BS 5772-5-1993 Specification for electromechanical components for electronic equipment basic testing procedures and measuring methods - Impact tests (free components) static load t.pdf

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1、BRITISH STANDARD BS5772-5: 1993 IEC512-5: 1992 Specification for Electromechanical components for electronic equipment: testing procedures and measuring methods Part 5: Impact tests (free components), static load tests (fixed components), endurance tests and overload testsBS5772-5:1993 This British

2、Standard, having been prepared under the directionof the Electronic Components Standards PolicyCommittee, was publishedunder the authorityofthe Standards Boardand comes into effect on 15July1993 BSI 08-1999 First published November 1979 The following BSI references relate to the work on this standar

3、d: Committee reference ECL/21 Special announcement in BSINews January 1993 ISBN 0 580 21859 7 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Electronic Components Standards Policy Committee (ECL/-) to Technical Committee ECL/21, upon wh

4、ich the following bodies were represented: EEA (the Association of the Electronics, Telecommunications and Business Equipment Industries) Electronic Components Industry Federation Ministry of Defence National Supervising Inspectorate Amendments issued since publication Amd. No. Date CommentsBS5772-5

5、:1993 BSI 08-1999 i Contents Page Committees responsible Inside front cover National foreword ii Section 0. General 0.1 Scope 1 0.2 Normative references 1 Section 1. Impact tests (free components) 1 Test 7a: Free fall (repeated) 1 2 Test 7b: Mechanical strength impact 1 Section 2. Static load tests

6、(fixed components) 3 Test 8a: Static load, transverse 3 4 Test 8b: Static load, axial 4 5 Test 8c: Robustness of actuating lever 4 Section 3. Endurance tests 6 Test 9a: Mechanical operation 5 7 Test 9b: Electrical load and temperature 6 8 Test 9c: Mechanical operation with electrical load 7 9 Test 9

7、d: Durability of contact retention system and seals (maintenance,ageing) 8 10 Test 9e: Current loading, cyclic 8 Section 4. Overload tests 11 Test 10a: Electrical overload (switches) 9 12 Test 10b: Mechanical overload (switches) 9 13 Test 10c: Switching capacitive loads 9 14 Test 10d: Electrical ove

8、rload (connectors) 10 Figure 1 Tumbling barrel 2 Figure 2 3 Figure 3 Details of force application 5 Figure 4 10 List of references Inside back coverBS5772-5:1993 ii BSI 08-1999 National foreword This Part of BS5772 has been prepared under the direction of the Electronic Components Standards Policy C

9、ommittee. It is identical with IEC Publication512-5:1992, Electromechanical components for electronic equipment; basic testing procedures and measuring methods Part5: Impact tests (freecomponents), static load tests (fixed components), endurance tests and overload tests published by the Internationa

10、l Electrotechnical Commission (IEC). which are withdrawn. It should be read in conjunction with Part1 General of BS5772:1985 (IEC512-1:1984) which contains information on fundamental test methods and procedures to be employed in implementing the requirements of this standard. The Technical Committee

11、 has reviewed the provisions of IEC65:1985 and IEC130-1:1988 to which reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. A related British Standard to IEC65:1985 is BS415:1990 Specification for safety requirements for mains-operated ele

12、ctronic and related apparatus for household and similar general use. 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 immun

13、ity from legal obligations. It supersedes: BS5772-5:1979 BS5772-5:Supplement1:1981 BS5772-5:Supplement2:1982 Cross-references International standard Corresponding British Standard IEC68-2-13:1983 BS2011 Environmental testing Part 2.1M:1984 Test M. Low air pressure (Identical) IEC512-1:1984 BS5772 Ba

14、sic testing procedures and measuring methods for electromechanical components for electronic equipment Part1:1985 General (Identical) Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to12, an inside back cover and a back cover. This standard has bee

15、n updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS5772-5:1993 BSI 08-1999 1 Section 0. General 0.1 Scope The tests contained herein, when required by the detail specification, shall be used for electrome

16、chanical components within the scope of technical committee no.48 1) . They may also be used for similar devices when specified in a detail specification. 0.2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of thi

17、s part of IEC512. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC512 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indic

