The high and low temperature and low pressure test chamber is based on the high and low temperature test chamber to perform vacuum processing, a test method for temperature rate change under vacuum, mainly to simulate the real environment of outer space, the pressure range is: normal pressure ～ 0.5kPa low air pressure test point is the air pressure indication point of the test box. Within the adjustable range of the test box air pressure, select the lowest test nominal air pressure value to reduce the working space in the box from normal pressure to the test air pressure value and stabilize 30min, test immediately, test once every 2min, a total of 15 times, and then test once every 30min, then test every 1h after the last time, a total of 2h.
PS: Calculation and evaluation of test results, the pressure value of the test point is corrected according to the temperature and gravity correction value of the test instrument, and the difference between the highest and lowest values ​​and the test pressure value in the 2h test data is the high and low temperature and low pressure The pressure deviation of the test box at this nominal value.
Comprehensive testing and evaluation means that when the temperature of the test point in the working space reaches the test temperature, it is stable for 2h, the pressure reduction equipment is started, and when the pressure is reduced to the test air pressure, the temperature of the air pressure is maintained for 30min at the same time, and the air pressure and temperature are tested immediately The air pressure test is performed by observing the test barometer and testing the air pressure value every 2 minutes within 30 minutes for a total of 2 hours. The temperature test refers to testing the temperature value at all points and once every 2 minutes within 30 minutes for a total of 15 times. Test again every 30 minutes, and finally test once every 1 hour for a total of 2 hours.
PS: The standard for calculation and evaluation is to correct the temperature and pressure values ​​of the test points according to the temperature and gravity correction values ​​of the test instrument. In the 2h pressure test data, the difference between the highest and lowest values ​​and the nominal pressure value is the test chamber Air pressure deviation at this nominal value.
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