Agreed... The requirements vary from one agency to the next.
Suggest examining CIG 022 and CIG 023 forms...they cover a lot of ground
common to most certifiers. Might also contact the NRTL in request of
copy of their audit form to ensure all bases are addressed. NRTL's are
usually pretty good
Most NRTLs will provide an audit "checklist" upon request.
I can think of several immediate sources. The basic mfr's requirements can be
found in the Section General of your UL FUS reports, CSA Design Guide for that
standard, or perhaps an agency's IEC 17025 audit form (but the latter would be
m
Hello all,
Can anyone share a written checklist for use by a newbie in the compliance
business (not me :-), faced with their first interaction with a NRTL's IPI
(Initial Production Inspection).
I've been thru it a number of times over the years myself, but have never
see a written procedure. Thei
Ian,
the question you posted is so generic that nobody can really answer it. It
does not give any clue regarding the sources and mechanisms of emission, no
results of your troubleshooting, nor does it give any insight into the product
and possible causes of the increased emission. If you provid
Ian,
The problem is probably a common-mode signal from some other source using the
Ethernet cable as an antenna, as Ken Javor has suggested. The 20dB failure is
strong evidence of that because an Ethernet signal based failure would not be
that strong. Besides, 33 MHz is not a clock frequency
33MHz - sounds like PCI bus. The radiation originating from Ethernet is very
broadband per se as the data is scrambled using
a pseudo-random code, thus widening the spectrum. This was intended to reduce
EMI.
There are several things to think of:
- The traces between the magnetics and the connector
Ian,
PCB layout is very critical; especially in the I/O area (around the RJ-45
connectors). Make sure that the Ethernet transformer you use has good
common-mode filtering built in. You might also try using "Bob Smith
termination" on the un-used pins of the I/O connector. If you've never heard
of
No experience with Ethernet per se, so this is a very general comment. It
sounds as if the emissions are common mode. If so, they may not have anything
to do with the Ethernet itself, the Ethernet may be a fortuitous conductor. I
would check this using a current probe around the cable, with and
Dear colleagues;
Can anyone advise me how to reduce the radiated emissions from a 100 base-T
Ethernet port with a UTP cable connected to below the EN55022 class B limit?
At the moment I am 20dB above the limit at 33MHz. Using STP only reduces the
emissions by 6dB.
Thanks in advance;
Ian McBurne
In Europe RFID are subject to the provision of R&TTE directive that cover:
EMC, Safety, Radio.
For EMC you have to apply EN 301 489-1 and EN 301 489-3
For safety EN 60950-1 coul be used
and for radio look on the list of the standards at
http://europa.eu.int/comm/enterprise/ne
approach/standardizati
Yes, I have tried that with a little degree of success because the
orientation of the EUT.
Getting a view with enough contrast from the back-lit LCD panel is always a
real challenge.
At present spotting a momentary "transient" event like a flicker on the LCD
display panel is almost an impossibility
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