1、BRITISH STANDARD BS CECC 41100:1978 Incorporating Amendment No. 1 Harmonized system of quality assessment for electronic components: Sectional specification: Lead screw actuated and rotary preset potentiometers UDC 621.316.82BSCECC41100:1978 This British Standard, having been prepared under the dire
2、ctionof the Electronic Components Standards Committee, was published underthe authority of the Executive Board on 29December1978 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference ECL/4 Draft for comment 73/76379 DC ISBN 0 580 10479 6 Cooperating organi
3、zations The Electronic Components Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following Government department and scientific and industrial organizations: British Electrical and Allied Manufacturers Association (BEAMA) Electrici
4、ty Supply Industry in England and Wales Electronic Components Industry Federation* Institution of Electronic and Radio Engineers Ministry of Defence* National Supervising Inspectorate* Post Office* Society of British Aerospace Companies Limited* Telecommunication Engineering and Manufacturing Associ
5、ation (TEMA) Trades Union Congress 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: Electrical Research Association Electronic Engineering Association Amendmen
6、ts issued since publication Amd. No. Date of issue Comments 5512 December 1987 Indicated by a sideline in the marginBSCECC41100:1978 BSI 09-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword iv Text of CECC 41100 1BSCECC41100:1978 ii BSI 09-1999 National
7、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) 41100 “Sectional specification: Lead screw actuated and rotary preset potentiometers”, and Amendment No. 1 (1986)
8、. 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 conventions are not identical with those used in
9、 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 Standard harmonized with CECC00100 is BSE90
10、00 “General requirements for electronic components of assessed quality harmonized with the CENELEC Electronic Component Committee system”. For each of the following International Standards referred to in the text there is a corresponding British Standard; these are as listed below: The reference to
11、IEC 393-1, for which there is no equivalent British Standard, is for information purposes only. Scope. This standard lists the ratings, characteristics and inspection requirements which shall be included as mandatory requirements in accordance with BSCECC41000. Detail specification layout. In the ev
12、ent of conflict between the requirements of this British Standard and the provisions of BSE9000 the latter shall take precedence except that the front page layout shall be in accordance with the requirements of BS9000 Circular Letter No. 15 dated August 1977. A British Standard does not purport to i
13、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 41000:1976 BS CECC 410
14、00:1977 Harmonized system of quality assessment for electronic components: Generic specification for potentiometers (Identical) IEC 68 BS 2011 Basic environmental testing procedures (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theCECC tit
15、le page, pages ii to iv, pages 1 to 15 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.BSCECC41100:1978 ii BSI 09-1999 Contents Page Foreword iv Section 1. Scope 1
16、Section 2. Preferred characteristics, ratings and severities for environmental tests 1 2.1 Characteristics 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 3 2.1.4 Limits for insulation
17、 resistance 3 2.1.5 Total mechanical travel 3 2.1.6 Limit for contact resistance 3 2.2 Ratings 3 2.2.1 Rated resistance 3 2.2.2 Tolerances on rated resistance 3 2.2.3 Rated dissipation 3 2.2.4 Limiting element voltage 4 2.2.5 Isolation voltage 4 2.3 Severities for environmental tests 4 2.3.1 Drying
18、4 2.3.2 Vibration 4 2.3.3 Bump 4 2.3.4 Shock 4 2.3.5 Low air pressure 5 2.3.6 Change of temperature 5 2.3.7 Soldering 5 2.4 Derating curve 5 2.5 Information to be given in a detail specification 6 2.5.1 Style 6 2.5.2 Rated dissipation 6 2.5.3 Limiting element voltage 6 2.5.4 Isolation voltage 6 2.5.
