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In winter, when more than two-thirds of China’s national average temperature is below 0°C, how to ensure the reliability of the transmitter during winter storage, transportation, and work is a topic that all our reliability workers need to study. In order to meet the requirements for the use of products under low-temperature environmental conditions, the use of high and low temperature test chambers for low-temperature testing of transmitters in the production development stage is an indispensable part.
The purpose of the cryogenic test is to determine the suitability of military and civilian equipment for storage and operation at low temperatures. At present, the domestic low-temperature test for the transmitter is based on the national standard GB/T 2423.1-2008 "Electrical and electronic product environmental testing Part 2: Test method Test A: Low temperature" (equivalent to the International Electrotechnical Commission standard IEC 60068-2-1 :2007) Test the reliability of the sample at the temperature. The general steps are: pretreatment, initial inspection, conditional test, intermediate inspection, final linear temperature rise, recovery, final inspection.
The low temperature test temperature and test duration are determined by the product's environmental conditions of design and use. In order to ensure product quality, it is generally necessary to consider 20% of the amount of redundancy. Therefore, the 120% use temperature lower limit value is used to conduct an adaptive low temperature test. According to the national standard GB/T 2423.1-2008, the severity level is as shown in the following table. Show:
The Significance and Effect of Low Temperature Test on Transmitter Reliability Test
The significance of the low-temperature test: The evaluation of the transmitter can not only look at the transmission accuracy is excellent, but also to integrate its various conditions, such as in extreme environments, the reliability of its function and performance, as well as the cost of maintenance and service. In improving the reliability of the transmitter, low-temperature environmental testing occupies an important position.
The practical application of low temperature test:
For the transmitter research test: Research test is mainly used in the design and development phase of the transmitter. It is used to evaluate whether the selected components, components, design structures, and processes used meet the actual environmental requirements and exist. The problem.
Used for transmitter styling test: The styling test is used to determine whether the transmitter can achieve the specified design specifications and safety requirements under predetermined low-temperature environmental conditions.
For production inspection tests: The production inspection tests are mainly used to test the quality of the transmitter's process and the quality stability of the process change.
Acceptance test for products: Acceptance test refers to the acceptance of the transmitter product at the user site. In order to ensure the quality of the product must be tested in some projects, the acceptance test is usually carried out by sampling.
For reliability testing: Reliability testing consists of environmental testing, life testing, phenomenological testing, and special testing. Low temperature testing is an important part of environmental testing. The United States MIL-ZTD-781D clearly stipulates that environmental testing is a necessary supplement for reliability testing and an important means to improve product reliability.
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