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1、BRITISH STANDARD BS 4889:1990 Method for specifying the Performance of electrical and electronic measuring equipment Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 30 08:37:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4889:1990 This British Standard, having been prepared under the direction
2、 of the Electronic Equipment Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 31 July 1990 BSI 08-1999 First published May 1973 Second edition July 1990 The following BSI references relate to the work on this standard: Committee reference EEL
3、/8 Draft for comment 80/25077 DC ISBN 0 580 18227 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Electronic Equipment Standards Policy Committee (EEL/-) to Technical Committee EEL/8, upon which the following bodies were represented: B
4、ritish Telecommunications plc Department of Trade and Industry, National Physical Laboratory Department of Trade and Industry, National Measurement Accreditation Service Electricity Supply Industry in England and Wales Electronic Engineering Association GAMBICA (BEAMA Ltd) ITV Association Independen
5、t Broadcasting Authority Institution of Electronic and Radio Engineers International Association of Broadcasting Manufacturers Ministry of Defence Telecommunication Engineering and Manufacturing Association Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffield
6、un, na, Thu Nov 30 08:37:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4889:1990 BSI 08-1999i Contents Page Committees responsible Inside front cover Foreword ii Introduction 1 Section 1. General principles 1Scope2 2Object2 3Quantities, values and ranges to be stated and measured2 Section 2. Defi
7、nitions 4Definitions3 Section 3. Procedure for specification 5Specification of values and ranges4 6Requirements for IEC product standards5 7Specification of limits of error5 8Choise of influence quantities5 Section 4. Procedure for compliance testing 9General rules6 10Measurement of intrinsic error
8、and variations6 11Confirmation of compliance with specified limits of error8 12Testing for environmental damage9 13Allowing for effect of test equipment9 14Condition of equipment under test9 15Reference operating conditions9 Appendix A Statistical calculation of operating error11 Appendix B Environm
9、ental requirements of the first edition of publication 35912 Table I Values and ranges for measurement of variations7 Table IIa Possible types of variation and the effects caused8 Table IIb Measuring conditions for variations8 Publications referred to Inside back cover Licensed Copy: sheffieldun she
10、ffieldun, na, Thu Nov 30 08:37:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4889:1990 ii BSI 08-1999 Foreword This British Standard has been prepared under the direction of the Electronic Equipment Standards Policy Committee and forms a revision of BS 4889:1973 which is withdrawn. It is technica
11、lly equivalent to IEC Publication 359 “Expression of the performance of electrical and electronic measuring equipment” published in 1987 by the International Electrotechnical Commission. The difference between the two standards lies in the omission in BS 4889 of subclause 3.5 of IEC Publication 359.
12、 This subclause contains a statement to the effect that the manufacturer is not responsible for injury or defect arising from excessive operating and worst-case errors. Such a statement has no validity in the United Kingdom where Statute Law prohibits the exclusion of liability for death or personal
13、 injury. For ease of production, the IEC text has been retained. Cross-references International StandardCorresponding British Standard BS 4727 Glossary of electrotechnical, power, telecommunication, electronics, lighting and colour terms Part 1 Terms common to power, telecommunications and electroni
14、cs IEC 50 Chapter 131:1978 Group 01:1983 Fundamental terminology (Technically equivalent) IEC 50 Chapters 301, 302, 303 Group 04:1986 Measurement terminology (Technically equivalent) IEC 68BS 2011 Environmental testing IEC 529:1976BS 5490:1977 Specification for classification of degrees of protectio
15、n provided by enclosures (Identical) BS 5967 Operating conditions for industrial-process measurement and control equipment IEC 654-1:1979Part 1:1980 Specification for temperature, humidity and barometric pressure (Identical) IEC 654-2:1979Part 2:1980 Specification for power (Identical) IEC 654-3:198
16、3Part 3:1984 Methods for assessing degree of immunity of systems or parts of systems when subjected to mechanical influences (Identical) BS 6253 Electrical measuring transducers for converting a.c. electrical quantities into d.c. electrical quantities IEC 688-1:1980Part 1:1982 Method for specifying
