Hi Ian,
When you used the isolation transformer how did you have the earth connected or
isolated?
I have seen similar issues, I used an isolation transformer but connected the
earth or used a separate earth connection, I think I remember this solved it.
You could try finding the source of the noise,
how certain are you that the LISN is not faulty?
Normally they filter out emissions very well, could it be the LISN is faulty
and passing the noise through or creating the noise it the first place?
Can you run a set up to look at how noisy your mains supply is without any
product connected to it?
regards Darren.
On Friday, 27 April 2018, 9:11, "McBurney, Ian"
<ian.mcbur...@allen-heath.com> wrote:
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div.yiv4618276205WordSection1 {}-->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: ian.mcbur...@allen-heath.com From: Ari Honkala
[mailto:ari.honk...@sesko.fi]
Sent: 26 April 2018 17:22
To: EMC-PSTC@LISTSERV.IEEE.ORG
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:ian.mcbur...@allen-heath.com]
Sent: torstai 26. huhtikuuta 2018 13:33
To: EMC-PSTC@LISTSERV.IEEE.ORG
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: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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