1.小型高低溫濕熱試驗箱的構成

　　小型高低(di)溫濕(shi)熱(re)試驗(yan)箱由箱體、風循環(huan)系(xi)統、制冷系(xi)統、加(jia)溫系(xi)統和控濕(shi)系(xi)統組成。

　　風循(xun)環系統(tong)一般采(cai)用可調(diao)節送風方(fang)(fang)向的結構;加(jia)(jia)濕(shi)系統(tong)有(you)采(cai)用鍋爐(lu)加(jia)(jia)濕(shi)的和(he)(he)表面蒸發二種;降(jiang)溫(wen)、去濕(shi)系統(tong)采(cai)用空(kong)調(diao)工況制冷結構;加(jia)(jia)熱(re)系統(tong)采(cai)用電熱(re)鰭片加(jia)(jia)熱(re)和(he)(he)電爐(lu)絲直接加(jia)(jia)熱(re)二種結構;溫(wen)濕(shi)度測(ce)(ce)試(shi)方(fang)(fang)法采(cai)用干濕(shi)球測(ce)(ce)試(shi)方(fang)(fang)法，也(ye)有(you)用濕(shi)度傳感器直接測(ce)(ce)量方(fang)(fang)法;控(kong)制和(he)(he)顯示操(cao)作界面采(cai)用溫(wen)濕(shi)度分開獨立和(he)(he)溫(wen)濕(shi)度組合控(kong)制器等方(fang)(fang)式。

　　2.小型高(gao)低溫濕熱(re)試(shi)驗(yan)箱控制方式的選擇

　　溫(wen)(wen)度(du)、濕度(du)試(shi)(shi)(shi)驗(yan)(yan)箱(xiang)有(you)恒(heng)(heng)定試(shi)(shi)(shi)驗(yan)(yan)箱(xiang)、交變試(shi)(shi)(shi)驗(yan)(yan)箱(xiang)兩種情況。普通的(de)(de)高(gao)低溫(wen)(wen)試(shi)(shi)(shi)驗(yan)(yan)箱(xiang)一(yi)般指的(de)(de)是(shi)恒(heng)(heng)定高(gao)低溫(wen)(wen)試(shi)(shi)(shi)驗(yan)(yan)箱(xiang)，其控(kong)(kong)制(zhi)(zhi)方式為(wei)：設(she)定一(yi)個目標溫(wen)(wen)度(du)，高(gao)低溫(wen)(wen)濕熱(re)試(shi)(shi)(shi)驗(yan)(yan)箱(xiang)具(ju)有(you)自(zi)動(dong)恒(heng)(heng)溫(wen)(wen)到(dao)目標溫(wen)(wen)度(du)點的(de)(de)能力。小型(xing)高(gao)低溫(wen)(wen)濕熱(re)試(shi)(shi)(shi)驗(yan)(yan)箱(xiang)的(de)(de)控(kong)(kong)制(zhi)(zhi)控(kong)(kong)制(zhi)(zhi)方式也類(lei)似，設(she)定一(yi)個目標溫(wen)(wen)度(du)、濕度(du)點，試(shi)(shi)(shi)驗(yan)(yan)箱(xiang)具(ju)有(you)自(zi)動(dong)恒(heng)(heng)溫(wen)(wen)到(dao)目標溫(wen)(wen)度(du)、濕度(du)點的(de)(de)能力。

　　小型(xing)高(gao)低溫(wen)(wen)(wen)濕熱試驗箱具有(you)(you)設定一條(tiao)或者(zhe)多條(tiao)高(gao)低溫(wen)(wen)(wen)變化(hua)、循環的(de)(de)(de)程序，試驗箱有(you)(you)能力根據(ju)(ju)預(yu)(yu)置(zhi)的(de)(de)(de)曲線完成試驗過程，并(bing)且可以(yi)在zui大(da)升溫(wen)(wen)(wen)、降溫(wen)(wen)(wen)速(su)率能力的(de)(de)(de)范圍內，控制升溫(wen)(wen)(wen)、降溫(wen)(wen)(wen)的(de)(de)(de)速(su)率，即可以(yi)根據(ju)(ju)設定的(de)(de)(de)曲線的(de)(de)(de)斜率控制升溫(wen)(wen)(wen)、降溫(wen)(wen)(wen)速(su)率。同樣，高(gao)低溫(wen)(wen)(wen)交變濕熱試驗箱也具有(you)(you)預(yu)(yu)置(zhi)溫(wen)(wen)(wen)度、濕度曲線，并(bing)且根據(ju)(ju)預(yu)(yu)置(zhi)進行(xing)控制的(de)(de)(de)能力。

　　當然，小型高(gao)(gao)低溫濕熱試(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)箱(xiang)(xiang)都具有恒(heng)定試(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)箱(xiang)(xiang)的(de)功能，但交(jiao)變(bian)(bian)試(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)箱(xiang)(xiang)的(de)制造成(cheng)本(ben)較(jiao)高(gao)(gao)，因(yin)為(wei)交(jiao)變(bian)(bian)試(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)箱(xiang)(xiang)需配置(zhi)有曲線自(zi)動記錄裝置(zhi)、程(cheng)序控制儀，還須解決試(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)箱(xiang)(xiang)在工作室內(nei)溫度較(jiao)高(gao)(gao)的(de)情況下開啟制冷機等問題，所(suo)以交(jiao)變(bian)(bian)試(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)箱(xiang)(xiang)的(de)價格比恒(heng)定試(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)箱(xiang)(xiang)的(de)價格一般要(yao)高(gao)(gao)20%以上。因(yin)此，我(wo)們應當實(shi)事求(qiu)是的(de)以試(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)方法的(de)需要(yao)為(wei)出發點，選用恒(heng)定試(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)箱(xiang)(xiang)或者是交(jiao)變(bian)(bian)試(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)箱(xiang)(xiang)。

　　了解以上內容，可以幫助操作者(zhe)更好的選擇使用小型高低溫(wen)濕熱(re)試驗(yan)箱。