1、Identification of units of measurement for computer- based processing PD IEC/TS 62720:2017 BSI Standards Publication WB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06National foreword This Published Document is the UK implementation of IEC/TS 62720:2017. It supersedes PD IEC/TS 62720:2013 whi
2、ch is withdrawn. The UK participation in its preparation was entrusted to Technical Committee GEL/3, Documentation and graphical symbols. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary
3、provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017. Published by BSI Standards Limited 2017 ISBN 978 0 580 95662 1 ICS 01.040.35; 01.060; 35.240.60 Compliance with a British Standard cannot confer immunity from legal obligations. This
4、Published Document was published under the authority of the Standards Policy and Strategy Committee on 28 February 2017. Amendments/corrigenda issued since publication Date Text affected PUBLISHED DOCUMENT PD IEC/TS 62720:2017 IEC TS 62720 Edition 2.0 2017-01 TECHNICAL SPECIFICATION Identification o
5、f units of measurement for computer-based processing INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 01.040.35; 01.060; 35.240.60 ISBN 978-2-8322-3863-9 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distri
6、butor. PD IEC/TS 62720:2017 2 IEC TS 62720:2017 IEC 2017 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope 6 2 Normative references 6 3 Terms and definitions 6 4 Relations between quantities, units and their systems . 13 4.1 General . 13 4.2 The International System of Quantities and the International
7、System of Units . 13 4.3 Other systems of quantities and units . 15 4.4 List of quantities and units 15 5 Prefixes and prefix symbols . 15 5.1 General . 15 5.2 Formation of multiples and factors 15 5.3 Usage of SI prefixes and SI prefix symbols . 17 5.3.1 General . 17 5.3.2 Combination of SI prefixe
8、s, SI prefix symbols, names of units and symbols for units . 17 5.3.3 Use of power exponentials in conjunction with SI prefixes, SI prefix symbols, names of units or symbols for units. 18 5.3.4 Restrictions on combining SI prefixes, SI prefix symbols, names of units and symbols for units . 18 5.4 Se
9、lecting SI prefixes and SI prefix symbols . 18 6 Identification of units . 19 Annex A (informative) Information about units 21 Annex B (normative) Identifiers for units and quantities . 22 Annex C (informative) Quantities and assigned units of measure . 23 Bibliography 86 Figure 1 International Regi
10、stration Data Identifier (IRDI) 19 Table 1 Examples of generic concepts for individual quantities 7 Table 2 Base quantity and base unit 8 Table 3 Base quantities . 10 Table 4 Base quantities and base units in the International System of Units 14 Table 5 Representation of base quantities in the Inter
11、national System of Units . 14 Table 6 Formation of multiples and factors of units to the base of 10 . 16 Table 7 Formation of multiples of units to the base of 2 . 17 Table 8 Units that are used without prefixes or prefix symbols 18 Table C.1 Codes of quantities 23 Table C.2 Codes of units 35 PD IEC
12、/TS 62720:2017IEC TS 62720:2017 IEC 2017 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ IDENTIFICATION OF UNITS OF MEASUREMENT FOR COMPUTER-BASED PROCESSING FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrot
13、echnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specificati
14、ons, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International,
15、 governmental and non- governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal deci
16、sions or agreements of 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 IEC National Committees. 3) IEC Publications have the form of recommendations for inter
17、national use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In or
18、der to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be cl
19、early indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification
20、 bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, pro
21、perty damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in
22、 this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying an
23、y or all such patent rights. The main task of IEC technical committees is to prepare International Standards. In exceptional circumstances, a technical committee may propose the publication of a technical specification when the required support cannot be obtained for the publication of an Internatio
24、nal Standard, despite repeated efforts, or the subject is still under technical development or where, for any other reason, there is the future but no immediate possibility of an agreement on an International Standard. Technical specifications are subject to review within three years of publication
25、to decide whether they can be transformed into International Standards. International Standard IEC 62720, which is a technical specification, has been prepared by subcommittee 3D: Product properties and classes and their identification, of IEC technical committee 3: Information structures and elemen
26、ts, identification and marking principles, documentation and graphical symbols. PD IEC/TS 62720:2017 4 IEC TS 62720:2017 IEC 2017 This second edition cancels and replaces the first edition published in 2013. This edition constitutes a technical revision. This edition includes the following significa
27、nt technical changes with respect to the previous edition: a) the detailed description of the units is contained in the IEC CDD (http:/cdd.iec.ch/ 1 ) and removed from this document; b) Annex B contains the reference to the IEC CDD; c) Annex C contains an abridged listing of quantities, units and th
28、eir identifying codes; d) Annexes D and E are removed. The text of this technical specification is based on the following documents: Enquiry draft Report on voting 3D/282/DTS 3D/289/RVC Full information on the voting for the approval of this technical specification can be found in the report on voti
