可程式恒溫恒濕試驗箱在測試期間遇到狀況怎樣處理

可程式恒溫恒濕試驗箱在測試期間遇到狀況怎樣處理

      恒(heng)溫恒(heng)濕(shi)試(shi)驗箱(xiang) 中(zhong)斷的(de)(de)處理在 GJB 150 中(zhong)有明(ming)確規(gui)定，它(ta)將試(shi)驗中(zhong)斷分為(wei)三種(zhong)情(qing)況考(kao)慮，即容差范圍內的(de)(de)中(zhong)斷、欠試(shi)驗條件中(zhong)斷和過(guo)試(shi)驗條件中(zhong)斷，不(bu)(bu)同的(de)(de)情(qing)況有不(bu)(bu)同的(de)(de)處理方法。

     對(dui)容差(cha)范圍內(nei)(nei)的(de)(de)(de)(de)中(zhong)(zhong)(zhong)斷(duan)(duan)(duan)(duan)，當(dang)中(zhong)(zhong)(zhong)斷(duan)(duan)(duan)(duan)期間試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)條(tiao)件(jian)(jian)(jian)(jian)沒有超出(chu)允(yun)許(xu)誤(wu)差(cha)范圍時(shi)(shi)(shi)(shi)，中(zhong)(zhong)(zhong)斷(duan)(duan)(duan)(duan)時(shi)(shi)(shi)(shi)間應作為總試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)時(shi)(shi)(shi)(shi)間的(de)(de)(de)(de)一部(bu)分；對(dui)欠試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)條(tiao)件(jian)(jian)(jian)(jian)的(de)(de)(de)(de)中(zhong)(zhong)(zhong)斷(duan)(duan)(duan)(duan)，當(dang)試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)條(tiao)件(jian)(jian)(jian)(jian)低于允(yun)許(xu)誤(wu)差(cha)下限時(shi)(shi)(shi)(shi)，應從低于試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)條(tiao)件(jian)(jian)(jian)(jian)的(de)(de)(de)(de)點重新達到預(yu)先規定(ding)(ding)的(de)(de)(de)(de)試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)條(tiao)件(jian)(jian)(jian)(jian)，恢復(fu)試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)，一直(zhi)進行(xing)到完成(cheng)預(yu)定(ding)(ding)的(de)(de)(de)(de)試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)周期；對(dui)過(guo)試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)樣品(pin)重做(zuo)(zuo)，如(ru)(ru)果過(guo)試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)條(tiao)件(jian)(jian)(jian)(jian)不會直(zhi)接造成(cheng)影(ying)響試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)條(tiao)件(jian)(jian)(jian)(jian)中(zhong)(zhong)(zhong)斷(duan)(duan)(duan)(duan)處理(li)，如(ru)(ru)果以(yi)后試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)中(zhong)(zhong)(zhong)出(chu)現試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)樣品(pin)失效，則應認為此試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)結果無效。 在實際工作中(zhong)(zhong)(zhong)，我(wo)們(men)對(dui)因(yin)試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)樣品(pin)的(de)(de)(de)(de)故(gu)障(zhang)引起的(de)(de)(de)(de)試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)中(zhong)(zhong)(zhong)斷(duan)(duan)(duan)(duan)，采用(yong)待試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)樣品(pin)修復(fu)后重新試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)的(de)(de)(de)(de)方法；對(dui)于因(yin)試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)設備的(de)(de)(de)(de)原因(yin) ( 