1、BRITISH STANDARD BS 9940-05.00: 1985 IEC 115-7: 1984 QC 400500: 1984 Harmonized system ofquality assessment for electronic components Fixed resistors for use in electronic equipment Part 05.00: Sectional specification: Fixed resistor networks in which not all resistors are individually measurable IE
2、C Title. Fixed resistors for use in electronic equipment Part 7: Sectional specification: Fixed resistor networks in which not all resistors are individually measurable UDC 621.316.8:621.38BS9940-05.00:1985 This British Standard, having been prepared under the directionof the Electronic Components S
3、tandards Committee, was published under the authority of the Boardof BSIand comes into effecton 29November 1985 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference ECL/4 Draft for comment 79/21626 DC ISBN 0 580 14725 8 Committees responsible for this Bri
4、tish Standard The preparation of this British Standard was entrusted by the Electronic Components Standards Committee (ECL/-) to Technical Committee ECL/4 upon which the following bodies were represented: British Telecommunications plc Electronic Components Industry Federation Electronic Engineering
5、 Association Ministry of Defence National Supervising Inspectorate Society of British Aerospace Companies Limited Telecommunication Engineering and Manufacturing Association (TEMA) Amendments issued since publication Amd. No. Date of issue CommentsBS9940-05.00:1985 BSI 01-2000 i Contents Page Commit
6、tees responsible Inside front cover National foreword ii Section 1. General 1.1 Scope 1 1.2 Object 1 1.3 Related documents 1 1.4 Information to be given in a detail specification 1 1.5 Marking 2 1.6 Terminology 2 Section 2. Preferred ratings, characteristics and test severities 2.1 Preferred charact
7、eristics 5 2.2 Preferred values of ratings 6 2.3 Preferred test severities 7 Section 3. Quality assessment procedures 3.1 Structurally Similar Components 9 3.2 Qualification Approval 9 3.3 Quality Conformance Inspection 16 Table I 5 Table Ia 5 Table II 6 Table A 10 Table III Test schedule for Qualif
8、ication Approval 11 Table IIIa Test schedule for Qualification approval (Additional tests for aggregated networks) 15 Table IV A 17 Table IV B 17 Publications referred to Inside back coverBS9940-05.00:1985 ii BSI 01-2000 National foreword This Part of BS 9940 has been prepared under the direction of
9、 the Electronic Components Standards Committee. It is identical with IEC Publication 115-7 (QC 400500):1984 “Fixed resistors for use in electronic equipment. Part 7: Sectional specification: Fixed resistor networks in which not all resistors are individually measurable” published by the Internationa
10、l Electrotechnical Commission (IEC). This standard is a harmonized specification within the IECQ system of quality assessment for electronic components. Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without dev
11、iation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. For the purposes of this Part of BS 9940 1.1 and 1.2 should be regarded as constituting the scope of the standard. Cross-references. The British St
12、andard harmonized with QC 001001 and QC001002 is BS 9000 “General requirements for a system for electronic components of assessed quality Part 1:1981 Specification of basic rules and procedures”. A British Standard does not purport to include all the necessary provisions of a contract. Users of Brit
13、ish Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. International Standards Corresponding British Standards IEC 63:1963 BS 2488:1966 Schedule of preferred numbers for the resistance of resistors an
14、d the capacitance of capacitors for telecommunication equipment (Technically equivalent) IEC 68 BS 2011 Basic environmental testing procedures IEC 68-1:1982 Part 1.1:1983 General and guidance (Identical) IEC 115-1:1982 (QC 400000:1982) BS 9940 Fixed resistors for use in electronic equipment Part 0:1
15、983 Generic specification (Identical) IEC 115-7-1:1984 (QC 400501:1984) BS 9940 Fixed resistors for use in electronic equipment Part 05.01:1985 Blank detail specification: Fixed resistor networks in which not all resistors are individually measurable. Assessment level E (Identical) IEC 410:1973 BS 6
16、001:1972 Sampling procedures and tables for inspection by attributes (Technically equivalent) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 to 18, an inside back cover and a back cover. This standard has been updated (see copyright date) and ma
17、y have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS9940-05.00:1985 BSI 01-2000 1 Section 1. General 1.1 Scope This standard applies to fixed resistor networks. The resistors may be individually isolated or interconnected in any circuit confi
