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1、J IS JAPANESE I NDUSTRIAL STANDARD Translated and Published by Japanese Standards Association Basic environmental testing procedures Part 2 I Tests- Test Ga and guidance: Acceleration, steadv state - The code number of this Standard changed from JIS C 0045 to the following from 20 March 2004. JIS C
2、60068-2-7:1993 ICs 19.080; 19.040 Descriptors : electrical and electronic testing; environmental testing Reference number : JIS C 0045 : 1993 (E) PROTECTED BY COPYRIGHT s Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bern
3、ie Not for Resale, 03/12/2007 08:13:20 MDTNo reproduction or networking permitted without license from IHS -,-,- C 0045 : 1993 (IEC 68-2-7 1983) Foreword This translation has been made based on the original Japanese Industrial Standard established by the Minister of International Trade and Industry
4、through deliberations at Japanese Industrial Standards Committee in accordance with the Industrial Standardization Law: Date of Establishment: 1993-10-01 Date of Public Notice in Official Gazette: 1993-10-13 Investigated by: Japanese Industrial Standards Committee Divisional Council on Electronics J
5、IS C 0045 : 1993, First English edition published in 2000-01 Translated and published by: Japanese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN In the event of any doubts arising as to the contents, the original JIS is to be the final authority. O JSA2000 All rights reserv
6、ed. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. Printed in Japan PROTECTED BY COPYRIGHT Copyright Japanese Standard
7、s Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 08:13:20 MDTNo reproduction or networking permitted without license from IHS -,-,- JAPANESE INDUSTRIAL STANDARD JIS C 60068-2-7:1993 (IEC 68-2-7 : 1983) Basic environme
8、ntal testing procedures Part 2: Tests - Test Ga and guidance: Acceleration, steady state Foreword for Japanese Industrial Standard This Japanese Industrial Standard has been prepared based on the 2nd edition issued in 1983 of IEC 68-2-7 (Basic environmental testing procedures, Part 2: Tests, Test Ga
9、 and guidance: Acceleration, steady state) and 1986 Amendment No. 1 without changing the technical contents. Furthermore, the “Informative references“ that are indicated by underline (dotted line) do not appear in the original International Standard. 1. Scope To prove the structural suitability and
10、the satisfactory performance of components, equipment and other electrotechnical products, hereinafter referred to as “specimens“, when subjected to forces produced by steady acceleration environments (other than gravity) such as occur in moving vehicles, especially flying vehicles, rotating parts a
11、nd projectiles, and to provide a test of structural integrity for certain components. 2. General of test Equipment, components and other electrotechnica1 products intended to be installed in moving bodies will be subjected to forces caused by steady accelerations. Naturally, such an environment is m
12、ost pronounced in flying vehicles and rotating machinery, although in certain conditions accelerations in land vehicles may be of significant magnitude. In general, the acdelerations encountered in service have different values along each of the major axes of the moving body, and, in addition, usual
13、ly have different values in the opposite senses of each axis. If the attitude of the specimen is not fixed with regard to the moving body, then the relevant specification should prescribe a level, which may be applied along each of the major axes and senses of the specimen, having taken into account
14、 the maximum accelerations in different axes of the moving body. This standard is to be used in conjunction with JIS C 0010: 1993 Environmental testing Part 1: General and guidance. PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Emp
15、loyees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 08:13:20 MDTNo reproduction or networking permitted without license from IHS -,-,- 2 C 0045 : 1993 (IEC 68-2-7 : 1983) 3. Conditions for testing 3.1 3.1.1 3.1.2 Characterisrics o f rhe test apparatus General Acceleration conditions are
16、applied by means of a centrifuge where the acceleration is directed towards the centre of the rotating system. In certain special cases, however, the specimen may be sensitive to gyroscopic couples, and it may only be possible to perform the test by using a machine capable of applying linear acceler
17、ation, in which case the relevant specification shall state this requirement. Tangential acceleration When increasing the rotational speed of a centrifuge from zero to the value necessary to achieve the specified acceleration, or when decreasing back to zero, the machine shall be so controlled that
