1.    In the high and low temperature test environment test, uses should know the required test sample performance, test conditions, test procedures and test technology, technical performance, equipment structure especially the operation and performance of the controller. Also carefully read the operating manual of the test equipment, so as to avoid the failure caused by the abnormal operation of the test equipment which resulting in damaging the test samples and wrong data.

2. Reasonable choice of high and low temperature test chamber. In order to ensure the normal test, according to the different conditions of the test samples, please select the appropriate test equipment, the effective volume of the test sample and the test chamber is also to maintain a reasonable proportion. For heating test samples, the volume should not be more than 1/10 of the effective volume of the test chamber. The volume of the test sample shall not be more than 1/5 of the effective volume of the test chamber. For example, a 21` color TV in the temperature storage test, can meet the test requirements of a box of a cubic volume selection, while in power, it can not meet the requirements and should change to a bigger test chamber because the TV to dissipate heat at work.

3. Correct placement of test samples. In the high and low temperature test chamber, the position of the test sample should be placed in the same plane as the 250px above, and the multiple samples should be placed in the same plane. Samples should be placed in the air outlet and the air outlet should not be blocked, the temperature and humidity sensors should be set aside a certain distance to ensure that the test temperature is correct.

4. Correct use of damp heat test box. Wet bulb gauze with damp heat test chamber (wet bulb paper) have certain requirements, not any gauze can substitute because the relative humidity readings from root temperature and humidity difference. Strictly related to the local atmospheric pressure and wind speed. The temperature of wet bulb is related to the amount of water and evaporation on the surface of gauze. These are directly related to the quality of the gauze, so the weather, wet gauze must be woven into linen "wet bulb gauze". Otherwise, it is difficult to ensure that the wet bulb thermometer shows the value of the correct, that is, the correct humidity. Also placed wet bulb gauze are clearly defined, gauze length: 100mm, tightly wound from the humidity sensor probe, probe cup 20 - 30mm, so as to ensure the gauze immersed in water, correct and humidity control equipment.