The constant temperature and humidity test chamber and its measurement system shall meet the following requirements:
1. A sensor for monitoring the temperature and humidity conditions should be installed in the working space. For the steady-state damp heat test of the heat dissipation sample, the placement of the sensor in the working space should be carried out in accordance with the relevant provisions of GB / T2421-1999.
2. The temperature and relative humidity in the working space should take into account the influence of the sample, and its value still changes within the specified tolerance range. The temperature tolerance given in Chapter 5 of the standard takes into account the absolute measurement Errors and temperature gradients. For heat dissipation samples, the temperature and relative humidity near the sample are affected by the sample itself, which is different from the data measured at the location specified in GB / T 2421-1999.
The condensed water in the constant temperature and humidity test box should be continuously excluded from the test box. The unpurified water cannot be reused. The condensed water on the inner wall and top of the test box should not drip onto the test sample. The resistivity of the humidity water in the box should be Keep it not less than 500 ohms, the test sample cannot be directly radiated from the heating element of the test box. In the test box with a spray system, the sample should be away from the injection port, and the moisture should not be sprayed directly on the sample. The volume of the test box is at least 5 times the volume of the heat dissipation sample. The distance between the test sample and the wall of the test box should be carried out in accordance with the provisions of Appendix A of GB / T 2423.2-2001. The relevant specifications stipulate the mounting frame of the test sample, and can reproduce or simulate the thermal characteristics of the sample in actual use. If these conditions cannot be met, the mounting frame should minimize the effect of heat and humidity exchange between the sample and its surrounding environment.
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