The principle of repeatability of constant temperature and humidity chamber
The constant temperature and humidity chamber is favored by the industry electronics, military, plastics, hardware, chemical and other industries. It can simulate the temperature and humidity climate test of parts and materials in their industry, and can effectively simulate high temperature and high humidity, high temperature and low humidity, low temperature. Test climatic conditions in different environments such as high humidity, low temperature, low humidity, high temperature and low temperature.
The constant temperature and humidity chamber has five principles of repeatability, reproducibility, controllability, exclusivity and safety and reliability in simulating the climate. Xiaobian mainly talks about the first and very important selection principle:
The repeatability of the environmental conditions provided by the environmental test equipment industry is guaranteed by the national metrological verification department after passing the verification according to the verification procedures formulated by the national technical supervision agency. Therefore, the environmental test equipment must be required to meet the requirements of various technical indicators and accuracy indicators in the verification procedures, and the use time is not to exceed the time limit specified in the verification period. If the widely used electric vibration table needs to meet the technical indexes such as excitation force, frequency range and load capacity, it must also satisfy the accuracy of lateral vibration ratio, mesa acceleration uniformity and harmonic distortion specified in the verification regulations. The requirements of the index, and the use period after each verification should be two years. After more than two years, it must be re-verified until it is qualified before it can be put into use.
A constant temperature and humidity chamber environmental test equipment may be used for multiple tests of the same type of product. However, one 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 specification must require that the environmental conditions provided by the environmental test equipment be reproducible. That is to say, the stress level (such as thermal stress, vibration stress, electrical stress, etc.) applied by the environmental test equipment to the tested product is consistent with the requirements of the same test specification.
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