1、BRITISH STANDARD BS QC 400200:1993 IEC 115-4: 1982 QC 400200: 1982 Incorporating Amendment No. 1 Harmonized system ofquality assessment for electronic components Fixed resistors for use in electronic equipment Sectional specification: Fixed power resistors IEC title. Fixed resistors for use in elect
2、ronic equipment Part 4: Sectional specification: Fixed power resistors UDC 621.316.8:621.38BSQC400200:1993 This BritishStandard, having been prepared under the directionof the Electronic Components Standards Committee, was published underthe authority of the BoardofBSI and comes into effect on 31Oct
3、ober1983 BSI04-2000 The following BSI references relate to the work on this standard: Committee reference ECL/4 Draft for comment79/33206 DC ISBN 0 580 13414 8 Committees responsible for this BritishStandard The preparation of this BritishStandard was entrusted by the Electronic Components Standards
4、 Committee (ECL/-) to Technical Committee ECL/4 upon which the following bodies were represented: British Telecommunications Electronic Components Industry Federation Electronic Engineering Association Ministry of Defence National Supervising Inspectorate Society of British Aerospace Companies Limit
5、ed Telecommunication Engineering and Manufacturing Association (TEMA) Amendments issued since publication Amd. No. Date of issue Comments 7966 December 1993 Indicated by a sideline in the marginBSQC400200:1993 BSI 04-2000 i Contents Page Committees responsible Inside front cover National foreword ii
6、 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 Section 2. Preferred ratings, characteristics and test severities 2.1 Preferred characteristics 2 2.2 Preferred values of ratings 3 2.3 Preferred test severities 4 Section 3.
7、Quality assessment procedures 3.1 Structurally similar components 6 3.2 Qualification approval 6 3.3 Quality conformance inspection 11 Table I 3 Table II 3 Table III Test schedule for Qualification Approval 7 Table IV A 12 Table IV B 12 Publications referred to Inside back coverBSQC400200:1993 ii BS
8、I 04-2000 National foreword This Part of this BritishStandard has been prepared under the direction of the Electronic Components Standards Committee. It is identical with IEC Publication115-4 QC400200 “Fixed resistors for use in electronic equipment. Part4: Sectional specification: Fixed power resis
9、tors”, published in1982 and Amendment1 published in1933 by the International 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
10、been approved as suitable for publication as a BritishStandard without deviation. Some terminology and certain conventions are not identical with those used in BritishStandards; attention is especially drawn to the following. For the purposes of this Part of BS QC400200 1.1 and 1.2 should be regarde
11、d as constituting the scope of the standard. Cross references The BritishStandard harmonized with QC001001 and QC001002 is BS9000 “General requirements for a system for electronic components of assessed quality” Part1:1981 “Specification of basic rules and procedures”. A British Standard does not pu
12、rport 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. International Standard Corresponding BritishStandard ISO3:1973 BS2045:1
13、965 Preferred numbers (Technically equivalent) IEC63:1963 BS2488:1966 Schedule of preferred numbers for the resistance of resistors and the capacitance of capacitors for telecommunication equipment (Technically equivalent) IEC68 BS2011 Basic environmental testing procedures IEC68-1:1982 Part1.1:1983
14、 General and guidance (Identical) IEC115-1:1982 (QC400000:1982) BS9940 Fixed capacitors for use in electronic equipment Part0:1983 Generic specification (Identical) IEC410:1973 BS6001:1972 Sampling procedures and tables for inspection by attributes (Technically equivalent) Summary of pages This docu
15、ment comprises a front cover, an inside front cover, pagesi andii, pages1 to12, 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.BSQC400200:1993
16、 BSI 04-2000 1 Section 1. General 1.1 Scope This standard relates to fixed power resistors with rated dissipations greater than1W up to and including1000W which are provided with a cover or coating for environmental protection. 1.2 Object The object of this standard is to prescribe preferred ratings
17、 and characteristics and to select from IECPublication115-1:1982, the appropriate quality assessment procedures, tests and measuring methods and to give general performance requirements for this type of resistor. Test severities and requirements prescribed in detail specifications referring to this
