IEC 60068-2-64 Vibration Testing

The IEC 60068-2-64 package testing standard addresses structural integrity. The scope of this transit testing standard demonstrates the adequacy of equipment to resist dynamic loads under random vibration. Units that meet the test requirement have no or acceptable degradation of function or structural integrity.

Broadband random vibration may be used to identify a number of issues. These issues include accumulated stress effects and the resulting mechanical weakness. Another issue could be the degradation in the unit’s specified performance. IEC 60068-2-64 transit testing is applicable to specimens which may be subjected to vibration of a stochastic nature. This vibration can result from transportation or operational environments. For example, in aircraft, space vehicles and land vehicles.

The methods and techniques in this standard are based on digital control of random vibration. It permits the introduction of variations to suit individual cases if these are prescribed by the relevant specification. Compared with most other tests, this test is not based on deterministic but on statistical techniques. Broad-band random vibration testing is therefore described in terms of probability and statistical averages.

It is emphasized that random testing always demands a certain degree of engineering judgement, and 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. The test method is based primarily on the use of an electrodynamic or a servo-hydraulic vibration generator with an associated computer-based control system used as a vibration testing system.

This compliance test standard is primarily intended for unpackaged specimens. It is also intended for items in their transportation container when the latter may be considered as part of the specimen itself. However, if the item is packaged, then the item itself is referred to as a product. In this case, the item and its packaging together are referred to as a test specimen.

Some specimens can be subjected to vibration of a combination of random and other forces. These can result from transportation or real-life environments. Examples include aircraft, space vehicles and items in their transportation container. In these cases, testing with pure random may not be sufficient.

IEC 60068-2-64 compliance testing follows a specific test sequence. This sequence is as follows:

  • initial vibration response investigation, if prescribed;
  • low-level excitation for equalization before proceeding to the full level test in one continuous mode;
  • random vibration testing;
  • final vibration response investigation, if prescribed.

The test item is to be excited in each of the preferred testing axes. The order of the testing along these axes is not important, unless prescribed by the relevant specification. If the specimen is sensitive to gravity, for example a mercury tilt switch, then vibration may only be applied in its normal service position and shall be prescribed by the relevant specification.

Keystone Package Testing has significant IEC 60068-2-64 random vibration testing experience. With four shakers and lab full of support equipment, our schedule lead times are short. Our engineers provide guidance when problems arise, always assisting customers with finding potential solutions. We communicate throughout the test program and also assist in engineering test plans.

We have a team of report writers dedicated to accurate and timely reports. Our lab is also ISO-17025 accredited. Contact us to see why so many companies partner with Keystone Package Testing to meet their IEC 60068-2-64 testing needs.

 

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