Precautions for high and low temperature test chamber (2)

1. Use of damp heat test chamber

Wet ball gauze (wet ball paper) used in the damp heat test box has certain requirements, not any gauze can be substituted, because the relative humidity reading is the difference between the root distance and the temperature and humidity, strictly speaking, it is also related to the local atmospheric pressure and wind speed at that time . The indicated value of the wet bulb temperature is related to the amount of water absorbed by the gauze and the surface evaporation. These are directly related to the quality of the gauze. The wet ball gauze is a special "wet ball gauze" woven from flax. In order not to cause the wet bulb thermometer (humidity) to be incorrect, the gauze length of the wet bulb gauze: 100mm, tightly wound the sensor probe, the probe is 20-30mm away from the humidity water cup, and the gauze is immersed in the water cup to ensure the correctness of the equipment control and the humidity Correctness.

2. The medium environment test is correctly added to the high and low temperature test chamber test

If there are certain requirements for the water used in the damp heat test box, the resistivity of the water used in the test box should not be less than 500 ohms. Generally, the resistivity of tap water is 10-100 ohms, the resistivity of distilled water is 100-10000 ohms, and the resistivity of deionized water is 10,000-100000 ohms. Use distilled or deionized water for damp heat test, and it must be fresh, because when water comes in contact with air, it is easily polluted by carbon dioxide and dust. Water has the property of dissolving many substances. After a long period of time, the resistivity is better. decline.