18、sectional specification shall be of equal or higher performance level, because lower performance levels are not permitted. 1.3 Related documents NOTEThe above references apply to the current editions except for IEC Publication68 for which the referenced edition in the applicable test clauses of the
19、generic specification shall be used. 1.4 Information to be given in a detail specification Detail specifications shall be derived from the relevant blank detail specification. Detail specifications shall not specify requirements inferior to those of the generic, sectional or blank detail specificati
20、on. When more severe requirements are included, they shall be listed in Sub-clause1.8 of the detail specification and indicated in the test schedules, for example by an asterisk. NOTEThe information given in Sub-clauses1.4.1 and1.4.3 may, for convenience, be presented in tabular form. The following
21、information shall be given in each detail specification and the values quoted shall preferably 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 resistor as an aid to easy recognition and
22、 for comparison of the resistor with others. Dimensions and their associated tolerances, which 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 c
23、onverted metric dimensions in millimetres shall be added. Normally the numerical values shall be given for the length of the body, the width and height of the body and the wire spacing, or for cylindrical types, the body diameter, and the length and diameter of the terminations. When necessary, for
24、example when in a detail specification more than one dissipation value is covered, the dimensions and their associated tolerances shall be presented in tabular form below the drawing. IEC Publications Publication63:1963: Preferred Number Series for Resistors and Capacitors. Amendment No.1(1967). Ame
25、ndment No.2(1977). Publication68: Basic Environmental Testing Procedures. Publication115-1:1982: Fixed Resistors for Use in Electronic Equipment. Part1: Generic Specification. Publication410:1973: Sampling Plans and Procedures for Inspection by Attributes. Publication QC001001:1981: Basic Rules of t
26、he IEC Quality Assessment System for Electronic Components (IECQ). Publication QC001002:1981: Rules of Procedure of the IEC Quality Assessment System for Electronic Components (IECQ).BSQC400200:1993 2 BSI 04-2000 When the configuration is other than described above, the detail specification shall st
27、ate such dimensional information as will adequately describe the resistor. When the resistor is not designed for use on printed boards, this shall be clearly stated in the detail specification. 1.4.2 Mounting The detail specification shall specify the method of mounting to be applied for normal use
28、and for the application of the vibration and the bump or shock tests. The resistors shall be mounted by their normal means. The design of the resistor may be such that special mounting fixtures are required in its use. In this case, the detail specification shall describe the mounting fixtures and t
29、hey shall be used in the application of the vibration and bump or shock tests. 1.4.3 Style (IEC Publication115-1, Sub-clause2.2.3) 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
30、by 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
31、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 SeeSub-clause2.2.1. The preferred values are those of the E-series of IEC Publication63. NOTEWhen products approved to the d
32、etail specification may 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 resistor and on the package. Deviation
33、s from Sub-clause2.4 of the Generic Specification, IEC Publication115-1, shall be specifically stated. 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 Pref
34、erred climatic categories The resistors covered by this specification are classified into climatic categories according to the general rules given in IEC Publication68-1. The lower and upper category temperature and the duration of the damp heat, steady-state test shall be chosen from the following:
35、 The severities for the cold and dry heat tests are the lower and upper category temperatures respectively. Because of the construction of some resistors, these temperatures will occur between two of the preferred temperatures given in IEC Publication68-2. In this event the nearest preferred tempera
