[恒溫恒濕試驗箱]恒(heng)溫(wen)恒(heng)濕試驗箱工作空間溫(wen)度場偏(pian)差的定義

　　恒(heng)溫(wen)(wen)(wen)恒(heng)濕(shi)試(shi)驗箱在(zai)(zai)高狀態下(xia)應該是(shi)絕對恒(heng)溫(wen)(wen)(wen)的(de)，但在(zai)(zai)實際試(shi)驗中，試(shi)驗箱溫(wen)(wen)(wen)度場沿某一溫(wen)(wen)(wen)度上下(xia)波動(dong)，又由于溫(wen)(wen)(wen)度場不是(shi)一個點而(er)是(shi)一個空(kong)間(jian)，在(zai)(zai)熱(re)對流和熱(re)輻(fu)射等方(fang)面的(de)影響下(xia)，工作空(kong)間(jian)各點溫(wen)(wen)(wen)度不可能絕對均勻。另外(wai)，試(shi)驗箱控溫(wen)(wen)(wen)儀只感受其所在(zai)(zai)位置(zhi)的(de)溫(wen)(wen)(wen)度，并(bing)由此控制加熱(re)器，因而(er)工作空(kong)間(jian)各點溫(wen)(wen)(wen)度不可能數值統一，同時與顯示值之間(jian)也(ye)存(cun)在(zai)(zai)著一定的(de)偏差。

　　恒溫(wen)恒濕試驗箱(xiang)工作空間(jian)溫(wen)度(du)場是(shi)一個(ge)隨(sui)時間(jian)和空間(jian)變化(hua)的不穩定(ding)溫(wen)度(du)場。所(suo)謂溫(wen)度(du)偏差(cha)就(jiu)是(shi)對這個(ge)溫(wen)度(du)場的要(yao)求。它主要(yao)包含(han)三個(ge)方面的內容：

　　1、溫(wen)度波動(dong)度：試(shi)驗箱在穩定(ding)狀(zhuang)態下，工(gong)作空(kong)間內任意一(yi)點溫(wen)度隨時間的(de)變化(hua)量。

　　2、溫度(du)均勻度(du)：試驗箱在穩定狀(zhuang)態下(xia)，工作空間在某一瞬(shun)時各測試點溫度(du)之間的差值。

　　3、溫度(du)偏差：就是(shi)環境試驗設備在穩定狀態(tai)下(xia)，顯(xian)示溫度(du)平(ping)均值與工作空(kong)間(jian)中心點測溫度(du)平(ping)均值與工作空(kong)間(jian)中心點溫度(du)平(ping)均值的差值。

　　如(ru)用MC81型(xing)號(hao)恒溫(wen)(wen)恒濕試驗(yan)箱做高溫(wen)(wen)試驗(yan)時(shi)，要求溫(wen)(wen)度(du)等級為+85℃±2℃。其(qi)信訪就是無論工(gong)作(zuo)空間的工(gong)作(zuo)條件(jian)如(ru)何(he)組合和(he)變化，在整(zheng)個試驗(yan)時(shi)間內(nei)和(he)放置樣品(pin)的任何(he)區(qu)域(yu)內(nei)，溫(wen)(wen)度(du)場的溫(wen)(wen)度(du)都應保持在+83℃-+87℃之間。

　　注(zhu)：恒溫恒濕試(shi)(shi)驗(yan)(yan)(yan)(yan)箱低溫試(shi)(shi)驗(yan)(yan)(yan)(yan)中規定溫度(du)允許偏(pian)差(cha)(cha)范圍±3℃的(de)(de)。試(shi)(shi)驗(yan)(yan)(yan)(yan)箱(室(shi))工作空間的(de)(de)試(shi)(shi)驗(yan)(yan)(yan)(yan)溫度(du)是否(fou)均勻是一(yi)(yi)個非常(chang)重要的(de)(de)問題，因為如(ru)果(guo)溫度(du)不均勻超(chao)過了允許偏(pian)差(cha)(cha)，則(ze)受試(shi)(shi)樣(yang)品的(de)(de)試(shi)(shi)驗(yan)(yan)(yan)(yan)條(tiao)件(jian)達不到一(yi)(yi)致，有的(de)(de)樣(yang)品或樣(yang)品某一(yi)(yi)部分，試(shi)(shi)驗(yan)(yan)(yan)(yan)溫度(du)偏(pian)高(gao)，有旋塞閥的(de)(de)偏(pian)低，從而產生(sheng)過試(shi)(shi)驗(yan)(yan)(yan)(yan)或欠(qian)試(shi)(shi)驗(yan)(yan)(yan)(yan)的(de)(de)問題，使試(shi)(shi)驗(yan)(yan)(yan)(yan)的(de)(de)再(zai)現性差(cha)(cha)，試(shi)(shi)驗(yan)(yan)(yan)(yan)得出的(de)(de)數(shu)據(ju)不可靠(kao)，最終使試(shi)(shi)驗(yan)(yan)(yan)(yan)歸于失敗。

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