As a non-technical person or for the first time setting up an environmental test project, are you still in a hurry to choose what kind of test equipment? Or, as a quality inspection and inspection department, you have been dazzled by various agents on the market when selecting equipment that meets standards such as GB, GJB, IEC, MIL, and DIN?
The selection of environmental and reliability test equipment should follow the following five basic principles:
1. Reproducibility of environmental conditions The complete and accurate reproduction of the environmental conditions present in nature in the test chamber is elusive. However, within a certain range of tolerance, one can exactly and approximately simulate the external environmental conditions that the product undergoes during use, storage and transportation.
2. Repeatability of environmental conditions An environmental test equipment may be used for multiple tests of the same type of product, and a tested 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.
3. 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. The reproducibility and reproducibility requirements and the safety of product testing are also necessary in order to prevent the uncontrolled environmental conditions from causing damage to the tested product and causing 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.
4. Exclusivity of environmental test conditions Each time an environmental or reliability test is conducted, there are strict regulations on the types, magnitudes, and tolerances of environmental factors, and the environmental factors that are not required for the test are infiltrated to facilitate the test. When the failure and failure modes of the product are judged and analyzed after the end of the test, an exact basis is provided. Therefore, the environmental testing equipment is not allowed to add other environmental stress disturbances to the tested product, in addition to providing the specified environmental conditions. For example, the magnetic flux leakage in the table, the signal-to-noise ratio of acceleration, and the ratio of the total rms acceleration in and out of the belt, as defined in the verification procedures for the electric vibration table. Random signal tests, harmonic distortion, and other accuracy indicators are all verification items that are designed to ensure the uniqueness of environmental test conditions.
5. Safety and reliability of test equipment Environmental tests, especially reliability tests, have long test cycles. The objects of the tests are sometimes high-value military products. During the test process, the test personnel often perform patrols or test work around the site. Therefore, it is required that the environmental test equipment must have the characteristics of safe operation, convenient operation, reliable use, and long working life, so as to ensure the normal operation of the test itself. All kinds of protection and alarm measures and safety interlocking devices of the test equipment should be perfect and reliable to ensure the safety and reliability of the test personnel, the tested products and the test equipment itself.
Nanjing Huanke is a manufacturer of equipment that focuses on the environment and has long-term service to mid- to high-end customers.
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