EN60068 2 27 is intended for equipment or products that could be subjected to infrequent or repetitive shocks during storage, use, or transportation. It is designed to uncover mechanical weaknesses and/or degradation caused by those shocks. Products...
IEC 68 2 27 provides guidance for the test severity and the shape of the shock pulse vs. product application in Annex A. Whenever possible, the test severity and the shape of the shock pulse should reproduce the effects of the actual environment to which the specimen will be subjected, or to satisfy the design requirements if the goal is to assess structural integrity. This test is primarily intended for unpackaged specimens and for items in their transport case when the latter may be considered to be part of the specimen. If an item is to be tested unpackaged, it is referred to as a test specimen.
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IEC 60068-2-47
However, if the item is packaged, then the item itself is referred to as a product and the item and its packaging together are referred to as a test specimen. When used in conjunction with IEC 60068-2-47, this standard may be used for testing packaged products. This possibility was included in the 2005 version of IEC 60068-2-47 for the first time.
This standard is written in terms of prescribed pulse shapes. Guidance for the selection and application of these pulses is given in Annex A and the characteristics of the different pulse shapes are discussed in Annex B. Wherever possible, the test severity and the shape of the shock pulse applied to the specimen should be such as to reproduce the effects of the actual transport or operational environment to which the specimen will be subjected, or to satisfy the design requirements if the object of the test is to assess structural integrity.
For the purposes of this test, the specimen is always mounted to the fixture or the table of the shock test equipment during testing.
IEC 60068 SRS Shock Response Spectrum Testing Standard
IEC 60068-2-81
IEC 60068-2-81 specifies test methods using a synthesized shock response spectrum (SRS). It is intended for components, equipment, and products that may experience complex transient shocks. This test method centers on the use of SRS and techniques associated with SRS. This part of IEC 60068, designed for testing with a synthesized shock response spectrum(SRS) is intended for general application for components, equipment, and other products, hereinafter referred to as"specimens", when simulation of transient responses of a complex nature is required. The test method centers on the use of SRS and techniques associated with SRS.
The purpose of the test is to demonstrate the adequacy of the test specimen to resist the specified transient excitation, without unacceptable degradation of its functional and/or structural performance. It is particularly useful for tailoring shock responses where measured data are available from the operational environment. However, the test is applicable to any transient excitation within the limits of the testing apparatus.
The test method is based primarily on the use of an electrodynamic or servo-hydraulic vibration generator with an associated computer-based control system used as a shock testing system.
Other shock testing machines may be used, provided they fulfill the requirements of this standard.
lt is emphasized that SRS synthesis testing always demands a certain degree of engineering judgment. Both supplier and purchaser should be fully aware of this fact. The writer of the relevant specification is expected to select the testing procedure and the values of severity appropriate to the specimen and its use.
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