ANSI C63.4-2003
(Revision of ANSI C63.4-2001)
IEEE
Standards
C63.4
American National Standard for
Methods of Measurement of Radio-
Noise Emissions from Low-Voltage
Electrical and Electronic Equipment
in the Range of 9 kHz to 40 GHz
Accredited by the American National Standards Institute
Sponsored by the
Accredited Standards Committee on Electromagnetic Compatibility, C63
Published by
The Institute of Electrical and Electronics Engineers, Inc.
3 Park Avenue, New York, NY 10016-5997, USA
30 January 2004
Print: SH95184
PDF: SS95184
ANSI C63.4-2003
(Revision of
ANSI C63.4-2001)
American National Standard for
Methods of Measurement of Radio-
Noise Emissions from Low-Voltage
Electrical and Electronic Equipment
in the Range of 9 kHz to 40 GHz
Accredited Standards Committee on Electromagnetic Compatibility, C63
accredited by the
American National Standards Institute
Secretariat
Institute of Electrical and Electronics Engineers, Inc.
Approved 11 December 2003 by the
American National Standards Institute
Abstract:
U.S. consensus standard methods, instrumentation, and facilities for measurement of
radio-frequency (RF) signals and noise emitted from electrical and electronic devices in the
frequency range 9 kHz to 40 GHz are specified. This standard does not include generic nor product-
specific emission limits. Where possible, the specifications herein are harmonized with other
national and international standards used for similar purposes.
Keywords:
conducted emission testing, conducting ground plane, digital equipment, electric field
measurement, line impedance stabilization network, low-voltage electrical equipment, low-voltage
electronic equipment, magnetic field measurement, normalized site attenuation, radiated emission
testing, radio-noise emissions, radio-noise power, site attenuation, unintentional radiators
The Institute of Electrical and Electronics Engineers, Inc.
3 Park Avenue, New York, NY 10016-5997, USA
Copyright © 2004 by the Institute of Electrical and Electronics Engineers, Inc.
All rights reserved. Published 30 January 2004. Printed in the United States of America.
Print:
PDF:
ISBN 0-7381-3843-6
ISBN 0-7381-3844-4
SH95184
SS95184
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written permission of the publisher.
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Introduction
(This introduction is not a part of ANSI C63.4-2003, American National Standard for Methods of Measurement of
Radio-Noise Emissions from Low-Voltage Electrical and Electronic Equipment in the Range of 9 kHz to 40 GHz.)
Almost from the beginning of radio broadcasting, the electric utility companies were faced with the problem
of radio noise. In 1924, the National Electric Light Association appointed a committee to study the subject.
The manufacturers of electric power equipment had encountered similar problems, and in 1930, a
subcommittee of the NEMA Codes and Standards Committee was established. The following year, the EEI-
NEMA-RMA Joint Coordination Committee on Radio Reception was organized.
The Joint Coordination Committee issued a number of reports, among which was Methods of Measuring
Radio Noise, 1940. This report included specifications for a radio-noise and field-strength meter for the
frequency band 0.15 MHz to 18 MHz. The report recommended procedures for measuring radio-noise
voltage (conducted noise) from low- and high-voltage apparatus, making noise field-strength measurements
near overhead powerlines, determining broadcast field strengths, and collecting data upon which to base
tolerable limits for radio noise.
During World War II, the needs of the armed services for instruments and methods for radio-noise
measurement, particularly at frequencies higher than the broadcast band, became pressing, and in 1944,
work on developing suitable specifications was begun by a special subcommittee of ASA Sectional Commit-
tee C63, Radio-Electrical Coordination. This special subcommittee developed a wartime specification that
became Army-Navy Specification JAN-I-225 issued in 1945 and later approved as C63.1-1946, American
War Standard-Method of Measuring Radio Interference of Electrical Components and Completed Assem-
blies of Electrical Equipment for the Armed Forces from 150 kHz to 20 MHz.
In 1951, ASA Sectional Committee C63, through its Subcommittee No. 1 on Techniques and Developments,
started work on improving and extending measurement methods, taking into account methods mentioned in
the 1940 report and those in current military specifications. In the course of this work, Subcommittee No. 1
developed the standard C63.4-1963, Radio-Noise Voltage and Radio-Noise Field Strength, 0.015 to 25 MHz,
Low-Voltage Electric Equipment and Non-Electric Equipment. Work continued within the subcommittee on
developing methods of measurement above 25 MHz and the subsequent inclusion of these measurement
methods in future revisions of C63.4-1963.
