Acceptance test method for high and low temperature test chamber

1. Main test instruments and devices:

1.1 Anemometer: an anemometer whose sensing capacity should not be less than 0.05m/s

1.2 Thermometer: a temperature measurement system composed of platinum resistance, thermocouple or other similar temperature sensors and meets the following requirements: sensor time constant: 20S~40S; extended uncertainty of the temperature measurement system (K=2): no more than 0.4 °C

1.3 Surface thermometer: a measurement system consisting of platinum resistance or other similar sensors and meeting the following requirements: sensor time constant: 20S~40S; extended uncertainty of the temperature measurement system (K=2): not more than 1.0℃

2. Test conditions

2.1 high and low temperature test chamber The test is carried out under no-load conditions

2.2 high and low temperature test chamber During the cooling rate test, the ambient temperature should not be higher than 25℃, and the cold power temperature should not be higher than 30℃

Three, temperature test method

3.1 high and low temperature test chamber Location and number of test points

3.1.1 In the content of the test chamber studio, three horizontal test surfaces, namely the upper, middle and lower floors, are set for the upper, middle and lower floors. The distance between the upper floor and the top surface of the studio is 1/10 of the height of the studio, and the middle floor passes through the studio. Geometric center, the lower layer is 10mm above the sample holder of the lowest layer.

3.1.2 The test points are located on the three test surfaces, the central test point is located at the geometric center of the studio, and the distance between the remaining test points and the wall of the studio is 1/10 of their respective side lengths, but for the volume of the studio not greater than 1 cubic meter Test box, the distance is not less than 50mm

3.1.3 The relationship between the number of test points and the size of the working chamber is: when the working chamber volume is not more than 2 cubic meters, there are 9 test points; when the working chamber volume is greater than 2 cubic meters, the test points are 15; When the volume is greater than 50 cubic meters, the number of temperature test points can be appropriately increased