全面讲解关于恒温恒湿试验箱的四种交变试验程序
 

恒温恒湿试验箱做交变湿热试验时，有四种试验程序。下面由恒温恒湿试验箱生产专家-北京鸿达天矩试验设备有限公司为大家介绍下具体有哪四种程序： 
Constant temperature and humidity test chamber for alternating hot and humid trials, there are four test procedure. By constant temperature and humidity test chamber below production experts - Beijing hong da day under the torque testing equipment co., LTD., to introduce the specific what are the four procedures:

（一）、升温阶段：在3±0.5h内，将工作空间的温度连续升至有关标准规定的高温值，升温速率应限定在标准规范的范围内，在该阶段，除后15min相对湿度可不低于90%外，其余时间的相对湿度应不低于95%，以便使试验样品产生凝露，但大型试验样品不得产生过量的凝露； 
（1） and temperature stage: within 3 + / - 0.5 h, the temperature of working space continuous rise to high temperature value of the relevant standards, the heating rate should be limited within the scope of the standard specification, at this stage, except the last 15 min relative humidity is lower than 90%, the relative humidity of the rest of the time should be not less than 95%, in order to make the test sample produces condensation, but big test samples shall not produce excess gel;

（二）、降温阶段：将工作空间的温度在3至6h内由40±2℃（或55±2℃）降至25±3℃，降温速率应限定在标准时间范围内，值得注意的是，在降温开始后的1.5h内的降温速率是在3h±15min内，温度由40±2℃或55±2℃降至25±3℃的降温速率，在该阶段相对湿度有两种变化方式：变化1除初15min相对湿度应不低于90%外，其余时间均应不低于95%；变化2：允许相对湿度不低于85%。
（2）, the cooling stage, the temperature of working space within 3 to 6 h by 40 plus or minus 2 ℃ （or 55 + 2 ℃） to 25 + / - 3 ℃, the cooling rate should be limited within the scope of the standard time, it is important to note that within 1.5 h after the start of the cooling rate of cooling is within 3 h + 15 min, 40 plus or minus temperature by 2 to 55 + 2 ℃ to 25 ℃ and + 3 ℃ cooling rate, there are two kinds of relative humidity in the phase change: change 1 in addition to the first 15 min relative humidity should be not less than 90%, the rest of the time shall be no less than 95%. Change 2: allows of no less than 85% relative humidity.

（三）、高温高湿恒定阶段：将工作空间的温度维持在40±2℃（或55±2℃）的范围内，直到从升温阶段开始算起满12±0.5h为止，在该阶段，除初和后15min的相对湿度应不低于90外，其余时间均应为93±3%。
（3）, high temperature and high humidity constant phase: to maintain the temperature of the working space at 40 + 2 ℃ （or 55 + 2 ℃）, within the scope of the until will be backdated to temperature stage 12 + / - 0.5 h, at this stage, in addition to the first and the last 15 min relative humidity should be not less than 90, the rest of the time should be 93 + / - 3%.

（四）、低温高湿恒定阶段：将恒温恒湿试验箱工作空间的温度维持在25±3℃，相对湿度应不低于95%，直至从升温阶段开始算起满24h为止。 
（4）, low temperature and humidity constant phase: to maintain the temperature of constant temperature and humidity test chamber working space in 25 + / - 3 ℃, relative humidity should be not less than 95%, until will be backdated to temperature stage full 24 h.