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IEEE OKAYS REVISED STANDARD FOR MEASURING EMISSIONS FROM FM AND TV
BROADCAST RECEIVERS
Contact:
Dave Traver, Chair of the P187(TM) Working Group
+1 619-665-1585, davidtraver@cts.com
or
Karen
McCabe, IEEE Marketing Manager
+1 732 562-3824, k.mccabe@ieee.org
For Release:
Immediate
PISCATAWAY, N.J., USA, 26 January 2004 The IEEE standard
used to evaluate emissions from FM and TV receivers has just gotten
a long-awaited overhaul. The revised standard, IEEE 187™,
which was last updated in 1990, now accounts for the prevalence
of digital operation, the larger size of today's TVs, and the
widespread use of cable and other signal inputs and outputs.
All TV sets
sold in the US are tested under IEEE 187, "Standard
Measurement Methods of Emissions from FM and Television Broadcast
Receivers in the Frequency Range of 9kHz to 40GH," which
covers the potential sources of spurious radiation from these
receivers and how to measure them.
The revised
version of this standard encompasses both radiated and conductive
emission testing to ensure receivers do not interfere with cell
phones, computers and other digital devices. (Conductive emissions
had been covered in IEEE 213™, which has been incorporated
into the updated standard.)
"The standard
now goes far beyond the antenna inputs of the prior
version," says Dave Traver, Chair of the P187 Working Group.
"It
accommodates today's free-standing units and new configurations,
such as rear projection TVs. It also accounts for the near-universal
presence of digital operation in video inputs of all kinds and
even the use of Firewire and modems.
"We made
the standard highly flexible because we could not possibly account
for the many ways TVs are now and will be used. Manufacturers
can test their units according to how their units will most likely
be configured by the consumer. This includes the addition of systems
for playing games, enhanced sound, viewing DVDs and other peripherals.
Under the standard, manufacturers typically test at least one
of each type of input or output."
The updated
standard includes a number of new tests. For example, it adds
direct cable input testing, which can be completed in about one
hour versus the much longer evaluation of RF antennae in the prior
standard. It also adds testing for digital ATSC receivers (high-definition
digital tuners) or combination receivers while retaining analog
NTSC testing.
IEEE 187 is
specified for TV and FM receiver emission testing under
ANSI C63.4, which is required for TV broadcast receiver tests
under FCC Part 15. The initial version of IEEE 187 dates back
to 1951, early in the early days of commercial broadcasting.
This standard was sponsored by the IEEE Electromagnetic Compatibility
Society.
About the
IEEE Standards Association
The IEEE Standards Association, a globally recognized standards-setting
body, develops consensus standards through an open process that
brings diverse parts of an industry together. These standards
set specifications and procedures based on current scientific
consensus. The IEEE-SA has a portfolio of more than 870 completed
standards and more than 400 standards in development. Over 15,000
IEEE members worldwide belong to IEEE-SA and voluntarily participate
in standards activities. For further information on IEEE-SA see:
http://standards.ieee.org/.
About the IEEE
The IEEE has more than 380,000 members in approximately 150 countries.
Through its members, the organization is a leading authority on
areas ranging from aerospace, computers and telecommunications
to biomedicine, electric power and consumer electronics. The IEEE
produces nearly 30 percent of the world's literature in the electrical
and electronics engineering, computing and control technology
fields. This nonprofit organization also sponsors or cosponsors
more than 300 technical conferences each year. Additional information
about the IEEE can be found at http://www.ieee.org/portal/index.jsp
IEEE
187 and IEEE 213 are trademarks of the IEEE. All other names or
product names are the trademarks, service marks or registered
trademarks of their respective holders.
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