1. Military products are inevitably invaded with environmental conditions during production, storage, transportation and use. There are usually three situations in which such environmental conditions are invaded:
1) Climate and environmental conditions ---- high temperature, low temperature, humidity, mold, salt spray, sand dust, rain, etc.
2) Flight environment conditions----low temperature and low pressure, high temperature and low pressure, temperature shock, acceleration, vibration, impact
3) Transportation environmental conditions----collision, vibration, impact, etc.
In order to adapt to and withstand the intensification of these environmental conditions, domestic and foreign manufacturers continue to introduce their best environmental testing equipment to meet the needs of the market.
During the "Ninth Five-Year Plan" period, more than 60 units of environmental testing equipment, including more than 60 units of defense systems in seven regions (Beijing, Shanghai, Chengdu, Xi'an, Shenyang, Wuhan, Guangzhou), were put into use in the 1980s. 61%, 29% in the 1970s, and 10% in the 1960s, these test equipments have played a full role.
2. Military standards now in force
â— US military standard MIL-STO-810
â— GJB150~20-86 military equipment environmental test method
â— GB/T5170-96 electrical and electronic products environmental test equipment basic parameters verification method
â— Basic environmental test of GB 2423 electrical and electronic products
â— GB10592-89 high and low temperature test chamber technical conditions
â— GB10589-89 low temperature test chamber technical conditions
â— GB10586-89 wet heat test box technical conditions
Second, some measurement problems of environmental test equipment
1. Temperature shock test and temperature change test
Temperature shock test: This test features initial and final testing of product performance only before and after the test to determine whether the product can withstand rapid changes in temperature. It does not require the product to work during temperature changes and meet performance requirements. The high and low temperature conversion of the cryostat during the test generally stipulates that the conversion time is less than 5 minutes (this is also the indicator required for the measurement).
Temperature Change Test: A test to assess the resistance and normal working capacity of a product during temperature changes. A test chamber is used to limit the rate of temperature change. Such as: 10 ° C / min 15 ° C / min 20 ° C / min
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