According to the relevant standards, the constant temperature and humidity test chamber condition test should be carried out according to the following procedure:
1. Unless otherwise specified, place the unpackaged and non-energized test samples in the "ready to use" state in the test box. The test box and test samples are under standard atmospheric environmental conditions. At specific times, allow The test sample is placed in the test box when the test conditions are reached, and the sample should be prevented from generating condensation. For small samples, this requirement can be achieved by preheating;
2. Adjust the temperature in the constant temperature and humidity test chamber to reach the required severity level, and make the sample reach temperature stability. The definition of temperature stability is specified in 4.8 of GB / T 2421-1999, and the rate of temperature change does not exceed 1K / min, the average time to reach temperature stability does not exceed 5min, and sample condensation should not occur during this process;
3. In this process, you can avoid the occurrence of sample condensation by not increasing the absolute humidity in the box;
4. Within 2H, reach the specified test severity level by adjusting the humidity in the box;
5. The sample is exposed to the test conditions required by the specified test level. After the temperature and relative humidity in the working space reach the specified value and stabilize, the test duration is calculated;
6. The relevant specifications stipulate the test conditions and test duration;
7. The tested samples should be restored after the test.
Attachment: Severe grade of constant temperature and humidity test chamber:
The severity level of the test chamber indicates the range of temperature and humidity of the test chamber, which is determined by the test duration, temperature, and relative humidity. Unless the relevant specifications stipulate, the temperature and relative humidity of the test should be selected from the following four combinations:
a, 30 ± 2 ℃, 93 ± 3%
b, 30 ± 2 ℃, 85 ± 3%
c, 40 ± 2 ℃, 93 ± 3%
d, 40 ± 2 ℃, 85 ± 3%
Considering the absolute error during the test, the temperature gradient and the temperature difference in the working space, the temperature tolerance specified in the standard is ± 2K. In order to maintain the relative humidity in the test chamber within the specified tolerance range, the The temperature difference between any two points is as small as possible at any time. If the temperature difference exceeds 1K, the required humidity conditions cannot be achieved. Short-term temperature fluctuations must also be kept within ± 0.5K to maintain the required humidity conditions.
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