BS-7998-3-2002 IEC-60027-3-2002.pdf
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1、BRITISH STANDARD BS 7998-3:2002 IEC 60027-3:2002 Letter symbols to be used in electrical technology Part 3: Logarithmic and related quantities, and their units ICS 01.075; 01.060 ? Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:00:50 GMT+00:00 2006, Uncontro
2、lled Copy, (c) BSI BS 7998-3:2002 This British Standard, having been prepared under the direction of the Management Systems Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 7 November 2002 BSI 7 November 2002 ISBN 0 580 40651 2
3、 National foreword This British Standard reproduces verbatim IEC 60027-3:2002 and implements it as the UK national standard. It supersedes BS 7998-3:2002 (January edition) which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee SS/7, General metrology, quanti
4、ties, units and symbols which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue
5、 under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct
6、 application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests inform
7、ed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the IEC title page, pages 2 to 13 and a back cover. The BSI copyright date displayed in this document indicates when the document
8、was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:00:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI NORME INTERNATIONALE CEI IEC INTERNATIONAL STANDARD 60027-3 Troisime dition Third editi
9、on 2002-07 Symboles littraux utiliser en lectrotechnique Partie 3: Grandeurs logarithmiques et connexes, et leurs units Letter symbols to be used in electrical technology Part 3: Logarithmic and related quantities, and their units Numro de rfrence Reference number CEI/IEC 60027-3:2002 BS 79983:2002
10、Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:00:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CONTENTS FOREWORD. 3 1 Scope . 4 2 Normative references. 4 3 Logarithmic quantities 4 4 Logarithmic ratios of field quantities and power quantities 5 4.1 Logarith
11、mic ratios of field quantities 5 4.2 Logarithmic ratios of power quantities 7 4.3 Levels 9 4.4Additional information on logarithmic ratios of field quantities and power quantities.10 5 Logarithmic information-theory quantities11 6 Other logarithmic quantities 12 6.1 General .12 6.2 Logarithmic frequ
12、ency interval.12 7 Names, symbols, and definitions.13 2 BS 79983:2002 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:00:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI INTERNATIONAL ELECTROTECHNICAL COMMISSION _ LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLO
13、GY Part 3: Logarithmic and related quantities, and their units FOREWORD 1)The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote internation
14、al co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, the IEC publishes International Standards. Their preparation is entrusted to technical committees; any IEC National Committee interested in the subjec
15、t dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. The IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions d
16、etermined by agreement between the two organizations. 2)The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested National Com
17、mittees. 3)The documents produced have the form of recommendations for international use and are published in the form of standards, technical specifications, technical reports or guides and they are accepted by the National Committees in that sense. 4) In order to promote international unification,
18、 IEC National Committees undertake to apply IEC International Standards transparently to the maximum extent possible in their national and regional standards. Any divergence between the IEC Standard and the corresponding national or regional standard shall be clearly indicated in the latter. 5) The
19、IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with one of its standards. 6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent right
20、s. The IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60027-3 has been prepared by IEC technical committee 25: Quantities and units, and their letter symbols. This third edition of IEC 60027-3 cancels and replaces the second edition publis
21、hed in 1989, its amendment 1 (2000) and constitutes a technical revision. The text of this standard is based on the following documents: FDISReport on voting 25/251/FDIS25/253/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the a
22、bove table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 3. The committee has decided that the contents of this publication will remain unchanged until 2007. At this date, the publication will be reconfirmed; withdrawn; replaced by a revised edition, or amended.
23、3 BS 79983:2002 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:00:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY Part 3: Logarithmic and related quantities, and their units 1 Scope This part of IEC 60027 give
24、s general information about logarithmic and related quantities, and their units. Names and symbols for logarithmic quantities are given in other parts of IEC 60027, mainly in part 2, in the context where they belong. 2 Normative references The following referenced documents are indispensable for the
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