C63.4-1963 was reaffirmed in 1969, and work within the subcommittee was accelerated to produce a draft
standard that would make use of the experience gained by several years use of the standard, extend its cover-
age to embrace a broader frequency range, and incorporate newer measurement techniques that had been
developed within the United States and by the International Special Committee on Radio Interference
(CISPR) as set forth in CISPR Publications 14 and 16. The revised standard was published in 1981.
Although many improvements had been made in ANSI C63.4 in the several revisions, the reproducibility of
measurements of radiated interference from one test site to another had not been completely satisfactory. In
1982, a concerted effort was organized in Subcommittee No. 1 of the American National Standards
Committee C63 to determine how the technique could be improved. Evidence showed that the variability
was caused, in part, by inadequate
—
—
—
Control of site reference groundplane conductivity, flatness, site enclosures, effects of surrounding
objects, and certain other site construction features.
Accounting for antenna factors, associated cabling, and balun and device under test characteristics.
Consideration of mutual coupling effects between the device under test and the receiving antenna
and their images in the reference groundplane.
Accordingly, C63.4 was further revised in 1988 and standards ANSI C63.5, ANSI C63.6, and ANSI C63.7
were prepared to provide additional information.
Copyright © 2004 IEEE. All rights reserved.
iii
In late 1988 and in 1989, the importance of including additional details on test procedures to provide proper
evaluation of complex systems, such as information technology equipment and systems, was recognized.
Measurements on such systems can be sensitive to the exact arrangement of equipment units and
interconnecting cables. The 1991 edition was the result of a major effort on the part of the members of the
Committee and various other participating individuals.
Work on a further revision began during 1991 to provide for the testing of intentional as well as
unintentional radiators. The 1992 document included these changes. In 1994, work began on harmonizing
the document with emerging international standards, clarifying several issues with respect to ac powerline
conducted emission measurements and turntable usage, and standardizing terminology. The use of trans-
verse electromagnetic (TEM) devices for measuring emissions, extension from 10 kHz down to 9 kHz, and
revisions to the clause on the Artificial Hand were also added. Minor changes have been made to the normal-
ized site attenuation tables to correct rounding errors. That work culminated in the 2001 issue.
At the time the 2001 issue was approved, there were several subject areas that were identified that needed to
be considered for the next issue. They include: clarification of what is mandatory and that figures are exam-
ples while text takes precedence; allowing emission measurement instrumentation, such as a spectrum ana-
lyzer, that does not fully meet either CISPR 16 or ANSI C63.2, to be used, but, in case of dispute, allowing
only instrumentation meeting either of these two standards to take precedence; clarification of instrumenta-
tion calibration interval requirements; identifying new test setups when power accessories (power packs) are
either the equipment under test (EUT) or not; allowing use of “loopback” cable connections for large floor
standing equipment to accommodate the arrangement of cables connected to output ports to be connected to
input ports under certain conditions; warning that test facilities not allowing full antenna height search may
not yield sufficient data to predict radiated emissions at a site which meets normalized site attenuation; clar-
ifying EUT setups and minimum ports that need to be populated during personal computer testing; clarifying
test frequencies for intentional radiator measurements; and correcting errors on certain figures, tables, and
appendices. The resolution of these subject areas as well as other clarifications appear in this issue.
The following members of the ASC C63 Committee served as task group leaders on this revision:
H. Stephen Berger,
Chair
Edwin Bronaugh
Jon P. Casamento
Donald N. Heirman
H. Robert Hofmann
Greg Korytkowski
Werner Schaefer
Participants
At the time that this standard was published, the Accredited Standards Committee on Electromagnetic
Compatibility, C63, had the following membership:
Ralph M. Showers,
Chair
Donald N. Heirman,
Vice Chair
Robert Pritchard,
IEEE Secretariat
Organization Represented
American Council of Independent Laboratories (ACIL) . . . . . . . . . . . . . . . . . . . . . . . . . .
.......................................................................
Alliance for Telcom Industry Solutions (ATIS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.......................................................................
American Radio Relay League (ARRL). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.......................................................................
Curtis-Straus LLC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.......................................................................
Dell Inc.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.......................................................................
Name of Representative
Michael F. Violette
William Stumpf
(Alt.)
Chrys Chrysanthou
James Turner
(Alt.)
Dennis Bodson
Edward F. Hare
(Alt.)
Jon Curtis
Jonathan Stewart
(Alt.)
Edwin L. Bronaugh
R. Barry Wallen
(Alt.)
iv
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