1、BRITISH STANDARD BS CECC 41400:1980 Incorporating Amendment No. 1 Harmonized system of quality assessment for electronic components: Sectional specification: Rotary precision potentiometers UDC 621.316.82BSCECC41400:1980 This British Standard, having been prepared under the directionof the Electroni
2、c Components Standards Committee, was published underthe authority of the Executive Board and comesintoeffect on 29February 1980 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference ECL/4 Draft for comment 75/21463 DC ISBN 0 580 11080 X Cooperating organi
3、zations The Electronic Components 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 Engl
4、and and Wales* Electronic Components 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 o
5、rganizations 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: British Broadcasting Corporation Electrical Research Association Amendments issued since publication Amd. No. Date
6、of issue Comments 4424 December 1983 Indicated by a sideline in the marginBSCECC41400:1980 BSI 09-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword iv Text of CECC 41400 1 Publications referred to Inside back coverBSCECC41400:1980 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)41400 “Harmonized system of quality assessment for electronic components: Sectional specification: Rotary precisi
8、on potentiometers”. The 1st Amendment to CECC 41400 was implemented as Amendment No. 1 to this British Standard. 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
9、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 been used throughout as a decimal marker. In British Standards it is current practice to use a full point o
10、n 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 with the CENELEC Electronic Components Committee System” Part1 “Basic rules”. International Standard Corres
11、ponding British Standard CECC 41000:1976 BS CECC 41000:1977 Specification for harmonized 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
12、Basic environmental testing procedures Part 1.1:1977 General (Identical) IEC 68-2-6:1970 Basic environmental testing procedures Part 2.1Fc:1977 Test Fc. Vibration (sinusoidal) (Identical) IEC 68-2-13:1966 Basic environmental testing procedures Part 2.1M:1977 Test M. Low air pressure (Identical) IEC
13、68-2-14:1974 Basic environmental testing procedures Part 2.1N:1977 Test N. Change of temperature (Identical) IEC 68-2-20:1968 Basic environmental testing procedures Part 2.1Ta:1977 Test Ta. Solderability (Identical) IEC 68-2-27:1972 Basic environmental testing procedures Part 2.1Ea:1977 Test Ea. Sho
14、ck (Identical) IEC 68-2-29:1968 Basic environmental testing procedures Part 2.1Eb:1977 Test Eb. Bump (Identical)BSCECC41400:1980 BSI 09-1999 iii At present there is no corresponding British Standard for IEC393-1. IEC393-1 is referred to in the text for information only. A British Standard does not p
15、urport 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. Summary of pages This document comprises a front cover, an inside fron
16、t cover, pages i to iv, theCECCtitle page, pages ii to iv, pages 1 to 18, 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 amendment table on the inside front cover.iv blankBSCECC41400:198
17、0 ii BSI 09-1999 Contents Page Foreword iv Section 1. Scope 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 temperature coefficients of resistance 1 2.1.3 Limits for change in
18、 resistance, or output ratio 2 2.1.4 Limits for insulation resistance 2 2.1.5 Limits for resistance law 2 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 3 2.2.5 Isolation voltage 3 2.2.6 Degree of conformity 3 2.
19、2.7 Number of turns of the actuating device 3 2.2.8 Number of cycles of operation 3 2.2.9 Spindle rotational speed 3 2.3 Severities for environmental tests 3 2.3.1 Drying 3 2.3.2 Vibration 3 2.3.3 Bump 4 2.3.4 Shock 4 2.3.5 Low air pressure 4 2.3.6 Change of temperature 4 2.3.7 Soldering 4 2.4 Derat
20、ing curve 4 2.5 Information to be given in a detail specification 5 2.5.1 Style 5 2.5.2 Rated dissipation 5 2.5.3 Limiting element voltage 5 2.5.4 Isolation voltage 5 2.5.5 Resistance law and degree of conformity 5 2.5.6 Dimensions 5 2.5.7 Resistance range 6 2.5.8 Tolerances on rated resistance 6 2.
21、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 Soldering 7 2.5.16 Limits of resistance change after1000 h electrical endurance test 7 2.5.17 Starting torqu
22、e 7 2.5.18 Resolution 7BSCECC41400:1980 BSI 09-1999 iii Page 2.5.19 Number of turns of the actuating device 7 2.5.20 Limiting slider current 7 2.5.21 Terminal resistance and, where applicable, Residual resistance and minimum effective resistance 7 2.5.22 Derating curve 7 2.5.23 Mechanical endurance
23、7 2.5.24 Marking 7 2.5.25 Ordering information 7 2.5.26 Additional information 7 2.5.27 Measuring apparatus 8 Section 3. Inspection 8 3.1 Formation of inspection lots 8 3.2 Delayed delivery 8 3.3 Test methods 8 3.4 Apparatus for measuring mechanical accuracy 8 3.4.1 Dial indicator 8 3.4.2 Cylindrica
24、l spindle adapter 8 3.4.3 Potentiometer mounting fixture 9 3.4.4 Potentiometer spindle holding fixture 9 3.5 Qualification approval 9 Table 1 Preferred temperature characteristics and coefficients of resistance(non-wirewound potentiometers) 2BSCECC41400:1980 iv BSI 09-1999 Foreword The CENELEC Elect
25、ronic 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 international trade b
26、y 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 accepted by all member countries without further testing.
