全面講解關于恒溫恒濕試驗箱的四種交變試驗程序
 

恒溫恒濕試驗箱做交變濕熱試驗時，有四種試驗程序。下面由恒溫恒濕試驗箱生產專家-北京鴻達天矩試驗設備有限公司為大家介紹下具體有哪四種程序： 
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）、升溫階段：在3±0.5h內，將工作空間的溫度連續升至有關標準規定的高溫值，升溫速率應限定在標準規范的范圍內，在該階段，除后15min相對濕度可不低于90%外，其余時間的相對濕度應不低于95%，以便使試驗樣品產生凝露，但大型試驗樣品不得產生過量的凝露； 
（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）、降溫階段：將工作空間的溫度在3至6h內由40±2℃（或55±2℃）降至25±3℃，降溫速率應限定在標準時間范圍內，值得注意的是，在降溫開始后的1.5h內的降溫速率是在3h±15min內，溫度由40±2℃或55±2℃降至25±3℃的降溫速率，在該階段相對濕度有兩種變化方式：變化1除初15min相對濕度應不低于90%外，其余時間均應不低于95%；變化2：允許相對濕度不低于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）、高溫高濕恒定階段：將工作空間的溫度維持在40±2℃（或55±2℃）的范圍內，直到從升溫階段開始算起滿12±0.5h為止，在該階段，除初和后15min的相對濕度應不低于90外，其余時間均應為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）、低溫高濕恒定階段：將恒溫恒濕試驗箱工作空間的溫度維持在25±3℃，相對濕度應不低于95%，直至從升溫階段開始算起滿24h為止。 
（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.