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1、BRITISH STANDARD BS 9131:1973 Rules for the preparation of Detail specifications for Lead-screw actuated preset potentiometers of assessed quality Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:22:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9131:1973 BS
2、I 02-2000 ISBN 0 580 34379 0 Foreword This British Standard, which has been prepared under the authority of the Telecommunication Industry Standards Committee gives the specific rules for the preparation of detail specifications for lead-screw actuated pre-set potentiometers of assessed quality and
3、should be read in conjunction with Section 2 of BS 9130 “Potentiometers of assessed quality: Generic data and methods of test”. It has been issued in the United Kingdom, where it is urgently required but if a similar procedure is adopted in other countries changes will be considered for the purposes
4、 of harmonization. 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. Summary of pages This
5、document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 6, an inside back cover 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. Amendme
6、nts issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:22:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9131:1973 BSI 02-2000i Contents Page ForewordInside front cover 1Scope1 2Dimensions and outline drawings1 3Ra
7、tings and characteristics1 4Drying2 5Additional terminology2 6Ordering information2 7Inspection requirements2 Appendix A Layout of a proposal to add to a dimensional appendixInside back cover Table 1 Schedule for full assessment2 Licensed Copy: London South Bank University, London South Bank Univers
8、ity, Fri Dec 08 02:22:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:22:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9131:1973 BSI 02-20001 1 Scope This British Standard prescribes those special rule
9、s for drafting which, in conjunction with the general rules contained in Section 2 of BS 9130, are required for the preparation of detail specifications for wirewound and non-wirewound lead-screw actuated pre-set potentiometers of assessed quality. It also contains provision whereby an approved manu
10、facturer may propose amendments to published detail specifications which have been prepared by a BSI Technical Committee. 2 Dimensions and outline drawings 2.1 The detail specification shall prescribe those dimensions which are suitable for gauging. These shall normally comprise the following: 1) Le
11、ngth. 2) Height1). 3) Width1). 4) Fixing hole dimensions. 5) Location of terminations. 6) Position and dimensions of actuator. 2.2 The detail specification shall contain an appendix giving the drawing of the potentiometer with full detail dimensions and number of effective operating turns, where it
12、is not feasible to give this information on the front cover. It shall also identify the normal mounting means. An approved manufacturer may seek approval of a lead-screw potentiometer which conforms to a detail specification prepared by the BSI committee but does not conform to any of the styles con
13、tained in such a dimensional appendix. At the time of submission for qualification approval the manufacturer shall apply for a style-number to be given by BSI to his own drawing of the product. Such a submission shall comply with the provisions of 2.2.1 below. Where qualification approval is granted
14、 for this product the manufacturer shall issue an A4 size sheet showing his drawing with the style-number (including the BS number) to which qualification approval has been granted and his name and address. Copies of this sheet shall be made available in the same way as a manufacturers detail specif
15、ication. 2.2.1 Any style to be included shall comply in every respect with the ratings and characteristics and inspection requirements of the published detail specification. Where a number of rated dissipations, constructions and climatic categories appear in the publication, the proposal shall iden
16、tify: 1) Rated dissipation at 70 C. 2) Nature of the resistive element (i.e. wirewound or non-wirewound). 3) Climatic category. 4) Dimensional details. 5) Normal mounting means. In respect of 4) above, a detail drawing shall be given, which is fully dimensioned in accordance with the scheme shown in
17、 Appendix A. This drawing shall be based on an existing dimensional outline. Those dimensions (and operating turns) which are different shall be identified. 2.3 Where, for technical or editorial convenience, a number of detail specifications are published together as a single document, e.g. BS 9131
18、N001 to N016, that document will include a selection chart identifying the dimensional outlines available within each detail specification. An approved manufacturer may propose for inclusion in that chart a combination of dimensional outline and detail specification number (i.e a style) which was no
19、t previously available. Only those dimensional outlines already referred to in the chart are available for this purpose. The acceptance of such a proposal is subject to the submission by the manufacturer of authenticated test results, and full information in respect of the proposed style. 3 Ratings
20、and characteristics (See 1.1.12 and 2.1.5 of BS 9130) 3.1 Standard values of resistance shall be selected from 1.0 : 2.2 : 4.7 in each decade (i.e. alternate numbers in the E6 series of BS 2488 (IEC 63). See 1.1.12 1) of BS 9130). 3.2 Standard values of selection tolerance shall be chosen from the f
21、ollowing list: 2 %, 5 %, 10 %, 20 %, and 30 % 3.3 Standard values of limiting element voltage shall be chosen from the following list: 100, 125, 160, 200, 250, and 315 V. 3.4 Standard values of isolation voltage see 1.1.12 4) of BS 9130. 3.5 Standard values of rated dissipation shall be selected fro
22、m the following list: 0.125, 0.25, 0.5, 0.75, 1 and 2 W. 3.6 The potentiometers covered by this rules document are classified into climatic categories according to the general rules given in Appendix A of BS 2011-1. 1) In the case of a cylindrical component, the diameter shall be indicated. Licensed
23、 Copy: London South Bank University, London South Bank University, Fri Dec 08 02:22:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9131:1973 2 BSI 02-2000 The standard severities for the cold, dry heat and damp heat, steady state tests are within the following ranges: Test A: 10 to 55 C. Test B: 1
24、00 to 155 C. Test C: 04 to 56 days. Values selected within these ranges shall be chosen from the relevant tests of BS 2011-2. 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
25、of the preferred temperatures given in BS 2011-2. In this case, the nearest preferred temperature within the category temperature range of the potentiometer shall be chosen for this severity. 3.7 Preferred severities for environmental tests shall be selected from those given in 1.1.12.7 of BS 9130.
