It's rather unusual; what have you got in the factory that might be
causing it? Can you try powering the LISN from a spur taken directly
from the main breaker box, with nothing else connected to the spur?
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-26 13:33, McBurney, Ian wrote:
Hello John.
I’m getting the LISN checked at a UKAS EMC facility next week. I think
it’s excessive noise on the ac mains that’s not being attenuated
sufficiently by the LISN.
Regards;
Ian
*From:*John Woodgate [mailto:j...@woodjohn.uk]
*Sent:* 26 April 2018 13:04
*To:* McBurney, Ian <ian.mcbur...@allen-heath.com>;
EMC-PSTC@LISTSERV.IEEE.ORG
*Subject:* Re: [PSES] Mains Conducted rf emissions measurements
You might ask the manufacturer of the LISN. Maybe it's faulty.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associateswww.woodjohn.uk <http://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: ian.mcbur...@allen-heath.com <mailto:ian.mcbur...@allen-heath.com>
Allen & Heath Ltd is a registered business in England and Wales,
Company number: 4163451. Any views expressed in this email are
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