傳感器 800T-J42KT7ECXX
工業(yè)電路板維修技巧
不能過分依賴在線測試儀
1.功能測試不能代替參數(shù)測試
2. 功能測試僅能測試到器件的截止區(qū)，放大區(qū)和飽和區(qū)，但無法了解此時(shí)的工作頻率的高低和速度的快慢。
3. 對數(shù)字芯片而言，僅知道有高低電平的輸出變化，但無法查出它的上升和下降沿的變化速度。
4. 對于模擬芯片，它處理的是模擬的變化量。其受電路的元器件的分布，解決信號(hào)方案的不同的影響，是錯(cuò)綜復(fù)雜的。就目前的在線測試技術(shù)，要解決模擬芯片在線測試是不可能的。所以，這項(xiàng)功能測試的結(jié)果，僅能供參考。
5. 大多數(shù)的在線測試議，在對于電路板上的各類芯片進(jìn)行功能測試后，均會(huì)給出“測試通過”或“測試不通過”。那么它為什么不給出被測器件是否有問題呢？這就是這類測試儀的缺撼。因?yàn)樵诰€測試時(shí)，所受影響（干擾）的因素太多。要求在測試前采取不少的措施（如斷開晶振，去掉CPU和帶程序的芯片，加隔離中斷信號(hào)等等），這樣做是否均有效，值得研究。至少，目前的測試結(jié)果有時(shí)不盡人意。
6. 了解在線測試儀的讀者，均知道有這么一句行話。“在線測試時(shí)不通過的芯片不一定是損壞的；測試通過的芯片一定是沒有損壞的。”它的解釋為，如器件受在線影響或抗干擾時(shí)，結(jié)果可能不通過，對此不難理解。那么，是否損壞的芯片在進(jìn)行測試時(shí)，均會(huì)得出“不通過”呢？回答確實(shí)不能肯定。筆者與同行均遇到過，明明芯片已損壞了（確切地說換上這個(gè)芯片板子就不工作了），但測試結(jié)果是通過的。權(quán)威解釋為這是測試儀自身工作原理（后驅(qū)動(dòng)技術(shù)）所致。故此我們不能過分依賴在線測試儀（盡管各廠家宣傳的很玄）的作用，否則將使維修電路板的工作誤入歧途。
傳感器 800T-J42KT7ECXX
| 800T-J4217B |
| 800T-J4233 |
| 800T-J4234 |
| 800T-J42A |
| 800T-J42B |
| 800T-J42C |
| 800T-J42KA1AJXX |
| 800T-J42KB7ABXX |
| 800T-J42KB7ADXX |
| 800T-J42KB7AEGX |
| 800T-J42KB7AGGX |
| 800T-J42KB7BBXX |
| 800T-J42KB7JCXX |
| 800T-J42KC1 |
| 800T-J42KC1AAXE |
| 800T-J42KC1ACNM |
| 800T-J42KC1AGXX |
| 800T-J42KC1ANAX |
| 800T-J42KC1B |
| 800T-J42KC1EAXX |
| 800T-J42KC1NAXA |
| 800T-J42KC7AAMN |
| 800T-J42KC7ADNX |
| 800T-J42KC7AEJX |
| 800T-J42KD7 |
| 800T-J42KD7AAKK |
| 800T-J42KE7 |
| 800T-J42KE7AAMM |
| 800T-J42KE7AAXA |
| 800T-J42KE7BBNA |
| 800T-J42KE7LLXX |
| 800T-J42KH4AGXG |
| 800T-J42KH4DGXG |
| 800T-J42KH4EGXX |
| 800T-J42KT7 |
| 800T-J42KT7ECXX |
| 800T-J42KU7 |
| 800T-J42KU7B |
| 800T-J43 |
| 800T-J4304KD7 |
| 800T-J4315KC1FUXX |
| 800T-J43A |
| 800T-J43CY |
| 800T-J43KA1 |
| 800T-J43KA7 |
| 800T-J43KC176XX |
| 800T-J43KC1AEXX |
| 800T-J43KC1AGXG |
| 800T-J43KC1BAXX |
| 800T-J43KC7AEXX |
| 800T-J43KD7 |
| 800T-J43KE7 |
| 800T-J43KH4EGXX |
| 800T-J43KH4NGXG |
| 800T-J43KU7 |
| 800T-J44 |
| 800T-J4403 |
| 800T-J4403A |
| 800T-J4403BY |
| 800T-J4403KC1EAXX |
| 800T-J4403KD7 |
| 800T-J4403KE7 |
| 800T-J4403KU7 |
| 800T-J4404KB7ADXX |
| 800T-J4404KD7 |
| 800T-J4404KD7B |
| 800T-J4404KE7 |
| 800T-J4405KC1AEXX |
| 800T-J4405KC1B |
| 800T-J4405KC7AABD |
| 800T-J4405KD7 |
| 800T-J4405KE7 |
| 800T-J4406BV |
| 800T-J4406KC1AEXX |