18、ated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC65:1985, Safety requirements for mains operated electronic and related apparatus for household and similar general use. IEC68-2-13:1983, Environmental testing Part2:Tests. Test M: Low air pressure. I

19、EC130-1:1988, Connectors for frequencies below3MHz Part1: General requirements and measuring methods. IEC512-1:1984, Electromechanical components for electronic equipment; basic testing procedures and measuring methods Part1: General. Section 1. Impact tests (freecomponents) 1 Test 7a: Free fall (re

20、peated) 1.1 Object The object of this test is to define a standard test method to assess the ability of a component to withstand the impacts it would receive when dropped repeatedly. 1.2 Preparation of the specimen Unless otherwise specified, the specimen shall not be mounted or wired, but shall be

21、fitted with normal accessories according to the detail specification. 1.3 Test method The specimen shall be tested in a tumbling barrel as shown in Figure 1. The barrel turns at a rate of approximately 5rev/min. The total number of revolutions (falls) shall be according to the detail specification.

22、NOTEWhen IEC65 applies, the barrel revolves50times if the mass of the specimen is up to250g and25times if the mass is greater than250g. 1.4 Final examination The specimen shall be visually examined according to test1a. If required by the detail specification, the operation shall be checked. 1.5 Requ

23、irements There shall be no broken parts or damage that would impair normal operation. 1.6 Details to be specified When this test is required by the detail specification, the following details shall be given: a) preparation of the specimen; b) accessories to be installed, when appropiate; c) total nu

24、mber of revolutions (falls); d) operational requirements; e) any deviation from the standard test method. 2 Test 7b: Mechanical strength impact 2.1 Object The object of this test is to detail a standard test method to assess the ability of an electromechanical component on the end of a cable or wire

25、 bundle to withstand impacts it could receive when dropped on to a hard surface. 2.2 Preparation of the specimen The specimen shall consist of a free connector or a similar component with its accessories fitted in the normal manner and wired as used in the normal application. The specimen shall be p

26、repared in accordance with the detail specification. 1) Scope of technical committee48: To prepare international standards regarding components having an inherent electromechanical connecting, or switching function, intended for use in equipment for telecommunication and in electronic devices employ

27、ing similar techniques. NOTE 1R.F. connectors will not be dealt with by this technical committee as they will be covered by technical committee46 together with r.f. cables. NOTE 2Sockets for components such as crystals or electronic tubes shall be considered in co-operation with the relevant technic

28、al committee.BS5772-5:1993 2 BSI 08-1999 If the component is normally provided for use with different types of cables, the thinnest and/or most flexible type shall be used. The length of the cable or wire bundle shall allow the rear of the specimen to be2250 10mm(88,6 0,4in) from the point of attach

29、ment. 2.3 Test method The specimen shall be attached in an appropriate manner at a distance of 2250 10 mm (88,6 0,4 in) from the rear of the component so that the specimen may swing freely from a horizontal to a vertical position as shown in Figure 2. NOTEAn appropriate manner may be the attachment

30、to a swivel. In many cases, however, simply attaching to a hook may be sufficient. The specimen shall be attached at one of the following preferred heights: A steel plate300mm 500mm(11,8in 19,7in) of25mm thickness shall be positioned so that the component under test will fall on to it. The specimen,

31、 attached at the specified height, shall be held in a horizontal position in an attitude as specified and dropped on to the steel plate. This cycle shall be repeated for a total number of times as specified in the detail specification. 2.4 Test requirements The component shall be visually examined.

32、There shall be no broken parts nor damage that would impair operation. Figure 1 Tumbling barrel 2000 10mm(78,7 0,4in) 1750 10mm(68,9 0,4in) 1500 10mm(59,1 0,4in) 1250 10mm(49,2 0,4in) 1000 10mm(39,4 0,4in) 750 10mm(29,5 0,4in) 500 10mm(19,7 0,4in)BS5772-5:1993 BSI 08-1999 3 2.5 Details to be specifi

33、ed When this test is required by the detail specification, the following details shall be specified: a) preparation of the specimen; b) type of accessory, when required; c) cable or wire to be used; d) height or heights from which the component is to be dropped; e) number of dropping cycles at each

