1、BRITISH STANDARD BS CECC 40300:1981 Harmonized system of quality assessment for electronic components: Sectional specification: Fixed precision resistors UDC 621.316.8BSCECC40300:1981 This British Standard, having been prepared under the directionof the Electronic Components Standards Committee, was
2、 published underthe authority of the Executive Board and comes intoeffect on 31December1981 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference ECL/4 Draft for comment 80/27121 DC ISBN 0 580 12514 9 Cooperating organizations The Electronic Components Sta
3、ndards Committee, under whose direction this British Standard was prepared, consists of representatives from the following: British Electrical and Allied Manufacturers Association (BEAMA) Electricity Supply Industry in England and Wales* Electronic Components Industry Federation* Electronic Engineer
4、ing Association* Institution of Electronic and Radio Engineers National Supervising Inspectorate* Post Office* Society of British Aerospace Companies Limited* Telecommunication Engineering and Manufacturing Association (TEMA) The organizations marked with an asterisk in the above list, together with
5、 the following, were directly represented on the Technical Committee entrusted with the preparation of this British Standard: British Broadcasting Corporation Electrical Research Association Amendments issued since publication Amd. No. Date of issue CommentsBSCECC40300:1981 BSI 09-1999 i Contents Pa
6、ge Cooperating organizations Inside front cover National foreword ii Foreword iii Text of CECC 40300 1 Publications referred to Inside back coverBSCECC40300:1981 ii BSI 09-1999 National foreword This British Standard has been prepared under the direction of the Electronic Components Standards Commit
7、tee. It is identical with CENELEC Electronic Components Committee (CECC)40300 “Harmonized system of quality assessment for electronic components: Sectional specification: Fixed precision resistors” (second edition). This standard is a harmonized specification within the CECC system. Terminology and
8、conventions. The text of the CECC specification has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is especially drawn to the following. The comma has been u
9、sed throughout as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Cross references. The British Standard harmonized with CECC00100 is BSE9000 “Specification for general requirements for electronic components of assessed quality
10、 harmonized with the CENELEC Electronic Components Committee System” Part1 “Basic rules”. A 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 o
11、f itself confer immunity from legal obligations. International Standard Corresponding British Standard CECC 40000:1979 BS CECC 40000:1980 Harmonized system of quality assessment for electronic components: Generic specification: Fixed resistors (Identical) BS 2011 Basic environmental testing procedur
12、es IEC 68-1:1978 Part 1.1:1980 General testing procedures (Identical) IEC 68-2-6:1970 Part 2.1Fc:1977 Test Fc. Vibration (sinusoidal) (Identical) IEC 68-2-13:1966 Part 2.1M:1977 Test M. Low air pressure (Identical) IEC 68-2-20A:1970 Part 2.1Tb:1977 Test Tb. Soldering resistance to soldering heat, Me
13、thod 1 (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theCECC title pages, pages ii to iv, pages 1 to 10, an inside back cover and abackcover. This standard has been updated (see copyright date) and may have had amendments incorporated. Thi
14、s will be indicated in the amendment table on theinside front cover.BSCECC40300:1981 ii BSI 09-1999 Contents Page Foreword iii Section 1. Scope 1 Section 2. Preferred characteristics, ratings and severities for environmental and overload test 1 2.1 Characteristics 1 2.1.1 Climatic severities 1 2.1.2
15、 Temperature characteristics and temperature coefficients of resistance 1 2.1.3 Limits for change in resistance 2 2.1.4 Limits for insulation resistance 2 2.2 Ratings 2 2.2.1 Rated resistance 2 2.2.2 Tolerances on rated resistance 2 2.2.3 Rated dissipation 2 2.2.4 Limiting element voltage 2 2.3 Seve
16、rities for environmental and overload tests 2 2.3.1 Drying 2 2.3.2 Vibration 2 2.3.3 Low air pressure 2 2.3.4 Overload 3 2.4 Derating curve 3 2.5 Information to be given in detail specifications 3 2.5.1 Style 3 2.5.2 Rated dissipation 3 2.5.3 Limiting element voltage 3 2.5.4 Isolation voltage 3 2.5.