17、general purpose transducers (Identical) IEC 816:1984BS 6662:1985 Guide to methods of measurement of short duration transients on low voltage power and signal lines (Identical) Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 30 08:37:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4889:1990 BSI
18、08-1999iii The Technical Committee has reviewed the provisions of IEC 51, IEC 160 (1963), IEC 258 (1968), IEC 484 (1974), IEC 555-1 (1982), IEC 551-2 (1982), IEC 551-3 (1982), IEC 721-3 (1984), IEC 725 (1981) to which reference is made in the text, and has decided that they are acceptable for use in
19、 conjunction with this standard. There are no equivalent British Standards for the latest editions of IEC 51. These, however, are to be implemented by the revision of BS 89:1977. There are also no equivalent British Standards for IEC 160 (1963), IEC 721-3 (1984), IEC 555-1 (1982), IEC 555-3 (1982) a
20、nd IEC 725 (1981). NOTETypographical errors. The following typographical errors have been noted in the IEC text. In the title of 4.8, for “Influence qunatity” read “Influence quantity”. In the note to 4.13, the words “of use” following “nominal range” should be included within the quotation marks. A
21、 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
22、 front cover, an inside front cover, pages i to iv, pages 1 to 16, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun
23、sheffieldun, na, Thu Nov 30 08:37:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 30 08:37:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4889:1990 BSI 08-19991 Introduction Relationship to existing methods of specification 1) The two limi
24、ts of error of the value of a performance characteristic appearing in a technical specification should not be exceeded in spite of all specified changes in the environment, in the supply source, and in any other performance characteristic, and these changes should simulate the probable working condi
25、tions. This is so that, knowing the permissible overall error of a process or system, a measuring instrument or system may be chosen having adequate accuracy. 2) In the field of electronic measuring equipment, the first edition of IEC Publication 359 (1971) recognized the concept of intrinsic error
26、and influence errors, and used the system of specifying the operating error. This error is valid under the least favourable combination of values of influence quantities within their ranges, which are specified along with operating groups referring to severities of environment. This system has been
27、found useful for equipment which measures several parameters of one phenomenon. However, the determination of the most unfavourable combination of influence conditions and the production of combinations of conditions for testing are difficult and uneconomic. 3) In the field of electrical measuring i
28、nstruments, IEC Publication 51, for example, recognizes the concept of intrinsic error and variations, and uses the system of specifying accuracy classes. These classes relate to ranges of influence quantities prescribed in IEC Publication 51, but not in relation to particular environments. This sys
29、tem has been found useful from the viewpoints of both manufacturers and users, particularly for economic reasons. Intrinsic errors are moderately easy to determine and they are useful for acceptance testing and referee testing; however, they provide no information about any worsening of performance
30、which may take place under the less favourable conditions of actual use. Nonetheless, the system provides some hints about the operating error by determining the change in error (the variation) produced by each influence quantity separately when it is changed from its reference value to one or the o
31、ther of the limits of a range prescribed in the IEC product standard covering the particular kind of instrument. However, since all the other influence quantities are kept at their reference values, no information is determined about the effect of several influence quantities which simultaneously de
32、part from their reference values. 4) In the field of analysing equipment, no fixed system prevails at present. In the field of process control equipment, the concept of intrinsic error and variations is basically adopted. Influence quantities other than those recognized for measuring equipment are o
33、f major importance. 5) It is impossible for a manufacturer to comply with conflicting requirements which the different disciplines of his various purchasers may have, and so it has become indispensable to introduce a single general concept of errors which is appropriate to the different applications
34、 in the extensive fields of measurement. 6) Reference documents: a) The following IEC publications dealing in detail with subjects related to performance and errors: 50:International Electrotechnical Vocabulary, (IEV). 51:Direct Acting Indicating Analogue Electrical Measuring Instruments and their A
35、ccessories. 68:Basic Environmental Testing Procedures. 160 (1963):Standard Atmospheric Conditions for Test Purposes. 258 (1968):Direct Acting Recording Electrical Measuring Instruments and their Accessories. 484 (1974):Indirect Acting Electrical Measuring Instruments. Licensed Copy: sheffieldun shef
36、fieldun, na, Thu Nov 30 08:37:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4889:1990 2 BSI 08-1999 b) IEC publications dealing with disturbances on supply networks: Section 1. General principles 1 Scope This standard applies to the specification of the performance of the following kinds of elect
37、rical and electronic equipment and instruments and the accessories used with them: a) Those which measure electrical quantities (indicating and recording instruments). b) Those which supply measured electrical quantities (supply instruments), such as signal generators and some power supplies. c) Tho
38、se which measure non-electrical quantities using electrical means, excluding any parts, such as transducers, which provide an electrical analogue of the non-electrical quantity; and provided that there exists no IEC product standard relating to the equipment or its electrical or electronic parts whi
39、ch has requirements that contradict this standard. The expression of performance covers only the electrical or electronic part. 2 Object This standard provides methods for ensuring uniformity in the specification and measurement of errors of equipment within its scope. All other necessary requiremen
40、ts have been reserved for dependent IEC product standards pertaining to particular types of equipment which fall within the scope of this standard. For example: the selection of performance characteristics and their measuring ranges, and influence quantities and their specified operating ranges, is
41、reserved for IEC product standards. 3 Quantities, values and ranges to be stated and measured 3.1 In the manufacturers technical specification for measuring equipment, the quality of performance is defined by statements on the limits of error of the performance characteristics. A specification of li
42、mits of error provides one of the following kinds of information: a) Limits of intrinsic error and variations. b) Limits of operating error, calculated from a) above, using statistical methods. c) Worst-case error, calculated from a) above. 3.2 A reference value or reference range and an operating r
43、ange are defined for each influence quantity which the manufacturer takes into account. It is also useful to specify the limiting conditions and storage and transport conditions of each influence quantity. 3.3 Determination of limits of error is based on the measurement of intrinsic errors and varia
44、tions, followed by any necessary calculations. 3.4 Where limits of operating error are specified, the recommended method of measurement and calculation provides a probability of 95 % that the error will remain within the limits during use within the rated operating conditions. See Appendix A. 529 (1
45、976):Classification of Degrees of Protection Provided by Enclosures. 654:Operating Conditions for Industrial-process Measurement and Control Equipment. 688:Electrical Measuring Transducers for Converting A.C. Electrical Quantities into D.C. Electrical Quantities. 721-3 (1984): Classification of Envi
46、ronmental Conditions, Part 3: Classification of Groups of Environmental Parameters and their Severities. 555:Disturbances in supply systems caused by household appliances and similar electrical equipment. 555-1 (1982): Part 1: Definitions. 555-2 (1982): Part 2: Harmonics. 555-3 (1982): Part 3: Volta
47、ge fluctuations. 725 (1981):Considerations on reference impedances for use in determining the disturbance characteristics of household appliances and similar electrical equipment. 816 (1984):Guide on methods of measurement of short duration transients on low voltage power and signal lines. Licensed
48、Copy: sheffieldun sheffieldun, na, Thu Nov 30 08:37:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4889:1990 BSI 08-19993 Section 2. Definitions 4 Definitions The following definitions apply for the purposes of this standard. 4.1 true value (IEV 301-08-01 and VIM1) 1.18) the value which characteri
49、zes a quantity perfectly defined, in the conditions which exist when that quantity is considered NOTEThe true value of a quantity is an ideal concept and, in general, cannot be known exactly. 4.2 conventional true value (IEV 301-08-02 modified) a value approximating to the true value of a quantity such that, for the purpose for which that value is used, the difference between the two values can be neglected NOTE 1The conventional true value of a quantity is generally determined by means of methods and by the use of instruments of an accuracy suitable for each particular ca
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