The selection principles of constant temperature and humidity test chamber

Constant temperature and humidity test chamber belong to product of test chamber type, has simple operation, stable performance, convenient maintenance, safe and reliable, etc. Users in the process of constant temperature and humidity test chamber of choose and buy for selection principle is that the need to master, engineering today is to introduce the specific principle of type selection of constant temperature and humidity test chamber, hope you can help to you.

reproducibility

in the test room is complete and accurate reproduction of the nature environment condition that can only dream of. However, within a certain tolerance range, it will be completely correct and approximate simulation engineering products in the process of use, storage, transportation and so on of the external environment condition, it summarize, in the language of engineering is created around the subjects of 'test equipment products surrounding environmental conditions ( Including platform environment) Should meet the conditions stipulated in the test specification product and its tolerance requirements '. As for military products test temperature box is not only to meet military specifications GJB150. 3 - 86年,GJB150。 4 - 86 according to the different types of products under high temperature and low temperature test quantity, test time, at the same time should also meet the test specification for the uniformity of temperature field and temperature control accuracy requirements. Only in this way, to ensure that environmental conditions of reproducibility in the environmental testing.

repeatability

a environmental testing device could be used in many experiments of the same types of products, and a participant engineering products can be tested in different environmental testing equipment, in order to ensure that the same product in the same environment as described in the test specification test under the condition of the comparability of the test results, inevitable requirement environment test equipment provided by the environmental conditions with repeatability. That is to say, environmental testing equipment applied in stress level is test product ( Such as thermal stress, vibration stress, the electric stress, etc. ) To the requirement of the same test specification is the same.

environmental testing equipment provided by the environmental conditions of repeatability is by the national metrological verification department according to the national technical supervision institutions provide guarantee for the verification regulation of verification after qualified. So we must request environmental testing equipment of the technical indicators can meet the verification regulation and the requirement of precision index, and on the use of time does not exceed the time limit stipulated in the verification period. Has been widely used as the electric vibration table in addition to meet the exciting force, the technical indexes such as frequency range, load capacity, also must satisfy the specified in the verification regulation of lateral vibration acceleration ratio, mesa uniformity, harmonic distortion when the requirement of precision index, the use of and after each test cycle for two years, more than two years must be certified before they can be put into use.

measurement and control can be

any environmental testing equipment provided by the environmental conditions must be observed and controlled, it is not only for the environmental parameters are limited within a certain tolerance range, ensure the reproducibility and repeatability of test condition requirements, and starting from the safety of product test is necessary, in order to prevent the subjects product damage caused by environmental conditions is out of control and cause unnecessary losses. Various kinds of test specification generally require the precision of parameter test should not be less than a third of the permissible error test condition.

exclusive

every time, carrying out reliability test of the environment or environmental factors in the category, quantity and tolerance has strict rules, unless the test required environmental factors permeate side by side, so that at the end of the trial or trial judge and analysis of product failure and the failure mode, providing the basis of the exact, so the request environmental testing equipment in addition to providing the conditions stipulated in the outside, don't allow to participants products with the addition of other environmental stress interference. , as defined by the electric vibration table verification regulation of mesa of magnetic flux leakage, the acceleration signal to noise ratio, belt, belt and speed than the total root mean square value. Inspection, harmonic distortion of the random signal precision index is designed to guarantee the uniqueness of environmental test conditions verification program.

security reliability

environmental testing, especially the reliability test, the test cycle is long, the object of the test is sometimes worth of military industrial products is very high, in the process of test, test personnel often have to operate or test work around at the scene, so the environment test equipment must be running safety, convenient operation and reliable in use, long service life, etc, in order to ensure the normal conduct of test itself. Test equipment of all kinds of protection, safety interlock alarm and control should be perfect and reliable, to ensure that the test personnel and test products and be the safety and reliability of the device itself.

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