17、5 Dimensions 4 2.5.6 Resistance range 4 2.5.7 Tolerances on rated resistance 4 2.5.8 Climatic category 4 2.5.9 Vibration severity 4 2.5.10 Low air pressure severity 4 2.5.11 Limits of resistance change after 1 000 h endurance test 4 2.5.12 Temperature characteristic of resistance 4 2.5.13 Derating c
18、urve 4 2.5.14 Marking 4 2.5.15 Ordering information 4 2.5.16 Additional information (not for inspection purposes) 4 Section 3. Inspection 5 3.1 Formation of inspection lots 5 3.2 Test methods 5 3.3 Qualification Approval 5 Appendix A Fixed sample size qualification approval test schedule for fixed p
19、recision resistors 6BSCECC40300:1981 BSI 09-1999 iii Foreword The CENELEC Electronic Components Committee (CECC) is composed of those member countries of the European Committee for Electrotechnical Standardization (CENELEC) who wish to take part in a harmonized System for electronic components of as
20、sessed quality. The object of the System is to facilitate international trade by the harmonization of the specifications and quality assessment procedures for electronic components, and by the grant of an internationally recognised Mark, or Certificate, of Conformity. The components produced under t
21、he System are thereby accepted by all member countries without further testing. This document has been formally approved by the CECC, and has been prepared for those member countries taking part in the System who wish to issue national harmonized specifications for FIXED PRECISION RESISTORS. It shou
22、ld be read in conjunction with document CECC00100, Basic Rules (1974). At the date of printing of this document the member countries of the CECC are Belgium, Denmark, France, Germany, Ireland, Italy, the Netherlands, Norway, Sweden, Switzerland and the United Kingdom and copies of it can be obtained
23、 from the addresses shown on the inside cover. Preface This specification was prepared by CECC Working Group4: Resistors. In accordance with the requirements of document CECC00100 it is based, wherever possible, on the Recommendations of the International Electrotechnical Commission. The text of the
24、 first issue of this sectional specification (1974) was circulated to the CECC for voting in document CECC (Secretariat)127 in January1973. This second issue of the sectional specification results from amendments or additions to the text of Issue1 which were circulated to the CECC for voting in the
25、documents listed below and was approved by the CECC Management Committee for printing as a CECC specification: Effective dates This second issue of CECC40300 shall become effective for all new qualification approvals on 15June1981. It shall become effective for all other qualification approvals by 1
26、5June1982. Document Date of Vote Report on the Voting CECC(Secretariat)334 27 May 1975 CECC(Secretariat)396 CECC(Secretariat)340 18 June 1975 CECC(Secretariat)402 CECC(Secretariat)949 15 June 1980 CECC(Secretariat)977iv blankBSCECC40300:1981 BSI 09-1999 1 Section 1. Scope This sectional specificatio
27、n prescribes the standard values for characteristics and ratings and also the inspection requirements for fixed precision resistors of assessed quality. It selects from the generic specification, CECC40000, the appropriate methods of test to be used in detail specifications derived from this specifi
28、cation. Associated with this specification are one or more blank detail specifications each referenced by a CECCnumber. A blank detail specification which has been completed as specified in2.5 of this specification forms a detail specification. Such detail specifications may be used for the grant of
29、 Qualification Approval to a resistor and for the performance of Quality Conformance Inspection in accordance with the CECC System. Section 2. Preferred characteristics, ratings and severities for environmental and overload tests 2.1 Characteristics The values given in detail specifications shall pr
30、eferably be selected from the following: 2.1.1 Climatic severities The resistors covered by this document are classified into climatic categories according to the general rules given in the Appendix to IEC68-1. The standard severities for the cold, dry heat and damp heat, steady state, tests are wit
31、hin the following ranges: Values selected within these ranges shall be chosen from those listed in the relevant tests of IEC68-2. The severities for the cold and dry heat tests are the lower and upper category temperatures. For some resistors, these temperatures will occur between two of the preferr
32、ed temperatures given in IEC68-2. In this case, the nearest preferred temperature within the category temperature range of the resistors shall be chosen for this severity. 2.1.2 Temperature characteristics and temperature coefficients of resistance The preferred limits of change in resistance for th
33、e temperature characteristics of resistance test are given in the table (below). Each line in the table below gives the temperature coefficient quoted in parts per million per K and per cent per K and limits of change in resistance for the measurement of temperature characteristic of resistance (4.7
