John >If you have a universal (switching) power supply, the FCC will let you use 230V 50Hz >Conducted Emissions data to support a United States Declaration of Conformity (DoC).
They won't - please see KDB 873782 ________________________________________ Question: When measuring radiated and conducted emissions from a device subject to Part 15, do US voltages (120 VAC vs. 240 VAC) and frequencies (60 Hz vs. 50 Hz) have to be used during the tests, or can the CISPR 22 test procedures be used? ________________________________________ Answer: The procedures for testing radiated and AC line conducted emissions from intentional and unintentional radiators are contained in 47 CFR 15.31(a)(3), which incorporates ANSI C63.4-2003 by reference. C63.4-2003 specifies the use of US voltages and frequencies when making radiated and AC line conducted emission measurements. The Equipment Under Test (EUT) must therefore be tested for the US market using US voltages and frequencies. > The European Union (EU) *will not* let you use 120V 60Hz Conducted Emissions data to support an EU DoC I think a citation is required. To clarify - my answer was in response to a question regarding the testing of a lower power 5V device that connects to a mains SMPS. Regards Charlie -----Original Message----- From: John Barnes [mailto:[email protected]] Sent: 06 May 2011 14:42 To: Charlie Blackham Cc: 'Gartman, Richard'; [email protected] Subject: Re: [PSES] Opinion regarding USB and EMC testing Charlie, > Another option is that you might choose to use you FCC part 15 mains > conducted emissions measurements to support you EU DoC, rather than > repeat the test at 230V, for example. If you have a universal (switching) power supply, the FCC will let you use 230V 50Hz Conducted Emissions data to support a United States Declaration of Conformity (DoC). The European Union (EU) *will not* let you use 120V 60Hz Conducted Emissions data to support an EU DoC. However, I have seen a number of cases where switching power supplies have had *significantly* different Conducted Emissions between 120V 60Hz and 230V 50Hz input power. Therefore I always test them with both supply voltages/frequencies. John Barnes KS4GL, PE, NCE, NCT, ESDC Eng, ESDC Tech, PSE, SM IEEE dBi Corporation http://www.dbicorporation.com/ - ---------------------------------------------------------------- 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://product-compliance.oc.ieee.org/ 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]>