36、ture within the actual temperature range of the resistor shall be chosen for this severity. 2.1.2 Temperature coefficients and temperature characteristics of resistance The preferred limits of change in resistance for the temperature characteristic of the resistance test are given in Table I. Each l
37、ine in the table gives the preferred temperature coefficient and corresponding temperature characteristic for20 C to70 C and limits of change in resistance for the measurement of the temperature characteristic of resistance (seeIEC Publication115-1, Sub-clause4.8) on the basis of the category temper
38、ature ranges of Sub-clause2.1.1 of this sectional specification. Lower category temperature: 55 C,40 C,25 C and10 C Upper category temperature: +125 C,+155 C and+200 C Duration of the damp heat, steady-state test:4,10,21 and56daysBSQC400200:1993 BSI 04-2000 3 Table I 2.1.3 Limits for change in resis
39、tance For each stability class, the preferred limits for change in resistance for each of the tests listed in the heading of Table II are as indicated. NOTEThe sub-clause numbers in the heading of Table II refer to IEC Publication115-1. Table II 2.2 Preferred values of ratings 2.2.1 Rated resistance
40、 SeeIEC Publication115-1, Sub-clause2.2.7. 2.2.2 Tolerances on rated resistance The preferred tolerances on rated resistance are: 10%, 5%, 2% and1%. 2.2.3 Rated dissipation The preferred values of rated dissipation, at70 C, are values from the R5 series of ISO Standard3. The detail specification sha
41、ll prescribe the applicable value or range of values. Temperature coefficient Temperature characteristic 20/70 C Temperature characteristic of resistance (limits of percentage change in resistance) Reference temperature/lower category temperature Reference temperature/upper category temperature (10
42、6 / C) (%) +20/55 +20/40 +20/25 +20/10 +20/+125 +20/+155 +20/+200 500 2.5 3.75 3.0 2.25 1.5 5.25 6.75 9.0 250 1.25 1.88 1.5 1.13 0.75 2.62 3.38 4.5 50/ +250 0.25/ +1.25 0.375/ +1.88 0.3/ +1.5 0.23/ +1.13 0.15/ +0.75 0.525/ +2.62 0.675/ +3.38 0.9/+4.5 100 0.50 0.75 0.6 0.45 0.3 1.05 1.35 1.8 50 0.25
43、0.375 0.3 0.23 0.15 0.525 0.675 0.9 25 0.125 0.188 0.15 0.113 0.075 0.262 0.338 0.45 10 0.05 0.075 0.06 0.045 0.03 0.105 0.135 0.18 NOTEIf measurements are required at additional temperatures, these shall be specified in the detail specification. Stability class in % Long-term tests Short-term tests
44、 4.23 4.24 4.25.2 4.25.3 Climatic sequence Damp heat, steady state Endurance at room temperature Endurance at upper category temperature 4.13 4.16 4.18 4.19 4.20 4.21 4.22 Overload Robustness of terminations Resistance to soldering heat Rapid change of temperature Bump Shock Vibration 5 2 1 0.5 (5%+
45、0.17) (2%+0.17) (1%+0.057) (0.5%+0.057) (1%+0.057) (0.5%+0.057) (0.25%+0.057) (0.1%+0.017)BSQC400200:1993 4 BSI 04-2000 The derated values of dissipation at temperatures in excess of70 C shall be as indicated by the following curve: A larger area of operation may be given in the detail specification
46、 provided it includes all the area given above. In this event, the detail specification shall state the maximum allowable dissipation at temperatures other than70 C. All break points on the curve shall be verified by test. An example of a derating curve having a larger area of operation is given bel
47、ow. In the example, the maximum surface temperature (zero rating temperature) is higher than the upper category temperature. 2.2.4 Limiting element voltage The preferred values of limiting element voltage in V d.c. or a.c. r.m.s. shall be chosen from the R5 series of ISO Standard3. 2.2.5 Insulation
48、resistance (Only applicable for types with mounting devices and described as insulated) Unless otherwise specified in the detail specification, the insulation resistance shall be not less than1G7 after dry heat tests and100M7 after humidity tests. 2.2.6 Isolation voltage (Insulated styles only) Unle
49、ss otherwise specified in the detail specification, the isolation voltage shall never be less than the peak voltage that could be applied to the element; it shall, therefore, be not less than1.42times the limiting element voltage. 2.3 Preferred test severities Test severities given in detail specifications shall preferably be selected from the following: 2.3.1 Drying Procedure I of IEC Publication115-1, Sub-claus
