Actually, I'm somewhat glad to hear it. It will stop a little debate
with my power supply manufacturers. Every time they are in trouble they hang on
the 120 Vac 450kHz limit. Because the FCC allows you to use the radiated limits
as long as you use the conducted limits below I have specified for some time
that the power supplies must meet these limits at 120 Vac, not just 230 Vac.
Haven't designed power supplies myself, but the vendors I use tell me that it
gets to be a tougher proposition for large current drawing devices trying to
meet those limits at the Lower US voltage. When they can keep the voltage at
230 when testing in the 150kHz range the better they like it.
This would tend to resolve that issue on its own.
Thanks for the update - and I'm pretty sure not every one will agree
with my enthusiasm.
Gary
-----Original Message-----
From: John Barnes [mailto:[email protected]]
Sent: Wednesday, July 24, 2002 8:15 AM
To: [email protected]
Subject: Changes to FCC Conducted Limits for Part 15 & 18
EMC-PSTC'ers,
There has been talk for several months about the FCC changing the
conducted emission limits for Part 15 and Part 18 devices. Well, it is
official. FCC docket 98-80 was published in the Federal Register on
July 10, 2002- volume 67, number 132, pages 45666-45671, see (all one
URL):
http://frwebgate1.access.gpo.gov/
cgi-bin/waisgate.cgi?WAISdocID=38880224794+0+0+0&WAISaction=retrieve
FCC Part 15, incorporating the new Section 15.107, may be downloaded
from
http://www.fcc.gov/oet/info/rules/part15/part15_5_30_02.pdf
This will not be printed in the Code of Federal Regulations (CFR),
downloadable from the National Archives and Records Administration
(NARA) at:
http://www.access.gpo.gov/nara/cfr/cfr-table-search.html
until spring 2003.
This change probably will not affect products that have been marketed in
Taiwan and Japan, because they have already had to meet the CISPR limits
for those markets. But products that are sold only in the US/Canada may
be affected, because conducted emissions are now to be tested clear down
to 150kHz, versus the former 450kHz lower limit.
The new conducted emission limits are:
* Mains port on Class B devices:
- 66dB(uV) quasi-peak and 56dB(uV) average at 0.15MHz, to
56dB(uV) quasi-peak and 46dB(uV) average at 0.50MHz, decreasing
linearly with the logarithm of the frequency.
- 56dB(uV) quasi-peak and 46dB(uV) average from 0.50MHz to 5MHz.
- 60dB(uV) quasi-peak and 50dB(uV) average from 5MHz to 30MHz.
* Mains port on Class A devices:
- 79dB(uV) quasi-peak and 66dB(uV) average from 0.15MHz to 0.50MHz.
- 73dB(uV) quasi-peak and 60dB(uV) average from 0.50MHz to 30MHz.
Paragraph 15 of FCC Docket 98-80, Transition Provisions, says that FCC
part 15/18 products may be authorized using the old or the new FCC
limits for two years (until July 10, 2004). After July 10, 2004, FCC
part 15/18 products must be authorized using the new FCC limits.
Furthermore, the new limits will apply to all FCC part 15/18 products
that are manufactured or imported after three years (after July 10,
2005).
So for the next two or three years you have a third option for meeting
FCC Part 15/18 requirements:
1. Meet the old FCC conducted-emission and radiated-emission limits.
2. Meet CISPR conducted-emission and radiated-emission limits.
3. Meet CISPR conducted-emission limits and the old FCC radiated-
emission limits.
John Barnes
dBi Corporation
http://www.dbicorporation.com/
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This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.
Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/
To cancel your subscription, send mail to:
[email protected]
with the single line:
unsubscribe emc-pstc
For help, send mail to the list administrators:
Ron Pickard: [email protected]
Dave Heald: [email protected]
For policy questions, send mail to:
Richard Nute: [email protected]
Jim Bacher: [email protected]
All emc-pstc postings are archived and searchable on the web at:
http://ieeepstc.mindcruiser.com/
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