[恒溫恒濕試驗箱]可程式恒溫(wen)恒濕(shi)試(shi)驗箱(xiang)試(shi)驗時要(yao)考慮的(de)問題

　　1.可程式恒溫恒濕試驗箱(xiang)內(nei)空間容積與樣品體(ti)積的比值應不(bu)小(xiao)于(yu) 3∶1，使(shi)工作室(shi)有足夠的熱容量。此外(wai)，箱(xiang)內(nei)樣品的擺放位(wei)置不(bu)能(neng)阻礙空氣的對流(liu)，應居中放置，以免讓箱(xiang)內(nei)溫濕度效能(neng)降低。

　　2.如(ru)果(guo)可程(cheng)式恒溫(wen)(wen)恒濕(shi)(shi)試(shi)(shi)驗(yan)(yan)箱(xiang)用戶測試(shi)(shi)條件是從(cong)(cong)常溫(wen)(wen)先進入高溫(wen)(wen)，然(ran)后從(cong)(cong)高溫(wen)(wen)轉入低(di)溫(wen)(wen)，按這(zhe)一(yi)做法，試(shi)(shi)驗(yan)(yan)結(jie)束時(shi)產(chan)品(pin)正處于從(cong)(cong)低(di)溫(wen)(wen)到常溫(wen)(wen)的(de)過程(cheng)。此時(shi)直(zhi)接將樣(yang)品(pin)取出，往往在(zai)其內外(wai)表面會產(chan)生凝露或(huo)濕(shi)(shi)潤，容易對(dui)樣(yang)品(pin)*終結(jie)果(guo)造成不(bu)佳影響，因(yin)此需(xu)要恒溫(wen)(wen)恒濕(shi)(shi)試(shi)(shi)驗(yan)(yan)箱(xiang)設(she)置(zhi)50℃的(de)高溫(wen)(wen)下恢(hui)復，從(cong)(cong)而加長(chang)試(shi)(shi)驗(yan)(yan)周期(qi)。因(yin)此，在(zai)進行試(shi)(shi)驗(yan)(yan)時(shi)，為(wei)減少試(shi)(shi)驗(yan)(yan)周期(qi)，可以先從(cong)(cong)低(di)溫(wen)(wen)開(kai)始，這(zhe)樣(yang)，試(shi)(shi)驗(yan)(yan)結(jie)束時(shi)，樣(yang)品(pin)正處于從(cong)(cong)高溫(wen)(wen)到常溫(wen)(wen)的(de)過程(cheng)，從(cong)(cong)而避(bi)免(mian)樣(yang)品(pin)內外(wai)表面產(chan)生凝露或(huo)濕(shi)(shi)潤。

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