Hi Ian,
Could you turn the LISN around to measure the noise on the feed for your chamber? Might give you some useful pointers. All the best James From: McBurney, Ian <[email protected]> Sent: 26 April 2018 15:43 To: [email protected] Subject: Re: [PSES] Mains Conducted rf emissions measurements Hello John. That will be quite difficult as the screened room is in the centre of the building with many different types of equipment adding to the overall mains noise. Regards; Ian McBurney Lead Compliance Engineer. Allen & Heath Ltd. Kernick Industrial Estate, Penryn, Cornwall. TR10 9LU. UK T: 01326 372070 E: [email protected] <mailto:[email protected]> From: John Allen [mailto:[email protected]] Sent: 26 April 2018 13:43 To: McBurney, Ian <[email protected] <mailto:[email protected]> >; [email protected] <mailto:[email protected]> Subject: RE: [PSES] Mains Conducted rf emissions measurements Have you tried to isolate the original source of the noise - and then to supress that? John E Allen W. London, UK From: McBurney, Ian [mailto:[email protected]] Sent: 26 April 2018 11:33 To: [email protected] <mailto:[email protected]> Subject: [PSES] Mains Conducted rf emissions measurements Dear Colleagues. I am setting up a mains conducted rf emissions measuring system and am experiencing excessive mains noise when connecting the LISN to the 240V wall socket. The noise affects my measurements between 150kHz to 400KHz. Beyond that and up to 30MHz I am satisfied. Is there a way of filtering out this noise. I have tried various EMI mains filter modules but none appear to attenuate enough at that frequency band. They are very good at attenuating frequencies beyond 1MHz. I have tried inserting an isolation transformer before the LISN but this appears to distort the measurements. Can anyone recommend a solution? Many thanks in advance. Ian McBurney Lead Compliance Engineer. Allen & Heath Ltd. Kernick Industrial Estate, Penryn, Cornwall. TR10 9LU. UK T: 01326 372070 E: [email protected] <mailto:[email protected]> Allen & Heath Ltd is a registered business in England and Wales, Company number: 4163451. Any views expressed in this email are those of the individual and not necessarily those of the company. - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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Any views expressed in this email are those of the individual and not necessarily those of the company. - ---------------------------------------------------------------- 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] <mailto:[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) <http://www.ieee-pses.org/list.html> List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected] <mailto:[email protected]> > Mike Cantwell <[email protected] <mailto:[email protected]> > For policy questions, send mail to: Jim Bacher <[email protected] <mailto:[email protected]> > David Heald <[email protected] <mailto:[email protected]> > - ---------------------------------------------------------------- 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.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]>
