1、BRITISH STANDARD BS CECC 41200:1979 Harmonized system of quality assurance for electronic components: Sectional specification: Power potentiometers UDC 621.316.8.026.442/.443BSCECC41200:1979 This British Standard, having been prepared under the directionof the Electronic Components Standards Committ
2、ee, was published underthe authority of the Executive Board and comes intoeffect on 31January1979 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference ECL/4 Draft for comment 73/29111 DC ISBN 0 580 10705 1 Cooperating organizations The Electronic Componen
3、ts Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following scientific and industrial organizations: British Electrical and Allied Manufacturers Association (BEAMA) Electricity Supply Industry in England and Wales Electronic Compon
4、ents Industry Federation* Electronic Engineering Association* Institution of Electronic and Radio Engineers National Supervising Inspectorate* Post Office* Society of British Aerospace Companies* Telecommunication Engineering and Manufacturing Association (TEMA) The organizations marked with an aste
5、risk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: British Broadcasting Corporation Electrical Research Association Amendments issued since publication Amd. No. Date of issue CommentsBSCECC41200:197
6、9 BSI 09-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword iii Text of CECC 41200 1 Publications referred to Inside back coverBSCECC41200:1979 ii BSI 09-1999 National foreword This British Standard has been prepared under the direction of the Electronic
7、Components Standards Committee. It is identical with CENELEC Electronic Components Committee (CECC)41200 “Harmonized system of quality assessment for electronic components: Sectional specification: Power potentiometers”. This standard is a harmonized specification within the CECC system. Terminology
8、 and conventions. The text of the CECC specification has been approved as suitable for publication, without deviation, 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
9、 been used 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 “General requirements for electronic components of assessed quality harmonized
10、 with the CENELEC Electronic Components Committee System” Part 1 “Basic rules”. At present there is no corresponding British Standard for IEC393-1. IEC393-1 is referred to in the text for information only. NOTETextual error. It should be noted that the unit for torque should be printed “mN m” (see t
11、est schedule). Scope. This standard lists the ratings, characteristics and inspection requirements which shall be included as mandatory requirements in accordance with BSCECC41000:1977. International Standard Corresponding British Standard CECC 41000:1976 BS CECC 41000:1977 Specification for harmoni
12、zed system of quality assessment for electronic components: Generic specification for potentiometers (Identical) IEC 62:1974 BS 1852:1975 Marking codes for resistors and capacitors (Identical) IEC 68-1:1968 BS 2011 Basic environmental testing procedures Part 1.1:1977 General (Identical) IEC 68-2-6:1
13、970 BS 2011-2.1Fc:1977 Test Fc. Vibration (sinusoidal) (Identical) IEC 68-2-13:1966 BS 2011-2.1M:1977 Test M. Low air pressure (Identical) IEC 68-2-14:1974 BS 2011-2.1N:1977 Test N. Change of temperature (Identical) IEC 68-2-20:1968 BS 2011-2.1Ta:1977 Test Ta. Solderability (Identical) IEC 68-2-27:1
14、972 BS 2011-2.1Ea:1977 Test Ea. Shock (Identical) IEC 68-2-29:1968 BS 2011-2.1Eb:1977 Test Eb. Bump (Identical)BSCECC41200:1979 BSI 09-1999 iii Detail specification layout. In the event of conflict between the requirements of this specification and the provisions of BSE9000, the latter shall take pr
15、ecedence except the front page layout will be in accordance with BS9000 Circular Letter No15 dated August1977. 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 Britis
16、h 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, theCECC title page, pages ii to iv, pages 1 to 14, an inside back cover and a back cover. This standard has been updated (see copyright
17、date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.iv blankBSCECC41200:1979 ii BSI 09-1999 Contents Page Foreword iii Section 1. Scope 1 Section 2. Preferred characteristics, ratings and severities for environmental tests 1 2.1 Cha
18、racteristics 1 2.1.1 Climatic severities 1 2.1.2 Temperature characteristics and temperature coefficients of resistance 1 2.1.3 Limits for change in resistance, or output ratio 1 2.1.4 Limits for insulation resistance 2 2.1.5 Limits for resistance law 2 2.2 Ratings 2 2.2.1 Rated resistance 2 2.2.2 T
19、olerance on rated resistance 2 2.2.3 Rated dissipation 2 2.2.4 Limiting element voltage 2 2.2.5 Isolation voltage 2 2.3 Severities for environmental tests 3 2.3.1 Drying 3 2.3.2 Vibration 3 2.3.3 Bump 3 2.3.4 Shock 3 2.3.5 Low air pressure 3 2.3.6 Change of temperature 3 2.3.7 Soldering 4 2.4 Derati
20、ng curve 4 2.5 Information to be given in a detail specification 4 2.5.1 Style 4 2.5.2 Rated dissipation 4 2.5.3 Limiting element voltage 4 2.5.4 Isolation voltage 4 2.5.5 Resistance law 4 2.5.6 Dimensions 5 2.5.7 Resistance range 5 2.5.8 Tolerances on rated resistance 5 2.5.9 Climatic category 5 2.
