1、BRITISH STANDARD BS CECC 40302:1978 Specification for Harmonized system of quality assessment for electronic components Blank detail specification Fixed precision resistors (Assessment level F)BSCECC40302:1978 BSI 10-1999 ISBN 0 580 35646 9 Amendments issued since publication Amd. No. Date CommentsB
2、SCECC40302:1978 BSI 10-1999 i Contents Page National foreword ii Foreword iii Text of CECC 40302 1BSCECC40302:1978 ii BSI 10-1999 National Foreword This British Standard has been prepared under the direction of the Electronic Components Standards Committee. It is identical with CENELEC Electronic Co
3、mponents Committee CECC 40302 “Blank detail specification: Fixed precision resistors (Assessment level F)”. This standard is a harmonized specification within the CECC system. Terminology and conventions. The text of the CECC specification has been approved as suitable for publication, without devia
4、tion, as a British Standard. 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 used throughout as a decimal marker. In British Standards it is current practice to use a full point on th
5、e baseline as the decimal marker. Cross references. The British Standard harmonized with CECC 00100 is BSE9000 “General requirements for electronic components of assessed quality harmonized with the CENELEC Electronic Component Committee System” Part1“Basic rules”. The following International Standa
6、rds are referred to in the text and for each there is a corresponding British Standard; these are as listed below: Scope. This standard lists the ratings, characteristics and inspection requirements which shall be included as mandatory requirements in accordance with BS E9113 (CECC 40300). Detail sp
7、ecification layout. In the event of conflict between the requirements of this specification and the provisions of BSE9000, the latter shall take precedence except the front page layout will be in accordance with BS9000 Circular Letter No 15 dated August 1977. A British Standard does not purport to i
8、nclude 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 British Standard CECC 40000:1973 BS E9110:19
9、74 Harmonized system of quality assessment for electronic components: Generic specification for fixed resistors (Identical) CECC 40300:1974 BS E9113:1973 Harmonized system of quality assessment for electronic components: Sectional specification for fixed precision resistors (Identical). Summary of p
10、ages This document comprises a front cover, an inside front cover, pages i and ii, the CECC title page, pages ii to iv, pages 1 to 7 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 in
11、side front cover.BSCECC40302:1976 ii BSI 10-1999 Contents Page Foreword iii 1 Ratings and characteristics 1 1.1 Derating 1 2 Marking 1 3 Related documents 1 4 Ordering information 2 5 Certified test records 2 6 Inspection requirements 2 Table 1 iv Table 2 3BSCECC40302:1976 BSI 10-1999 iii Foreword T
12、he 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 assessed quality. The object of the System is to facilitate inter
13、national trade by the harmonization of specifications and quality assessment procedures for electronic components, and by the grant of an internationally recognized Mark, or Certificate, of Conformity. The components produced under the System are thereby accepted by all member countries without furt
14、her 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 prepare and issue detail specifications for FIXED PRECISION RESISTORS (ASSESSMENT LEVEL F). It should be read in conjunction with document CECC 001
15、00: Basic Rules (1974). At the date of printing of this document the member countries of the CECC are Belgium, Denmark, Germany, France, Ireland, Italy, the Netherlands, Norway, Sweden, Switzerland and the United Kingdom, and copies of it can be obtained from the National Committees of the CENELEC i
16、n these countries. Preface This blank detail specification was prepared by CECC Working Group4:“Resistors”. It is one of a series of blank detail specifications for fixed precision resistors, all relating to the generic specification printed as CECC40000 and the sectional specification printed as CE
17、CC40300. The text of this specification has been prepared from the information contained in CECC40000 and CECC40300. It was circulated to the CECC for voting in the documents listed below and was formally approved by the CECC for publication as a CECC Specification. The numbers between square bracke
18、ts on page iv correspond to the following indications which should be given: Document Voting date CECC(Secretariat) 60 10 January 1972 CECC(Secretariat) 83 30 June 1972 CECC(Secretariat)343 18 June 1975 Identification of the harmonized detail specification 1 The name of National Standards Organizati
