高(gao)低溫濕熱(re)(re)交(jiao)變(bian)試驗箱由箱體、風循環系(xi)統(tong)(tong)、制(zhi)冷系(xi)統(tong)(tong)、加(jia)溫系(xi)統(tong)(tong)和(he)(he)控(kong)濕系(xi)統(tong)(tong)組成。風循環系(xi)統(tong)(tong)一般采用(yong)可調(diao)節送風方(fang)(fang)向的結(jie)構(gou)；加(jia)濕系(xi)統(tong)(tong)有采用(yong)鍋爐加(jia)濕的和(he)(he)表面(mian)(mian)蒸發二(er)種；降溫、去濕系(xi)統(tong)(tong)采用(yong)空調(diao)工況制(zhi)冷結(jie)構(gou)；加(jia)熱(re)(re)系(xi)統(tong)(tong)采用(yong)電(dian)(dian)熱(re)(re)鰭(qi)片加(jia)熱(re)(re)和(he)(he)電(dian)(dian)爐絲(si)直接(jie)加(jia)熱(re)(re)二(er)種結(jie)構(gou)；溫濕度測試方(fang)(fang)法采用(yong)干(gan)濕球(qiu)測試方(fang)(fang)法，也(ye)有用(yong)濕度傳(chuan)感(gan)器(qi)(qi)直接(jie)測量方(fang)(fang)法；控(kong)制(zhi)和(he)(he)顯示操(cao)作界面(mian)(mian)采用(yong)溫濕度分開獨立和(he)(he)溫濕度組合(he)控(kong)制(zhi)器(qi)(qi)等方(fang)(fang)式(shi)。

　　在(zai)做高溫(wen)(wen)試驗(yan)中，如(ru)(ru)溫(wen)(wen)度(du)變(bian)化達(da)不到試驗(yan)溫(wen)(wen)度(du)值時，可以檢查(cha)電器系(xi)統，逐一排除故(gu)(gu)障。如(ru)(ru)溫(wen)(wen)度(du)升得很慢，就要查(cha)看(kan)風循環系(xi)統，看(kan)一下風循環的(de)(de)調節擋(dang)板(ban)是否(fou)開啟正(zheng)常，反之，就檢查(cha)風循環的(de)(de)電機運(yun)轉是否(fou)正(zheng)常。如(ru)(ru)溫(wen)(wen)度(du)過沖厲害那么就需要整定PID的(de)(de)設置(zhi)參(can)數。如(ru)(ru)果(guo)溫(wen)(wen)度(du)直接(jie)上升，過溫(wen)(wen)保(bao)護(hu)，那么，控制器出故(gu)(gu)障，須更換(huan)控制儀表。

　　在做(zuo)低溫(wen)試(shi)驗(yan)中(zhong)(zhong)達不到(dao)試(shi)驗(yan)的(de)(de)指標，那你(ni)就要觀察溫(wen)度(du)的(de)(de)變(bian)化，是(shi)溫(wen)度(du)降的(de)(de)很(hen)慢，還是(shi)溫(wen)度(du)到(dao)一定值(zhi)后溫(wen)度(du)有(you)回升的(de)(de)趨勢，前(qian)者(zhe)就要檢(jian)查(cha)一下，做(zuo)低溫(wen)試(shi)驗(yan)前(qian)是(shi)否將(jiang)工(gong)(gong)作(zuo)室(shi)烘(hong)干，使工(gong)(gong)作(zuo)室(shi)保持干燥后再(zai)(zai)將(jiang)試(shi)驗(yan)樣品放(fang)(fang)入(ru)工(gong)(gong)作(zuo)室(shi)內再(zai)(zai)做(zuo)試(shi)驗(yan)，工(gong)(gong)作(zuo)室(shi)內的(de)(de)試(shi)驗(yan)樣品是(shi)否放(fang)(fang)置(zhi)的(de)(de)過多，使工(gong)(gong)作(zuo)室(shi)內的(de)(de)風不能充分循環(huan)，在排除上述原(yuan)因后，就要考慮是(shi)否是(shi)制冷系統(tong)中(zhong)(zhong)的(de)(de)故(gu)障了，這(zhe)樣就要請(qing)廠家的(de)(de)專業人員進行檢(jian)修(xiu)。后者(zhe)的(de)(de)現象是(shi)設(she)備的(de)(de)使用(yong)環(huan)境不好(hao)所(suo)致，設(she)備放(fang)(fang)置(zhi)的(de)(de)環(huan)境溫(wen)度(du)，放(fang)(fang)置(zhi)的(de)(de)位置(zhi)（箱體后與墻(qiang)的(de)(de)距離）要滿足要求（在設(she)備操(cao)作(zuo)使用(yong)說明(ming)中(zhong)(zhong)都有(you)規定）。