18、guration. 1.2 Object The object of this standard is to prescribe preferred ratings and characteristics and to select from IEC Publication 115-1:1982, the appropriate Quality Assessment procedures, tests and measuring methods and to give general performance requirements for this type of resistor netw
19、ork. Test severities and requirements 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 IEC publications: 1.4 Information to be given in a detail speci
20、fication Detail specifications shall be derived from the relevant blank detail specification. Detail specifications shall not specify requirements inferior to those of the Generic or Sectional Specification. When more severe requirements are included, they shall be listed in Sub-clause 1.8 of the de
21、tail specification and indicated in the test schedules, for example by an asterisk. NOTEThe information given in 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 preferabl
22、y be selected from those given in the appropriate clause of this sectional specification. 1.4.1 Outline drawing and dimensions There shall be an illustration of the network as an aid to easy recognition and for comparison of the network with others. Dimensions and their associated tolerances, which
23、affect interchangeability and mounting, shall be given in the detail specification. All dimensions shall preferably be stated in millimetres, however when the original dimensions are given in inches, the converted metric dimensions in millimetres shall be added. 1.4.2 Mounting The detail specificati
24、on shall specify the method of mounting to be applied for normal use and for the application of the vibration and the bump or shock tests. The resistor networks shall be mounted by their normal means. The design of the resistor network may be such that special mounting fixtures are required in its u
25、se. In this case, the detail specification shall describe the mounting fixtures and they shall be used in the application of the vibration and bump or shock tests. Publication 63:1963 Preferred Number Series for Resistors and Capacitors. Amendment No. 1 (1967) Amendment No. 2 (1977) Publication 68:
26、Basic Environmental Testing Procedures. Publication 115-1:1982 Fixed Resistors for Use in Electronic Equipment. Part 1: Generic Specification. Publication 410:1973 Sampling Plans and Procedures for Inspection by Attributes. Publication QC 001001:1981 Basic Rules of the IEC Quality Assessment System
27、for Electronic Components (IECQ). Publication QC 001002:1981 Rules of Procedures of the IEC Quality Assessment System for Electronic Components (IECQ). NOTEThe above references apply to the current editions except for IEC Publication 68, for which the referenced edition in the applicable test clause
28、s of the generic specification shall be used.BS9940-05.00:1985 2 BSI 01-2000 1.4.3 Style (IEC Publication 115-1, Sub-clause 2.2.3) For the purpose of this standard the style is a combination of rated dissipation and temperature characteristic (or coefficient) of resistance. It shall be represented b
29、y a double-letter code e.g. AB, BC, CD, etc., which is arbitrarily chosen for each dissipation/temperature characteristic combination covered by a detail specification. The style designation, therefore, has no meaning unless the number of the detail specification is also given. 1.4.4 Ratings and cha
30、racteristics The ratings and characteristics shall be in accordance with the relevant clauses of this specification together with the following: 1.4.4.1 Rated resistance range See Sub-clause 2.2.1. The preferred values are those of the E-series of IEC Publication 63. NOTEWhen products approved to th
31、e detail specification have different ranges, the following statement should be added: “The range of values available in each style is given in the qualified products list”. 1.4.5 Marking The detail specification shall specify the content of the marking on the network and on the package. Deviations
32、from Sub-clause 1.5 of this specification, shall be specifically stated. 1.5 Marking 1.5.1 The information given in the marking is selected from the following list; the relative importance of each item is indicated by its position on the list: 1) Network identification which enables reference back t
33、o the detail specification for identification of each element. 2) The identification of terminations as given in the detail specification. 3) Date of manufacture. 4) Detail specification and style. 5) Manufacturers name or trade mark. 1.5.2 The network shall be clearly marked with 1) and 2) above an
34、d with as many of the remaining items as practicable. Any duplication of information in the marking should be avoided. 1.5.3 The package containing the networks shall be clearly marked with the information listed in 1), 3), 4) and 5) above. 1.5.4 Any additional marking shall be so applied that no co
