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Standards Development
The IEC 60068 series includes a series of methods for environmental testing along with their appropriate severities, and prescribes various atmospheric conditions for measurements and tests designed to evaluate the ability of specimens to perform under expected conditions of transportation, storage and all aspects of operational use.
Although primarily intended for electrotechnical products, this standard is not restricted to them and can be used in other fields where desired.
Other methods of environmental testing, specific to the individual types of specimen , can be included in the relevant specifications.
The framework of environmental test tailoring process is given in order to assist the production of test specifications with appropriate tests and test severities.
The IEC 60068 series provides a series of uniform and reproducible environmental, climatic, dynamic and combined test, performed and measured under standard atmospheric conditions, for those preparing specifications and those engaged in the testing of products.
These test methods are based upon available international engineering experience and judgement and are primarily designed to provide information on the following properties of specimens:
a) the ability to operate within specified limits of temperature, pressure, humidity, mechanical stress or other environmental conditions and combinations of these conditions;
b) the ability to withstand conditions of transportation, storage and installation.
NOTE The IEC 60721 (all parts) [1] provides a system for classification of environmental conditions and gives relevant definitions.
The tests in this standard provide a basis for comparing of the performance of sample products. To evaluate the quality or useful life of a given production lot, the test methods can be applied in accordance with a suitable sampling plan and can be supplemented by appropriate additional tests, if suitable.
To provide tests appropriate to the different intensities of an environmental condition, some of the test procedures have a number of degrees of severity. These different degrees of severity are obtained by varying the time, temperature, air pressure or some other determining factor, separately or in combination.
As the tests and their degrees of severity are to be based on real environmental conditions that a particular specimen can encounter, the framework and the phases for the environmental test tailoring process are provided. The test tailoring process can be used to produce the relevant test specification for the particular specimen.
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