From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Friday, January 23, 2004 9:46 AM To: [email protected] Subject: RE: Clamp Injection EN61000-4-3 Question Well, if you can maintain the 150 ohm to AE, your current cannot exceed Uo/150, right? > -----Original Message----- > From: [email protected] > [mailto:[email protected]]On Behalf Of ext > [email protected] > Sent: 23 January, 2004 19:08 > To: [email protected] > Subject: RE: Clamp Injection EN61000-4-3 Question > > > > My product is a relatively large, 19"-rack mounted device. > And I made a (kind of obvious) mistake, it is -6 (conducted > immunity) and not -3. > > The chassis is supposed to be bonded to Safety Ground. > 6.2.2.1 provides requirement to connect the EUT chassis to ground > reference plane through CDN-M1 (to increase the CM impedance). > > 150 Ohm (plus/minus tolerancefrom chassis to GND is a moot point at > the higher end of the tested frequency range, due to the impedance of > the chassis and the attached cables vs. > environment, that is in parallel to the CDN. > > Let me rephrase my original question: > > Am I allowed to measure current and stop the test if the current into > EUT exceeds Uo/150, even if I can meet the formas requirements on the > EUT and AE setup/impedances? > > Thanks, Neven > > > > You're right, not always (i.e. with safety class II). > > But if there's earth terminal a M-1 is connected to it, see 6.2.1.1 > > of 2nd Ed. > > Ari > > > > > -----Original Message----- > > > From: [email protected] > > > [mailto:[email protected]]On Behalf Of > ext Oliver Betz > > > Sent: 23 January, 2004 11:49 > > > To: [email protected] > > > Subject: RE: Clamp Injection EN61000-4-3 Question > > > > > > > > > > > > <[email protected]> wrote: > > > > > > [EN61000-4-6] > > > > > > > Some comments to Neven: > > > > -When you use BCI clamp you can measure and limit the > > > current as you describe. > > > > -The impedance is not >150 ohms but with +/- tolerance, > see Table 3. > > > > -The EUT needs to have 150 ohms from chassis to earth so > > > the impedance is not as low as you say > > > > > > Really "_chassis_ to earth" - where do you read this? > > > > > > Oliver > > > -- > > > Oliver Betz, Muenchen > > > > > > > > > ------------------------------------------- > > > This message is from the IEEE EMC Society Product Safety > > > > Technical Committee emc-pstc discussion list. > > > > > > Visit our web site at: http://www.ieee-pses.org/ > > > > > > 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://www.ieeecommunities.org/emc-pstc > > > > > > > > > ------------------------------------------- > > This message is from the IEEE EMC Society Product Safety Technical > > Committee emc-pstc discussion list. > > > > Visit our web site at: http://www.ieee-pses.org/ > > > > 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://www.ieeecommunities.org/emc-pstc > > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety Technical > Committee emc-pstc discussion list. > > Visit our web site at: http://www.ieee-pses.org/ > > 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://www.ieeecommunities.org/emc-pstc > This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ieee-pses.org/ 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://www.ieeecommunities.org/emc-pstc This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ieee-pses.org/ 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://www.ieeecommunities.org/emc-pstc