19、5 Resistance law 6 2.5.6 Dimensions 6 2.5.7 Resistance range 6 2.5.8 Tolerances on rated resistance 6 2.5.9 Temperature characteristics of resistance 6 2.5.10 Climatic category 6 2.5.11 Vibration severity 6 2.5.12 Bump severity 6 2.5.13 Shock severity 6 2.5.14 Low air pressure severity 6 2.5.15 Sold
20、ering 6 2.5.16 Limits of resistance change after 1000h electrical endurance test 7 2.5.17 Starting torque 7 2.5.18 End-stop torque 7 2.5.19 Total mechanical travel 7 2.5.20 Limiting slider current 7BSCECC41100:1978 BSI 09-1999 iii Page 2.5.21 Terminal resistance and, where applicable, minimumeffecti
21、veresistance 7 2.5.22 Derating curve 7 2.5.23 Marking 7 2.5.24 Ordering information 7 2.5.25 Contact resistance 7 2.5.26 Additional information 7 Section 3. Inspection 8 3.1 Formation of inspection lots 8 3.2 Delayed delivery 8 3.3 Test methods 8 3.4 Qualification approval 8 Table 1 Preferred temper
22、ature characteristics and coefficients of resistance 2BSCECC41100:1978 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 Syste
23、m for electronic components 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
24、. The components produced 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 L
25、EAD SCREW ACTUATED AND ROTARY PRESET POTENTIOMETERS. It should be read in conjunction with 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, Switze
26、rland, the United Kingdom, and copies of it can be obtained from the National Committees 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 CECC00100 it is based, wherever possible
27、, on the Recommendations of the International Electrotechnical Commission and in particular on IEC Publication393-1: Potentiometers. Part 1:Terms and methods of test. The text of this sectional specification wins circulated to the CECC for voting in the documents listed below and was ratified by the
28、 CECC for printing as a CECCSpecification. Document Voting date CECC(Secretariat)213 CECC(Secretariat)354 CECC(Secretariat)436 CECC(Secretariat)1566 3 April 28 April 27 February May 1974 1974 1976 1984BSCECC41100:1978 BSI 09-1999 1 Section 1. Scope This sectional specification prescribes the preferr
29、ed values for characteristics and ratings and also the inspection requirements for lead screw actuated and rotary preset potentiometers of assessed quality. It selects from the generic specification, CECC41000, the appropriate methods of test to be used in detail specifications derived from this doc
30、ument. Associated with this document are one or more blank detail specifications each referenced by a CECCnumber. A blank detail specification which has been completed as specified in 2.5 of this document forms a detail specification. Such detail specifications may be used for the granting of Qualif
31、ication Approval to a potentiometer and for the performance of Quality Conformance Inspection in accordance with the CECCSystem. Section 2. Preferred characteristics ratings and severities for environmentaltests 2.1 Characteristics The values given in detail specifications shall preferably be select
32、ed 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 IEC68-1. The standard severities for the cold, dry heat and damp heat steady state tests are within the followi
33、ng 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 respectively. For some potentiometers, these temperatures will occur between two of the pref
34、erred temperatures given in IEC68-2. 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 coefficients of resistance The limits of change in resistance for the p
35、referred temperature characteristic of resistance are given inTable 1. Each line in the table gives the temperature coefficient and corresponding temperature characteristic for20 to 70 C and limits of change in resistance for the measurement of temperature characteristic of resistance (4.14 of CECC4
