1、 IEC TS 62720 Edition 2.0 2017-01 TECHNICAL SPECIFICATION Identification of units of measurement for computer-based processing IEC T S 62720:2017-01(en)THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2017 IEC,Geneva,Switzerland All rights reserved.Unless otherwise specified,no part of this publica
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10、blication or need fur ther assistance,plea se contact the Customer Ser v ice Centre:csciec.ch.IEC TS 62720 Edition 2.0 2017-01 TECHNICAL SPECIFICATION Identification of units of measurement for computer-based processing INT ERNAT IONAL ELECT ROT ECHNICAL COMMISSION ICS 01.040.35;01.060;35.240.60 ISB
11、N 978-2-8322-3863-9 Registered t rademark of the Internat ional Electrotechnica l Commission Warning!Mak e sure that you obtained this publication from an authorized distributor.2 IEC TS 62720:2017 IEC 2017 CONTENTS FOREWORD.3 INTRODUCTION.5 1 Scope.6 2 Normative references.6 3 Terms and definitions
12、.6 4 Relations between quantities,units and their systems.13 4.1 General.13 4.2 The International System of Quantities and the International 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 Formati
13、on 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 prefixes,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
14、 units.18 5.3.4 Restrictions on combining SI prefixes,SI prefix symbols,names of units and symbols for units.18 5.4 Selecting 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 Ann
15、ex C(informative)Quantities and assigned units of measure.23 Bibliography.86 Figure 1 International Registration 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
16、 units in the International System of Units.14 Table 5 Representation of base quantities in the International 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 IEC TS 62720:2017 IEC 2017 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ IDENTIFICATION OF UNITS OF MEASUREMENT
