BS 5772-4-1979 Specification for electromechanical components for electronic equipment basic testing procedures and measuring methods - Dynamic stress tests《电子设备用机电元件规范 基本试验规程和测量方法.pdf

1、BRITISH STANDARD BS 5772-4: 1979 IEC 512-4: 1976 Specification for Electromechanical components for electronic equipment:basic testing procedures and measuring methods Part 4: Dynamic stress tests UDC 621.316.54.00.4:620.178.3/.5BS5772-4:1979 This British Standard, having been prepared under the dir

2、ectionof the Electronic Components Standards Committee, was published underthe authority of the Executive Board and comes intoeffect on 30 November 1979 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference ECL/21 Draft for comment 78/27026 DC ISBN 0 580 1

3、1056 7 Cooperating organizations The Electronic Components Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following Government department and scientific and industrial organizations: British Electrical and Allied Manufacturers Asso

4、ciation (BEAMA) Electricity Supply Industry in England and Wales* Electronic Components Industry Federation* Electronic Engineering Association Institution of Electronic and Radio Engineers Ministry of Defence* National Supervising Inspectorate* Post Office* Society of British Aerospace Companies Li

5、mited* Telecommunication Engineering and Manufacturing Association (TEMA) The organizations marked with an asterisk in the above list were directly represented on the committee entrusted with the preparation of this British Standard. Amendments issued since publication Amd. No. Date of issue Comment

6、sBS5772-4:1979 BSI 09-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii Scope 1 1 Test 6a: Acceleration, steady state 1 2 Test 6b: Bump 2 3 Test 6c: Shock 2 4 Test 6d: Vibration 3 Publications referred to Inside back coverBS5772-4:1979 ii BSI 09-1999 National for

7、eword This Part of this British Standard, published under the direction of the Electronic Components Standards Committee, is identical with IEC Publication 512-4 “Electromechanical components for electronic equipment; basic testing procedures and measuring methods Part 4: Dynamic stress tests” publi

8、shed by the International Electrotechnical Commission (IEC). It should be read in conjunction with Part 1 “General” of BS5772(IEC 512) which contains information on fundamental test methods and procedures to be employed in implementing the requirements of this standard. Terminology and conventions.

9、The text of the International Standard has been approved as suitable for publication, without deviation, as a British Standard. Some terminology and certain conventions are not identical with those used in British Standards. Additional information. The scope of this British Standard is as given in B

10、S5772-1:1979. Part 4 of this standard prescribes the acceleration, steady state, bump, shock and vibration tests. 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 Bri

11、tish Standard does not of itself confer immunity from legal obligations. Cross-references International Standard Corresponding British Standard IEC 68-2-6:1970 BS 2011 Basic environmental testing procedures Part 2.1Fc:1977 Test Fc Vibration (sinusoidal) (Identical) IEC 68-2-7:1968 Part 2.1Ga:1977 Te

12、st Ga. Acceleration, steady state (Identical) IEC 68-2-27:1972 Part 2.1Ea:1977 Test Ea. Shock (identical) IEC 68-2-29:1968 Part 2.1Eb:1977 Test Eb. Bump (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 4, an inside back cover and a

13、 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.BS5772-4:1979 BSI 09-1999 1 Scope The tests contained herein, when required by the detail specification, shall be used fo

14、r electromechanical components within the scope of Technical Committee No. 48. 1) They may also be used for similar devices when specified in a detail specification. 1 Test 6a: Acceleration, steady state 1.1 Object The object of this test is to detail a standard test method to assess the ability of

15、components to withstand specified severities of acceleration. 1.2 Mounting of specimen The specimen shall be mounted as specified in the detail specification. 1.3 General requirements 1.3.1 This test shall be conducted in accordance with IEC Publication 68-2-7, Basic Environmental Testing Procedures

16、, Part 2: Tests Test Ga:Acceleration, Steady State, using the degree of severity specified in the detail specification. 1.3.2 Unless otherwise specified, each specimen shall be wired according to the manufacturers instructions. 1.3.3 Specimens shall be tested in a manner such that all mechanical fea

17、tures, such as panel-mounting arrangements, locking and retaining devices, are fully utilized. 1.3.4 The measurements specified in Sub-clause1.4 shall be carried out prior to the test, except those which have been carried out during the final measurements of the preceding test. 1.4 Testing requireme

18、nts 1.4.1 Contacts shall be monitored continuously during this test. Unless otherwise specified in the detail specification, during the test monitoring of the electrical continuity shall be carried out on contacts and screen, where fitted, connected in series. 1.4.2 At the conclusion of the test, th

19、e specimen shall be subjected to the following tests unless otherwise specified in the detail specification: 1.4.2.1 Visual examination The specimen shall be visually examined without dismantling. There shall be no loosening, displacement of parts or mechanical damage such as to impair operation. 1.

