BS EN 60068-2-80:2005

INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements for testing
   4.1 General
   4.2 Control systems
   4.3 Basic motion
   4.4 Cross axis motion
   4.5 Mounting
   4.6 Measuring systems
5 Requirements for testing mixed mode
   5.1 Vibration tolerances - Random
   5.2 Vibration tolerances - Sine
   5.3 Control strategy
   5.4 Vibration response investigation
6 Severities
   6.1 Broadband random vibration
   6.2 Random narrowbands
   6.3 Sine tones
7 Preconditioning
8 Initial measurements
9 Testing
   9.1 General
   9.2 Initial vibration response investigation
   9.3 Low-level excitation for equalization prior to
        testing
   9.4 Mixed mode testing
   9.5 Final vibration response investigation
10 Intermediate measurements
11 Recovery
12 Final measurements
13 Information to be given in the relevant specification
14 Information to be given in the test report
Annex A (informative) Mixed mode general information
Annex B (informative) Guidance
Bibliography
Annex ZA (normative) Normative references to international
                     publications with their
                     corresponding European publications

Recommends for general application for testing specimens when simulation is required of vibration excitation of a complex and mixed nature.

This part of IEC 60068 is intended for general application for testing specimens when simulation is required of vibration excitation of a complex and mixed nature.

The purpose of the test is to demonstrate the adequacy of the specimen to resist the specified mixed mode excitation without unacceptable degradation of its functional and/or structural performance. It is particularly useful for tailoring mixed mode environments where measured data are available for the real life environment.

The test also helps reveal the accumulated effects of stress induced by random vibration, mixed with sine and/or random, and the resulting mechanical weakness and degradation in specified performances, and to use this information, in conjunction with the relevant specification, to assess the acceptability of specimens. In some cases, this standard may also be used to demonstrate the mechanical robustness of specimens.

This standard is applicable to specimens which may be subjected to vibration of a random and/or a combination of random and deterministic nature resulting from transportation or real life environments, for example in aircraft, space vehicles and for items in their transportation container when the latter may be considered as part of the specimen itself.

Although primarily intended for electrotechnical specimens, this standard is not restricted to such specimens and may be used in other fields where desired.