If so, have you got a bigelectronic motor drive (VSD?) nearby? They
/should/ be assessed, at leas for conducted emissions, after
installation, but....
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-26 15:24, McBurney, Ian wrote:
Hello Brian.
Yes, I have 2 bulkhead mounted filters; one for the screened room &
one for the control room.
However; I think the fundamental frequency of the noise may be in the
KHz or 10s of KHz range.
Regards;
Ian
*From:*Kunde, Brian [mailto:brian_ku...@lecotc.com]
*Sent:* 26 April 2018 14:12
*To:* McBurney, Ian <ian.mcbur...@allen-heath.com>;
EMC-PSTC@LISTSERV.IEEE.ORG
*Subject:* RE: Mains Conducted rf emissions measurements
Ian,
Does your screen room have massive line filters on the AC mains coming
in? This would be a requirement I believe.
Brian
*From:*McBurney, Ian [mailto:ian.mcbur...@allen-heath.com]
*Sent:* Thursday, April 26, 2018 9:08 AM
*To:* Kunde, Brian; EMC-PSTC@LISTSERV.IEEE.ORG
<mailto:EMC-PSTC@LISTSERV.IEEE.ORG>
*Subject:* RE: Mains Conducted rf emissions measurements
Hello Brian.
If I power the LISN from the wall socket with no load connected, the
emissions measurements are high.
If I switch off the wall socket, (double pole switch) but leave the
LISN supply cable plugged in the wall socket the emissions drop
considerably.
It is unfortunate that the measurement chamber is within a busy air
conditioned R&D building but it is a screened room.
Regards;
Ian
*From:*Kunde, Brian [mailto:brian_ku...@lecotc.com]
*Sent:* 26 April 2018 13:38
*To:* EMC-PSTC@LISTSERV.IEEE.ORG <mailto:EMC-PSTC@LISTSERV.IEEE.ORG>
*Subject:* Re: [PSES] Mains Conducted rf emissions measurements
Ian,
First, are you sure the noise if coming from your AC Mains? If you
are using line filters, you need to get some kick butt filters that
will give you good attenuation down to at least 10khz.
Second, are you sure the signals you are seeing between 150kHz and
400kHz are real? Zero in on one of the signals and do a linearity
check. This is done by taking a reading, then add attenuation such as
a 6 dB attenuator to the input, and take another reading, which should
be 6 dB less. If not, the problem might be a signal much lower in
frequency which is throwing off the input stage of your
receiver/spectrum analyzer.
Check the AC Mains powering your analyzer. It might be the source of
your problem.
Hope you figure it out.
The Other Brian
*From:*McBurney, Ian [mailto:ian.mcbur...@allen-heath.com]
*Sent:* Thursday, April 26, 2018 6:33 AM
*To:* EMC-PSTC@LISTSERV.IEEE.ORG <mailto:EMC-PSTC@LISTSERV.IEEE.ORG>
*Subject:* [BULK] [PSES] Mains Conducted rf emissions measurements
*Importance:* Low
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 those
of the individual and not necessarily those of the company.
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