34、height; f) operational tests; g) any deviation from standard test method; h) attitude of the specimen. Section 2. Static load tests (fixedcomponents) 3 Test 8a: Static load, transverse 3.1 Object The object of this test is to detail a standard test method to assess the suitability of a fixed compone

35、nt for use in applications where it may be subject to transverse stresses. 3.2 Preparation of the specimen The specimen shall not be wired but shall be fitted with such accessories as may be required by the detail specification. Unless otherwise specified, the specimen shall be mounted in the normal

36、 manner, using the normal panel or chassis cut-out as laid down in the detail specification. NOTEThe plate should be strong enough to sustain the applied forces. The length and width of the plate should be such that the contour of the specimen is exceeded. 3.3 Test method A specified force shall be

37、applied to the specimen at the point and in the direction(s) as specified in the detail specification. This force shall be steadily increased up to the specified value and maintained for1min. The force shall be parallel to the mounting plate. 3.4 Final measurements a) Visual examination (test1a). b)

38、 Applicable operational characteristics. c) Sealing (test14), if applicable. 3.5 Requirements There shall be no damage which would impair normal operation. Figure 2 BS5772-5:1993 4 BSI 08-1999 3.6 Details to be specified When this test is required by the detail specification, the following details s

39、hall be given: a) mounting of the specimen, including dimensions of the panel cut-out; b) type of accessories, if required; c) value of force; d) location, direction(s), rate and duration of application of the force; e) shape of the fixture or tool used for applying the force; f) requirements for fi

40、nal measurements; g) any variation from the standard test method. 4 Test 8b: Static load, axial 4.1 Object The object of this test is to detail a standard test method to determine the ability of a component to withstand a steady axial force which might occur during normal use. 4.2 Preparation of the

41、 specimen The specimen shall be rigidly mounted on a metal plate using its normal fixing device. The dimensions (length and width) of the mounting plate shall be such that the contour of the specimen is exceeded. 4.3 Test method A specified force shall be applied to the specimen at the point and in

42、the direction(s) as specified in the detail specification. This force shall be steadily increased up to the specified value and maintained for a specified period. The force shall be perpendicular to the mounting plate. 4.4 Final measurements a) Visual examination (test1a). b) Applicable operational

43、characteristics. c) Sealing (test14), if applicable. 4.5 Requirements There shall be no damage which would impair normal operation. 4.6 Details to be specified When this test is required by the detail specification, the following details shall be given: a) mounting of the specimen, including dimensi

44、ons of the panel cut-out; b) type of accessories, if required; c) shape of the fixture or tool used for applying the force, if necessary; d) force to be applied, point of the application, direction(s), rate of increase of the force and duration of application; e) final measurements to be applied; f)

45、 any deviation from the standard test method. 5 Test 8c: Robustness of actuating lever 5.1 Object The object of this test is to detail a standard test method to assess the robustness of the actuating lever of a toggle switch or a connector release mechanism. 5.2 Preparation of the specimen The speci

46、men shall be rigidly mounted on a metal plate using its normal fixing device. The dimensions (length and width) of the mounting plate shall be such that the contour of the specimen is exceeded. 5.3 Test method 5.3.1 Force A specified force shall be applied for1min at the tip of the actuating lever.

47、This force shall be applied in each of the following directions (see Figure 3): perpendicular to the lever axis and in the plane of lever travel and at each end position of the lever (F a1and F a2 ); perpendicular to the lever axis and perpendicular to the plane of lever travel at each position of t

48、he lever (F b1and F b2 ); axially with the lever axis towards the lever pivot (F c ); axially with the lever axis away from the lever pivot (F d ). The force shall be steadily increased at a rate of approximately20N/s up to the specified value and maintained for1min. 5.3.2 Torque A specified torque

49、shall be applied around the axis of the lever in either direction for1min. 5.4 Final measurements a) Visual examination (test1a). b) Operational characteristics. c) Sealing (test14), if applicable. 5.5 Requirements There shall be no damage which would impair normal operation.BS5772-5:1993 BSI 08-1999 5 5.6 Details to be specified When this test is required by the detail specification, the following details shall be given: a) mounting details, including dimensions of the panel cut-out; b) shape of the fixture or tool used for applyin