19、on under whose authority the detail specification is drafted. 2 The CECC Symbol and the number allotted by the CECC General Secretary to the completed detail specification. 3 The number and issue number of the national generic specification. 4 The national number of the detail specification, date of
20、 issue and any further information required by the national system.BSCECC40302:1976 iv BSI 10-1999 Table 1 Identification of the resistor 5 A short description of the type of resistor. 6 Information on typical construction (where applicable) for example: wirewound insulated. 7 Outline drawing with m
21、ain dimensions which are of importance for interchangeability and/or reference to the national or international documents for outlines. Alternatively, this drawing may be given in an appendix to the detail specification. 8 Application or group of applications covered, or, preferably, the level of qu
22、ality assessment covered by the blank detail specification. 9 Reference data on the most important properties, to allow comparison between the various resistor types. Page: of: 1 CECC 40302 2 Specification available from: 3 4 ELECTRONIC COMPONENT OF ASSESSED QUALITY IN ACCORDANCE WITH: Outline and d
23、imensions:(See Table 1) (First angle projection) 7 FIXED PRECISION RESISTORS (Assessment Level F) 5 6 8 NOTE 1Other shapes are permitted within the dimensions given. NOTE 2These resistors are (not) suitable for printed wiring applications. 9 Style Rated dissipation (W at 70 C) Limiting element volta
24、ge (V d.c. or a.c. peak) Isolation voltage (V d.c. or a.c. peak) Maximum dimensions d L D min nom max All dimensions are in millimetres.BSCECC40302:1976 BSI 10-1999 1 1 Ratings and characteristics 1.1 Derating Resisters covered by this specification are derated according to the curve: 2 Marking The
25、marking of the component and package shall be in accordance with the requirements of2.4 of CECC40000. 3 Related documents National Authorized Institutions shall complete this section, making reference to any documents, recommendations or specifications directly referred to in their national equivale
26、nt of this document. 1) Resistance range 7 to 7 Standard selection tolerances . % Climatic category -/-/- Vibration severity . Hzto. Hz; 0,75 mm or 98 m/s 2(whichever is the less severe) Low air pressure 8,5 kN/m 2 (85 mbar) 1) The preferred values are those of the E-series of IEC 63. Where the use
27、of intermediate values is essential, they should, wherever possible, be chosen from a series in that document. See the relevant Qualified Products List for the availability of components qualified to this detail specification. Limit of resistance change after 1000 h endurance test ( % + 7) Temperatu
28、re characteristic of resistance (20 to 70 C) % R/R: k .% (% R/R %T: k . 10 6 / C)BSCECC40302:1976 2 BSI 10-1999 4 Ordering information Orders for resisters covered by this specification shall contain the following information: resistance value tolerance style and national specification number of thi
29、s detail specification. 5 Certified test records National Authorized Institutions shall indicate in this paragraph whether certified test records shall be prepared in accordance with 3.5 of CECC40000. 6 Inspection requirements (SeeTable 2) 6.1 When drying is called for, Procedure I of 4.2 of CECC400
30、00 shall be used. 6.2 When it is desired to obtain qualification approval by adopting the fixed sample size procedure, use shall be made of the test schedule given for that purpose in CECC40300. The conditions of test and the performance requirements shall be identical to those prescribed for qualit
31、y conformance inspection in the detail specification.BSCECC40302:1976 BSI 10-1999 3 Table 2 Clause Number and Test (SeeNote1) D or ND Conditions of test IL AQL Performance requirements (SeeNote 1) (See Note 2) GROUP A INSPECTION To be conducted on a sampling basis, lot-by-lot Sub-Group A1 ND II 1,0%
32、 4.3.1 Visual examination As in 4.3.1 4.3.3 Dimensions (gauging) As specified in the detail specification. 4.3.2 Marking As in 4.3.2 Sub-Group A2 ND II 0,25% 4.4 Resistance See CECC 40000 Appendix D3.1 As in 4.4.2 GROUP B INSPECTION To be conducted on a sampling basis, lot-by-lot Sub-Group B1 D S-3
33、1,0% 4.6 Voltage proof Insulated resistors only As in 4.6.3 4.5 Insulation resistance Insulated resistors only R: U - - - M 7 or- - - G g7 4.15.1 Soldering - Solderability (The detail specification shall indicate whether the terminations are suitable for printed wiring) As in 4.15.1 The terminations
