1、BRITISH STANDARD BS CECC 41300:1979 Harmonized system of quality assessment for electronic components Sectional specification: Low power single-turn rotary potentiometersBSCECC41300:1979 This British Standard, having been prepared under the directionof the Electronic Components Standards Committee,
2、was published underthe authority of the Executive Board and comesintoeffect on 31October1979 BSI 05-2000 The following BSI references relate to the work on this standard: Committee reference ECL/4 Draft for comment 73/28111 DC ISBN 0 580 10979 8 Cooperating organizations The Electronic Components St
3、andards 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 Electricity Supply Industry in England and Wales* Electronic Components Industr
4、y 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 asterisk in the
5、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 CommentsBSCECC41300:1979 BSI 05-200
6、0 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword iv Text of CECC 41300 1 Publications referred to Inside back coverBSCECC41300:1979 ii BSI 05-2000 National foreword This British Standard has been prepared under the direction of the Electronic Components St
7、andards Committee. It is identical with CENELEC Electronic Components Committee CECC41300 “Harmonized system of quality assessment for electronic components. Sectional specification: Low power single turn rotary potentiometers”. This standard is a harmonized specification within the CECC system. Ter
8、minology 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 c
9、omma 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 BSE9000 “General requirements for electronic components of assessed quality ha
10、rmonized with the CENELEC Electronic Components Committee System” Part1 “Basic rules”. The following International Standards are referred to in the text and for each there is a corresponding British Standard; these are listed below: At present there is no corresponding British Standard for IEC393-1.
11、 IEC393-1 is referred to in the text for information purposes only. International Standard Corresponding British Standard CECC 41000:1976 BS CECC 41000:1977 Harmonized system of quality assessment for electronic components: Generic specification for potentiometers (Identical) IEC 68-1:1968 BS 2011 B
12、asic environmental testing procedures Part 1.1:1977 General (Identical) IEC 68-2-6:1970 BS 2011 Basic environmental testing procedures Part 2.1Fc:1977 Test Fc: Vibration (sinusoidal) (Identical) IEC 68-2-13:1966 BS 2011 Basic environmental testing procedures Part 2.1M:1977 Test M: Low air pressure (
13、Identical) IEC 68-2-14:1974 BS 2011 Basic environmental testing procedures Part 2.1N:1977 Test N: Change of temperature (Identical) IEC 68-2-20:1968 BS 2011 Basic environmental testing procedures Part 2.1Ta:1977 Test Ta: Solderability (Identical) IEC 68-20A:1970 BS 2011 Basic environmental testing p
14、rocedures Part 2.1Tb:1977 Test Tb: Soldering resistance to soldering heat, Method1 (Identical) IEC 68-2-27:1972 BS 2011 Basic environmental testing procedures Part 2.1Ea:1977 Test Ea: Shock (Identical) IEC 68-2-29:1968 BS 2011 Basic environmental testing procedures Part 2.1Eb:1977 Test Eb: Bump (Ide
15、ntical)BSCECC41300:1979 BSI 05-2000 iii 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 immunity from legal obligations. S
16、ummary of pages This document comprises a front cover, an inside front cover, pagesi toiv, theCECC title page, pages ii to iv, pages1to20, an inside back cover and abackcover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the
17、amendment table on the inside front cover.iv blankBSCECC41300:1979 ii BSI 05-2000 Contents Page Foreword iv Section 1. Scope 1 Section 2. Preferred characteristics, ratings and severities for environmental tests 2.1 Characteristics 1 2.1.1 Climatic severities 1 2.1.2 Temperature characteristics and
18、temperature coefficients of resistance 1 2.1.3 Limits for change in resistance, or output ratio 4 2.1.4 Limits for insulation resistance 4 2.1.5 Limits for resistance law 4 2.1.6 Limits for starting torque 5 2.1.7 Limits for switch torque 5 2.2 Ratings 5 2.2.1 Rated resistance 5 2.2.2 Tolerances on
19、rated resistance 5 2.2.3 Rated dissipation 5 2.2.4 Limiting element voltage 5 2.2.5 Isolation voltage 5 2.2.6 Switch rating 6 2.3 Severities for environmental tests 6 2.3.1 Drying 6 2.3.2 Vibration 6 2.3.3 Bump 6 2.3.4 Shock 6 2.3.5 Low air pressure 6 2.3.6 Change of temperature 7 2.3.7 Soldering 7
20、2.4 Derating curve 7 2.5 Information to be given in a detail specification 7 2.5.1 Style 7 2.5.2 Rated dissipation 8 2.5.3 Limiting element voltage 8 2.5.4 Isolation voltage 8 2.5.5 Resistance law 8 2.5.6 Dimensions 8 2.5.7 Resistance range 8 2.5.8 Tolerances on rated resistance 9 2.5.9 Temperature
21、characteristics of resistance 9 2.5.10 Climatic category 9 2.5.11 Vibration severity 9 2.5.12 Bump severity 9 2.5.13 Shock severity 9 2.5.14 Low air pressure severity 9 2.5.15 Soldering 9 2.5.16 Limits of resistance change after 1 000 h, electrical endurance test 9 2.5.17 Starting torque 9 2.5.18 Sw
22、itch torque 9BSCECC41300:1979 BSI 05-2000 iii Page 2.5.19 Switch rating 9 2.5.20 Limiting slider current 9 2.5.21 Terminal resistance and, where applicable, Residual resistance and minimum effective resistance 9 2.5.22 Derating curve 9 2.5.23 Marking 9 2.5.24 Ordering information 10 2.5.25 Additiona
