What is the meaning of the controllability and repeatability of environmental condition parameters?

What is the meaning of the controllability and repeatability of environmental condition parameters?
What is the measurability of environmental condition parameters?
The environmental conditions provided by any environmental test equipment must be observable and controllable, not only to limit environmental parameters to within certain tolerances, but also to ensure reproducibility and repeatability of test conditions. Moreover, it is necessary to start from the safety of the product test, in order to prevent the damage of the test product caused by the out of control of the environmental conditions, resulting in unnecessary loss. At present, the accuracy of the parameter test generally required in various test specifications should not be less than one third of the error allowed by the test conditions.
What is the repeatability of environmental conditions?

An environmental test equipment may be used for multiple tests of the same type of product, and one engineered product may also be tested in different environmental test equipment in order to ensure that the same product is in the same test test. The comparability of the test results obtained under the conditions necessarily requires the environmental conditions provided by the environmental test equipment to be reproducible. That is to say, the stress level (such as thermal stress, vibration stress, electrical stress, etc.) applied to the product under test by the environmental test equipment is consistent with the requirements of the same test specification. The repeatability of the environmental conditions provided by the environmental test equipment is guaranteed by the national metrological verification department after passing the verification according to the verification procedures formulated by the national technical supervision agency. To this end, environmental testing equipment must be required to meet the requirements of various technical indicators and accuracy indicators in the verification procedures, and the time limit specified in the verification period should not exceed the time limit. If the use of the very common electric vibration table meets the technical indicators such as excitation force, frequency range, load capacity, etc., it must also meet the requirements of the accuracy index such as lateral vibration ratio, mesa acceleration uniformity and harmonic distortion specified in the verification regulations. And the use period after each verification is two years, more than two years must be re-qualified before they can be put into use.


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