供應(yīng)ABB 3HAC023566-001 電機(jī)
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(duì)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(duì)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(duì)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！彼慕忉尀椋缙骷茉诰影響或抗干擾時(shí)，結(jié)果可能不通過，對(duì)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。
供應(yīng)ABB 3HAC023566-001 電機(jī)
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供應(yīng)ABB 3HAC023566-001 電機(jī)
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供應(yīng)ABB 3HAC023566-001 電機(jī)
從產(chǎn)品本身來說，第七代高壓變頻器在產(chǎn)品設(shè)計(jì)上有極大的提升，無論是縱向與前代產(chǎn)品相比或者橫向與市場同類產(chǎn)品比較，新產(chǎn)品的優(yōu)勢(shì)都足夠大，能給客戶帶來良好的價(jià)值收益。利德華福市場部總監(jiān)金石將其總結(jié)為“四新”、“三高”、“兩低”三個(gè)層面。
“四新”是指新的核心器件、新的電氣技術(shù)、新的結(jié)構(gòu)設(shè)計(jì)及新的數(shù)字化服務(wù)；“三高”是高可靠性、高功率密度，和高質(zhì)量服務(wù)，而“兩低”則是客戶全生命周期的成本低，以及低碳。
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