29、ng indicated in the above table. This document has been drafted in accordance with the ISO/IEC Directives, Part 2. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data rel
30、ated to the specific publication. At this date, the publication will be transformed into an International standard, reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. _ 1Website checked on 2016-06-10. PD IEC/TS 62
31、720:2017IEC TS 62720:2017 IEC 2017 5 INTRODUCTION For the interpretation of documents such as data sheets, catalogues, or other product related documentation, units of measure play an inconspicuous but important role. All quantitative data can be prone to misinterpretation if its unit of measure is
32、unclear or wrong. Thus, there is a strong requirement to unambiguously identify units of measure and ensure that each unit of measure and its underlying quantity is clearly specified. As a consequence there is a need to provide computer interpretable identifiers for units of measure. This document a
33、ssigns identifiers to many standard or non-standard units of measure currently in use. To ensure timely and fast maintenance of the collection, the content of the document is provided in the IEC Common Data Dictionary (CDD), thus making possible easy maintenance and fast introduction of missing unit
34、s of measure and quantities. PD IEC/TS 62720:2017 6 IEC TS 62720:2017 IEC 2017 IDENTIFICATION OF UNITS OF MEASUREMENT FOR COMPUTER-BASED PROCESSING 1 Scope This document specifies identifiers for units to support computer-based processing of product data. It provides a survey of quantities with asso
35、ciated collections of internationally standardized as well as nonstandardized units used in business and science. Within the scope of this document are any standard or non-standard units of measure currently in use, in two or more distinct ethno-linguistic groups or nations, at least in one domain o
36、f industry, for which an explicit method of conversion to a known standard unit of measure or its equivalent is well documented or evident from external references. IEC 62720 collects units commonly used in business data. It does not purport to be complete. The standardization of units or parts ther
37、eof is out of the scope of this document. NOTE Having assigned an identifier by being mentioned in this document does not imply that the unit of measure in question or parts thereof can be considered to be standardized. 2 Normative references The following documents are referred to in the text in su
38、ch a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO/IEC 11179 (all parts), Information technology Meta
39、data registries (MDR) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online brows
40、ing platform: available at http:/www.iso.org/obp 3.1 quantity property of a phenomenon, body, or substance, where the property has a magnitude that can be expressed by means of a number and a reference Note 1 to entry: The generic concept “quantity” can be divided into several levels of specific con
41、cepts, as shown in Table 1. The left hand side of the table shows specific concepts under “quantity”. These are generic concepts for the individual quantities in the right hand column. PD IEC/TS 62720:2017IEC TS 62720:2017 IEC 2017 7 Table 1 Examples of generic concepts for individual quantities Gen
42、eric concepts for individual quantities Individual quantities length, l radius, r radius of circle A, r A or r(A) wavelength, wavelength of the sodium D radiation, Dor (D; Na) energy, E kinetic energy, T kinetic energy of particle i in a given system, T iheat, Q heat of vaporization of sample i of w
43、ater, Q ielectric charge, Q electric charge of the proton, e electric resistance, R electric resistance of resistor i in a given circuit, R iamount-of-substance concentration of entity B, c Bamount-of-substance concentration of ethanol in wine sample i, c i(C 2 H 5 OH) number concentration of entity
44、 B, C Bnumber concentration of erythrocytes in blood sample i, C(Erys; B i ) Rockwell C hardness (150 kg load), HRC (150 kg) Rockwell C hardness of steel sample i, HRC i(150 kg) Note 2 to entry: A reference can be a measurement unit, a measurement procedure, a reference material, or a combination of
45、 them. For magnitude of a quantity. Note 3 to entry: Symbols for quantities are given in the International Standard ISO/IEC 80000, Quantities and units. The symbols for quantities are written in italics. A given symbol can indicate different quantities. Note 4 to entry: A quantity as defined here is
46、 a scalar. However, a vector or a tensor, the components of which are quantities, is also considered to be a quantity. Note 5 to entry: The concept “quantity” may be generically divided into, e.g. “physical quantity”, “chemical quantity”, and “biological quantity”, or “base quantity” and “derived qu
47、antity”. SOURCE: ISO 80000-1:2009, 3.1, modified Note 6 omitted. 3.2 system of quantities set of quantities together with a set of non-contradictory equations relating those quantities Note 1 to entry: Ordinal quantities such as Rockwell C hardness, and nominal properties such as colour of light, ar
48、e usually not considered to be part of a system of quantities because they are related to other quantities through empirical relations only. SOURCE: ISO 80000-1:2009, 3.3, modified Note 2 omitted. 3.3 International System of Quantities ISQ system of quantities based on the seven base quantities: len
49、gth, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity Note 1 to entry: This system of quantities is published in the International Standard ISO/IEC 80000, Quantities and units, Parts 3 to 14. Note 2 to entry: The International System of Units is based on the International System of Quantities. SOURCE: ISO 80000-1:2009, 3.6, modified Note 3 omitted. 3.4 International System of Units SI system of units based on t
