In recent years, the well-known manufacturers in the field of communication and electronics for environmental testing of low temperature and humidity, high temperature and humidity, rapid temperature change test requirements are more and more high, the requirements for high and low temperature test chamber also improved accordingly, this paper mainly analyzes the new requirements of low temperature and humidity and how to meet the test requirements.
The conventional range of temperature and humidity test is 25%RH to 95%RH (between 20 ° C and 85 ° C). With the development of The Times, the test requirements are becoming higher and higher, the latest mainstream temperature and humidity test range has been mostly increased to 10%RH~98%RH (between 10℃~95℃).
However, low temperature and low humidity in the consumer electronics sector still broke through the above test range. The customer's test requirements as shown in the following figure are from 35 ° C,30%RH → 35 ° C,5%RH → 25 ° C,5%RH → 10 ° C,5%RH → 35 ° C and 10%RH.
There are two difficulties in the above test requirements: one is how to achieve the temperature and humidity in the box to reach the required temperature and humidity point; the other is how to ensure the smoothness of the test curve during the conversion process.
Hongzhan technology according to customer needs, by increasing the dry air purge system, PLC expansion and a series of options to cooperate, to solve the above difficulties.
In fact, in low temperature and low humidity test, the biggest problem encountered by high and low temperature test chamber is dehumidification and temperature and humidity control.
The conventional dehumidification method is carried out through the dehumidification evaporator, and the long-term operation of the dehumidification evaporator will lead to serious frost in the evaporator. This requires the adoption of new dehumidification methods such as compressed air dry air purging.
Temperature and humidity test, Hongzhan technology to control the dew point to control the temperature and humidity method. The lowest dew point is -20℃ in the range of temperature -20℃~+10℃ and humidity 10%~50% RH.
The temperature and humidity points in the figure above have broken through the current mainstream temperature and humidity range. Dew points are mostly between -20℃ and 94℃, and some of the test dew points are even lower than -20℃, but this can be achieved. If you encounter similar testing requirements and cannot find a solution, please contact us!
50℃,5%RH, dew point 0.1℃; 40℃,5%RH, dew point -6℃;
10℃,5%RH, dew point -25.3℃; 5℃,10%RH, dew point -21.7℃;
0℃,50%RH, dew point -8.2℃; 6℃,70%RH, dew point 0.9℃;
4℃,85%RH, dew point 1.7℃; 5℃,85%RH, dew point 2.7℃;
3℃,10%RH, dew point -23.2℃; 3℃,90%RH, dew point 1.5℃;
