1、 IEC 61298-2 Edition 2.0 2008-10 INTERNATIONAL STANDARD NORME INTERNATIONALE Process measurement and control devices General methods and procedures for evaluating performance Part 2: Tests under reference conditions Dispositifs de mesure et de commande de processus Mthodes et procdures gnrales dvalu
2、ation des performances Partie 2: Essais dans les conditions de rfrence IEC 61298-2:2008 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2008 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any mea
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16、ires sur cette publication ou si vous avez des questions, visitez le FAQ du Service clients ou contactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 61298-2 Edition 2.0 2008-10 INTERNATIONAL STANDARD NORME INTERNATIONALE Process measurement and control devices General meth
17、ods and procedures for evaluating performance Part 2: Tests under reference conditions Dispositifs de mesure et de commande de processus Mthodes et procdures gnrales dvaluation des performances Partie 2: Essais dans les conditions de rfrence INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECT
18、ROTECHNIQUE INTERNATIONALE U ICS 25.040.40 PRICE CODE CODE PRIX ISBN 2-8318-1003-1 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale 2 61298-2 IEC:2008 CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope.7 2 Normative reference
19、s .7 3 Terms and definitions .7 4 Accuracy related factors .10 4.1 Test procedures and precautions 10 4.1.1 Selection of ranges for test10 4.1.2 Preconditioning cycles.11 4.1.3 Number of measurement cycles and test points.11 4.1.4 Additional tests where digital inputs and outputs are provided .11 4.
20、1.5 Measurement procedure11 4.1.6 Processing of the measured values .12 4.1.7 Determination of accuracy related factors12 4.1.8 Presentation of the results.16 4.2 Specific testing procedures and precautions for the determination of dead band16 4.2.1 Selection of ranges for test and preconditioning 1
21、6 4.2.2 Measurement procedure16 4.2.3 Presentation of the results.17 5 Dynamic behaviour.17 5.1 General considerations17 5.2 General testing procedures and precautions17 5.3 Frequency response17 5.4 Step response.18 6 Functional characteristic.18 6.1 General .18 6.2 Input resistance of an electrical
22、 device18 6.3 Insulation of electrical devices.21 6.3.1 General considerations21 6.3.2 Insulation resistance21 6.3.3 Dielectric strength .22 6.4 Power consumption.22 6.4.1 Electrical power consumption 22 6.4.2 Air consumption.22 6.5 Output ripple of a device with an electrical d.c. output.23 6.6 Air
23、 flow characteristics of a pneumatic device .23 6.6.1 Initial setting up.23 6.6.2 Delivered flow Q 1 23 6.6.3 Exhausted flow Q 2 .24 6.6.4 Data presentation 24 6.7 Limits of adjustments of lower range value and span.25 6.8 Switching differential .25 7 Drift25 7.1 Start-up drift25 7.2 Long-term drift
24、.25 61298-2 IEC:2008 3 Figure 1 Error curves .15 Figure 2 Two examples of frequency response 19 Figure 3 Two examples of responses to a step input20 Figure 4 Test set-up for input resistance21 Figure 5 Test arrangement for measurement of airflow characteristics .23 Figure 6 Typical air flow characte
25、ristics .24 Table 1 Settings of span and lower range value adjustments .11 Table 2 Number of measurement cycles and number and location of test points 12 Table 3 Typical table of device errors 14 Table 4 Dielectric strength test voltages 22 4 61298-2 IEC:2008 INTERNATIONAL ELECTROTECHNICAL COMMISSIO
26、N _ PROCESS MEASUREMENT AND CONTROL DEVICES GENERAL METHODS AND PROCEDURES FOR EVALUATING PERFORMANCE Part 2: Tests under reference conditions FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical comm
27、ittees (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 Specifications, Technica
28、l 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, governmental
29、 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 decisions or agre
30、ements 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 international use
31、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 order to promot
32、e 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 clearly indicat
33、ed in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to
34、 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, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
35、 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 this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9)
36、 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 any or all such patent rights. International Standard IEC 61298-2 has been prepared by subcommittee 65B: Devices and process
37、 analysis, of IEC technical committee 65: Industrial-process measurement, control and automation. This second edition cancels and replaces the first edition published in 1995 and constitutes a technical revision. This edition is a general revision with respect to the previous edition and does not in
38、clude any significant changes (see Introduction). 61298-2 IEC:2008 5 The text of this standard is based on the following documents: FDIS Report on voting 65B/686/FDIS 65B/694/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the ab
39、ove table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts of the IEC 61298 series, under the general title Process measurement and control devices General methods and procedures for evaluating performance, can be found on the IEC website. The
40、 committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by
41、a revised edition, or amended. 6 61298-2 IEC:2008 INTRODUCTION This standard is not intended as a substitute for existing standards, but is rather intended as a reference document for any future standards developed within the IEC or other standards organizations, concerning the evaluation of process
42、 instrumentation. Any revision of existing standards should take this standard into account. This common standardized basis should be utilised for the preparation of future relevant standards, as follows: any test method or procedure, already treated in this standard, should be specified and describ
43、ed in the new standard by referring to the corresponding clause of this standard. Consequently new editions of this standard are revised without any change in numbering and scope of each clause; any particular method or procedure, not covered by this standard, should be developed and specified in th
44、e new standard in accordance with the criteria, as far as they are applicable, stated in this standard; any conceptual or significant deviation from the content of this standard, should be clearly identified and justified if introduced in a new standard. 61298-2 IEC:2008 7 PROCESS MEASUREMENT AND CO
45、NTROL DEVICES GENERAL METHODS AND PROCEDURES FOR EVALUATING PERFORMANCE Part 2: Tests under reference conditions 1 Scope This part of IEC 61298 specifies general methods and procedures for conducting tests and reporting on the functional and performance characteristics of process measurement and con
46、trol devices. The tests are applicable to any such devices characterized by their own specific input and output variables, and by the specific relationship (transfer function) between the inputs and outputs, and include analogue and digital devices. For devices that require special tests, this stand
47、ard should be used, together with any product specific standard specifying special tests. This standard covers tests made under reference conditions. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the editi
48、on cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050-300, International Electrotechnical Vocabulary (IEV) Electrical and electronic measurements and measuring instruments (composed of Part 311, 312, 313 and 314) IEC 600
49、50-351, International Electrotechnical Vocabulary (IEV) Part 351 : Control technology IEC 61298-1, Process measurement and control devices General methods and procedures for evaluating performance Part 1: General considerations IEC 61010-1, Safety requirements for electrical equipment for measurement, control, and laboratory use Part 1: General requirements 3 Terms and
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