21、5.10 Vibration severity 5 2.5.11 Bump severity 5 2.5.12 Shock severity 6 2.5.13 Low air pressure severity 6 2.5.14 Soldering 6 2.5.15 Limits of resistance change after1000 h electrical endurance test 6 2.5.16 Starting torque 6 2.5.17 Limiting slider current 6 2.5.18 Terminal resistance and, where ap
22、plicable, residual resistance and minimum effective resistance 6 2.5.19 Derating curve 6 2.5.20 Marking 6 2.5.21 Ordering information 6BSCECC41200:1979 BSI 09-1999 iii Page 2.5.22 Additional information 6 Section 3. Inspection 7 3.1 Formation of inspection lots 7 3.2 Delayed delivery 7 3.3 Test meth
23、ods 7 3.4 Qualification approval 7BSCECC41200:1979 iv BSI 09-1999 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 com
24、ponents of assessed 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 recognized Mark, or Certificate, of Conformity. The components pro
25、duced under the 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 POWER POTENTIOMETERS.
26、 It should 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, Germany, France, Ireland, Italy, the Netherlands, Norway, Sweden, Switzerland, the United Kingdom, and copies of it can be obt
27、ained from the National Committees of the CENELEC in these countries. Preface This sectional 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 Electrote
28、chnical Commission and in particular on IECPublication393-1: Potentiometers. Part1: Terms and methods of test. The text of this sectional specification was circulated to the CECC for voting in the documents listed below and was ratified by the CECC for printing as a CECC Specification. Document Voti
29、ng date CECC(Secretariat)219 19 April 1974 CECC(Secretariat)356 28 April 1975 CECC(Secretariat)442 27 February 1976BSCECC41200:1979 BSI 09-1999 1 Section 1. Scope This sectional specification prescribes the preferred values for characteristics and ratings and also the inspection requirements for pow
30、er potentiometers of assessed quality. Such potentiometers normally have a rated dissipation exceeding10W. It selects from the generic specification, CECC41000, the appropriate methods of test to be used in detail specifications derived from this document. Associated with this document are one or mo
31、re blank detail specifications each referenced by a CECC number. A blank detail specification which has been completed as specified in2.5 of this document forms a detail specification. Such detail specifications may be used for the granting of Qualification Approval to a potentiometer and for the pe
32、rformance of Quality Conformance Inspection in accordance with the CECC System. Section 2. Preferred characteristics ratings and severities for environmental tests 2.1 Characteristics The values given in detail specifications shall preferably be selected from the following: 2.1.1 Climatic severities
33、 The potentiometers 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 within the following ranges: Values selected within these ranges
34、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 respectively. For some potentiometers, these temperatures will occur between two of the preferred temperatures given in IEC68-2. In this ca
35、se, the nearest preferred temperature within the category temperature range of the potentiometer shall be chosen for this severity. 2.1.2 Temperature characteristics and temperature coefficients of resistance The measurement of temperature characteristic, or temperature coefficient, of resistance is
36、 not considered appropriate to this type of potentiometer. 2.1.3 Limits for change in resistance, or output ratio The preferred combinations of limits for change in resistance or output ratio in each of the tests listed in the heading of the following table are as indicated in the lines of the table
