Constant temperature and humidity box test procedure

4.1 Within the adjustable temperature range of the test chamber, select the highest nominal temperature and the lowest nominal temperature

4.2 Make the test chamber run according to the program of low temperature first and then high temperature. The temperature at the center point of the working space reaches the test temperature and is stable for 2H. The temperature of all test points is tested once in the first minute within 30 minutes, and a total of 30 tests are performed.

Data processing and test results of constant temperature and humidity box

5.1 Correct the measured temperature data according to the correction value of the test instrument

5.2 Eliminate suspicious data

5.3 Calculate the average temperature of 30 measured values per point for the data measured during the constant temperature phase

5.4 Calculate the temperature gradient: average temperature * maximum value minus average temperature * small value

5.5 Calculation of temperature fluctuation and temperature deviation

5.6 The difference between the set value of the test box control instrument and the center test value should meet the allowable deviation requirements.

Test method for temperature difference between working chamber wall and working space of constant temperature and humidity box

6.1 Placement and quantity of test points

6.1.1 Place a temperature sensor in the center of the working space, and place a surface temperature sensor on each of the geometric centers of the six inner walls of the studio in the Guangdong high and low temperature test chamber.

6.1.2 If there is a lead hole or other device in the center of the working chamber, the distance between the test point and the hole wall or other device should not be less than 100mm

6.2 Test procedure of constant temperature and humidity box

6.2.1 Within the adjustable temperature range of the test chamber, select the highest nominal temperature and the lowest nominal temperature as the test temperature

6.2.2 The temperature at the geometric center point of the working space reaches the test temperature for the first time and is stable for 2H, and the temperature value of all test points is tested every 2 minutes, a total of 5 times

6.3 Calculation and evaluation of test results

6.3.1 Correct the tested temperature value according to the correction value of the test instrument

6.3.2 Calculate the arithmetic mean of the temperature of each test point

6.3.3 Calculate the percentage of the difference between the thermodynamic temperature of the studio fairy wall and the studio