23、l information 10 Section 3. Inspection 3.1 Formation of inspection lots 11 3.2 Delayed delivery 11 3.3 Test methods 11 3.4 Qualification approval 11 Table 1 Preferred temperature characteristics and coefficients of resistance(non-wirewound potentiometers) 2 Table 2 Preferred temperature characterist
24、ics and coefficients of resistance(wirewound potentiometers) 3BSCECC41300:1979 iv BSI 05-2000 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 harmoniz
25、ed System 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 Co
26、nformity. 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 specificatio
27、ns for LOW POWER SINGLE TURN ROTARY POTENTIOMETERS. It should be read in conjunction with document CECC00100: Basic Rules (1974). Preface This sectional specification was prepared by CECC Working Group4: “Resistors”. In accordance with the requirements of document CECC00100 it is based, wherever pos
28、sible, on the Recommendations of the International Electrotechnical 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
29、the CECC for printing as a CECC Specification. Document Voting date CECC(Secretariat)220 19 April 1974 CECC(Secretariat)355 28 April 1975 CECC(Secretariat)437 27 February 1976BSCECC41300:1979 BSI 05-2000 1 Section 1. Scope This sectional specification prescribes the preferred values for characterist
30、ics and ratings and also the inspection requirements for low power single turn rotary 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 document. Associated with this documen
31、t are one or more 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
32、 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 selected from the following: 2.1.1 Clima
33、tic severities The potentiometers covered by this document are classified into climatic categories according to the general rules given in the Appendix toIEC68-1. The standard severities for the cold, dry heat and damp heat, steady state tests are within the following ranges: Values selected within
34、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 preferred temperatures given in IEC68-
35、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 preferred temperature characteristi
36、c of resistance are given inTable 1 (for non-wirewound potentiometers) andTable 2 (for wirewound potentiometers). Each line in the tables gives the temperature coefficient and corresponding temperature characteristic for20 to70 C and limits of change in resistance for the measurement of temperature
37、characteristic of resistance (4.14 of CECC41000) 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 specifi
38、cation. If measurements at additional temperatures are required, they shall be called for in the detail specifications. 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 41300:1979 2 BSI 05-2000 Table 1 Preferred temperature characteristi
39、cs and coefficients of resistance (non-wirewound potentiometers) Temperature Coefficient 10 6 / C Percentage change in resistance 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,
40、3 10,8/ 33,8 400/1000 +3,4/ +8,5 +3,0/ +7,5 +2,4/ +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,
41、5 2,5 3,3 4,0 5,3 6,8 250 2,15 1,90 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 a Potentiometers having an upper category temperature of +85 C
42、need not be measured between +20 C and +70 C.BS CECC 41300:1979 BSI 05-2000 3 Table 2 Preferred temperature characteristics and coefficients of resistance(wirewound potentiometers) Temperature coefficient 10 6 / C Percentage change in resistance 20/65 20/55 20/40 20/ 25 20/10 20/70 a 20/85 a 20/100
43、20/125 20/155 +600/200 5,1/ +1,7 4,5/ +1,5 3,5/ +1,2 2,7/ +0,9 1,8/ +0,6 +3,0/ 1,0 +3,9/ 1,3 +4,8/ 1,6 +6,3/ 2,1 +8,1/ 2,7 250 2,15 1,90 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,
44、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 category temperature of +85 C need not be measured between +20 C and +70 C.BSCECC41300:1979 4 BSI 05-2000 2.1.3 Limits for change in resistance, or output ratio The p
45、referred 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. NOTEThe paragraph numbers in the headings of the table refer to CECC41000. 2.1.4 Limits for insulation resistance The
46、 preferred limits for insulation resistance shall be 1G7 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: 1) Non-wirewound potentiometers 4.28 Climatic sequence 4.24 Change of tem
47、perature 4.21 Robustness of terminations 4.20 Thrust and pull on spindle 4.25.2 Vibration (Where applicable) 4.29 Damp heat, steady state 4.23.2 Resistance to solder heat 4.24.3 Change of temperature 4.30 Mechanical endurance 4.25 Vibration 4.32.2 Electrical endurance at70 C 4.26 Bump 4.32.3 Electri
48、cal endurance at upper category temperature 4.27 Shock % % R/R between terminations a and c (See D.3.1) Non-wirewound potentiometers (15% + 0,5 7) (5% + 0,1 7) (3% + 0,1 7) 3 % 3 % (10% + 0,5 7) (3% + 0,1 7) (2% + 0,1 7) 2 % 2 % (5% + 0,1 7) (2% + 0,1 7) (1% + 0,05 7) 1 % 1 % (2% + 0,1 7) (1% + 0,05 7) (0,5 + 0,05 7) 0,5 % 0,5 % Wirewound potentiometers (5 % + 0,1 7) (2 % + 0,1 7) (1 % + 0,05 7) 1 % 1 % (3 % + 0,1 7) (2 % + 0,1 7) (1 % + 0,05 7) 1 % 1 % (2 % + 0,1 7) (1 % + 0,05 7)
