In a message dated 7/2/2003 11:23:03 PM Central Daylight Time,
j...@jmwa.demon.co.uk writes:
Where did you get the idea that 'CE stops at 30 MHz'? The test for
*conducted emissions on the mains lead* goes up to 30 MHz. Emissions at
higher frequencies are controlled by the requirements for
I read in !emc-pstc that lfresea...@aol.com wrote (in 136.21721a07.2c34
9...@aol.com) about 'Source of noise' on Wed, 2 Jul 2003:
In messing around, at about 40 MHz, the PC noise is showing up on
the power cord. I guess noone worries because CE stops at 30 MHz.
Where did you get
Morning folks..
I find myself wrestling with PC emissions again. No names this time :-)
Above 500 MHz, I'm seeing a bunch of reasonably stable harmonics with about a
33 MHz spacing. Any thoughts as to what they may be from?
I've played with all the case openings etc, and also added a ferrite
to control the firmware is very helpful.
Hope this helps and good luck.
RICK LINFORD
rlinf...@sonicwall.com
From: lfresea...@aol.com [mailto:lfresea...@aol.com]
Sent: Wednesday, July 02, 2003 10:39 AM
To: emc-p...@ieee.org
Subject: Source of noise
Morning folks..
I find myself
In a message dated 7/2/2003 3:03:29 PM Central Daylight Time,
bstu...@dlsemc.com writes:
Derek,
All power supplies are supposed to be tested with a representative system.
They are primarily designed to filter the supply emissions, since line filters
typically do little filtering above 20 or 25
Electronics
166 South Carter St.
Genoa City WI 53128
ph: 262-279-0210
fx: 262-279-3630
email: bstu...@dlsemc.com
From: lfresea...@aol.com [mailto:lfresea...@aol.com]
Sent: Wednesday, July 02, 2003 2:16 PM
To: emc-p...@ieee.org
Subject: Re: Source of noise
Hi All,
Thanks for the great
Derek,
Most of the PS manufacturers I've dealt with use passive
dummy loads or quiet active loads. These very handy
quiet active loads provide programmable loading, BUT IN NO
WAY SIMULATE THE SUPPLY'S ACTUAL USE. In other words, how
many quiet loads do you power? Almost every load is a
micro
Hi All,
Thanks for the great replies!
looks like the PCI bus is the problem.. But here's the quandry..
Now we are adding the cards back in, they should add little to the profile,
correct? After all, they all have the CE mark on them, and some have the FCC
sticker too.
This is not happening,
://www.ncr.com
17095 Via del Campo
San Diego, CA 92127
tel: 858-485-2537
fax: 858-485-3788
From: lfresea...@aol.com [mailto:lfresea...@aol.com]
Sent: Wednesday, July 02, 2003 9:39 AM
To: emc-p...@ieee.org
Subject: Source of noise
Morning folks..
I find myself wrestling with PC emissions again
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