37、. NOTEThe paragraph numbers in the headings of the table refer to CECC41000. Cold (Test A) 10 to 65 C Dry heat (Test B) + 85 to + 125 C Damp heat, steady state (Test C) 4 to 56 daysBSCECC41200:1979 2 BSI 09-1999 NOTEFor potentiometers with looking devices, the limit of change shall be2%. 2.1.4 Limit
38、s for insulation resistance The preferred limits for insulation resistance shall be1G7 minimum or, after humidity tests, 100M7. 2.1.5 Limits for resistance law The preferred measuring points and associated values of the output ratio for resistance laws are: 2.2 Ratings The values given in detail spe
39、cifications shall preferably be selected from the following: 2.2.1 Rated resistance See2.3.2 of CECC41000. 2.2.2 Tolerance on rated resistance The preferred tolerances on rated resistance are: 10% and 5%. 2.2.3 Rated dissipation The preferred values of rated dissipation at70 C are: 10, 16, 25, 40, 5
40、0, 63, 80, 100, 125, 160, 250, 315, 400, 500, 630, 800 and 1000W. 2.2.4 Limiting element voltage The preferred values of limiting element voltage are: 160, 250, 400, 630, 1000 and 1600V d.c. or a.c. r.m.s. 2.2.5 Isolation voltage 2.2.5.1 Normal air pressure The detail specification shall state the v
41、alue of the isolation voltage, rounded up to the nearest10V. The numerical value of the isolation voltage shall be not less than1,42 times the limiting element voltage. 4.28 Climatic sequence 4.21 Robustness of terminations 4.20 Thrust and pull on spindle 4.25.2 Vibration (Where applicable) See Note
42、 4.29 Damp heat, steady state 4.23.2 Resistance to solder heat 4.24.3 Change of temperature 4.30 Mechanical endurance 4.24 Change of temperature 4.32.2 Electrical endurance atroom temperature 4.25 4.26 4.27 Vibration Bump Shock % % R/R between terminations a and c % % (10 % + 0,5 7) (5 % + 0,1 7) 5
43、% 5 % (5 % + 1,1 7) (2 % + 0,1 7) 2 % 5 % (3 % + 0,1 7) (1 % + 0,05 7) 1 % 3 % Resistance law % of effective electrical travel Output ratio % A (linear) 50 1 R 22 7 : 40 60 R k 22 7 : 35 65 Vab Vac - Vab Vac - Vab Vac -BSCECC41200:1979 BSI 09-1999 3 2.2.5.2 Low air pressure At 8,5 kPa (85 mbar); two
44、 thirds the isolation voltage. 2.3 Severities for environmental tests Test severities given in detail specifications shall preferably be selected from the following: 2.3.1 Drying Procedure I of 4.2 of CECC41000 shall be used. 2.3.2 Vibration Potentiometers shall be mounted by their normal means, in
45、such a manner that there shall be no parasitic vibration. 2.3.3 Bump Potentiometers shall be mounted by their normal means, in such a manner that there shall be no parasitic vibration. 2.3.4 Shock Potentiometers shall be mounted by their normal means, in such a manner that there shall be no parasiti
46、c vibration. 2.3.5 Low air pressure Test M (IEC 68-2-13) 8,5 kPa (85 mbar) 2.3.6 Change of temperature Test Na or Nb (IEC68-2-14) For rated dissipations equal to or less than100W, Test Na shall be applied, and the duration of exposure at the extremes of temperature shall be30min. For rated dissipati
47、ons greater than100W, TestNb shall be applied with a duration of exposure at the extremes of temperature of30min and, a rate of change of temperature of5 /min. Test Fc (IEC68-2-6). Procedure B4. Frequency range : 10 Hz to 55 Hz, or 10 Hz to 500 Hz, Amplitude : 0,75 mm or 98 m/s 2(whichever is the le
48、ss severe) Sweep endurance: Total duration: 6 h. Test Eb (IEC 68-2-29) Acceleration : 390 m/s 2 Number of bumps : 4 000 (total) Test Ea (IEC 68-2-27) Pulse shape : Half sine Acceleration : 490 m/s 2 Pulse duration: 11 ms Severity : 3 successive shocks in any one direction per specimen. Separate spec
49、imens to be used for any one direction.BSCECC41200:1979 4 BSI 09-1999 2.3.7 Soldering 2.4 Derating curve The detail specification shall state the maximum allowable dissipation at temperatures other than70 C. Break points which differ from those given below shall be verified 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 paragra
