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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/.443 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 17:01:17 GMT+00:00 2006, Uncontrolled C
2、opy, (c) BSI BS CECC 41200:1979 This British Standard, having been prepared under the direction of the Electronic Components Standards Committee, was published under the authority of the Executive Board and comes into effect on 31 January 1979 BSI 09-1999 The following BSI references relate to the w
3、ork on this standard: Committee reference ECL/4 Draft for comment 73/29111 DC ISBN 0 580 10705 1 Cooperating organizations The Electronic Components Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following scientific and industrial
4、 organizations: British Electrical and Allied Manufacturers Association (BEAMA) Electricity Supply Industry in England and Wales Electronic Components Industry Federation* Electronic Engineering Association* Institution of Electronic and Radio Engineers National Supervising Inspectorate* Post Office
5、* Society of British Aerospace Companies* Telecommunication Engineering and Manufacturing Association (TEMA) The organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: B
6、ritish Broadcasting Corporation Electrical Research Association Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 17:01:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS CECC 41200:1979 BSI 09-1999i
7、Contents Page Cooperating organizationsInside front cover National forewordii Forewordiii Text of CECC 412001 Publications referred toInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 17:01:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS CECC 41
8、200:1979 ii BSI 09-1999 National foreword This British Standard has been prepared under the direction of the Electronic Components Standards Committee. It is identical with CENELEC Electronic Components Committee (CECC) 41200 “Harmonized system of quality assessment for electronic components: Sectio
9、nal specification: Power potentiometers”. 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 deviation, as a British Standard. Some terminology and certain conventi
10、ons 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 the baseline as the decimal marker. Cross-references. The British Sta
11、ndard harmonized with CECC 00100 is BS E9000 “General requirements for electronic components of assessed quality harmonized with the CENELEC Electronic Components Committee System” Part 1 “Basic rules”. At present there is no corresponding British Standard for IEC 393-1. IEC 393-1 is referred to in
12、the text for information only. NOTETextual error. It should be noted that the unit for torque should be printed “mN m” (see test schedule). Scope. This standard lists the ratings, characteristics and inspection requirements which shall be included as mandatory requirements in accordance with BS CECC
13、 41000:1977. International StandardCorresponding British Standard CECC 41000:1976BS CECC 41000:1977 Specification for harmonized system of quality assessment for electronic components: Generic specification for potentiometers (Identical) IEC 62:1974BS 1852:1975 Marking codes for resistors and capaci
14、tors (Identical) IEC 68-1:1968BS 2011 Basic environmental testing procedures Part 1.1:1977 General (Identical) IEC 68-2-6:1970BS 2011-2.1Fc:1977 Test Fc. Vibration (sinusoidal) (Identical) IEC 68-2-13:1966BS 2011-2.1M:1977 Test M. Low air pressure (Identical) IEC 68-2-14:1974BS 2011-2.1N:1977 Test N
15、. Change of temperature (Identical) IEC 68-2-20:1968BS 2011-2.1Ta:1977 Test Ta. Solderability (Identical) IEC 68-2-27:1972BS 2011-2.1Ea:1977 Test Ea. Shock (Identical) IEC 68-2-29:1968BS 2011-2.1Eb:1977 Test Eb. Bump (Identical) Licensed Copy: London South Bank University, London South Bank Universi
16、ty, Fri Dec 08 17:01:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS CECC 41200:1979 BSI 09-1999iii Detail specification layout. In the event of conflict between the requirements of this specification and the provisions of BS E9000, the latter shall take precedence except the front page layout will
17、 be in accordance with BS 9000 Circular Letter No 15 dated August 1977. 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 of itself confer im
18、munity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, the CECC 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 date) and may have had amendments inco
19、rporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 17:01:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: London South Bank University, London South Bank Univers
20、ity, Fri Dec 08 17:01:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 17:01:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS CECC 41200:1979 ii BSI 09-1999 Contents Page Forewordiii Section 1. Scope1 Section 2. Prefe
21、rred characteristics, ratings and severities for environmental tests1 2.1Characteristics1 2.1.1Climatic severities1 2.1.2Temperature characteristics and temperature coefficients of resistance1 2.1.3Limits for change in resistance, or output ratio1 2.1.4Limits for insulation resistance2 2.1.5Limits f
22、or resistance law2 2.2Ratings2 2.2.1Rated resistance2 2.2.2Tolerance on rated resistance2 2.2.3Rated dissipation2 2.2.4Limiting element voltage2 2.2.5Isolation voltage2 2.3Severities for environmental tests3 2.3.1Drying3 2.3.2Vibration3 2.3.3Bump3 2.3.4Shock3 2.3.5Low air pressure3 2.3.6Change of te
23、mperature3 2.3.7Soldering4 2.4Derating curve4 2.5Information to be given in a detail specification4 2.5.1Style4 2.5.2Rated dissipation4 2.5.3Limiting element voltage4 2.5.4Isolation voltage4 2.5.5Resistance law4 2.5.6Dimensions5 2.5.7Resistance range5 2.5.8Tolerances on rated resistance5 2.5.9Climat
24、ic category5 2.5.10Vibration severity5 2.5.11Bump severity5 2.5.12Shock severity6 2.5.13Low air pressure severity6 2.5.14Soldering6 2.5.15Limits of resistance change after 1 000 h electrical endurance test6 2.5.16Starting torque6 2.5.17Limiting slider current6 2.5.18Terminal resistance and, where ap
