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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
25、r to withstand various severities of mechanical endurance (see Sub-clause 29.1). 3.8.1 type A a capacitor which is intended to be operated frequently throughout its life. When used for tuning purposes, this capacitor may be provided with a control spindle to which a knob or drive may be fitted 3.8.2
26、 type B a capacitor used for trimming or for other similar purposes, where the amount and duration of movement of the rotatable electrode is considerably less than that of Type A 3.8.3 type C a capacitor used specifically as a pre-set capacitor where a comparatively small number of movements are req
27、uired during its life 3.9 Style The method of varying the capacitance. 3.9.1 style 1 concentric an air dielectric capacitor where the capacitance can be varied by the axial movement of a rotor in a stator 3.9.2 style 2 vane a capacitor where the capacitance can be varied by rotating the rotor vanes
28、between the stator vanes 3.9.3 style 3 tubular a solid dielectric capacitor where the capacitance can be varied by the axial movement of an electrode within a tube 3.9.4 style 4 compression a capacitor where the capacitance can be varied by compressing a stack of electrode and dielectric layers 3.9.
29、5 style 5 disk a solid dielectric capacitor where the capacitance can be varied by rotating a metal or metallized disk Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 12:57:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5786-1:1979 BSI 01-20003 3.10 descriptive code the description of the t
30、ype (function), dielectric, style and application of a capacitor may be in the form of a four character code as follows: Example: For a pre-set capacitor, solid dielectric, tubular style, for professional application, the descriptive code is C231. 3.11 maximum capacitance the value which is obtained
31、 with the actuating device adjusted in the manner prescribed in the relevant specification 3.12 minimum capacitance the value which is obtained with the actuating device adjusted in the manner prescribed in the relevant specification 3.13 capacitance swing the difference between maximum and minimum
32、capacitance values 3.14 capacitance law the relationship between capacitance and the position of the actuating device 3.15 effective angle of rotation the angle (or number of turns) through which the rotor moves between the positions of maximum and minimum capacitance 3.16 total angle of rotation th
33、e angle (or number of turns) through which the rotor moves between the end stops. If there are no end stops, then the total angle of rotation is the effective angle of rotation 3.17 nominal angle of rotation the angle used for determining the measuring points when capacitance law measurements are ma
34、de 3.18 backlash the difference in capacitance (expressed as a ratio) obtained at a specified measuring angle when the actuating device is moved to approach this measuring angle from a clockwise and then from an anti-clockwise direction Descriptive code Type (function) C231 C A = Tuning capacitor B
35、= Trimmer capacitor C = Pre-set capacitor Dielectric 2 1 = Air 2 = Solid Style 3 1 = Concentric 2 = Value 3 = Tubular 4 = Compression 5 = Disk Application1 1 = Grade 1 professional 2 = Grade 2 domestic Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 12:57:40 GMT+00:00 2006, Uncontrolled Copy,
36、 (c) BSI BS 5786-1:1979 4 BSI 01-2000 3.19 apparent power the maximum VA rating at which the capacitor can be used in relation to temperature rise, in terms of frequency, current and voltage 3.20 lower category temperature the lowest ambient temperature at which the capacitor is designed to operate
37、continuously 3.21 upper category temperature the highest ambient temperature at which the capacitor is designed to operate continuously 3.22 category temperature range the range of ambient temperatures for which the capacitor is designed to operate continuously 3.23 capacitance drift after adjustmen
38、t the change in capacitance (expressed as a ratio) obtained in a stated time after the actuating device has been rotated at a specified speed to a stated capacitance 3.24 nominal capacitance those values which are indicated upon the capacitor or the package. These will be defined in the relevant spe
39、cification and will comprise one or more of the following: Capacitance swing (nominal), Maximum capacitance (nominal), Minimum capacitance (nominal). 3.25 rated voltage the maximum peak voltage which may be applied continuously to the terminals of a capacitor at any temperature in the category tempe
40、rature range NOTERated voltages shall be selected from the R5 series given in ISO/R3. Where intermediate values are required, these shall be chosen from the R10 series. 3.26 rotor contact resistance the resistance between the rotor contact terminal and the rotor shaft 3.27 type tests the complete se
41、ries of tests to be carried out on a number of specimens which are representative of the type, with the object of determining whether a particular manufacturer can be considered to be able to produce products meeting the specification 3.28 type approval the decision by the proper authority (the user
42、 himself or his nominee) that a particular manufacturer can be considered to be able to produce in reasonable quantities the products meeting the specification 3.29 acceptance tests tests carried out to determine the acceptability of a consignment on the basis of an agreement between user and manufa
43、cturer. The agreement shall cover: a) the sample size; b) the selection of tests; Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 12:57:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5786-1:1979 BSI 01-20005 c) the extent to which the test specimens shall conform to the requirements for the
44、 selected tests of the specification. NOTEWhen differing test results are obtained by user and manufacturer, the IEC standard methods shall be used for referee purposes. 3.30 factory tests those tests carried out by the manufacturer to verify that his product meets the specification Section 2. Gener
45、al requirements for tests 4 Test conditions The method specified initially for any test or measurement shall, unless otherwise specified, be used for all subsequent applications of that test or measurement. For measurements of capacitance, the measuring method shall be such that the error does not e
46、xceed: a) 10 % of the rated capacitance tolerance for absolute capacitance measurements; b) 10 % of the specified maximum capacitance change for measurements of capacitance change. Where a test requires an application of torque, the method used shall be such as to ensure an accuracy of 10 %. 4.1 Sta
47、ndard atmospheric conditions for testing Measurements on capacitors shall, unless otherwise specified, be carried out under standard atmospheric conditions for testing as specified in IEC Publication 68-1, Basic Environmental Testing Procedures, Part 1, General, within the times stated. During these
48、 measurements, the test samples shall be protected from draughts and direct sun-rays. Where measurements are required during conditioning periods, the same requirement shall apply unless otherwise specified. 4.2 Methods of mounting If the method of mounting is important, the relevant specification s
49、hall prescribe which of the following methods of mounting shall be used: Method A. The capacitor shall be rigidly mounted by the means provided, without causing abnormal stressing. Method B. The capacitor shall be rigidly mounted by the means provided and without causing abnormal stressing, on a flat machined metal plate approximately 3 mm thick and at least 25 mm larger than the linear dimensions of the mounting face of the capacitor. Method C. The capacitor shall be rigidly mounted by the means