18、the specimen is not subjected to a value of tangential acceleration greater than 10% of the specified acceleration. 3 . 1 . 3 Acceleration gradient The dimensions of a centrifuge relatiue to the specimen shall be such that no part of the specimen, other than flying leads, shall be subjected to a val
19、ue of acceleration outside the tolerances given in Sub-clause 3.1.4. 3 . 1 . 4 Acceleration tolerance If the linear dimensions of the specimen are less than 10 cm, the acceleration on all parts of the specimen (excluding flying leads) shall not depart from the specified steady-state acceleration by
20、more than * 10%. In other cases, the tolerance on the. specified steady-state acceleration is - 10% +30%. 3.2 Mounting The specimen shall be mounted on the test apparatus in accordance with the requirements in JIS C 0040-1987, Appendix D: Basic Environmental Testing Procedures, Mounting of Component
21、s, Equipment and Other Articles for Dynamic Tests and Guidance. Nore. - For reasons of safety, care should be taken to prevent the specimens under test from being thrown off if the mounting attachments are broken but any safety devices used should not introduce additional constraint during the test.
22、 PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 08:13:20 MDTNo reproduction or networking permitted without license from IHS -,-,- Y C 0045 : 1993 (IEC 68-2-7 : 1983
23、) 4. Severity The relevant specification shall prescribe an acceleration value for the test, chosen, where possible, from the standard values listed below. It shall also prescribe the angle, with respect to the axes of the specimen, at which this acceleration is to be applied, where it is necessary
24、(Clauses Al, A2 and B2). The standard levels of test are: 1 Acceleration 30 50 100 200 500 lo00 ZOO0 5000 10 o00 20 O00 50 O00 100 o00 200 o00 300 M30 500 O00 Note. - The value prescribed for the acceleration should take into account the purpose of the test, whether it is to be made for checking the
25、 structural integrity of the specimen or to assess the ability of the specimen to withstand the forces occumng in moving vehicles or rotating machinery. 5. Initial measurements The specimen shall be submitted to the visuaI, dimensional and functional checks prescribed by the relevant specification.
26、6. Conditioning: procedure for testing with a centrifuge 6.1 Unless otherwise stated in the relevant specification, the acceleration conditioning shall be imposed in both senses of three mutually perpendicular axes in turn, which shall be the three major axes. 6.2 The centrifuge shall be rotated at
27、the speed necessary to produce the specified level. 6.3 The necessary speed of rotation shall be maintained for not less than 10 s or for a period stated in the relevant specification. 6.4 The relevant specification shall prescribe which of the following conditions of functioning or survival has to
28、be satisfied and the corresponding acceleration level(s) (Clause A2): PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 08:13:20 MDTNo reproduction or networking permit
29、ted without license from IHS -,-,- 4 C 0045 : 1993 (IEC 68-2-7 : 1983) I) Specimen to function within the performance limits given in the relevant specification. 2) Specimen to function, but not necessarily within the performance limits, but should suffer no permanent derangement. 3) Specimen not to
30、 suffer any permanent derangement, but need not function. 4) Specimen not to break loose, although it may be permanently damaged or deranged. 6.5 The relevant specification shall prescribe the order in which the checks in Sub-clause 6.4 are to be applied (Clause A2). 7. Final measurements The specim
31、en shall be submitted to the visual, dimensional and functional checks as prescribed by the relevant specification. 8. Information to be given in the relevant specification When this test is included in a relevant specification, the following details shall be given as far as they are applicable: u)
32、Type of test apparatus b) and c) Methods of mounting the specimen d) Acceleration level(s) (Clauses A2 and B2) e) Axes and direction of acceleration (Clause Al) 3 Initial measurements Clause 5 g ) Duration of conditioning Sub-clause 6.3 h) Conditions of functioning or survival (Clause 31) Sub-clause
33、 6.4 j ) Order of checks Sub-ciause 6.5 k) Final measurements Clause 7 Sub-clause 3.1 Sub-clause 3.2 Clause 4 Clauses 4, 6 PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/