26、3.8 Standard values of temperature characteristic of resistance over the range 20 C to 70 C selected from the list in 1.1.12 8) of BS 9130 are as follows. (Equivalent temperature coefficients of resistance are shown in parentheses). 3.9 A statement of derating or a derating curve shall be given whic
27、h shall be as shown in 2.1.5.2 of BS 9130. 3.10 The number of effective operating turns shall be stated in the detail specification and shall preferably be selected from the following nominal values: 12, 15, 20, 22 and 25. 4 Drying When drying is required the detail specification shall call for Proc
28、edure I of 1.2.4.1 of BS 9130. 5 Additional terminology The detail specification shall include the following terms: 5.1 Lead-screw actuated potentiometers. Those potentiometers which have a multi-turn actuating device which is insulated from the moving contact and from the resistance element. 5.2 Ef
29、fective operating turns. The number of turns which are required on the actuating device to move the moving contact across the resistance element between the points at which terminal resistance is measured. 5.3 Slipping clutch. That form of construction which allows continuous rotation of the actuati
30、ng device after the moving contact has reached either end of the resistance element. 6 Ordering information The detail specification shall require that the information listed in 1.1.15 of BS 9130 shall be given when potentiometers conforming to the specification are ordered. 7 Inspection requirement
31、s (See 2.2 of BS 9130) 7.1 Where a subgroup contains more than one test, the tests shall be carried out in the order given in the schedule. 7.2 Samples submitted to tests which are marked “(D)” shall not be accepted for release under BS 9000 (see 2.6.5 of BS 9000-1). 7.3 The data in Table 1 shall be
32、 given for Groups A, B, C and D inspection requirements, and shall be applicable to each individual style. Table 1 Schedule for full assessment + 0.25 to 0.25 % (+ 50to 50p.p.m./C) + 0.5to 0.5% (+ 100 to 100p.p.m./C) + 0.75 to 0.75 % (+ 150 to 150p.p.m./C) + 2.50 to 2.50 % (+ 500 to 500p.p.m./C) + 0
33、.00 to 5.00 % (+ 0to 1 000 p.p.m./C) InspectionBS 9130 reference and conditions of test Group A Subgroup A0 Resistance a to c1.2.4.3.2 To be applied on a sampling basis lot-by-lot (with the exception of subgroup A0). Subgroups A3 and A4 are not applicable 100 % inspection Subgroup A1 Visual inspecti
34、on1.2.2 Inspection level I, AQL 1.5 % Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:22:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9131:1973 BSI 02-20003 Table 1 Schedule for full assessment InspectionBS 9130 reference and conditions of test Subgroup A
35、2 Resistance a to b b to c Continuity Rotational noise Voltage proof 1.2.4.3.3 1.2.4.3.4 1.2.4.2 1.2.4.13.2 1.2.4.10 Inspection level S-4, AQL 4.0 % Subgroup A5 CTR information1.1.11Attributes information for subgroup A2 without reference to the parameter for which rejection was made Group B Subgrou
36、p B1 Dimensions (gauging) Effective operating turns 1.2.3.1 To be applied on a sampling basis lot-by-lot. Subgroups B3 to B7 are not applicable Inspection level S-2, AQL 4.0 % Effective operating turns (see 5.2 of this document) shall be measured Subgroup B2 (D)Inspection level S-2, .AQL 4.0 % Poten
37、tiometers with different types of termination shall not be considered as being structurally similar for the purpose of this subgroup. Different termination configurations e.g. in-line or staggered, may be considered as structurally similar Robustness of terminations Measurements Visual examination R