25、plicable, residual resistance and minimum effective resistance6 2.5.19Derating curve6 2.5.20Marking6 2.5.21Ordering information6 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 17:01:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS CECC 41200:1979 BSI 09-1999iii
26、 Page 2.5.22Additional information6 Section 3. Inspection7 3.1Formation of inspection lots7 3.2Delayed delivery7 3.3Test methods7 3.4Qualification approval7 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 17:01:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS CE
27、CC 41200:1979 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 components of assessed quality. The obje
28、ct 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 produced under the System are thereby ac
29、cepted 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. It should be read in conjunction wit
30、h document CECC 00100: 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 obtained from the National Committees
31、of the CENELEC in these countries. Preface This sectional specification was prepared by CECC Working Group 4: “Resistors”. In accordance with the requirements of document CECC 00100 it is based, wherever possible, on the Recommendations of the International Electrotechnical Commission and in particu
32、lar on IEC Publication 393-1: Potentiometers. Part 1: 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. DocumentVoting date CECC(Secretariat)21919
33、April 1974 CECC(Secretariat)35628 April 1975 CECC(Secretariat)44227 February 1976 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 17:01:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS CECC 41200:1979 BSI 09-19991 Section 1. Scope This sectional specification pr
34、escribes the preferred values for characteristics and ratings and also the inspection requirements for power potentiometers of assessed quality. Such potentiometers normally have a rated dissipation exceeding 10 W. It selects from the generic specification, CECC 41000, the appropriate methods of tes
35、t to be used in detail specifications derived from this document. Associated with this document are one or more blank detail specifications each referenced by a CECC number. A blank detail specification which has been completed as specified in 2.5 of this document forms a detail specification. Such
36、detail specifications may be used for the granting of Qualification Approval to a potentiometer and for the performance of Quality Conformance Inspection in accordance with the CECC System. Section 2. Preferred characteristics ratings and severities for environmental tests 2.1 Characteristics The va
37、lues given in detail specifications shall preferably be selected from the following: 2.1.1 Climatic severities The potentiometers covered by this document are classified into climatic categories according to the general rules given in the Appendix to IEC 68-1. The standard severities for the cold, d
38、ry heat and damp heat, steady state tests are within the following ranges: Values selected within these ranges shall be chosen from those listed in the relevant tests of IEC 68-2. The severities for the cold and dry heat tests are the lower and upper category temperatures respectively. For some pote
39、ntiometers, these temperatures will occur between two of the preferred temperatures given in IEC 68-2. In this case, 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 coeff
40、icients of resistance The measurement of temperature characteristic, or temperature coefficient, of resistance is 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 r
41、atio in each of the tests listed in the heading of the following table are as indicated in the lines of the table. NOTEThe paragraph numbers in the headings of the table refer to CECC 41000. Cold (Test A) 10 to 65 C Dry heat (Test B)+ 85 to + 125 C Damp heat, steady state (Test C)4 to 56 days Licens
42、ed Copy: London South Bank University, London South Bank University, Fri Dec 08 17:01:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS CECC 41200:1979 2 BSI 09-1999 NOTEFor potentiometers with looking devices, the limit of change shall be 2 %. 2.1.4 Limits for insulation resistance The preferred lim
43、its for insulation resistance shall be 1 G 7 minimum or, after humidity tests, 100 M 7. 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 specifications shall preferably be selected
44、 from the following: 2.2.1 Rated resistance See 2.3.2 of CECC 41000. 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 at 70 C are: 10, 16, 25, 40, 50, 63, 80, 100, 125, 160, 250, 315,
45、 400, 500, 630, 800 and 1 000 W. 2.2.4 Limiting element voltage The preferred values of limiting element voltage are: 160, 250, 400, 630, 1 000 and 1 600 V 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 value of the isolation voltage,
46、 rounded up to the nearest 10 V. The numerical value of the isolation voltage shall be not less than 1,42 times the limiting element voltage. 4.28Climatic sequence 4.21Robustness of terminations 4.20Thrust and pull on spindle 4.25.2Vibration (Where applicable) See Note 4.29Damp heat, steady state 4.
47、23.2Resistance to solder heat 4.24.3Change of temperature 4.30Mechanical endurance 4.24Change of temperature 4.32.2Electrical endurance at room 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 % 5 % (5 % + 1,1 7) (2 % + 0,1 7) 2 %
48、 5 % (3 % + 0,1 7) (1 % + 0,05 7) 1 % 3 % Resistance law % of effective electrical travel Output ratio % A (linear)50 1R 22 7: 40 60 R k 22 7 : 35 65 Vab Vac - - Vab Vac - - Vab Vac - - Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 17:01:17 GMT+00:00 2006, Unc
49、ontrolled Copy, (c) BSI BS CECC 41200:1979 BSI 09-19993 2.2.5.2 Low air pressure At 8,5 kPa (85 mbar); two 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 CECC 41000 shall be used. 2.3.2 Vibration Potentiometers shall be mounted by their normal means, in such a manner that there shall be no parasitic vibration. 2.3.3 Bump Potentiometers shall be mounted by their norm
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