Hot and cold shock test chamberThe performance evaluation is divided5Point:

I,Environment of test area:

The environment around the cold and heat shock test chamber can affect the conditions inside the test chamber. The performance of the test chamber should be determined under standard atmospheric conditions. The following requirements should be considered: surrounding use conditions, no direct exposure to sunlight, no exposure to electromagnetic interference, horizontal placement, rotation in a place free from mechanical vibration and sound vibration interference, and the recommendations of the test chamber manufacturer on power and environmental conditions should be considered, details are issued by the Linpin Stock Center.“Site Confirmation Letter”Mainly.

II,Temperature measurement system: The uncertainty of the measurement system is determined by the calibration of the system, in general, the sensor should be resistive or thermocouple type, the sensor in the air.50%The response time should be10s-40sbetween, the response time of the entire system should be less40s.

3.Hot and cold shock test chamberThe test load of: We will have notes in all technical data (the following technical indexes are measured under no-load conditions). If the test box cannot be completely empty, it should be recorded. Whether the tested samples in the box have calorific value, weight, quantity, placement density and arrangement sequence have influence.

4.Installation of temperature sensor: the temperature measurement sensor is located in each corner of the test box and the center of the working space. our industry has the factory inspection standard of nine-point inspection instrument, so the box should be at least distributed9sensors,2000LFor the above high and low temperature test boxes, sensors should be placed directly in front of the center of each box wall (considering the large space in the box, in order to achieve accurate uniformity, at least cloth should be placed in the box15A sensor), the distribution of the measurement system shall not affect the temperature distribution of the no-load test chamber, and shall be able to record the actual arrival temperature. For the confirmation detection system, the data shall be recorded at least once every minute, and the data recording device of the test chamber monitoring sensor shall be independent of the test chamber control system.

5.Temperature performance determination: After the test chamber is stable, the actual temperature, temperature fluctuation and temperature gradient of the working space are confirmed according to the measurement results of the measurement system, and the uncertainty of the temperature measurement system should be considered.

Attachment: In order to determine the temperature change rate, the test chamber should be adjusted to the specified temperature or the test chamber should be adjusted to the specified temperature, and the monitoring temperature should be within the temperature range.10%The temperature point rises90%The temperature point of the time, so that the test box is stable, the test box will be adjusted to the specified temperature, monitoring the temperature from the temperature range.90%The temperature point drops10%The time of the temperature point is what we often call the temperature rise and fall speed (here is the average value of the whole process). Hongjin Technology can also set the linear temperature rise and fall according to the user's requirements.1-20Degree/min(The technical term in the instrument setting is“Slope”）。