The high and low temperature alternating heat and humidity test chamber is a widely used experimental instrument, which is mostly used for environmental testing of various parts. It is very necessary to know the relevant information before purchasing the instrument. Then, the Shanghai Bao test engineer Zhu Gong will take us to see what needs to be paid attention to during the purchase process of the high and low temperature test chamber.
The high and low temperature alternating heat and humidity test machine is the most common temperature test equipment in the environmental test equipment. The related products are high and low temperature alternating test chamber, constant temperature and humidity test chamber, high and low temperature wet heat alternating test chamber and so on. The above several test equipments are nothing more than temperature control, and the control methods are similar. We should follow the selection of general environmental and reliability test equipment.
The following five basic principles:
1. Reproducibility of Environmental Conditions It is an elusive thing to completely and accurately reproduce the environmental conditions in nature in the laboratory. However, within a certain tolerance range, people can correctly and correctly simulate the external environmental conditions that the engineering products are subjected to during use, storage, transportation, etc. This paragraph is summarized in the language of the project, which is “test equipmentâ€. The environmental conditions (including the platform environment) around the product to be tested should meet the environmental conditions and tolerance requirements specified in the product test specifications.
2. Repeatability of environmental conditions One environmental test equipment may be used for multiple tests of the same type of product, and one engineered product may be tested in different environmental test equipment, in order to ensure the same product The comparability of the test results obtained under the environmental test conditions specified in the same test specification 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.
3. Measureability 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 a certain tolerance, but also to ensure test conditions. Reproducibility and repeatability requirements, and from the safety of product testing is also necessary in order to prevent damage to the test product due to out of control of environmental conditions, resulting in unnecessary losses. The accuracy of the parameter test generally required in various test specifications shall not be less than one third of the allowable error of the test conditions.
4. Exclusion of environmental test conditions Every environmental or reliability test conducted has strict regulations on the types, magnitudes and tolerances of environmental factors, and excludes the environmental factors required for non-tests to penetrate them in order to test When the product failure and failure mode are judged and analyzed after the end of the test, the exact basis is provided. Therefore, the environmental test equipment is not allowed to attach other environmental stress interference to the test product except the specified environmental conditions. For example, the leakage magnetic field of the table, the acceleration signal-to-noise ratio, and the ratio of the total rms value of the in-band and out-of-band acceleration are defined in the electric vibration table verification procedure. The accuracy indicators such as the random signal test and the harmonic distortion degree are all verification items formulated to ensure the environmental test conditions.
5. Safety and reliability of test equipment Environmental test, especially reliability test, long test period, the test object is sometimes a high value military product. During the test, the tester often has to operate or test around the site. Therefore, environmental test equipment is required to have the characteristics of safe operation, convenient operation, reliable use and long working life to ensure the normal operation of the test itself. The various protection, warning 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.
Specific to the purchase of high and low temperature alternating heat and humidity test chamber, how to order high-performance equipment, we can conclude: need to start from the details, understand the manufacturer, understand the product configuration. Whether the compressor of the high and low temperature alternating heat and humidity test chamber is genuine, directly determines the refrigeration field, what brand is used by the controller, directly relates to whether the test process is convenient in the future, what material is used in the outer shell, directly related to cleaning and rust, heating wire, direct design High temperature area. Then there are circuits, waterways and other fields.
The above is the need to pay attention to the high and low temperature alternating heat and humidity test box, I hope to help you choose a satisfactory instrument.
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