You might ask the manufacturer of the LISN. Maybe it's faulty.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-26 11:32, McBurney, Ian wrote:
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]
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. 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)
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]>
