High and low temperature test chambers can be divided into "alternating test" and "constant temperature test" according to test methods and industry standards. Both test methods are upgraded and expanded on the basis of high and low temperature test chambers. The high temperature, low temperature and time to be set are set in the instrument parameters. The test box will follow the set procedure. The high and low temperature test box is to make a fixed temperature to make the test effect closer to the natural climate and simulate worse The natural climate, which makes the tested samples more reliable.
The high and low temperature test chamber is the most common temperature test equipment in the environmental test equipment. The similar related products include high and low temperature alternating test chamber, constant temperature and humidity test chamber, high and low temperature humidity and heat alternating test chamber, etc. The above test equipments have nothing more than temperature control, and the control methods are similar. Shanghai Jianhu Instrument Equipment Co., Ltd. listed the following five basic principles according to the selection of general environment and reliability test equipment:
1. Reproducibility of environmental conditions
It is beyond expectation to completely and accurately reproduce the environmental conditions existing in nature in the laboratory. However, within a certain tolerance range, people can completely and accurately simulate the external environmental conditions experienced by engineering products during use, storage, transportation, etc. This paragraph is summarized in the language of engineering, that is, "test equipment The environmental conditions (including platform environment) created around the tested product should meet the environmental conditions and tolerance requirements specified in the product test specifications
2. Repeatability of environmental conditions
An environmental test equipment may be used for multiple tests of the same type of product, and a tested engineering product may also be tested in different environmental test equipment. The comparability of the test results obtained under the conditions inevitably requires the repeatability of the environmental conditions provided by the environmental test equipment. 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.
3. Measurability of environmental condition parameters
The environmental conditions provided by any environmental test equipment must be observable and controllable, not only to limit the environmental parameters to a certain tolerance range, but also to ensure the reproducibility and repeatability of the test conditions, and It is also necessary to proceed from the safety of product testing in order to prevent damage to the tested product due to uncontrolled environmental conditions and bring unnecessary losses. Various test specifications generally require that the accuracy of the parameter test should not be less than one-third of the allowable error of the test conditions.
4. Exclusiveness of environmental test conditions
Each environmental or reliability test conducted has strict regulations on the types, values ​​and tolerances of environmental factors, and excludes non-testing environmental factors from penetrating into it, so as to judge and analyze the product during or after the test When failure and failure modes are provided, the exact basis is provided. Therefore, in addition to providing the specified environmental conditions, the environmental test equipment is not allowed to add other environmental stress interference to the tested product. The magnetic flux leakage of the table, the acceleration signal-to-noise ratio, and the ratio of the total rms value of the acceleration in and out of the band as defined in the electric vibration table verification regulations. Accuracy indicators such as random signal inspection and harmonic distortion are all verification items formulated to ensure the uniqueness of environmental test conditions.
5. Safety and reliability of test equipment
Environmental testing, especially reliability testing, has a long test period. The test object is sometimes a high-value military product. During the test, the test personnel often have to perform operations or test work around the site, so the environmental test equipment must be operational Safety, easy operation, reliable use, long working life and other characteristics to ensure the normal conduct of the test itself. The various protection, warning measures and safety interlocks of the test equipment should be perfect and reliable to ensure the safety and reliability of the test personnel, the tested product and the test equipment itself.
Specific to the purchase of high and low temperature test chambers, and how to order high-performance equipment, we can conclude that we need to start with the details, understand the manufacturer, and understand the product configuration. The quality of the compressor in the high and low temperature test chamber directly determines the refrigeration field, the brand of the controller, the convenience of the future testing process, the material of the housing, the cleanliness and rust, the heating wire, and the direct design of the high temperature field. Then there are various fields such as circuits and waterways.
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