34、 of CECC40000) on the basis of the category temperature ranges of2.1.1 of this document. If measurements are required at additional temperatures these shall be specified in the detail specification. Cold (Test A) 10 to 55 C Dry heat (Test B) + 85 to + 155 C Damp heat, steady state (Test C) 4 to 56 d
35、ays Temperature Coefficients Percentage change in resistance Lower Category Temperature( C) Upper Category Temperature( C) 10 6 /K %/K + 20/ 55 + 20/ 40 + 20/ 25 + 20/ 10 + 20/ + 85 + 20/+ 100 + 20/+ 125 + 20/+ 155 50 0,005 0,375 0,3 0,225 0,15 0,325 0,4 0,525 0,675 25 0,0025 0,188 0,15 0,113 0,075
36、0,162 + 0,2 0,262 0,338 20 0,002 0,15 0,12 0,09 0,06 0,130 0,16 0,210 0,270 15 0,0015 0,112 0,09 0,068 0,045 0,098 0,12 0,158 0,203 10 0,001 0,075 0,06 0,045 0,03 0,065 0,08 0,105 0,135 5 0,0005 0,038 0,03 0,023 0,015 0,033 0,04 0,053 0,068BSCECC40300:1981 2 BSI 09-1999 2.1.3 Limits for change in re
37、sistance The preferred combinations of standard limits for change in resistance in each of the tests listed in the heading of the following tables are as indicated in the line of the table. NOTEThe clause numbers in the headings of the table refer to CECC40000. 2.1.4 Limits for insulation resistance
38、 The standard limits for insulation resistance shall be1 G7 minimum or, after humidity tests, 100M7. 2.2 Ratings The values given in detail specifications shall preferably be selected from the following: 2.2.1 Rated resistance See2.3.2 of CECC40000 2.2.2 Tolerances on rated resistance The standard t
39、olerances on rated resistance are: 1 %; 0,5 %; 0,25 %; 0,1 %; 0,05 %; 0,025 %; and 0,01 % or 10 m7 2.2.3 Rated dissipation The standard values of rated dissipation at70 C are: 0,063; 0,125; 0,25; 0,5; 1 and 2 W. 2.2.4 Limiting element voltage The standard values of limiting element voltage are: 100;
40、 150; 200; 250; 350; 500; 750 and 1 000 V d.c. or a.c. r.m.s. 2.3 Severities for environmental and overload tests Test severities given in detail specifications shall preferably be selected from the following: 2.3.1 Drying Procedure I of 4.2 of CECC40000 shall be used. 2.3.2 Vibration Test Fc (IEC 6
41、8-2-6A) Procedure B4 Resistors shall be mounted by their normal means. Where this is by axial wire terminations, the distance between the resistor body and the mounting point on the termination shall be61mm. 2.3.3 Low air pressure Test M (IEC 68-2-13) 8,5 kPa (85mbar) 4.20 Climatic sequence 4.11 Ove
42、rload 4.21 Damp heat, steady state 4.14 Robustness of terminations 4.24 Endurance 4.15.2 Resistance to soldering heat 4.16 Rapid change of temperature 4.19 Vibration (0,1 % + 0,01 7) (0,05 % + 0,01 7) (0,05 % + 0,01 7) (0,01 % + 0,01 7) Frequency range : 10 Hz to 55 Hz, or 10 Hz to 500 Hz. Amplitude
43、 : 0,75 mm or 98 m/s 2(whichever is the less severe.) Sweep endurance : Total duration: 6 hBSCECC40300:1981 BSI 09-1999 3 2.3.4 Overload 2.4 Derating curve The detail specification shall state the maximum allowable dissipation at temperatures other than70 C. All break points on the curve shall be ve
44、rified by test. 2.5 Information to be given in a detail specification The following 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 document. NOTEThe information given in 2.5.1 to2.5.5 may,
45、for convenience, be presented in tabular form. 2.5.1 Style (2.2.3 of CECC 40000) The style is a combination of rated dissipation and temperature characteristic (or coefficient) of resistance. It shall be represented by a double-letter code e.g. AB, which is arbitrarily chosen for each detail specifi
46、cation. The style designation, therefore, has no meaning unless the number of the detail specification is also given. 2.5.2 Rated dissipation See 2.2.3 2.5.3 Limiting element voltage See 2.2.4 2.5.4 Isolation voltage (insulated styles only) See 2.2.14 of CECC40000. Applied voltage: 2,5 times the rat
47、ed voltage or twice the limiting element voltage, whichever is the less. Duration: Test duration Rated dissipation 1 s 0,063 W 5 s 0,125 to 0,75 W 15 s 1 to 2 WBSCECC40300:1981 4 BSI 09-1999 2.5.5 Dimensions The numerical values, in millimetres, shall be given for such of the following dimensions as
48、 are applicable and it shall be stated which dimensions are suitable for gauging. Separation of radial leads or tab terminations (measured to centre line of termination). Distance from a radial lead or tab termination to the end of the body (measured from the centre line of the termination). NOTETwo
49、 dimensions may be involved. Dimensions of screw holes or wire entry holes should be given in a note. The detail specification shall state such other dimensional information as will adequately describe the resistor. 2.5.6 Resistance range See 2.2.1 NOTEWhere products approved to the detail specification may have different ranges, the following statement should be made: “The range of values available in each style