36、1000) on the basis of the category temperature ranges of2.1.1 of this document. Different portions of the resistance range may be covered by different temperature characteristics (orcoefficients) of resistance although they appear in a single detail specification. If measurements at additional tempe
37、ratures are required, they shall be called for in the detail specification. Cold (Test A) 10 to 65 C Dry heat (Test B) + 70 to + 155 C Damp heat, steady state (Test C) 4 to 56 daysBS CECC 41100:1978 2 BSI 09-1999 Table 1 Preferred temperature characteristics and coefficients of resistance Temperatur
38、e Coefficient Percentage change in resistance 10 6 / C 20/ 65 20/ 55 20/ 40 20/ 25 20/ 10 20/70 a 20/85 a 20/100 20/125 20/155 800/ 2500 + 6,8 + 21,3 + 6,0/ + 18,8 + 4,8/ + 15,0 + 3,6/ + 11,3 + 2,4/ + 7,5 4,0/ 12,5 5,2/ 16,3 6,4/ 20,0 8,4/ 26,3 10,8/ 33,8 400/ 1000 + 3,4/ + 8,5 + 3,0/ + 7,5 + 2,4/ +
39、 6,0 + 1,8/ + 4,5 + 1,2/ + 3,0 2,0/ 5,0 2,6/ 6,5 3,2/ 8,0 4,2/ 10,5 5,4/ 13,5 150/ 600 + 1,3/ + 5,1 + 1,1/ + 4,5 + 0,9/ + 3,5 + 0,6/ + 2,7 + 0,4/ + 1,8 0,7/ 3,0 0,9/ 3,9 1,2/ 4,8 1,5/ 6,3 2,0/ 8,1 1000 8,5 7,5 6,0 4,5 3,0 5,0 6,5 8,0 10,5 13,5 500 4,3 3,8 3,0 2,2 1,5 2,5 3,3 4,0 5,3 6,8 250 2,15 1,9
40、0 1,50 1,15 0,75 1,25 1,65 2,00 2,65 3,40 150 1,30 1,15 0,90 0,70 0,45 0,75 1,00 1,20 1,60 2,05 100 0,85 0,75 0,60 0,45 0,30 0,50 0,65 0,80 1,05 1,35 50 0,43 0,38 0,30 0,23 0,15 0,25 0,33 0,40 0,53 0,68 25 0,215 0,190 0,150 0,115 0,075 0,125 0,165 0,200 0,265 0,340 a Potentiometers having an upper c
41、ategory temperature of + 85 C need not be measured between + 20 C and + 70 C.BSCECC41100:1978 BSI 09-1999 3 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
42、 table are as indicated in the lines of the table. NOTEThe paragraph numbers in the heading of the table refer to CECC 41000. 2.1.4 Limits for insulation resistance The preferred limits for insulation resistance shall be 1G 7 minimum or, after humidity tests, 100M7. 2.1.5 Total mechanical travel The
43、 preferred values shall be: 1) For lead-screw actuated preset potentiometers: 4, 15, 22 and 30 turns. 2) For single turn rotary preset potentiometers: The angle shall be specified in the detail specification. 2.1.6 Limit for contact resistance (if prescribed in the detail specification) The maximum
44、contact resistance, as measured in D.1.3 of BS CECC41000 if prescribed in the detail specification, shall be specified as a percentage of the rated resistance. 2.2 Ratings The values given in detail specifications shall preferably be selected from the following: 2.2.1 Rated resistance See 2.3.2 of C
45、ECC41000. 2.2.2 Tolerances on rated resistance The preferred tolerances on rated resistance are: 30%, 20%, 10% and 5%. 2.2.3 Rated dissipation The preferred values of rated dissipation at 70 C are: 4.28 Climatic sequence 4.24 Change of temperature 4.21 Robustness of terminations 4.32.2 Electrical en
46、durance at70 C 4.20 Thrust and pull on spindle 4.25.2 Vibration 4.29 Damp heat, steady state 4.23.2 Resistance tosolder heat 4.32.3 Electrical endurance atupper category temperature 4.24.3 Change of temperature 4.30 Mechanical endurance 4.25 Vibration 4.32.2 Electrical endurance at70 C 4.26 Bump 4.3
47、2.3 Electrical endurance at upper category temperature 4.27 Shock % %R/R between terminations a and c % % R/R between terminations a and b (See Note) (See Note) (See Note) (10% + 0,5 7) (5% + 0,1 7) (5% + 0,1 7) (15% + 0,5 7) 5% 7,5% (5% + 0,1 7) (3% + 0,1 7) (2% + 0,1 7) (7,5% + 0,1 7) 2% 3% (3% +
48、0,1 7) (2% + 0,1 7) (1% + 0,05 7) (5% + 0,1 7) 1% 2% (2% + 0,1 7) (2% + 0,1 7) (1% + 0,05 7) (3% + 0,1 7) 1% 2% NOTEFor wirewound potentiometers, the resolution should be added to the permissible output ratio in4.20, 4.24 and4.25; and to the permissible change in resistance a to b in4.32.2 and4.32.3.%VabVac - %VabVac -BSCECC41100:1978 4 BSI 09-1999 0,063; 0,125; 0,25; 0,5; 0,75; 1 and 2W. 2.2.4 Limiting element voltage The preferred values of limiting element voltage are: 100, 125, 160, 200, 250, 315 V d.c. or a.c. r.m.s. 2.2.5 Isolation volt
