Good Friday morning all, We have a customer who is measuring conducted emissions on the DC output of our external switching power supply (laptop-style power supply), claiming it is required by CISPR 22. As I read through CISPR 22-2005 for rebuttal material, the phrase telecom port was defined and the measurement details looked clear. Until I got to Annex C.
Clause C.1.5 is titled 'Flowchart for selecting test method', and says the flowchart in Figure C.6 is applied to different ports. The flowchart has a decision block at the top based on whether the port is a telecom port. If not, no testing is necessary. If the port is a telecom port, you choose between 4 methods: - Unscreened pairs - Screened or coaxial - Mains - Other Certainly, Mains ports need testing regardless of whether the EUT has telecom ports, so the flowchart has logic errors. But does the port choice 'Other' mean you must test any port not already covered? Can a single statement in a flowchart define testing requirements not detailed elsewhere? BTW, the flowchart says 'Other' ports must meet the telecom test limits. Pat Lawler EMC Engineer SL Power Electronics Corp. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
