Constant Damp Heat Test for Digital TV Environmental Test [Constant Temperature and Humidity Test Chamber] The method is as follows: (Extracted from Standard SJ/T11326-2006) Requirement: The sample is allowed to stand for 96h under the condition of temperature of 40 °C and relative humidity of 93%. After recovery for 4 hours, the sample shall be stipulated in 5.2, 5.3 and 5.4 of SJ/T11326 standard. Test equipment: 1. The temperature and humidity conditions of the sensor should be installed in the effective working space of the constant temperature and humidity test chamber; 2. The temperature in the effective working space of the test chamber should be maintained at 40±2 °C, and the relative humidity should be Keep in the range of 93 (2, -3)%; 3. The cool water in the test chamber should be continuously discharged, and the discharged condensed water should not be reused without purification; 4. The resistivity of water directly used to generate humidity It should be no less than 50Ωm; 5. It should ensure that the humidity and temperature in the effective working space in the test chamber are uniform and consistent with the value of the control point as much as possible; 6. The condensed water on the inner wall and the main part of the constant temperature and humidity test chamber should not drip to On the sample. Test method: 1. The sample is not packaged or energized. It is placed in a test chamber with room temperature according to the normal working position, and then the temperature of the chamber is adjusted to 40±2°C. When the sample reaches temperature stability, the humidity is added to the relative humidity. 93 (2,-3)%, shelved for 96h; 2. Reduce the relative humidity of the test chamber to 75±3% within 0.5h, then adjust the temperature of the constant temperature and humidity chamber to normal within 0.5h. Test the range of atmospheric conditions; 3, recovery for 4h, if the sample is transferred to the test chamber of normal test atmospheric conditions to recover, the time of transferring the sample should not exceed 10min; 4, finally according to SJ/T11326 standard 5.2, 5.3, 5.4 Provision is made for testing. Note: The constant damp heat test method for the above digital TV is taken from the standard SJ/T11326. ?
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