BS-7998-3-2002-VERSION-1 IEC-60027-3-1989-HD-245.3-S3-2001.pdf

BRITISH STANDARD BS 7998-3:2002 HD 245.3 S3: 2001 IEC 60027-3: 1989 Letter symbols to be used in electrical technology Part 3: Logarithmic quantities and units ICS 01.075; 29.020 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:00:50 GMT+00:00 2006, Uncontrolled 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 30 January 2002 © BSI 30 January 2002 The following BSI reference relates to work on this standard: Committee reference SS/7 ISBN 0 580 38563 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee SS/7, General metrology, quantities, units and symbols, upon which the following bodies were represented: British Measurement and Testing Association City University DTI National Weights and Measures Laboratory Federation of Small Businesses Institute of Measurement and Control Institution of Electrical Engineers Institution of Mechanical Engineers National Physical Laboratory Royal Society of Chemistry Society of Chemical Industry Trading Standards Institute 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 BS 7998-3:2002 © BSI 30 January 2002 i Contents National forewordii Scope and Introduction3 1Logarithmic quantities3 2Units for logarithmic quantities6 3Numerical values of logarithmic quantities7 4Logarithmic quantities with units8 5Notation for expressing the reference of a level11 Annex ZA (normative) Normative references to international publications with their corresponding European publications 13 National annex NA (normative) Amendment 1 to International Standard IEC 60079-3:198914 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:00:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7998-3:2002 ii© BSI 30 January 2002 National foreword This British Standard reproduces verbatim the English language content of IEC 60027-3:1989, published by International Electrotechnical Commission (IEC). This British Standard is also in agreement with Harmonized Document HD 245.3 S3:2001, which was published by the European Committee for Electrotechnical Standardization (CENELEC). National annex NA reproduces verbatim Amendment 1 to IEC 60027-3:1989, published March 2000. IEC 60027 consists of general and specific parts with purely electric character, under the title Letter symbols to be used in electrical technology. Only the specific parts with electric character will be published in this series, as the general parts will be harmonized with the ISO 31 series (to form ISO 80000 series) including Part 1. Other parts comprise: Part 2: Telecommunications and electronics; Part 3: Logarithmic quantities and units. This British Standard has been numbered Part 3 to reflect the fact there are other parts in the IEC series. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the HD title page, the HD foreword, pages 3 to 15 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:00:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI HARMONIZATION DOCUMENTHD 245.3 S3 DOCUMENT D'HARMONISATION HARMONISIERUNGSDOKUMENTJuly 2001 CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels © 2001 CENELEC -All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. HD 245.3 S3:2001 E ICS 01.060Supersedes HD 245.3 S2:1991 English version Letter symbols to be used in electrical technology Part 3: Logarithmic quantities and units (IEC 60027-3:1989 + A1:2000) Symboles littéraux à utiliser en électrotechnique Partie 3: Grandeurs et unités logarithmiques (CEI 60027-3:1989 + A1:2000) Formelzeichen für die Elektrotechnik Teil 3: Logarithmische Größen und Einheiten (IEC 60027-3:1989 + A1:2000) This Harmonization Document was approved by CENELEC on 2001-05-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for implementation of this Harmonization Document on a national level. Up-to-date lists and bibliographical references concerning such national implementation may be obtained on application to the Central Secretariat or to any CENELEC member. This Harmonization Document exists in three official versions (English, French, German). CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:00:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Foreword The text of the International Standard IEC 60027-3:1989 + A1:2000, prepared by IEC TC 25, Quantities and units, and their letter symbols, was submitted to the formal vote and was approved by CENELEC as HD 245.3 S3 on 2001-05-01 without any modification. This Harmonization Document supersedes HD 245.3 S2:1991. The following dates were fixed: latest date by which the existence of the HD has to be announced at national level(doa) 2001-10-01 latest date by which the HD has to be implemented at national level by publication of a harmonized national standard or by endorsement(dop) 2002-04-01 latest date by which the national standards conflicting with the HD have to be withdrawn(dow) 2004-04-01 Annexes designated “normative“ are part of the body of the standard. In this standard, annex ZA is normative. Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60027-3:1989 + A1:2000 was approved by CENELEC as a Harmonization Document without any modification. _ BS 79983:2002 2 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:00:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 79983:2002 3 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:00:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 79983:2002 4 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:00:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 79983:2002 5 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:00:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 79983:2002 6 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:00:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 79983:2002 7 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:00:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 79983:2002 8 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:00:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 79983:2002 9 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:00:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 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 BS 79983:2002 11 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:00:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 79983:2002 12 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:00:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Annex ZA (normative) Normative references to international publications with their corresponding European publications This Harmonization Document incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this Harmonization Document only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). NOTEWhen an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. PublicationYearTitleEN/HDYear IEC 60050-7021992International electrotechnical vocabulary - Chapter 702: Oscillations, signals and related devices - ISO 31-111978Mathematical signs and symbol for use in the physical sciences and technology - ISO 2382-161996Information technology - Vocabulary Part 16: Information theory - BS 79983:2002 13 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:00:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI National annex NA (normative) Amendment 1 to International Standard IEC 60027-3:1989 National annex NA reproduces verbatim the text of Amendment 1 to International Standard IEC 60027-3:1989, published 1 March 2000 BS 79983:2002 14 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:00:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI FOREWORD This amendment has been prepared by IEC technical committee 25: Quantities and units, and their letter symbols. The text of this amendment is based on the following documents: FDISReport on voting 25/232/FDIS25/233/RVD Full information on the voting for the approval of this amendment can be found in the report on voting indicated in the above table. The committee has decided that the contents of the base publication and its amendments will remain unchanged until 2002. At this date, the publication will be reconfirmed; withdrawn; replaced by a revised edition, or amended. _ Page 11 Replace the existing subclause 1.5 by the following new subclause: 1.5 Quantities related to information decision content (IEV 702-04-20 and ISO/IEC 2382-16.03.01*) The logarithm of the number of events in a finite set of mutually exclusive events H0 = loga n where n is the number of events. In short: loga (number of events) NOTE The number of single decisions needed to select a specific event out of a finite set of mutually exclusive events equals the smallest integer which is greater than or equal to the decision content expressed with the base a of the logarithm being equal to the number of possible choices at each decision. This is applicable when a is a positive integer greater than 1. _ _ * IEC 60050(702):1992, International Electrotechnical Vocabulary (IEV) Chapter 702: Oscillations, signals and related devices; ISO/IEC 2382-16:1996, Information technology Vocabulary Part 16: Information theory. BS 79983:2002 15 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:00:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7998-3:2002 HD 245.3 S3: 2001 IEC 60027-3: 1989 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. 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