34、2007 08:13:20 MDTNo reproduction or networking permitted without license from IHS -,-,- 5 C 0045 : 1993 (IEC 68-2-7 : 1983) APPENDIX A GUIDANCE Al. Specimen orientation for test In many applications, especially aircraft, the forces on the moving body giving rise to acceleration are invariably comple
35、x but can be considered, at any instant, to be a single force which can be described in direction by its angular position relative to the three main axes of the moving body. For design purposes, the maximum acceleration levels for a particular maneuvre of the moving body are resolved and specified w
36、ith respect to each major axis of the moving body. If a specimen has a known fixed attitude with respect to a given moving body, and in cases where it is necessary to simulate the three components of acceleration simul- taneously, these can be combined and the specimen subjected to a single accelera
37、tion equal in magnitude and direction to the resultant of the three component levels. Such action would necessitate rather complicated jigs, in order to orientate a specimen relative to the test machine in such a manner that the acceleration is directed along the line of the resultant. Unless it is
38、important to preserve the angular relationship between the resultant acceleration and the specimen, it is simpler and usually adequate to apply the resultant acceleration along the major axis of the specimen having the highest of the three specified component levels; in the remaining axes the approp
39、riate component acceleration levels would be applied. When the attitude of the specimen with respect to the vehicle is not known, the maximum resultant level for the particular moving body should be applied in each direction in turn along each of the three major axes of the specimen. A2. Acceleratio
40、n levels Some of the acceleration values listed in Clause 4 represent actual environments and others, especially at the higher levels, represent artificial environments used for the structural integrity testing of some electronic components. Bearing in mind the high acceleration figures which may oc
41、cur in rotating machinery, the actual levels for some purposes may overlap with the artificial levels for other purposes. Design approval for aircraft equipment requires that equipment be tested in turn for operation and survival at different levels of acceleration. The operational and survival requ
42、irements are related by a defined factor, which is stated in the design requirements for aircraft equipment. There are normally four conditions to be satisfied: i) Proof or operational level - normally, the specimen would be required to function at this level, without degradation in performance outs
43、ide specification limits. 2) An additional higher level may be prescribed which allows the specimen to function although not necessarily within the stated limits. 3) Structural or ultimate levels - a higher level of acceleration to check resistance to structurai deformation. PROTECTED BY COPYRIGHT C
44、opyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 08:13:20 MDTNo reproduction or networking permitted without license from IHS -,-,- 6 C 0045 : 1993 (IEC 68-2-7 : 1983) 4) In addition, an acce
45、leration conditioning may be required as a means of checking the ability of a specimen to remain firmly attached to its mounting and not to break loose during emergency conditions in a manner liable to create a hazard to personnel, either directly or by interference with emergency exits, etc. The re
46、levant specification should state which of these conditions is to be met, the acceleration levels to be applied, and the conditions of operation to be satisfied (see Sub-clauses 6.4 and 6.5). In some applications, the writer of the relevant specification may not always prescribe separate levels corr
47、esponding to Items 1) to 4 ) above and may instead state one level only, which is related by an agreed safety factor to the maximum measured or calculated acceleration for the moving body concerned. When such a test is invoked, the relevant specification states the type of performance required (see
48、Sub-clauses 6.4 and 6.5). When choosing the seventy of accelerations to be applied, the relevant specification should take into account the fact that, in a given direction, the maximum acceleration may differ considerably from place to place in the moving body. Certain components, notably from the s
49、emiconductor industry, are checked for structural integrity sound mechanical assembly) by the application of a very high acceleration. Although such a level has no correlation with actual service conditions, the tests are used as a simple means of applying a high stress to reveal possible construction