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1994-11-27
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Subject: EMC STANDARDS Rev.: July 28, 1993
File: \public\info\tis\emcstds.txt
This information package was prepared as a membership service by the
American Radio Relay League, Inc., Technical Information Service, 225
Main St., Newington, CT 06111 (203) 666-1541. Email: tis@arrl.org
(Internet).
From the files of the ARRL Automated Electronic Mail Server,
(info@arrl.org):
Thank you for requesting the following information from the ARRL
Technical Information Service or the ARRL Automated Mail Server
(info@arrl.org). ARRL HQ is glad to provide this information free
of charge as a service to League members and affiliated clubs.
For your convenience, you may reproduce this information,
electronically or on paper, and distribute it to anyone who needs
it, provided that you reproduce it in its entirety and do so free
of charge.
If you have any questions concerning the reproduction or distribution of
this material, please contact Michael Tracy, KC1SX, Technical
Information Service Coordinator, American Radio Relay League, 225 Main
St., Newington, CT 06111 (email: mtracy@arrl.org).
The American National Standards Institute (ANSI) is a non-
profit organization which is the overall standards body in the
United States. At one time, it actually developed standards.
Today, however, it is an umbrella for the standards-setting
organizations.
One of the ANSI standards committees is ANSI C63, which deals
with EMC and which is really a committee of the Institute of
Electrical and Electronics Engineers (IEEE). The ARRL is an active
voting participant in its meetings dealing with immunity of
receivers (particularly TV and VCR) and limits on unintentional
emitters.
Electronics Industry Association (EIA) used to cover all
aspects of electronics from the component to system levels.
Several years ago, however, Telecommunications Industry Association
(TIA) was formed out of it to deal with system level standards. As
examples: EIA is responsible for the RS-232 interface (now known
as EIA-232-D, the RS being dropped) and TIA is responsible for
cellular radio standards. EIA's primary contribution to EMC
standards is to represent the electronics manufacturers to the ANSI
C63 committee.
Historically, the Federal Communications Commission (FCC)
claimed they had no authority to regulate receiver specifications.
The ARRL proposed legislation, known informally as the Goldwater
Bill and became Public Law 97-259, which gave the Commission
authority to regulate receivers. They chose not to do it directly
but preferred to let ANSI C63 do it voluntarily. Some progress has
been made in raising receiver RF-immunity levels, but we would have
preferred higher levels. There has been some improvement in
immunity levels for TV and VCR receivers, although the greater
contribution to reducing EMI has been the result of the use of
cable rather than on-air TV reception. FCC and ARRL booklets and
handouts on EMI have contributed to solution of specific EMI cases.
Regulation of radio in the U.S. is split between the FCC for
non-federal-government and NTIA for federal government. NTIA has
no quarrel with receiver regulation and maintains standards for
federal government receivers. The FCC's more laissez-faire
approach to receiver regulation seems to prevail in U.S. positions
at CISPR, however.
ANSI has a Technical advisory groups (TAGs) for each IEC
(including CISPR) committee in which the U.S. participates. U.S.
positions in CISPR are formulated through the private sector under
ANSI which includes representatives of the FCC and NTIA.
According to the latest IEEE standards catalog I have (1993),
IEEE has the following EMC standards of possible interest:
139-1988 IEEE Recommended Practice for the Measurement of Radio
Frequency Emission from Industrial, Scientific, and Medical (ISM)
Equipment Installed on User's Premises
187-1990 IEEE Standard on Radio Receivers: Open Field Method of
Measurement of Spurious Radiation from FM and Television Broadcast
Receivers
213-1987 IEEE Standard procedure for Measuring Conducted Emissions
in the Range of 300 kHz to 25 MHz from Television and FM Broadcast
Receivers to Power Lines
377-1980 IEEE Recommended Practice for Measurement of Spurious
Emission from Land-Mobile Communications Transmitters
475-1983 IEEE Measurement Procedure for Field Disturbance Sensor
(rf Intrusion Alarm)
C63.2-1987 Electromagnetic Noise and Field Strength, 10 kHz to 40
GHz Specifications
ANSI/C63.4-1991 Methods of Measurement of Radio-Noise Emissions
from Low-Voltage Electrical and Electronic Equipment in the Range
of 9 kHz to 40 GHz
ANSI/C63.4-1992 Standard Methods of Measurement of Radio-Noise
Emissions from Low-Voltage Electrical and Electronics Equipment in
the Range of 9 kHz to 40 GHz
ANSI/C63.5-1988 Calibration of Antennas Used for Radiated Emission
Measurements in Electromagnetic Interference (EMI) Control
ANSI/C63.7-1988 Guide for Construction of Open Area Test Sites for
performing Radiated Emission Measurements
ANSI/C63.12-1987 Recommended Practice for Electromagnetic
Compatibility Limits
According to the EIA/TIA standards catalog, the following EMC
standard is in effect:
ANSI/EIA-544 Immunity of TV and VCR Tuners to Internally Generated
Harmonic Interference from Signals
I don't have any information on EMC characteristics of HDTV
receivers that may result from the FCC's advanced television
standards committee. The committee has given some attention to
interference between the several proposed HDTV systems and existing
NTSC systems. The fact that each system had a different
interference profile vis-a-vis NTSC set the committee's work back
about six months. Where they stand now is that the FCC didn't like
any particular one of the proposed HDTV systems but liked parts of
each. They told industry to get together and agree on a merged
standard with the characteristics the FCC liked. This new standard
hasn't been built or tested yet. While there are technical
problems, they are minuscule compared to the potential legal
problems of who owns what intellectual properties making up the new
standard. It is premature to request information about the EMC
profile of the new standard until a little later in the process--
maybe late 1993.