《BS-9093-1979.pdf》由会员分享，可在线阅读，更多相关《BS-9093-1979.pdf（8页珍藏版）》请在三一文库上搜索。
1、BRITISH STANDARD BS 9093:1979 Rules for the preparation of Detail specifications for Variable pre-set capacitors, type C (Full assessment level) Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 04:27:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9093:1979 BSI
2、02-2000 ISBN 0 580 34369 3 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 pag
3、es This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 3 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. Amendments issued sin
4、ce publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 04:27:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9093:1979 BSI 02-2000i Contents Page 1Introduction1 2Scope1 3Dimensions and outline drawings1 4Ratings and characteristics1
5、 5Application notes1 6Drying1 7Descriptive code1 8Supplementary procedure for qualification approval1 9Inspection requirements2 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 04:27:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: London Sou
6、th Bank University, London South Bank University, Fri Dec 08 04:27:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9093:1979 BSI 02-20001 1 Introduction This British Standard gives the specific rules for the preparation of detail specifications for variable pre-set capacitors and should be read in
7、conjunction with BS 9090 “Variable capacitors of assessed quality: generic data and methods of test”. This issue of BS 9093 supersedes the publication dated December 1973. 2 Scope This British Standard prescribes those rules for drafting which, in conjunction with the general drafting rules containe
8、d in section 2 of BS 9090, are required for the preparation of detail specifications for variable pre-set capacitors of assessed quality, full assessment level. 3 Dimensions and outline drawings (see 1.2.3 of BS 9090) The detail specification shall prescribe for each pattern: dimensions. 4 Ratings a
9、nd characteristics The detail specification shall prescribe the ratings and characteristics in accordance with 1.1.12, 2.1.5 and 2.1.6 of BS 9090. The environmental category shall preferably be selected from the following list: 5 Application notes The detail specification shall include any informati
10、on concerning special mounting and locking arrangements. 6 Drying When drying is required before any test or measurement, the detail specification shall prescribe the following procedure: The capacitors shall be conditioned for 24 4 h in an oven at a temperature of 55 2 C and at a relative humidity
11、not exceeding 20 %. The capacitors shall then be allowed to cool to room temperature in a desiccator using a suitable desiccant, such as activated alumina or silica gel, and shall be kept therein from the time of removal from the oven to the beginning of the test. 7 Descriptive code The detail speci
12、fication shall include the appropriate descriptive code as described in 1.1.3 11) of BS 9090. 8 Supplementary procedure for qualification approval The procedure given in BS 9090: 1.1.10.2 may be invoked. If invoked, the minimum sample size for subgroup D1 shall be six specimens. 55/125/5625/085/21 5
13、5/085/5625/070/21 40/085/5610/070/04 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 04:27:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9093:1979 2 BSI 02-2000 9 Inspection requirements (see 2.2 of BS 9090) The variable capacitors covered by this specificati
14、on shall be tested to the inspection requirements given below. InspectionBS 9090:1977 reference Group A Subgroup A0 Sealing (normal conditioning) Voltage proof 1.2.6.9 1.2.4.5 To be applied on a sampling basis, lot-by-lot (except subgroup A0) 100 % inspection (Sealed types only) Subgroup A1 Visual e
15、xamination1.2.2 Inspection level I, AQL 1.5 % Subgroup A2 Capacitance1.2.4.1 Inspection level II, AQL 0.65 % Subgroup A3 Tangent of loss angle Insulation resistance 1.2.4.3 1.2.4.4 Inspection level I, AQL 1.5 % Subgroup A4 Operating torque1.2.5.1 Inspection level S-4, AQL 4 % Subgroup A5 CTR informa
16、tion1.1.11Attributes information for subgroups A2 and A3 Group B Subgroup B1 Not applicable To be applied on a sampling basis, lot-by-lot Subgroup B2 Robustness of terminations Solderability Climatic sequence 1.2.6.1 1.2.6.2 1) 1.2.6.7 Inspection level S-4, AQL 4 % Procedure 3 (this is applicable on
17、ly in the event of failure in subgroup C3) Subgroup B3 Thrust1.2.5.5.1 and 1.2.5.5.2 Inspection level S-4, AQL 4 % Subgroups B4, B5, B6, B7 and B8 Not applicable Subgroup B9 CTR information1.1.11Attributes information for subgroups B2 and B3 Group C Subgroup C1 Dimensions Temperature coefficient Cap
18、acitance drift 1.2.3 1.2.4.7 1.2.4.8 To be applied on a sampling basis at intervals of 3 months Inspection level S-3, AQL 6.5 % Subgroup C2 Locking Locking torque proof End stop torque 1.2.5.2 1.2.5.3 1.2.5.4 ) ) ) Inspection level I, AQL 1.5 % If a locking device is fitted If end stops are fitted L
19、icensed Copy: London South Bank University, London South Bank University, Fri Dec 08 04:27:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9093:1979 BSI 02-20003 InspectionBS 9090:1977 reference Subgroup C3 Damp heat, steady state1.2.6.8 Inspection level S-4, AQL 4 % Subgroup C4 and C5 Not applicab
20、le Subgroup C6 CTR information1.1.11 Attributes information for subgroups C1 and C3 Group D Subgroup D1 To be applied on a sampling basis at intervals of 3 years Inspection level S-3, AQL 6.5 % (13 specimens minimum) 1) Resistance to soldering heat followed by 1.2.6.2 2) ) ) ) Subgroup D1 1) and D1
21、2) each comprise 50 % of the specimens Robustness of terminations 2) Bump followed by Vibration and Rapid change of temperature 3) Climatic sequence 1.2.6.1 1.2.6.3 1.2.6.5 1.2.6.6 1.2.6.7 ) ) ) ) ) ) ) If there is an odd number of specimens then subgroup D1 2) should contain the larger number The t
22、wo sets of specimens are combined for subgroup D1 3) Subgroup D2a) Endurance electrical1.2.7.2 Inspection level S-4, AQL 4 % (Non-air dielectric types) Subgroup D2b) Endurance mechanical1.2.7.1 Inspection level S-4, AQL 4 % Subgroup D3 Sealing (extended conditioning) 1.2.6.10 Inspection level S-4, A
23、QL 4 % (Sealed types only) Subgroup D4 Not applicable Subgroup D5 CTR information1.1.11Attributes information for subgroups D1 and D3 Measurements information for subgroups D2a) and D2b) Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 04:27:32 GMT+00:00 2006, Un
24、controlled Copy, (c) BSI BS 9093:1979 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Roya
25、l Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an i
26、naccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: 020 8996 9000. Fax: 020 8996 7400. BSI offers members an individual updating service called PLUS which ensure
27、s that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: 020 8996 9001. Fax: 020 8996 7001. In response to orders for international standards, it is
28、BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters
29、Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel: 020 8996 7111. Fax: 020 8996 7048. Subscribing members of BSI are kept up to date with standards developments and receive substantial disc
30、ounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel: 020 8996 7002. Fax: 020 8996 7001. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the international standar
31、dization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopying, recording or otherwise without prior written permission from BSI. This does not precl
32、ude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel: 020 8996 7070. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 04:27:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI