It can be argued that AM would be as good as Pulse for finding susceptibility, but when using -4-3 methods you’re talking about nearly double the peak level – 30 V/m versus 54 V/m. That means a hell of a lot of amplifier power, especially if you want to do a 4 point uniform field. I think pulse makes much more sense. It is much closer to the actual threats out there, and other standards are already using it. IEC 60601-1-2:2014 has it in Table 9. ISO 13766 and UN ECE R10.05 also have it for 800-2000 MHz susceptibility. Annex A of -4-3 addresses the use of other modulations, but to me it reads like they decided AM was the best, then wrote the annex to support that conclusion.
Rob – whichever modulation they choose is going to require retesting. AM or Pulse, no one was previously doing spot checks at the freq. required in CISPR 35. Thanks, David From: John Woodgate [mailto:[email protected]] Sent: Monday, May 23, 2016 2:57 AM To: [email protected] Subject: Re: [PSES] EN 55035 / CISPR 35 There was a huge argument when the GHz tests were first introduced over whether the use of pulse modulation was justified. It seems that any differences from sine modulation are not large enough to matter, at least in some opinions. From: Robert Dunkerley [mailto:[email protected]] Sent: Monday, May 23, 2016 8:08 AM To: [email protected]<mailto:[email protected]> Subject: Re: [PSES] EN 55035 / CISPR 35 Hi David, I would have thought they would keep it at the 80% 1kHz AM modulation, so potentially 30V/m CW calibration, then apply the modulation on the test run, to give 54V/m peaks? But as you said, pulse might make more sense as it replicates mobile phone/wifi devices better maybe. This would open up a lot of re-testing on products that comply with the current standards. Rob. From: Schaefer, David [mailto:[email protected]] Sent: 20 May 2016 16:45 To: [email protected]<mailto:[email protected]> Subject: Re: [PSES] EN 55035 / CISPR 35 There’s a separate question on CISPR 35 I would like answered – are they going to use pulse modulation for the spot frequencies? As Rob mentioned, the requirement could be up to 30 V/m. If you’re intended to use the normal AM modulation of IEC 61000-4-3, that’s up to 54 V/m during your calibration. Pulse modulation makes more sense, but it isn’t in the draft. David From: Robert Dunkerley [mailto:[email protected]] Sent: Friday, May 20, 2016 7:23 AM To: [email protected]<mailto:[email protected]> Subject: Re: [PSES] EN 55035 / CISPR 35 Hi John, So EN 55035 (CISPR 35) may not filter through to the OJ Harmonised list until end of 2019? Up until that point, it will be a combination of EN 55032 and either EN 55024, 55020 or 55103-2? Thanks, Regards Rob. From: John Woodgate [mailto:[email protected]] Sent: 19 May 2016 13:16 To: Robert Dunkerley; [email protected]<mailto:[email protected]> Subject: RE: [PSES] EN 55035 / CISPR 35 It is most unlikely that 55035 will be brought into mandatory effect without at least 3 years transition. It appears that the CISPR FDIS is forecast for October 2016, and CENELEC will for sure need time to process it into an EN. With best wishes DESIGN IT IN! OOO – Own Opinions Only www.jmwa.demon.co.uk<http://www.jmwa.demon.co.uk/> J M Woodgate and Associates Rayleigh England From: Robert Dunkerley [mailto:[email protected]] Sent: Thursday, May 19, 2016 12:45 PM To: [email protected]<mailto:[email protected]> Subject: [PSES] EN 55035 / CISPR 35 Hi, I’m trying to plan ahead for the new EMC Standards coming in next year, in particular EN 55032 and EN 55035. With EN 55035 still in draft form, are we likely to see that become compulsory the same time EN 55032 does? (ie 5th March 2017?) In addition, do we know what the Radiated Immunity test changes are likely to be on the final version of the draft? I’ve seen that there is a new requirement for spot frequencies at 1.8GHz, 2.6GHz, 3.5GHz and 5GHz @ 3V/m. However, I have also seen talk of a ‘Protection Distance’ which could increase this 3V/m up to 30V/m. Best regards, Rob. ________________________________ This email has been scanned for email related threats and delivered safely by Mimecast. For more information please visit http://www.mimecast.com ________________________________ - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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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.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) 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]>
