Humidity control system of environmental testing chamber and control method thereof

Abstract

The invention discloses a humidity control system of an environmental testing chamber. The system comprises a humidification portion, a dehumidification portion and a control portion. The control portion includes a supervisory control computer, a control station, and an alarm; the supervisory control computer informs the control station of various operations of a user through serial communication as well as receives various parameters returned by the control station, wherein the various parameters include humidity, a humidification output, a dehumidification output and an alarm output and the like; and the control station is respectively electrically connected with a temperature sensor, the alarm, an ultrasonic humidification portion and a nitrogen dehumidification portion. According to the invention, an ultrasonic humidification portion and a nitrogen dehumidification portion are added, so that a problem of superheated steam in a steam humidification method can be effectively solved; there is no need to carry out water boiling, thereby shortening humidification time; and the response of the system is more sensitive; besides, the nitrogen dehumidification portion has a simple structure and an occurrence of a water accumulation phenomenon in the testing chamber can be reduced.

Description

technical field [0001] The invention belongs to the field of environmental testing. Specifically, the present invention relates to a control system and a control method for adding a humidity function on a temperature test box. The method can be used for humidity control of the temperature test box. Advanced humidification and dehumidification methods transform the temperature test chamber into a temperature and humidity test chamber. Background technique [0002] In order to test the environmental adaptability of electronic and electrical products, damp heat tests are usually required. National standards, national military standards and various industries have formulated relevant test standards. The damp heat test is generally completed in the environmental test chamber, and the environmental test chamber is controlled by the humidity control system so that the humidity value in the chamber meets the requirements of the test conditions. [0003] Usually, the existing humid...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that when the test sample generates a large amount of heat, the refrigerator needs to work continuously to make the temperature in the box meet the requirements, but it is difficult to meet the requirements of high humidity conditions.

However, during low temperature and high humidity tests, a large amount of frost will form on the condenser

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