The electronic hygrometer has the advantages of small size, convenient carrying, simple operation, intuitive reading and wide humidity measurement range. The accuracy of the common electronic hygrometer is 5% RH, which is mainly used for monitoring the environment with low temperature and humidity requirements; precision electronic humidity The high accuracy can reach 1.5% RH, which is mainly used in places with high humidity requirements. When using an electronic hygrometer to calibrate the constant temperature and humidity chamber at high temperature and high humidity, although the electronic hygrometer can be confirmed before each calibration, the operation is extremely cumbersome, and the electronic hygrometer is in a high temperature and high humidity environment for a long time, and the hysteresis will increase. Tests have shown that for several commonly used humidity sensors, the hysteresis is up to 3.9% RH and the minimum is 0.6% RH. When I calibrated the constant temperature and humidity test chamber, I found that a device controlled by an electronic hygrometer was qualified for humidity last year, but this year the humidity is 20% RH under high humidity conditions, but the low humidity is qualified, and the users do not know it. When the humidity sensor is faulty, it is estimated that the sensor is drifting after oversaturation, so it is not suitable for the measurement of high humidity environment in the constant temperature and humidity test chamber. However, in low humidity environment, the electronic hygrometer is used as the constant temperature. The humidity control and humidity calibration hygrometer of the constant humidity test chamber does not need to install the wet ball gauze water supply system, and there is no need to worry about the water system changing the temperature and humidity of the original temperature field. The installation is convenient and the counting is intuitive. From the current technical conditions, the electronic hygrometer is a better choice for the humidity control and calibration hygrometer of the low humidity test equipment. Shenzhen Xinmingcai Clothing Co,.Ltd , https://www.xmcsz.com