IEEE-270-2006.pdf
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1、IEEE Std 270-2006 (Revision of IEEE Std 270-1966) IEEE Standard Definitions for Selected Quantities, Units, and Related Terms, with Special Attention to the International System of Units (SI) I E E E 3 Park Avenue New York, NY 10016-5997, USA 29 September 2006 IEEE Standards Coordinating Committee 1
2、4 Sponsored by the Standards Coordinating Committee on Quantities, Units, and Letter Symbols (SCC14) Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 02:46:46 MDTNo r
3、eproduction or networking permitted without license from IHS -,-,- Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 02:46:46 MDTNo reproduction or networking permitte
4、d without license from IHS -,-,- Recognized as an IEEE Std 270-2006 American National Standard (ANSI) (Revision of IEEE Std 270-1966) IEEE Standard Definitions for Selected Quantities, Units, and Related Terms, with Special Attention to the International System of Units (SI) Sponsor Quantities, Unit
5、s, and Letter Symbols Committee of the Standards Coordinating Committee 14 (SCC14) Approved 6 September 2006 American National Standards Institute Approved 30 March 2006 IEEE-SA Standards Board Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with I
6、EEELicensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 02:46:46 MDTNo reproduction or networking permitted without license from IHS -,-,- Abstract: The definitions for physical quantities and units commonly used in applied science and technology, and for related terms that conc
7、ern systems of measurement, are included in this standard. Particular emphasis is placed on the International System of Units (Le Systme International dUnits, SI). Keywords: International System of Units, measurement, metric, quantities, SI, units _ The Institute of Electrical and Electronics Engine
8、ers, Inc. 3 Park Avenue, New York, NY 10016-5997, USA Copyright 2006 by the Institute of Electrical and Electronics Engineers, Inc. All rights reserved. Published 29 September 2006. Printed in the United States of America. IEEE is a registered trademark in the U.S. Patent +1 978 750 8400. Permission
9、 to photocopy portions of any individual standard for educational classroom use can also be obtained through the Copyright Clearance Center. Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=NASA Technical Standards 1/9972545001 Not
10、 for Resale, 04/25/2007 02:46:46 MDTNo reproduction or networking permitted without license from IHS -,-,- iv Copyright 2006 IEEE. All rights reserved. Introduction This standard supersedes IEEE Std 270-1966. Since the 1966 standard was approved, significant changes have occurred in the Internationa
11、l System of Units (SI). Corresponding updates have been issued for some of the documents referred to in this standard. Significantly, those updates represent a movement toward greater formalism in dealing with quantities and valuesan area that has become known as the quantity calculus. Those updates
12、 also represent a movement toward global consensus, necessary for international harmonization of standards, which is needed for an increasingly global economy. The global community has made great strides toward universally recognized and used units that transcend language groups, fields of study, an
13、d industries. The once common use of thousands of units, some arcane and used only in small fields, others more popularly used but varying in definition, has been replaced by a very small set of simple and well-defined units, the SI. Those defined units are based on fundamental physical quantities.
14、The SI is a practical system. The Eighth Edition of the BIPM brochure B1a on the International System of Units states “The definitions of the base units of the SI were adoped in a context that takes no account of relativistic effects. When such account is taken, it is clear that the definitions appl
15、y only in a small spatial domain sharing the motion of the standards that realize them.” The SI includes simple rules that provide robust means by which to combine that small set of units to meet nearly every need in commerce, science, engineering, and technology. Necessarily, the parsimonious natur
16、e of this system requires exacting compliance with the rules provided for using those unitsa “grammar” that is as tight as its vocabulary is “succinct.” The global movement toward universally recognized and used quantities is paralleling the progress made on units, but it is not as greatly advanced.
17、 Nonetheless, great strides have been made and, increasingly, international consensus is consolidating the thousands of variants for quantity names and symbols to a smaller set. This consolidation of system of quantities, too, requires the use of rigid rules of the quantity calculuss “grammar” to en
18、sure universal understanding and usefulness. It is appropriate, therefore, that the IEEE make this standard available to describe quantities commonly used or encountered in its community. Notice to users Errata Errata, if any, for this and all other standards can be accessed at the following URL: ht
19、tp:/ standards.ieee.org/reading/ieee/updates/errata/index.html. Users are encouraged to check this URL for errata periodically. Interpretations Current interpretations can be accessed at the following URL: http:/standards.ieee.org/reading/ieee/interp/ index.html. _ a The numbers in brackets correspo
20、nd to those of the bibliography in Annex B. This introduction is not part of IEEE Std 270-2006, IEEE Standard Definitions for Selected Quantities, Units, and Related Terms, with Special Attention to the International System of Units (SI). Copyright The Institute of Electrical and Electronics Enginee
21、rs, Inc. Provided by IHS under license with IEEELicensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 02:46:46 MDTNo reproduction or networking permitted without license from IHS -,-,- v Copyright 2006 IEEE. All rights reserved. Patents Attention is called to the possibility that
22、 implementation of this standard may require use of subject matter covered by patent rights. By publication of this standard, no position is taken with respect to the existence or validity of any patent rights in connection therewith. The IEEE shall not be responsible for identifying patents or pate
23、nt applications for which a license may be required to implement an IEEE standard or for conducting inquiries into the legal validity or scope of those patents that are brought to its attention. Participants At the time this standard was completed, the Definitions (SCC14.2) Working Group had the fol
24、lowing membership: Theodore Wildi, Chair Gordon Aubrecht Bruce B. Barrow James R. Frysinger Barry N. Taylor Ambler Thompson John T. Scott The following members of the balloting committee voted on this standard as individuals. Balloters may have voted for approval, disapproval, or abstention. William
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