35、nfusion can arise. 1.6 Terminology In addition to the definitions given in the Generic Specification for Fixed Resistors, IEC Publication 115-1, the following definitions apply: 1.6.1 fixed resistor network a network in which a number of resistive elements are physically inseparably associated, so t
36、hat, in terms of specifications, tests, trade and maintenance, it is considered as indivisible 1.6.2 rated resistance the value of each element of the resistor network which is marked on the network or indicated in the detail specification 1.6.3a differential resistance/temperature characteristic th
37、e difference at a given temperature, between the resistance/temperature characteristics of any two specified resistors of the same network over a given temperature rangeBS9940-05.00:1985 BSI 01-2000 3 Example of calculation: where: 1.6.3b differential temperature coefficient the difference between t
38、he temperature coefficients at a given ambient temperature of any two specified resistors in the same network over a given temperature range: Example of calculation: where: 1.6.4 differential resistance change the difference between the resistance change of any two specified resistors of the same ne
39、twork at the end of a test NOTEIt is normally expressed in per cent. 1.6.5 rated resistor element dissipation the maximum allowable dissipation which a resistor element is capable of dissipating in continuous operation at the rated temperature of 70 C 1.6.6 rated network dissipation The maximum allo
40、wable dissipation which the resistor network is capable of dissipating in continuous operation at the rated temperature of 70 C 1.6.7 resistance ratio the ratio of the resistance values of any two specified resistors of the same network when called for the rated value and the tolerance of this rated
41、 value of the ratio are given by the detail specification 1.6.8 functional characteristics the functions for which the networks have been designed. These functions shall be defined when necessary by the detail specification which will state the methods of measurement, the performance requirements an
42、d the tests before, during and after which these functions shall be measured % (R.T.C.) = The differential resistance/temperature characteristic between the two specified resistors expressed in %. R1 and R2 = The resistance values of each of the two resistors at the reference ambient temperature (no
43、rmally 20 C). % R1 and % R2 = The change in resistance between a given ambient temperature and the reference ambient temperature. Thisgiven ambient temperature shall be within the category temperature range. % (!) = The differential coefficient temperature between the two specified resistors express
44、ed in 10 6 / C. R1 and R2 = The resistance value of each of the two resistors at the reference ambient temperature (normally 20 C). % R1 and % R2 = The change in resistance value, between a given ambient temperature and the reference ambient temperature. This given ambient temperature must be within
45、 a specified range included in the category temperature range. % = The algebraic difference, in degrees Celsius, between the reference and the given ambient temperature.BS9940-05.00:1985 4 BSI 01-2000 1.6.9 qualifying test network a style of network representative of a family of networks which is us
46、ed to check that the design rules used and manufacturing processes applied by a manufacturer of fixed resistor networks enable him to produce networks capable of meeting specified electrical characteristics and performance requirements NOTEThis qualifying test networks might either be an actual fixe
47、d resistor network manufactured for customers use or one designed for the purpose of qualification and/or quality conformance inspection only, provided that the National Supervising Inspectorate considers it to be representative of the family. 1.6.10 limiting element voltage the maximum d.c. or a.c.
48、 r.m.s. voltage that may be continuously applied to the terminations of each resistor in the network (it is generally dependent upon size and manufacturing technology of the resistor network) where the term a.c. r.m.s. voltage is used in this standard, the peak voltage shall not exceed 1.42 times th
49、e r.m.s. value NOTEThis voltage shall only be applied to resistors when the resistance value is equal to or higher than the critical resistance value.BS9940-05.00:1985 BSI 01-2000 5 Section 2. Preferred ratings, characteristics and test severities 2.1 Preferred characteristics The values given in detail specifications shall preferably be selected from the following: 2.1.1 Preferred climatic categories The resistor networks covered by this specification are classified into climatic categories according to the general rules given in IEC Publication 68-