| 800T-J4406KD7B |
| 800T-J4406KE7 |
| 800T-J4406KU7 |
| 800T-J4407B |
| 800T-J4408KD7 |
| 800T-J4411KC1B |
| 800T-J4412 |
| 800T-J4412KE7 |
| 800T-J4414KB7DGXX |
| 800T-J4414KE7 |
| 800T-J4415 |
| 800T-J4415KC1B |
| 800T-J4418A |
| 800T-J4426 |
| 800T-J44A |
| 800T-J44B |
| 800T-J44BV |
| 800T-J44C |
| 800T-J44KA1BBXX |
| 800T-J44KA1CCMM |
| 800T-J44KA7A |
| 800T-J44KA7AAAN |
| 800T-J44KA7B |
| 800T-J44KB7AAAM |
| 800T-J44KB7AAJG |
| PLC-BSP-230UC/21/SO46 |
| PLC-RSC-24DC/21 |
| PLC-RSC-24DC/21-21 |
| PLC-RSC-24DC/1/ACT |
| PLC-RSC-24DC/1-1/ACT |
| PLC-RSC-24DC/21HC |
| PLC-RSC-230UC/21 |
| PLC-BSC-230UC/21HC |
| PLC-BSC-230UC/21/SO46 |
| REL-MR-60DC/21 |
| PLC-BSC-230UC/21-21/SO46 |
| PLC-RSC-24UC/21 |
| REL-MR-110DC/21-21 |
| PLC-ESKGY |
| PLC-RSP-24DC/21AU |
| PLC-OSP-24DC/24DC/2 |
| FBST500-PLCBN |
| PLC-ATPBK |
| MACX MCR-EX-SL-RPSSI-I |
| MACX MCR-SL-CAC-5-I |
| MACX MCR-SL-CAC-5-I-UP |
| STEP-PS-100-240AC/12DC/3 |
| QUINT-PS-100-240AC/24DC/20 |
| QUINT-PS-100-240AC/24DC/2.5 |
| QUINT-PS-100-240AC/24DC/5 |
| QUINT-PS-3X400-500AC/24DC/5 |
| QUINT-PS-3X400-240AC/24DC/10 |
| QUINT-PS-100-240AC/24DC/10 |
| QUINT-PS-3X400-500AC/24DC/10 |
| QUINT-PS-3X400-240AC/24DC/20 |
| QUINT-PS-3X400-500AC/24DC/20 |
| QUINT-PS-3X400-500AC/24DC/30 |
| QUINT-PS-3X400-500AC/24DC/40 |
| QUINT-PS-100-240AC/48DC/5 |
| QUINT-PS-100-240AC/24DC/40 |
| QUINT-PS-100-240AC/12DC/10 |
| QUINT-PS-100-240AC/24DC/5/EX |
| QUINT-PS-100-240AC/24DC/10/EX |
| QUINT-DC-UPS/24DC/10 |
| MINIPS-100-240AC/24DC/1 |
| MINIPS-100-240AC/10-15DC/2 |
| STEP-PS-100-240AC/24DC/1.5 |
| FLSWITCH4TX/FX |
| FLSWITCH8TX |
| FLSWITCHMMHS |
| FLSWITCHSF14TX/2FX |
| FLSWITCHMCS16TX |
| FLSWITCHMCS14TX/2FX |
| FLSWITCHSF8TX |
| FLSWITCHSF6TX/2FX |
| FLSWITCHSFN5TX |
| FLSWITCHSFN4TX/FX |
| FLSWITCHSFN6TX/2FX |
| ETR-U-18-230UC/21 |
| MCR-C-UI-UI-450-DCI |
| MCR-CLP-UI-I-4 |
| MCR-VDC-UI-B-DC |
| MCR-C-UI-UI-DCI |
| MCR-C-UI-UI-DCI-NC |
| MCR-FL-C-UI-2UI-DCI |
| MCR-FL-C-UI-2UI-DCI-NC |
| MCR-C-U-U-DC |
| MCR-C-U-I-0-DC |
| MCR-C-I-U-0-DC |
| MCR-C-I-I-00-DC |
| MCR-C-I-U-4-DC |
| MCR-C-I-I-40-DC |
| MCR-C-U-I-4-DC |
| MCR-C-I-I-04-DC |
| MCR-1CLP-I-I-00 |
| MCR-2CLP-I-I-00 |
| MCR-CPS-I-I-44-E |
| MCR-SL-S-1-5-I-DCI-24 |
| MCR-T-UI-E-NC |
| MCR-PT100-I-DC |