如(ru)(ru)突然(ran)停水、停電(dian)、設備故(gu)障(zhang)等 ) 而引起的(de)(de)(de)(de)試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)中(zhong)(zhong)(zhong)斷(duan)(duan)(duan)(duan)，如(ru)(ru)果中(zhong)(zhong)(zhong)斷(duan)(duan)(duan)(duan)時(shi)(shi)(shi)(shi)間不是(shi)很長 (2 小時(shi)(shi)(shi)(shi)以(yi)內(nei)(nei) ) ，我(wo)們(men)通常按照 GJB 150 中(zhong)(zhong)(zhong)規定(ding)(ding)的(de)(de)(de)(de)欠試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)條(tiao)件(jian)(jian)(jian)(jian)中(zhong)(zhong)(zhong)斷(duan)(duan)(duan)(duan)進行(xing)處理(li)，如(ru)(ru)果時(shi)(shi)(shi)(shi)間過(guo)長 , 這(zhe)項試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)必須重做(zuo)(zuo)。之所以(yi)這(zhe)樣應用(yong)試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)中(zhong)(zhong)(zhong)斷(duan)(duan)(duan)(duan)處理(li)的(de)(de)(de)(de)規定(ding)(ding)，是(shi)由試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)樣品(pin)溫(wen)度穩定(ding)(ding)的(de)(de)(de)(de)規定(ding)(ding)來決定(ding)(ding)的(de)(de)(de)(de)。 
     溫(wen)(wen)度(du)(du)(du)試(shi)驗(yan)中有關(guan)試(shi)驗(yan)溫(wen)(wen)度(du)(du)(du)下(xia)(xia)的(de)(de)持續時(shi)(shi)(shi)(shi)間(jian)(jian)(jian)的(de)(de)確(que)定(ding)常以試(shi)驗(yan)樣(yang)(yang)品(pin)(pin)(pin)(pin)(pin)在(zai)該溫(wen)(wen)度(du)(du)(du)下(xia)(xia)達(da)(da)(da)到(dao)溫(wen)(wen)度(du)(du)(du)穩(wen)(wen)(wen)(wen)(wen)定(ding)為(wei)準。由于(yu)(yu)產(chan)品(pin)(pin)(pin)(pin)(pin)結構(gou)和材料以及試(shi)驗(yan)設(she)備(bei)能力(li)的(de)(de)不(bu)同(tong)，不(bu)同(tong)產(chan)品(pin)(pin)(pin)(pin)(pin)在(zai)同(tong)一(yi)溫(wen)(wen)度(du)(du)(du)下(xia)(xia)達(da)(da)(da)到(dao)溫(wen)(wen)度(du)(du)(du)穩(wen)(wen)(wen)(wen)(wen)定(ding)的(de)(de)時(shi)(shi)(shi)(shi)間(jian)(jian)(jian)是(shi)(shi)不(bu)同(tong)的(de)(de)。當把試(shi)驗(yan)樣(yang)(yang)品(pin)(pin)(pin)(pin)(pin)的(de)(de)表(biao)面(mian)被(bei)加熱(re)(re)量(liang)(liang) ( 或冷(leng)卻(que) ) ，然(ran)后(hou)逐漸(jian)傳到(dao)試(shi)驗(yan)樣(yang)(yang)品(pin)(pin)(pin)(pin)(pin)內(nei)部。這(zhe)樣(yang)(yang)一(yi)個(ge)(ge)(ge)導熱(re)(re)過程(cheng)是(shi)(shi)一(yi)個(ge)(ge)(ge)穩(wen)(wen)(wen)(wen)(wen)定(ding)導熱(re)(re)過程(cheng)，試(shi)驗(yan)樣(yang)(yang)品(pin)(pin)(pin)(pin)(pin)內(nei)部溫(wen)(wen)度(du)(du)(du)達(da)(da)(da)到(dao)熱(re)(re)平衡(heng)要比試(shi)驗(yan)樣(yang)(yang)品(pin)(pin)(pin)(pin)(pin)表(biao)面(mian)達(da)(da)(da)到(dao)熱(re)(re)平衡(heng)的(de)(de)時(shi)(shi)(shi)(shi)間(jian)(jian)(jian)存在(zai)一(yi)個(ge)(ge)(ge)時(shi)(shi)(shi)(shi)滯(zhi)，這(zhe)個(ge)(ge)(ge)時(shi)(shi)(shi)(shi)滯(zhi)就(jiu)是(shi)(shi)溫(wen)(wen)度(du)(du)(du)穩(wen)(wen)(wen)(wen)(wen)定(ding)時(shi)(shi)(shi)(shi)間(jian)(jian)(jian)。