2、溫度范圍的選擇  
    目前，國(guo)外(wai)溫(wen)度(du)試(shi)驗(yan)箱(xiang)的范圍大(da)(da)體(ti)(ti)(ti)上為(wei)－73～＋177℃，或－70～＋180℃。國(guo)內多(duo)(duo)數(shu)廠(chang)家一般為(wei)－80～＋130℃，－60～＋130℃，－40～＋ 130℃，也(ye)有高(gao)(gao)溫(wen)到150℃。這些(xie)溫(wen)度(du)范圍通常可(ke)以滿足(zu)國(guo)內絕大(da)(da)多(duo)(duo)數(shu)軍用(yong)(yong)、民用(yong)(yong)產品溫(wen)度(du)試(shi)驗(yan)的需(xu)要(yao)，除非確(que)有特殊需(xu)要(yao)，如安裝位置靠近發動機等熱(re)源的產品外(wai)，不可(ke)盲目提高(gao)(gao)溫(wen)度(du)上限(xian)。因為(wei)上限(xian)溫(wen)度(du)越(yue)(yue)高(gao)(gao)，箱(xiang)體(ti)(ti)(ti)內外(wai)的溫(wen)差越(yue)(yue)大(da)(da)，箱(xiang)體(ti)(ti)(ti)內部流(liu)場的均勻性也(ye)越(yue)(yue)差。可(ke)利用(yong)(yong)的工作室體(ti)(ti)(ti)積也(ye)就越(yue)(yue)小。另一方面，上限(xian)溫(wen)度(du)值越(yue)(yue)高(gao)(gao)，對箱(xiang)壁夾層中保(bao)溫(wen)材(cai)料(如玻璃(li)棉等 )的耐熱(re)性要(yao)求越(yue)(yue)高(gao)(gao)。箱(xiang)體(ti)(ti)(ti)密(mi)封性的要(yao)求也(ye)越(yue)(yue)高(gao)(gao)，使箱(xiang)體(ti)(ti)(ti)的制作成本(ben)增加。   
   
    3、濕度范圍的選擇(ze)  
    國(guo)內外環境試驗箱給(gei)出的(de)濕(shi)(shi)(shi)度(du)(du)(du)指標大都(dou)是(shi)20～98％RH或30～98％RH，如果濕(shi)(shi)(shi)熱試(shi)(shi)驗(yan)箱沒(mei)有除(chu)濕(shi)(shi)(shi)系統，則濕(shi)(shi)(shi)度(du)(du)(du)范(fan)圍為(wei)(wei)(wei)(wei)60～98％，這(zhe)一類試(shi)(shi)驗(yan)箱只能(neng)做高濕(shi)(shi)(shi)試(shi)(shi)驗(yan)，但它(ta)的(de)價格低得多(duo)。值得注意的(de)是(shi)在(zai)濕(shi)(shi)(shi)度(du)(du)(du)指標后面(mian)應該注明(ming)相(xiang)(xiang)應的(de)溫(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)范(fan)圍，或給(gei)出zui低露點溫(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)。因(yin)為(wei)(wei)(wei)(wei)相(xiang)(xiang)對濕(shi)(shi)(shi)度(du)(du)(du)是(shi)與溫(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)直接相(xiang)(xiang)關的(de)，對于同(tong)樣(yang)的(de)含濕(shi)(shi)(shi)量(liang)，溫(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)越(yue)高，相(xiang)(xiang)對濕(shi)(shi)(shi)度(du)(du)(du)就越(yue)小，如含濕(shi)(shi)(shi)量(liang)為(wei)(wei)(wei)(wei)5g/Kg(指1公斤(jin)干空(kong)氣(qi)中(zhong)含有5克(ke)的(de)水(shui)蒸汽(qi))，當溫(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)為(wei)(wei)(wei)(wei)29℃時，相(xiang)(xiang)對濕(shi)(shi)(shi)度(du)(du)(du)為(wei)(wei)(wei)(wei)20％RH，溫(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)為(wei)(wei)(wei)(wei) 6℃時，相(xiang)(xiang)對濕(shi)(shi)(shi)度(du)(du)(du)為(wei)(wei)(wei)(wei)90％RH，當溫(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)降至4℃以(yi)下，相(xiang)(xiang)對濕(shi)(shi)(shi)度(du)(du)(du)超(chao)過100％，在(zai)箱體內會(hui)出現結露現象。  

上海巨也儀器設備有限公司主營抗(kang)石子(zi)沖(chong)擊(ji)儀，碎(sui)石沖(chong)擊(ji)試(shi)驗(yan)(yan)機，散熱器內(nei)部腐蝕試(shi)驗(yan)(yan)臺，恒溫(wen)恒濕(shi)試(shi)驗(yan)(yan)箱,鹽霧(wu)試(shi)驗(yan)(yan)機,紫(zi)外光耐氣候老化(hua)試(shi)驗(yan)(yan)箱,氙(xian)燈老化(hua)試(shi)驗(yan)(yan)箱，沙塵試(shi)驗(yan)(yan)箱，淋雨試(shi)驗(yan)(yan)箱，汽車內(nei)飾材料燃燒(shao)試(shi)驗(yan)(yan)機等產品(pin)，歡迎的咨詢(xun)訪問。