20、4.2.2 Operational check The mechanical operational characteristics shall be checked according to the detail specification. 1.4.2.3 Contact resistance The contact resistance shall be measured in accordance with the detail specification and shall not exceed the maximum specified value. 1.4.2.4 Sealing

21、 The specimen shall be subjected to the sealing test specified in the detail specification. Leakage rate across all seals, including panel seals, shall be not greater than specified in the detail specification. 1.5 Details to be specified When this test is required by the detail specification, the f

22、ollowing details shall be specified in addition to those specified in Test Ga of IECPublication68-2-7: a) method of mounting specimen and associated cable(s)/wire bundle, including the unsupported length of cable from contact to first clamp; b) severity, acceleration level; c) severity, duration; d)

23、 axes and direction of acceleration; e) type of cable/wire bundle, its size and length; f) operational characteristics to be checked (both during and after acceleration); g) applicable electrical continuity test method, contact resistance test method and the contacts to be monitored (in the case of

24、switches, the operating conditions) and requirements; and h) any deviation from the standard test method and/or conditions. 1) Scope of Technical Committee No. 48: To prepare International Standards regarding components having an inherent electromechanical connecting or switching function, intended

25、for use in equipment for telecommunication and in electronic devices employing similar techniques. NOTE 1R.F. connectors will not be dealt with by this Technical Committee as they will be covered by Technical Committee No. 46 together with r.f. cables. NOTE 2Sockets for components such as crystals o

26、r electronic tubes shall be considered in co-operation with the relevant Technical Committee.BS5772-4:1979 2 BSI 09-1999 2 Test 6b: Bump 2.1 Object The object of this test is to detail a standard test method to assess the ability of components to withstand specified severities of bump. 2.2 Mounting

27、of specimen The specimen shall be mounted as specified in the detail specification. 2.3 General requirements 2.3.1 This test shall be conducted in accordance with IEC Publication68-2-29, Test Eb: Bump, using the degree of severity specified in the detail specification. 2.3.2 Unless otherwise specifi

28、ed, each specimen shall be wired according to the manufacturers instructions. 2.3.3 Specimens shall be tested in a manner such that all mechanical features, such as panel-mounting arrangements, locking and retaining devices, are fully utilized. 2.3.4 The measurements specified in Sub-clause2.4 shall

29、 be carried out prior to the test, except those which have been carried out during the final measurements of the preceding test. 2.4 Testing requirements 2.4.1 Unless otherwise specified in the detail specification, during the last 200 bumps monitoring of the electrical continuity shall be carried o

30、ut on contacts and screen, where fitted, connected in series. 2.4.2 At the conclusion of the test, the specimen shall be subjected to the following tests unless otherwise specified in the detail specification: 2.4.2.1 Visual examination The specimen shall be visually examined without dismantling. Th

31、ere shall be no loosening, displacement of parts or mechanical damage such as to impair operation. 2.4.2.2 Operational check The mechanical operational characteristics shall be checked according to the detail specification. 2.4.2.3 Contact resistance The contact resistance shall be measured in accor

32、dance with the detail specification and shall not exceed the maximum specified value. 2.4.2.4 Sealing The specimen shall be subjected to the sealing test specified in the detail specification. Leakage rate across all seals, including panel seals, shall not be greater than specified in the detail spe

33、cification. 2.5 Details to be specified When this test is required by the detail specification, the following details shall be specified in addition to those specified in Test Eb of IECPublication68-2-29: a) type of cable/wire bundle, its size, length and method of mounting, including the unsupporte

