Brief description of the supporting test instruments and devices for the high and low temperature test chamber

The high and low temperature test box itself is used as a testing device, which carries the qualification of the tested test. Therefore, the test instruments and devices supporting the test box itself should also have detailed instructions:

1. Anemometer: Various anemometers with an induction of not less than 0.05 m / s can be used. The size of the temperature uniformity certificate in the box determines the accuracy of the test box, and the uniformity of the test box is guaranteed by the motor of the test box Driven by the fan to generate wind circulation, so the anemometer is a crucial type of test instrument.

Attachment: Wind speed test method: hang fine cotton yarn or other light objects at the test point, close the door and turn on the fan, find the dominant wind direction of each test point, place the anemometer at the test point, and measure each test after closing the door The wind speed value at the point leading the wind direction, the calculation and evaluation of the test results, the measured wind speed value is corrected according to the correction value of the anemometer, and the average value of the wind speed at all test points is calculated, and the value should comply with the standards.

2. Thermometer: a temperature measurement system composed of platinum resistance, thermocouple or other similar temperature sensors and meeting the following requirements, the time constant of the sensor: not more than 20s, the precision of the system: ± 0.2 ℃, the display temperature on the control instrument is passed The thermometer is detected in the box, so the thermometer needs to be qualified by the national legal measurement agency, with a valid certificate and error correction value.

3. Humidity meter: The test chamber with a damp heat system can use a wet and dry bulb thermometer or a humidity measurement system composed of other solid humidity sensors. The precision of the hygrometer should not be greater than 1/3 of the tolerance of the measured humidity. Brief description of the supporting test instruments and devices for the high and low temperature test chamber

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