34、 shall be uniformly tinned. 4.11 Overload Test duration Rated dissipation 1 s 5 s 15 s 0,063 W 0,125 to 0,75 W 1 to 2 W Voltage: The applied voltage shall be 2,5 times the rated voltage or twice the limiting element voltage, whichever is the less. Visual examination Resistance As in 4.11.3 % R/R: k
35、% Sub-Group B2 ND S-3 2,5% 4.7 Temperature characteristic of resistance One cycle of 20 C to 70 C to20 C only. % R/R: k .% Notes on page 7.BSCECC40302:1976 4 BSI 10-1999Table 2 Clause Number and Test (SeeNote1) D or ND Conditions of test Sample size & criterion of acceptability (See Note 3) Performa
36、nce requirements (See Note 1) p n c GROUP C INSPECTION Not applicable GROUP D INSPECTION To be conducted on a sampling basis at the periodicity given in column “P” Sub-Group D1 D 6 13 1 4.14 Robustness of terminations i) 7 specimens Tensile, bending and torsion tests. Visual examination Resistance A
37、s in 4.14.6.1 % R/R:k.% 4.15.2 Soldering Resistance to heat (The detail specification shall indicate whether Method 1A or Method 1B of Test Tb of IEC68-2-20A shall apply). Visual examination Resistance As in 4.15.2.4 % R/R: k .% ii) Remaining 6 specimens 4.16 Rapid change of temperature T A: Lower c
38、ategory temperature T B:Upper category temperature Visual examination Resistance As in 4.16.4 % R/R: k .% 4.19 Vibration Procedure: B4 IEC 68-2-6 Frequency range:. Hz to.Hz Amplitude: 0,75 mm or 98 m/s 2(whichever is the less severe). Sweep endurance: Total duration: 6 h (See Note 4) Visual examinat
39、ion Resistance As in 4.19.3 % R/R: k .% Notes on page 7.BSCECC40302:1976 BSI 10-1999 5Table 2 Clause Number and Test (See Note 1) D or ND Conditions of test Sample size & criterion of acceptability (See Note 3) Performance requirements (See Note 1) P n c Sub-Group D1 All of the sample 4.20 Climatic
40、sequence Dry heat, Damp heat, cyclic, first cycle Cold Low air pressure 8,5 kN/m 2(85 mbar) Damp heat, cyclic, remaining cycles Final measurements Visual examination Resistance As in 4.20.8 % R/R: k .% Insulation resistance (insulated resistors only) R: U. M 7 orG 7 Sub-Group D2 D 6 13 1 4.24.1 Endu
41、rance at 70 C Duration: 1 000 h Examination at 48, 168, 500 and 1000 h. Visual examination Resistance As in 4.24.1.7 % R/R: k.% Examination at 1 000 h Insulation resistance (insulated resistors only) R: U.M 7 orG 7 Sub-Group D3 D 12 13 1 4.21 Damp heat, steady state Visual examination Resistance Ins
42、ulation resistance (insulated resistors only) As in 4.21.4 % R/R: k.% R: U.M 7 orG 7 Notes on page 7.BSCECC40302:1976 6 BSI 10-1999Table 2 Clause Number and Test (See Note 1) D or ND Conditions of test Sample size & criterion of acceptability (See Note 3) Performance requirements (See Note 1) P n c
43、Sub-Group D4 ND 12 13 1 LCT/20 20/UCT 4.7 Temperature characteristic or resistance % R/R: k .% .% Sub-Group D5 D 24 13 1 4.3.4 Dimensions (detail) As specified in the detail specification 4.24.3 Endurance at upper category temperature Duration: 1 000 h Examination at 48, 168, 500 and 1 000 h. Visual
44、 examination Resistance Examination at 1 000 h Insulation resistance (insulated resisters only) As in 4.24.3.7 % R/R: k .% R: U.M 7 orG 7 Sub-Group D6 D 24 13 1 4.24 Endurance at other temperatures (where applicable) This sub-group is only applicable if a derating curve other than that shown in 2.4
45、of CECC40300, is claimed in the detail specification. Duration: 1000 h Examination at 48, 168, 500 and 1000 h. Visual examination Resistance As in 4.24.1.7 % R/R: k.% (As for Sub-Group D2) Examination at 1 000 h Insulation resistance (insulated resistors only) R: U. M 7 orG 7 Notes on page 7.BSCECC4
46、0302:1976 BSI 10-1999 7 NOTE 1Clause numbers of tests and performance requirements refer to CECC 40000. NOTE 2Inspection Levels and AQLs are selected from IEC410. NOTE 4Resistors shall be mounted by their normal means. Where this is by axial wire terminations, the distance between the resistor body
47、and the mounting point on the termination shall be6 1mm. The design of a 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 they shall be used in the performance of bump, shock and vibration tes
48、ts. NOTE 3In this table: p = periodicity (in months) n = sample size c = acceptance criterion (permitted number of defectives) D = destructive ND = non-destructive LCT = Lower category temperature UCT = Upper category temperatureBS CECC 40302:1978 BSI 389 Chiswick High Road London W4 4AL BSIBritishS
49、tandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions BritishStandards are updated by amendment or revision. Users of BritishStandards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone fi
