BS-5786-1-1979 IEC-60418-1-1974.pdf
《BS-5786-1-1979 IEC-60418-1-1974.pdf》由会员分享,可在线阅读,更多相关《BS-5786-1-1979 IEC-60418-1-1974.pdf(28页珍藏版)》请在三一文库上搜索。
1、BRITISH STANDARD BS 5786-1: 1979 IEC 418-1: 1974 Incorporating Amendment No. 1 Variable capacitors Part 1: Methods of test UDC 621.318.43 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 12:57:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5786-1:1979 This British Standard, having been prepa
2、red under the direction of the Electronic Components Committee, was published under the authority of the Executive Board and comes into effect on 31 October 1979 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference ECL/4 Draft for comment 79/21700 DC ISBN
3、 0 580 10933 X Cooperating organizations 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 Electricit
4、y Supply Industry in England 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
5、 Association (TEMA) 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: British Broadcasting Corporation Electrical Research Association Amendments issued since p
6、ublication Amd. No.Date of issueComments 4030September 1982 Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 12:57:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5786-1:1979 BSI 01-2000i Contents Page Cooperating organizationsInside front cover National
7、forewordii Section 1. General 1Scope1 2Object1 3Terminology1 Section 2. General requirements for tests 4Test conditions5 Section 3. Methods of test 5Visual examination5 6Dimensions and effective angle of rotation6 7Capacitance6 8Blacklash8 9Tangent of the loss angle8 10Insulation resistance8 11Volta
8、ge proof9 12Rotor contact resistance9 13Temperature coefficient9 14Capacitance drift10 15Operating torque11 16Locking11 17Locking torque proof11 18End stop torque11 19Thrust and pull (axial)12 20Side thrust12 21Robustness of terminations13 22Rapid change of temperature13 23Soldering13 24Impact14 25V
9、ibration15 26Climatic sequence15 27Damp heat (steady state)16 28Corrosion17 29Endurance17 30Sealing (normal conditioning)18 31Sealing (extended conditioning)18 32Capacitance drift after adjustment19 Figure 1 Illustration of capacitance measuring positions7 Publications referred toInside back cover L
10、icensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 12:57:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5786-1:1979 ii BSI 01-2000 National foreword This British Standard has been prepared under the direction of the Electronic Components Standards Committee. It is identical with International E
11、lectrotechnical Commission Publication IEC 418-1:1974 “Variable capacitors. Part 1. Terms and methods of test”. Amendment No. 1 (1976) to IEC 418-1:1974 has been incorporated in the text of this standard. Terminology and conventions. The text of the International Standard has been approved as suitab
12、le 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. Wherever the word “recommendation” appears, referring to this standard, it should be read as
13、“British Standard”. Cross-references International StandardCorresponding British Standard ISO 3:1973BS 2045:1965 Preferred numbers (Technically equivalent) IEC 68-1:1968BS 2011 Basic environmental testing procedures Part 1.1:1977 General (Identical) IEC 68-2-1:1974BS 2011 Basic environmental testing
14、 procedures Part 2.1A:1977 Test A. Cold (Identical) IEC 68-2-2:1974BS 2011 Basic environmental testing procedures Part 2.1B:1977 Test B. Dry heat (Identical) IEC 68-2-3:1969BS 2011 Basic environmental testing procedures Part 2.1Ca:1977 Test Ca. Damp heat, steady state (Identical) IEC 68-2-4:1960BS 2
15、011 Basic environmental testing procedures Part 2.1Da:1977 Test Da. Accelerated damp heat (Identical) IEC 68-2-6:1970BS 2011 Basic environmental testing procedures Part 2.1Fc:1977 Test Fc. Vibration (sinusoidal) (Identical) IEC 68-2-13:1966BS 2011 Basic environmental testing procedures Part 2.1M:197
16、7 Test M. Low air pressure (Identical) IEC 68-2-14:1974BS 2011 Basic environmental testing procedures Part 2.1N:1977 Test N. Change of temperature (Identical) IEC 68-2-17:1968BS 2011 Basic environmental testing procedures Part 2.1Q:1977 Test Q. Sealing (Identical) IEC 68-2-20:1968 b) their ability t
17、o withstand specified conditions of mechanical shock such as are to be expected under transit or operational conditions; c) their ability to withstand the rigours of normal assembly processes (e.g. soldering) attendant on their incorporation in equipments, without detriment to a) and b) above. Some
18、tests in this recommendation are accelerated tests or tests under conditions which may represent or even exceed the most severe conditions of use. Such tests establish arbitrary standards of quality and they cannot be held to give positive information of any performance beyond or outside the test pe
19、riods and test conditions. Where the required operating conditions differ materially from the test conditions specified herein, reference should be made to the manufacturers regarding the suitability of a component for a particular purpose. In general, longer periods of life for a given performance
20、limit may be expected where the environment or loading imposes a less severe stress on the component. The tests described in this recommendation are applicable to each section of multi-section capacitors, unless otherwise specified in the relevant specification. 3 Terminology For the purposes of thi
21、s recommendation the following definitions shall apply: 3.1 variable capacitor a capacitor which is designed to enable the capacitance to be varied continuously over its complete range 3.2 differential capacitor a capacitor comprising two isolated stators which are operated with one rotor, arranged
22、so that as the capacitance between the rotor and one stator increases, the capacitance between the rotor and the other stator decreases, but the sum of the two capacitance values remains substantially constant at all settings 3.3 split stator capacitor a capacitor comprising two isolated stators whi
23、ch function in series with a common rotor 3.4 section a stator and its corresponding rotor 3.5 multi-section capacitor a capacitor which has several sections, the capacitance values of which are varied simultaneously by a common actuating device Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04
24、 12:57:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5786-1:1979 2 BSI 01-2000 3.6 reference section that section to which other sections are matched 3.7 matching section a section matched to a reference section 3.8 Type Is determined by the function and is governed by the ability of the capacito
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- BS-5786-1-1979 IEC-60418-1-1974 BS 5786 1979 IEC 60418 1974
链接地址:https://www.31doc.com/p-3771708.html