BS-QC-420100-1992 IEC-61051-2-1992.pdf
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1、BRITISH STANDARD BS QC 420100:1992 IEC 1051-2: 1992 Harmonized system of quality assessment for electric components Varistors for use in electronic equipment Sectional specification for surge suppression varistors Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09
2、01:23:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS QC 420100:1992 This British Standard, having been prepared under the direction of the Electronic Components Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 July 1992 BSI 03-2000 Th
3、e following BSI references relate to the work on this standard: Committee reference ECL/4 Announced in BSI News May 1992 ISBN 0 580 21011 1 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Electronic Components Standards Policy Committee
4、(ECL/-) to Technical Committee ECL/4, upon which the following bodies were represented: EEA (The Association of the Electronics, Telecommunications and Business Equipment Industries) Electronic Components Industry Federation Ministry of Defence National Supervising Inspectorate The following bodies
5、were also represented in the drafting of the standard, through subcommittees and panels: BEAMA Ltd. ERA Technology Ltd. Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 01:23:26 GMT+00:00 2006, Uncontrolled
6、 Copy, (c) BSI BS QC 420100:1992 BSI 03-2000i Contents Page Committees responsibleInside front cover National forewordii Section 1. General 1.1Scope1 1.2Object1 1.3Related documents1 1.4Information to be given in a detail specification1 Section 2. Preferred ratings, characteristics and test severiti
7、es 2.1Preferred characteristics2 2.2Derating curves3 2.3Preferred test severities3 Section 3. Quality assessment procedures 3.1Structurally Similar Components4 3.2Qualification Approval4 3.3Quality Conformance Inspection9 Table I Test schedule for Qualification Approval5 Table IIA10 Table IIB10 List
8、 of referencesInside back cover Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 01:23:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS QC 420100:1992 ii BSI 03-2000 National foreword This British Standard has been prepared under the direction of the Electronic C
9、omponents Standards Policy Committee. It is identical with IEC 1051-2:1991 (QC 420100) Varistors for use in electronic equipment Part 2: Sectional specification for surge suppression varistors, published by the International Electrotechnical Commission (IEC) and is a harmonized specification within
10、the IECQ system of quality assessment for electronic components. The standard is to be used in conjunction with BS QC 420000:1992 Varistors for use in electronic equipment: Generic specification. The British Standard which implements the IECQ Rules of Procedure is BS 9000 General requirements for a
11、system for electronic components of assessed quality Part 3:1991 Specification for the national implementation of the IECQ system. Cross-references International StandardCorresponding British Standard IEC 1051-1:1990 (QC 420000) BS QC 420000:1992 Varistors for use in electronic equipment: Generic sp
12、ecification (Identical) IEC 68BS 2011 Environmental testing procedures IEC 68-1:1988Part 1.1:1989 General and guidance (Identical) IEC 68-2-1:1974Part 2.1A:1990 Test A. Cold (Technically equivalent) IEC 68-2-2:1974Part 2.1B:1977 Test B. Dry heat (Identical) IEC 68-2-3:1969Part 2.1Ca:1977 Test Ca. Da
13、mp heat, steady state (Identical) IEC 68-2-6:1982Part 2.1Fc:1983 Test Fc. Vibration (sinusoidal) (Identical) IEC 68-2-13:1983Part 2.1M:1984 Test M. Low air pressure (Identical) IEC 68-2-14:1974Part 2.1N:1985 Test N. Change of temperature (Identical) IEC 68-2-20:1979Part 2.1T:1981 Test T. Soldering (
14、Identical) IEC 68-2-21:1983Part 2.1U:1984 Test U. Robustness of terminations and integral mounting devices (Identical) IEC 68-2-27:197Part 2.1Ea:1977 Test Ea. Shock (Identical) IEC 68-2-30:1969Part 2.1Db:1981 Test Db and guidance: Damp heat, cyclic (12 + 12 house cycle) (Technically equivalent) BS 6
15、001 Specification for sampling procedures for inspection by attributes Part 1:1991 Specification for sampling plans indexed by acceptable quality level (AQL) for lot-by-lot inspection (Technically equivalent) QC 001002:1986BS QC 001002:1991 Rules of Procedure of the IEC Quality Assessment System for
16、 Electronic Components (IECQ) (Identical) Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 01:23:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS QC 420100:1992 BSI 03-2000iii A British Standard does not purport to include all the necessary provisions of a contra
17、ct. 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 to iv, pages 1 to 10, an inside back cove
18、r 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: London South Bank University, London South Bank University, Sat Dec 09 01:23:26 GMT+00:00 2006, Un
19、controlled Copy, (c) BSI iv blank Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 01:23:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS QC 420100:1992 BSI 03-20001 Section 1. General 1.1 Scope This standard is applicable to surge suppression varistors intended
20、to protect electronic and other sensitive equipment from surges, operating from a d.c. supply, or an a.c. supply having a frequency not greater than 400 Hz. Varistors which are the subject of this sectional specification are not intended to give primary protection against lightning surges. 1.2 Objec
21、t The object of this standard is to prescribe preferred ratings and characteristics and to select from IEC Publication 1051-1, the appropriate quality assessment procedures, tests and measuring methods and to give general performance requirements for this type of varistor. Test severities and requir
22、ements prescribed in detail specifications referring to this sectional specification shall be of equal or higher performance level, because lower performance levels are not permitted. 1.3 Related documents 1.4 Information to be given in a detail specification Detail specifications shall be derived f
23、rom the relevant blank detail specification. Detail specifications shall not specify requirements inferior to those of the generic, sectional specification or blank detail specification. When more severe requirements are included, they shall be listed in Sub-clause 1.8 of the detail specification an
24、d indicated in the test schedules, for example by an asterisk. NOTEThe information given in the Sub-clauses 1.4.1 and 1.4.3 may, for convenience, be presented in tabular form. The following information shall be given in each detail specification and the values quoted shall preferably be selected fro
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