Ian,
Altho you haven't identified the source of the noise it
certainly is due to switching equipment upstream from your lab within you
building; VSDs are very noisy at lower frequencies.
I recommend that you look for an electric motor-generator
unit to power your lab. This should be much cleaner than any switching
source.
:>) br, Pete
Peter E Perkins, PE
Principal Product Safety & Regulatory Affairs Consultant
PO Box 23427
Tigard, ORe 97281-3427
503/452-1201
IEEE Life Fellow
<mailto:[email protected]> [email protected]
From: McBurney, Ian <[email protected]>
Sent: Friday, April 27, 2018 1:11 AM
To: [email protected]
Subject: Re: [PSES] Mains Conducted rf emissions measurements
Hello Ari.
I'm considering hiring an ac source to power the LISN but my only concern
would be that the ac source has high conducted rf emissions as I assume the
ac is derived from high frequency switching power devices.
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: Ari Honkala [mailto:[email protected]]
Sent: 26 April 2018 17:22
To: [email protected] <mailto:[email protected]>
Subject: Re: [PSES] Mains Conducted rf emissions measurements
As an interim solution, until you get the source fixed, would be to use UPS
on battery.
with best regards,
Ari Honkala
From: McBurney, Ian [mailto:[email protected]]
Sent: torstai 26. huhtikuuta 2018 13:33
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.
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Attachments are not permitted but the IEEE PSES Online Communities site at
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well-used formats), large files, etc.
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individual and not necessarily those of the company.
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