對無(wu)法測(ce)量(liang)(liang)溫(wen)(wen)度(du)(du)(du)穩(wen)(wen)(wen)(wen)(wen)定(ding)的(de)(de)試(shi)驗(yan)樣(yang)(yang)品(pin)(pin)(pin)(pin)(pin)規定(ding)了(le)所需最短時(shi)(shi)(shi)(shi)間(jian)(jian)(jian)，即(ji)在(zai)不(bu)工(gong)作(zuo)狀(zhuang)態下(xia)(xia)，無(wu)法測(ce)量(liang)(liang)時(shi)(shi)(shi)(shi)，溫(wen)(wen)度(du)(du)(du)穩(wen)(wen)(wen)(wen)(wen)定(ding)最短時(shi)(shi)(shi)(shi)間(jian)(jian)(jian)為(wei) 3 小(xiao)時(shi)(shi)(shi)(shi)，在(zai)工(gong)作(zuo)狀(zhuang)態下(xia)(xia)，溫(wen)(wen)度(du)(du)(du)穩(wen)(wen)(wen)(wen)(wen)定(ding)最短時(shi)(shi)(shi)(shi)間(jian)(jian)(jian)為(wei) 2 小(xiao)時(shi)(shi)(shi)(shi)，在(zai)實際工(gong)作(zuo)中，我們就(jiu)以 2 小(xiao)時(shi)(shi)(shi)(shi)當作(zuo)溫(wen)(wen)度(du)(du)(du)穩(wen)(wen)(wen)(wen)(wen)定(ding)時(shi)(shi)(shi)(shi)間(jian)(jian)(jian)。當試(shi)驗(yan)樣(yang)(yang)品(pin)(pin)(pin)(pin)(pin)達(da)(da)(da)到(dao)溫(wen)(wen)度(du)(du)(du)穩(wen)(wen)(wen)(wen)(wen)定(ding)后(hou)，如果試(shi)驗(yan)樣(yang)(yang)品(pin)(pin)(pin)(pin)(pin)周圍溫(wen)(wen)度(du)(du)(du)突然(ran)變(bian)化時(shi)(shi)(shi)(shi)，處(chu)于(yu)(yu)熱(re)(re)平衡(heng)狀(zhuang)態下(xia)(xia)的(de)(de)試(shi)驗(yan)樣(yang)(yang)品(pin)(pin)(pin)(pin)(pin)也(ye)相應地存在(zai)一(yi)個(ge)(ge)(ge)時(shi)(shi)(shi)(shi)滯(zhi)，即(ji)在(zai)時(shi)(shi)(shi)(shi)間(jian)(jian)(jian)很短的(de)(de)情況下(xia)(xia)，試(shi)驗(yan)樣(yang)(yang)品(pin)(pin)(pin)(pin)(pin)內(nei)部的(de)(de)溫(wen)(wen)度(du)(du)(du)不(bu)至于(yu)(yu)有太大的(de)(de)變(bian)化。 
     在(zai)試(shi)(shi)驗(yan)(yan)(yan)過程中(zhong)，如(ru)果遇到突然(ran)停水、停電或試(shi)(shi)驗(yan)(yan)(yan)設(she)備(bei)故障的(de)(de)情況(kuang)，我(wo)們(men)首先應密(mi)閉試(shi)(shi)驗(yan)(yan)(yan)箱(xiang)門(men)，因為試(shi)(shi)驗(yan)(yan)(yan)設(she)備(bei)突然(ran)停止運行(xing)(xing)時，只要密(mi)閉箱(xiang)門(men)，試(shi)(shi)驗(yan)(yan)(yan)箱(xiang)門(men)的(de)(de)溫(wen)(wen)度(du)不會急劇(ju)地變化(hua)，在(zai)時間(jian)很短的(de)(de)情況(kuang)下，試(shi)(shi)驗(yan)(yan)(yan)樣品內(nei)部的(de)(de)溫(wen)(wen)度(du)也不會有太大的(de)(de)變化(hua)；然(ran)后，確(que)定(ding)這次(ci)中(zhong)斷(duan)(duan)是否對試(shi)(shi)驗(yan)(yan)(yan)樣品造(zao)成影(ying)響(xiang)，如(ru)果對試(shi)(shi)驗(yan)(yan)(yan)樣品沒有造(zao)成影(ying)響(xiang)，并且試(shi)(shi)驗(yan)(yan)(yan)設(she)備(bei)能(neng)夠在(zai)短時間(jian)內(nei)恢復正常工作，我(wo)們(men)就(jiu)可以(yi)按(an)照 GJB 150 所規定(ding)的(de)(de)欠(qian)試(shi)(shi)驗(yan)(yan)(yan)條(tiao)件中(zhong)斷(duan)(duan)的(de)(de)處理方(fang)法繼續進行(xing)(xing)試(shi)(shi)驗(yan)(yan)(yan)，除非試(shi)(shi)驗(yan)(yan)(yan)的(de)(de)中(zhong)斷(duan)(duan)對試(shi)(shi)驗(yan)(yan)(yan)樣品造(zao)成了一定(ding)的(de)(de)影(ying)響(xiang)。 

