IEC 60068-2-31-ed.2.0

Detail information

Designation: IEC 60068-2-31-ed.2.0

Publication date: 21/05/2008

Pages: 32

Country: International technical standard

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Anotation

IEC 60068-2-31:2008 deals with a test procedure for simulating the effects of rough handling shocks, primarily in equipment-type specimens, the effects of knocks, jolts and falls which may be received during repair work or rough handling in operational use. This procedure does not simulate the effects of impacts received during transportation as loosely constrained cargo. Where the effects of loose cargo transportation are to be assessed, test Ee: Bounce should be used. Also this procedure does not simulate the effects of shock applied to installed equipments. Where this effect is to be assessed refer to test Ea: Shock. Testing should only be specified for equipment likely to receive such rough handling, for example those of small to medium size and mass, and should only be applied to those faces and corners where there is a risk of such treatment being encountered. In general, equipment which is frequently handled and serviced (for example field equipment and unit spares) can be considered at risk, whereas equipment forming an integral part of a permanent installation would not normally be considered at risk and need not be tested. Testing may not be applicable to fragile unprotected equipment of irregular shape (for example aircraft nose radar) which, when removed from the installation would be contained in a handling frame or jig. It may however be applicable to these items of equipment when they are in their transit case or in their handling frame or jig. For equipment which stands only on one face (for example the normal base) the test is generally only applied to that face. Shock tests are performed on the specimen when fixed to the test machine. Drop and topple, free fall, repeated free fall and bounce tests are performed with the specimen free. This second edition cancels and replaces the first edition, published in 1969 and constitutes a technical revision. The major changes with regard to the previous edition concern the introduction of soft packaging tests, where appropriate. This new edition of IEC 60068-2-31 now incorporates the second edition of IEC 60068-2-32 (1975). La CEI 60068-2-31:2008 consiste en une procedure dessai pour la simulation des effets de chocs lie a des manutentions brutales, principalement pour les specimens tels que des materiels, les effets des coups, des heurts et des chutes qui peuvent etre recus au cours de reparations ou de manutentions brutales durant leur fonctionnement. Cette methode ne simule pas les effets dimpacts recus pendant le transport sans arrimage. Lorsquil est prevu devaluer les effets du transport sans arrimage il convient dutiliser lessai Ee: de rebondissement. Cette methode ne simule donc pas les effets de chocs appliques aux equipements installes. Lorsque il est prevu devaluer cet effet, se referer a lessai Ea de chocs. Il convient que cet essai ne soit normalement specifie que pour les materiels susceptibles detre ainsi manipules, par exemple ceux dont la taille et la masse sont moyennes ou petites, et netre applique quaux faces ou coins qui risquent de subir un tel traitement. En general, on peut considerer quun materiel qui est frequemment manipule et entretenu (par exemple, les materiels de servitude et les unites de rechange) court un tel risque, alors que lon considerera quun materiel qui fait partie integrante dune installation fixe ne court normalement pas ce risque et na pas besoin detre soumis a cet essai. Cet essai peut ne pas etre applicable aux materiels fragiles et non proteges dont la forme est irreguliere (par exemple un radar frontal davion) qui, lorsquils sont retires de linstallation fixe, sont generalement places dans un berceau ou un cadre de manutention. Il peut toutefois etre applicable a ces materiels lorsquils sont dans leur emballage de transport, ou dans leur berceau ou cadre de manutention. Pour les materiels qui ne tiennent dresses que sur une face (par exemple la base normale), on nexecute generalement lessai que sur cette seule face. On execute les essais de chocs en fixant le specimen a la machine dessai. Les essais de chute et culbute, de chute libre, de chutes libres repetees et de rebondissement sont executes sur des specimens non fixes. Cette deuxieme edition annule et remplace la premiere edition, publiee en 1969, et constitue une revision technique. Les modifications principales par rapport a ledition precedente concernent lintroduction, aux endroits appropries, des essais sur les emballages. Par ailleurs, la deuxieme edition de la CEI 60068-2-32 (1975) a ete incorporee dans cette nouvelle edition de la CEI 60068-2-31.