Environmental test chambers are within a certain tolerance range. People can exactly and approximately simulate the external environmental conditions that engineering products undergo during use, storage and transportation. This paragraph is summarized in the language of the project, which is "the environmental conditions surrounding the tested product (including the platform environment) created by the test equipment should meet the requirements of the environmental conditions and tolerances specified in the product test specifications."
Reproducibility of environmental conditions: An environmental test equipment may be used for multiple tests of the same type of product, and a tested engineering product may also be tested in different environmental test equipment, in order to ensure that the same product is in the same The comparability of the test results obtained under the environmental test conditions specified in the test specifications necessarily requires the repeatability of the environmental conditions provided by the environmental test equipment. This means that the stress levels (eg, thermal stress, vibrational stress, electrical stress, etc.) imposed on the tested product by the environmental testing equipment are consistent with the requirements of the same test specification.
The repeatability of the environmental conditions provided by the environmental test equipment is provided by the national metrological verification department after it is qualified according to the verification procedures established by the national technical supervision institution. For this purpose, the environmental testing equipment must be required to meet the requirements of the technical indicators and accuracy indicators in the verification procedures, and the time limit specified in the verification period shall not be exceeded in the use time. If the use of very common electric vibration table to meet the technical parameters such as excitation force, frequency range, load capacity, etc., must also meet the requirements of the accuracy specifications such as lateral vibration ratio, table acceleration uniformity, harmonic distortion degree specified in the verification procedures. , And the use period after each verification is two years, more than two years must be re-certified before they can be put into use.
The controllability of environmental condition parameters: The environmental conditions provided by any environmental test equipment must be observable and controllable. This is not only to limit the environmental parameters within a certain tolerance range, but also to guarantee the test conditions. Reproducibility and reproducibility requirements, but also from the safety of product testing is also necessary in order to prevent the loss of control of the environmental conditions caused by the damage of the test product, resulting in unnecessary losses. At present, the accuracy of the parameters required by various test specifications is not to be less than one third of the allowable error of the test conditions.
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