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高(gao)低(di)溫(wen)試(shi)驗箱具有加溫(wen)，降溫(wen)，加濕，降濕的(de)功能(neng)，能(neng)夠檢測出產品耐(nai)高(gao)溫(wen)，耐(nai)低(di)溫(wen)和抗濕度(du)的(de)能(neng)力，那么高(gao)低(di)溫(wen)試(shi)驗箱內(nei)的(de)溫(wen)度(du)是(shi)如何控制(zhi)的(de)呢。

加(jia)溫裝置(zhi)是(shi)控制高(gao)低溫試驗箱是(shi)否升(sheng)溫的(de)關鍵環節，控制器(qi)在得到(dao)升(sheng)溫指令時(shi)輸(shu)出電(dian)壓(ya)給繼電(dian)器(qi)，高(gao)低溫試驗箱大約3-12伏(fu)直流(liu)電(dian)加(jia)在固態繼電(dian)器(qi)上(shang)面，它的(de)交(jiao)流(liu)端(duan)相(xiang)當于導(dao)線接(jie)通，接(jie)觸器(qi)也(ye)同(tong)時(shi)吸合，加(jia)熱器(qi)兩端(duan)有電(dian)壓(ya)使其發熱，通過循環風機(ji)帶動把熱量帶到(dao)箱里，使恒(heng)溫恒(heng)濕試驗箱升(sheng)溫。

降溫(wen)(wen)是(shi)高低(di)(di)(di)溫(wen)(wen)試驗(yan)箱的重要(yao)環(huan)節(jie)，直(zhi)接影響(xiang)著一臺高低(di)(di)(di)溫(wen)(wen)及性能(neng)好壞(huai)的判定，它包(bao)括壓縮(suo)機(ji)，冷凝器(qi)(qi)(qi)，節(jie)流裝(zhuang)置，蒸發(fa)器(qi)(qi)(qi)四大組成(cheng)，壓縮(suo)機(ji)是(shi)制冷系統心臟，它吸入(ru)低(di)(di)(di)溫(wen)(wen)低(di)(di)(di)壓氣(qi)體(ti)，變成(cheng)高溫(wen)(wen)高壓氣(qi)體(ti)，通過冷凝成(cheng)液體(ti)放(fang)出(chu)熱(re)(re)量，通過風(feng)機(ji)帶走熱(re)(re)量，所(suo)以試驗(yan)箱下面是(shi)熱(re)(re)風(feng)原因，然后通過節(jie)流成(cheng)為低(di)(di)(di)壓液體(ti)，其(qi)次通過蒸發(fa)器(qi)(qi)(qi)成(cheng)為低(di)(di)(di)溫(wen)(wen)低(di)(di)(di)壓氣(qi)體(ti)*后回到壓縮(suo)機(ji)，制冷劑在(zai)蒸發(fa)器(qi)(qi)(qi)中吸收高低(di)(di)(di)溫(wen)(wen)箱熱(re)(re)量完成(cheng)氣(qi)化過程(cheng)重而吸收熱(re)(re)量，達到制冷目的，完成(cheng)高低(di)(di)(di)溫(wen)(wen)試驗(yan)箱降溫(wen)(wen)過程(cheng)。

高低溫箱升(sheng)溫及(ji)降溫速率測試程序：

在試(shi)驗(yan)(yan)箱(xiang)溫(wen)(wen)(wen)(wen)度(du)可調范(fan)圍內，選取zui低(di)(di)(di)標(biao)(biao)稱溫(wen)(wen)(wen)(wen)度(du)為zui低(di)(di)(di)降(jiang)(jiang)溫(wen)(wen)(wen)(wen)溫(wen)(wen)(wen)(wen)度(du)，zui高(gao)(gao)標(biao)(biao)稱溫(wen)(wen)(wen)(wen)度(du)為zui高(gao)(gao)升(sheng)溫(wen)(wen)(wen)(wen)溫(wen)(wen)(wen)(wen)度(du)。開啟冷(leng)源，使試(shi)驗(yan)(yan)箱(xiang)由室溫(wen)(wen)(wen)(wen)降(jiang)(jiang)到zui低(di)(di)(di)降(jiang)(jiang)溫(wen)(wen)(wen)(wen)溫(wen)(wen)(wen)(wen)度(du)，至少穩(wen)定3h后，升(sheng)到zui高(gao)(gao)升(sheng)溫(wen)(wen)(wen)(wen)溫(wen)(wen)(wen)(wen)度(du)，至少穩(wen)定3h后再降(jiang)(jiang)到zui低(di)(di)(di)降(jiang)(jiang)溫(wen)(wen)(wen)(wen)溫(wen)(wen)(wen)(wen)度(du)，升(sheng)溫(wen)(wen)(wen)(wen)和(he)(he)降(jiang)(jiang)溫(wen)(wen)(wen)(wen)期間，每分鐘記錄1次(ci)，直到試(shi)驗(yan)(yan)過程結束。高(gao)(gao)低(di)(di)(di)溫(wen)(wen)(wen)(wen)試(shi)驗(yan)(yan)箱(xiang)升(sheng)溫(wen)(wen)(wen)(wen)和(he)(he)降(jiang)(jiang)溫(wen)(wen)(wen)(wen)原理便是如此，其功能(neng)的(de)實現是通過控(kong)制系統的(de)設置來完(wan)成的(de)，了解了升(sheng)溫(wen)(wen)(wen)(wen)，降(jiang)(jiang)溫(wen)(wen)(wen)(wen)的(de)原理，在使用高(gao)(gao)低(di)(di)(di)溫(wen)(wen)(wen)(wen)試(shi)驗(yan)(yan)箱(xiang)時一定能(neng)更得心(xin)應手。