新型LED測試恒溫恒濕試驗箱

什(shen)么(me)是LED？
發(fa)(fa)光(guang)二(er)(er)極(ji)管(guan)(Light Emitting Diode，LED)，是(shi)一(yi)種特殊的(de)二(er)(er)極(ji)管(guan)，加正(zheng)向電壓時，發(fa)(fa)光(guang)二(er)(er)極(ji)管(guan)能(neng)發(fa)(fa)出單(dan)色、不連續的(de)光(guang)，這(zhe)是(shi)電致發(fa)(fa)光(guang)效應的(de)一(yi)種。改變所采(cai)用(yong)(yong)半(ban)導體(ti)材(cai)料的(de)化學組成(cheng)成(cheng)分，可(ke)(ke)使發(fa)(fa)光(guang)二(er)(er)極(ji)管(guan)發(fa)(fa)出在近紫外線(xian)、可(ke)(ke)見光(guang)或紅(hong)外線(xian)的(de)光(guang)。初時多用(yong)(yong)作(zuo)為(wei)指示燈、顯示板等；隨(sui)著白(bai)光(guang)LED的(de)出現，也被(bei)用(yong)(yong)作(zuo)照明。它被(bei)譽為(wei)21世紀的(de)新(xin)型光(guang)源，具有效率高，壽命長，不易破損等傳統光(guang)源無法與之比較(jiao)的(de)優點。
依亮(liang)度區分一般(ban)亮(liang)度:
1-傳(chuan)統LED(由GaP、GaAsP等材料(liao)構成)
2-高亮度(du)LED(由(you)AlGaAs材料構成(cheng))
3-超高(gao)亮(liang)度LED等材(cai)料構(gou)成(cheng)。
☆.紅(hong)(hong)外線二極管IRED:不同于發(fa)射(she)之紅(hong)(hong)外線為不可見光，不同之應(ying)用。
 
LED可靠度試驗(yan)說明：
LED最初(chu)的開發是在(zai)1960年(nian)代(dai)，當時是運(yun)用在(zai)交通號志或是民生用品上，直到近(jin)年(nian)才運(yun)用在(zai)照(zhao)明以及當作替(ti)代(dai)燈源。
 
LED壽(shou)命(ming)補充資料：
1.LED的節溫(Junction Temp.)越(yue)低LED的壽命越(yue)久，相(xiang)對的節溫越(yue)高壽命越(yue)短
2.LED在高溫下的壽命74℃10000小(xiao)時、63℃25000小(xiao)時
3.LED光源屬于(yu)工業(ye)產品，所(suo)以(yi)需要(yao)擁有35000小(xiao)時的壽(shou)命(ming)(保證使用時間(jian))
4.一般(ban)電燈燈源壽命(ming)約(yue)1000小時(shi)
5. 6.LED路(lu)燈壽命(ming)需求50000小時以上
 
 
LED試驗條件整理：
溫(wen)度沖擊：
沖(chong)(chong)擊溫度1 室(shi)溫 沖(chong)(chong)擊溫度2 負歸時間 cycle 沖(chong)(chong)擊方式 備(bei)注
-20 ℃(5min) 2min 90℃(5min) 2 氣體(ti)式沖擊  
-30 ℃(5min) 5min 105 ℃(5min) 10 氣體式沖擊  
-30℃(30min) 105℃(30min) 10 氣體式(shi)沖擊  
88℃(20min) -44℃(20min) 10 氣體式沖(chong)擊  
100℃(30min) -40℃(30min) 30 氣體式沖擊  
100℃(15min) -40℃(15min) 5min 300 氣體式沖(chong)擊 高亮度(du)LED
100℃(5min) -10℃(5min) 300 液體式(shi)沖(chong)擊 高亮度(du)LED
   