38、esistance Solderability Measurements Visual examination Sealing (where applicable) Mechanical endurance Final measurements 1) Visual examination 2) Resistance 5) Starting torque 9) Rotational noise, Method B 1.2.6.1 1.2.6.3.2 1.2.6.2.2 1.2.7.1 Tensile and bending Test Qc Method II; 8590 C Room tempe
39、rature, no load, 200 cycles, at 4 1 cycles per minute Subgroup B8 CTR information1.1.11Attributes information for subgroup B2, without reference to the parameter for which rejection was made. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:22:43 GMT+00:00 200
40、6, Uncontrolled Copy, (c) BSI BS 9131:1973 4 BSI 02-2000 Table 1 Schedule for full assessment InspectionBS 9130 reference and conditions of test Group C Subgroup C1 Starting torque Thrust and pull Measurements Resistance Slipping clutch 1.2.5.1 1.2.5.5.3 1.2.5.3.2 To be applied on a sampling basis,
41、at three-monthly intervals. Subgroup C5 is not applicable Sample size 13. Accept 1/Reject 2 Pull not applicable Subgroup C2 Temperature characteristic of resistance 1.2.4.12 Sample size 13. Accept 1/Reject 2 20 C to 70 C cycle only Subgroup C3 (D) (i) Robustness of terminations Measurements Visual e
42、xamination Resistance 1.2.6.1 Sample size 13. Accept 2/Reject 3 7 specimens Resistance to soldering heat Measurements Resistance a to c Resistance a to b Resistance b to c 1.2.6.3.3 (ii) Change of temperature Measurements Voltage ratio Resistance Bump Measurement Resistance Vibration Measurements Vo
43、ltage ratio Resistance 1.2.6.4 1.2.6.6 1.2.6.5 Remaining 6 specimens (iii) Climatic sequence Final measurements 1) Starting torque (cold) 2) Voltage proof (low air pressure) 3) Isolation voltage 1.2.6.8 Specimens from (i) and (ii) combined Procedure 1 of BS 2011-2 Z/ABDM Licensed Copy: London South
44、Bank University, London South Bank University, Fri Dec 08 02:22:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9131:1973 BSI 02-20005 Table 1 Schedule for full assessment InspectionBS 9130 reference and conditions of test Subgroup C3 (iii) (Contd) 4) a Visual examination b Resistance a to c c Insu
45、lation resistance e Continuity f Starting torque g Voltage proof 5) Insulation resistance (/21 day components only) Subgroup C4 (D) Electrical endurance (at 70 C) Final measurements 1) Visual examination 2) Resistance 3) Insulation resistance 4) Rotational noise, Method B 5) Continuity 1.2.7.4 Sampl
46、e size 13. Accept 1/Reject 2 1 000 h duration Subgroup C6 CTR information1.1.11Attributes information shall be given for subgroups C1, C2, and C3 without reference to the parameter for which rejection was made. Measurements information shall be given for the change of resistance in subgroup C4 Group
47、 D Subgroup D1 (D) Damp heat, steady state After conditioning Isolation voltage Final measurements 1) Visual examination 2) Resistance 3) Insulation resistance 5) Continuity 6) Starting torque 7) Rotational noise, Method B 8) Voltage proof After extended recovery Insulation resistance (/21 day compo
48、nents only) 1.2.6.9 To be applied on a sampling basis, at three-yearly intervals Sample size 13, Accept 1/Reject 2 Subgroup D2 (D) Electrical endurance (at upper category temperature) Final measurements 1) Visual examination 2) Resistance 1.2.7.5 Sample size 13. Accept 1/Reject 2 1 000 h duration Li
49、censed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:22:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9131:1973 6 BSI 02-2000 Table 1 Schedule for full assessment InspectionBS 9130 reference and conditions of test Subgroup D3 Temperature characteristics of resistance 1.2.4.12 Sample size 13, Accept 1/Reject 2 Subgroup D4 Dimensions (detail)1.2.3.2 Sample size 13, Accept 1/Reject 2 Subgroup D5 Electrical endurance at 70 C1.2.7.4 Sample size 13, For CTR purposes only 8