High and low temperature chamber itself as a testing equipment, carrying the test was passed or not, so the test box itself supporting the test equipment and devices should also have a detailed description:
1, Anemometer: A variety of anemometers with an induction of not less than 0.05 m / s can be used. The size of the uniform temperature inside the box determines the accuracy of the chamber. The uniformity of the chamber is ensured by the motor of the chamber Driven by the wind generated fan cycle, so the anemometer is a crucial type of test equipment.
Attached: wind speed test method: the fine cotton yarn or other floating objects hanging at the test point, turn off the door to open the fan, find out the main wind direction of each test point, the anemometer is placed at the test point, test the door closed after the test The wind speed of the main wind direction, the calculation and evaluation of the test results, the measured wind speed value shall be corrected according to the revised value of the anemometer, and the average value of wind speed at all test points shall be calculated. The value of wind speed shall be in accordance with the standard.
2, the thermometer: the use of platinum resistance, thermocouple or other similar temperature sensor and meet the following requirements of the temperature measurement system, the sensor time constant: less than 20s, the system precision: ± 0.2 ℃, the control instrument on the display temperature is through Thermometer found in the box, so the thermometer required by the national legal metrology institute accreditation, with a valid certificate of conformity and error correction.
3, hygrometer: with a hot and humid test chamber can be used wet and dry bulb thermometer or other solid state humidity sensor moisture measurement system composed of hygrometer precision should not exceed the measured humidity tolerance 1/3.
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