34、d length of cable from contact to first clamp; b) operational characteristics to be checked; c) contacts to be monitored (or other characteristics appropriate to the particular component); d) contact resistance test method(s) to be used; e) any deviation from the standard test method and/or conditio

35、ns. 3 Test 6c: Shock 3.1 Object The object of this test is to detail a standard test method to assess the ability of components to withstand specified severities of shock. 3.2 Mounting of specimen The specimen shall be mounted as specified in the detail specification. 3.3 General requirements 3.3.1

36、This test shall be conducted in accordance with IEC Publication68-2-27, Test Ea: Shock, using the pulse shape and degree of severity specified in the detail specification. 3.3.2 Unless otherwise specified, each specimen shall be wired according to the manufacturers instructions. 3.3.3 Specimens shal

37、l be tested in a manner such that all mechanical features, such as panel-mounting arrangements, locking and retaining devices, are fully utilized. 3.3.4 The measurements specified in Sub-clause3.4 shall be carried out prior to the test, except those which have been carried out during the final measu

38、rements of the preceding test. 3.4 Testing requirements 3.4.1 Unless otherwise specified in the detail specification, during the test monitoring of the electrical continuity shall be carried out on contacts and screen, where fitted, connected in series.BS5772-4:1979 BSI 09-1999 3 3.4.2 At the conclu

39、sion of the test, the specimen shall be subjected to the following tests unless otherwise specified in the detail specification: 3.4.2.1 Visual examination The specimen shall be visually examined without dismantling. There shall be no loosening, displacement of parts or mechanical damage such as to

40、impair operation. 3.4.2.2 Operational check The mechanical operational characteristics shall be checked according to the detail specification. 3.4.2.3 Contact resistance The contact resistance shall be measured in accordance with the detail specification and shall not exceed the maximum specified va

41、lue. 3.4.2.4 Sealing The specimen shall be subjected to the sealing test specified in the detail specification. Leakage rate across all seals, including panel seals, shall be not greater than specified in the detail specification. 3.5 Details to be specified When this test is required by the detail

42、specification, the following details shall be specified in addition to those specified in Test Ea of IECPublication68-2-27: a) type of cable/wire bundle, its size, length and method of mounting, including the unsupported length of cable from contact to first clamp; b) severity, acceleration; c) seve

43、rity, duration; d) axes and direction of shock; e) pulse shape; f) operational characteristics to be checked; g) contacts to be monitored (or other characteristics appropriate to the particular component), and contact resistance test method(s) to be used; h) any deviation from the standard test meth

44、od and/or conditions. 4 Test 6d: Vibration 4.1 Object The object of this test is to detail a standard test method to assess the ability of components to withstand specified severities of vibration. 4.2 Mounting of specimen The specimen shall be mounted as specified in the detail specification. 4.3 G

45、eneral requirements 4.3.1 This test shall be conducted in accordance with IEC Publication68-2-6, Test Fc: Vibration (sinusoidal), using the degree of severity specified in the detail specification. 4.3.2 Unless otherwise specified, each specimen shall be wired according to the manufacturers instruct

46、ions. 4.3.3 Specimens shall be tested in a manner such that all mechanical features, such as panel-mounting arrangements, locking and retaining devices, are fully utilized. 4.3.4 The measurements specified in Sub-clause4.4 shall be carried out prior to the test, except those which have been carried

47、out during the final measurements of the preceding test. 4.4 Testing requirements 4.4.1 Unless otherwise specified in the detail specification, during the whole of the last frequency sweep in both directions monitoring of the electrical continuity shall be carried out on contacts and screen, where f

48、itted, connected in series. 4.4.2 The specimen shall be vibrated in each of three mutually perpendicular directions, one of which shall be parallel to the axis of the specimen. 4.4.3 At the conclusion of the test the specimen shall be subjected to the following tests unless otherwise specified in th

49、e detail specification: 4.4.3.1 Visual examination The specimen shall be visually examined according to Test 1a of IEC Publication512-2, without dismantling. There shall be no loosening, displacement of parts or mechanical damage such as to impair operation. 4.4.3.2 Operational check The mechanical operational characteristics shall be checked according to the detail specification. 4.4.3.3 Contact resistance The contact resistance shall be measured in accordance with the detail specification and shall not exceed the maximum specified value. 4.4.3.4 Sealing The specimen sh