I meant to limit the current of course. Are you saying I can limit the current into EUT if it exceeds Uo/150 even though the AE impedance meets the requirement of the standard?
To me that makes a lots of sense. Formally it seems to me that it would contradict the standard thouogh, because the provision is only decribed in section that describes the situation in which the AE impedance requirement cannot be met. Neven > > Ari, > Only at low frequencies. For large equipment at the higher end of the -6 > frequency range, it is possible for the impedance seen by the injection > device to drop below 150 ohms, even if the AE is properly decoupled. > > Neven, > You're allowed to limit the current to Uo/150, not stop the test. > > Brent DeWitt > -----Original Message----- > From: [email protected] > [mailto:[email protected]]On Behalf Of > [email protected] > Sent: Friday, January 23, 2004 10:46 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 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