LED高(gao)溫高(gao)濕：
溫濕度條件 時間 備注：  
40℃/95%R.H. 96小時  
60℃/85%R.H. 500小時(shi) 壽(shou)命試驗  
60℃/90%R.H. 1000小時 壽命試驗(yan)  
60℃/95%R.H. 500小時 壽命試驗  
85℃/85%R.H. 50小(xiao)時(shi)  
85℃/85%R.H. 1000小時 壽(shou)命試(shi)驗(yan)
   
室溫(wen)壽命試驗(yan)：
27℃ 1000小(xiao)時(shi) 加(jia)電流連(lian)續點亮(liang)  
   
高溫壽命試(shi)驗：
85℃ 1000小(xiao)時 加(jia)電(dian)流連(lian)續點亮(liang)   
100℃ 1000小(xiao)時 加電流連續點亮(liang)  
   
低溫壽命試驗：
-40℃ 1000小時(shi) 加電流連續(xu)點亮  
-45℃ 1000小時(shi) 加電流連續點(dian)亮  
 
沾錫性試驗：
試驗(yan)條件： 備注(zhu)：
LED之腳(離膠體(ti)底部1.6mm)浸入260℃錫槽中5秒  
LED之腳(離膠體(ti)底部1.6mm)浸入(ru)260+5℃錫槽中6秒  
LED之腳(離(li)膠體底部1.6mm)浸(jin)入(ru)300℃錫槽中(zhong)3秒(miao)  
   
回焊爐試(shi)驗：
240℃ 10秒  
 
環境試驗（在(zai)260℃±5℃溫度下進行TTW焊料(liao)處理10秒）
試(shi)(shi)驗(yan)名稱 參(can)(can)考(kao)標準 參(can)(can)考(kao)JIS C 7021試(shi)(shi)驗(yan)條件內容  
  測試溫度/駐留(liu)時間 復歸 循環數(H)
溫度沖擊 MIL-STD-883方法1010 -55℃←→100℃，15分(fen)鐘駐留，空(kong)氣-空(kong)氣貯存。 5分(fen)鐘 50/100/1000
溫(wen)度(du)沖擊 MIL-STD-883方法1010 -40℃←→100℃，15分(fen)鐘駐留，空(kong)氣-空(kong)氣貯存。 5分(fen)鐘 5/65/100/200
溫度沖擊 MIL-STD-883方(fang)法1010 -40℃←→100℃，15分鐘駐留，＜10秒轉換(huan)，空(kong)氣-空(kong)氣貯存(cun)。 15分鐘 5/50/100
功率溫度循環(huan) 汽車規范 -40℃←→85℃，18分鐘(zhong)駐留，42分鐘(zhong)轉換，加(jia)電流(liu)，5分鐘(zhong)通/斷 100/500
功(gong)率溫(wen)度循環 汽車規范 -40℃←→85℃，15分鐘停機/轉換，加電流，5分鐘通/斷,  駐(zhu)留500h,100h 100
功率溫(wen)度循環(huan) -40℃←→105℃，15分(fen)鐘停機/轉換，加電(dian)流，5分(fen)鐘通/斷，168h  
溫(wen)度循環 85℃/85%R.H，加電流，500H/1000H  
溫度(du)循環 60℃/95%R.H，加電流 , 24h/168h/1000h  
高溫儲(chu)存 JIS C 7021方法B-10 110℃，500H/1000H  
環境試驗(yan)（在(zai)240℃±5℃溫度下(xia)進行(xing)TTW焊料(liao)處理10秒）
試(shi)驗名稱(cheng) 參(can)考(kao)標準 參(can)考(kao)JIS C 7021試(shi)驗條件(jian)內(nei)容(rong)  
  測試溫度/駐留(liu)時間 復(fu)歸 循(xun)環數(H)
溫度循環(huan) 汽車規范(fan) -40℃←→100℃，15分鐘駐留(liu) 5分鐘 5/50/100/1000
溫(wen)度循環 60℃/95％R.H，加電(dian)流 50/1000
濕(shi)度反(fan)向(xiang)偏壓 MIL-STD-883方法1010 60℃/95％R.H，5V RB