27、 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 ROTARY PRECISION POTENTIOMETERS. It should be read in conjunction with document CECC00100: Basic Rules (1974). At
28、 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 addressees shown on the inside cover. Preface This sectional spec
29、ification 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 Electrotechnical Commission and in particular on IEC Publication393-1: Potentiometers. Part1:Terms and met
30、hods of test. The text of this sectional specification was circulated to the CECC for voting in document CECC (Secretariat)306 in February1975 and was ratified by the CECC for printing as a CECC Specification. The text of Amendment 1 was circulated to the CECC for voting in the document indicated be
31、low and was ratified by the President of the CECC for printing: Document Voting date Report on the voting CECC (Secretariat) 868 January 1980 CECC (Secretariat) 974BSCECC41400:1980 BSI 09-1999 1 Section 1. Scope This sectional specification prescribes the preferred values for characteristics and rat
32、ings and also the inspection requirements for rotary precision 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 document are one or more blank
33、 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 performanc
34、e 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 The po
35、tentiometers 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 shall b
36、e 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 case, the
37、 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 characteristic of resistance are
38、given inTable 1. Each line in the tables gives the temperature coefficent and corresponding temperature characteristic for20to70 C and limits of change in resistance for the measurement of temperature characteristic of resistance (4.14 of CECC41000) on the basis of the category temperature ranges of
39、2.1.1 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 temperatures are required, they shall be called for in the de
40、tail specifications. Cold (Test A) 10 to 65 C Dry heat (Test B) + 70 to + 125 C Damp heat, steady state (Test C) 4 to 56 daysBSCECC41400:1980 2 BSI 09-1999 Table 1 Preferred temperature characteristics and coefficients of resistance (non-wirewound potentiometers) 2.1.3 Limits for change in resistanc
41、e, 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. NOTEThe paragraph numbers in the heading of the table refer to CECC41000. 2.1.4 Limits for in
42、sulation resistance The preferred limits for insulation resistance shall be1G7 minimum or, after humidity tests,100M7. 2.1.5 Limits for resistance law The measuring points and associated values of the output ratio for resistance laws shall be prescribed in the detail specification. Where requirement
43、s exist for forms of linearity as defined in AppendixC4 of CECC41000 these shall also be prescribed in the detail specification as shall any specific datum points. Temperature Coefficient 10 6 / C Percentage change in resistance 20/65 20/55 20/40 20/25 20/10 20/70 20/85 20/100 20/125 1000 8,5 7,5 6,
44、0 4,5 3,0 5,0 6,5 8,0 10,5 500 4,3 3,8 3,0 2,2 1,5 2,5 3,3 4,0 5,3 250 2,15 1,90 1,50 1,15 0,75 1,25 1,65 2,00 2,65 150 1,30 1,15 0,90 0,70 0,45 0,75 1,00 1,20 1,60 100 0,85 0,75 0,60 0,45 0,30 0,50 0,65 0,80 1,05 50 0,43 0,38 0,30 0,23 0,15 0,25 0,33 0,40 0,53 25 0,215 0,190 0,150 0,115 0,075 0,125
45、 0,165 0,200 0,265 10 0,085 0,075 0,060 0,045 0,030 0,050 0,065 0,080 0,105 4.28 4.29 4.30 4.32.2 4.32.3 Climatic sequence Damp heat, steady state Mechanical endurance Electrical endurance at70 C Electrical endurance atupper category temperature 4.24 Change of temperature 4.21 4.23.2 4.25 4.26 4.27
46、Robustness of terminations Resistance tosolder heat Vibration Bump Shock 4.20 Thrust and pull on spindle 4.24.3 Change of temperature 4.25.2 Vibration (where applicable) % % R/R between terminations a and c % % (SeeD4.9) (5 % + 0,1 7) (3 % + 0,1 7) (2 % + 0,1 7) 2 % 2 % (3 % + 0,1 7) (2 % + 0,1 7) (
47、1 % + 0,05 7) 1 % 1 % (2 % + 0,1 7) (1 % + 0,05 7) (0,5 % + 0,05 7) 0,5 % 0,5 % (1 % + 0,05 7) (0,5 % + 0,05 7) (0,25 % + 0,01 7) 0,25 % 0,25 % Vab Vac - Vab Vac -BSCECC41400:1980 BSI 09-1999 3 2.2 Ratings The values given in detail specifications shall preferably be selected from the following: 2.2
48、.1 Rated resistance See2.3.2 of CECC41000 2.2.2 Tolerances on rated resistance The preferred tolerances on rated resistance are: 10 %, 5 %, 3 %, 2 %, 1 %, and 0,5 % 2.2.3 Rated dissipation The preferred values of rated dissipation at70 C are: 0,125; 0,25; 0,5; 0,75; 1,0; 1,5; 2,0; 2,5; 4,0; and 6,3
49、W. 2.2.4 Limiting element voltage The preferred values of limiting element voltage are: 100, 160, 250, 400, 630 and 1000 V d.c. or a.c. r.m.s. 2.2.5 Isolation voltage The detail specification shall state the value of the isolation voltage, rounded up to the nearest10 V. The numerical value of the isolation voltage shall be no
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