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IC694ACC311     端子
IC694ACC311 端子
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      IC694ACC311     端子  


        在無任何原理圖狀況下要對一塊比較陌生的電路板進(jìn)行維修,以往的所謂“經(jīng)驗”就難有作為,盡管硬件功底深厚的人對維修充滿信心,但如果方法不當(dāng),工作起來照樣事倍功半。那么,怎樣做才能提高維修效呢?根據(jù)我公司進(jìn)口設(shè)備維修中心統(tǒng)計出來的資料,應(yīng)遵循以下幾個步驟、按順序有條不紊的進(jìn)行。 
      方法一:先看后量 
      使用工具:萬用表、放大鏡 
      當(dāng)手拿一塊待修的電路板,良好的習(xí)慣首先是應(yīng)對其進(jìn)行目測,必要時還要借助放大鏡,看什么呢? 
      主要看: 
      1、是否有斷線; 
      2、分力元件如電阻、電解電容、電感、二極管、三極管等時候存在斷開現(xiàn)象; 
      3、電路板上的印制板連接線是否存在斷裂、粘連等; 
      4、是否有人修過?動過哪些元器件?是否存在虛焊、漏焊、插反等操作方面的失誤; 
      在確定了被修無上述狀況后,首先用萬用表測量電路板電源和地之間的阻值,通常電路板的阻值都在70-80?以上,若阻值太小,才幾個或十幾個歐姆,說明電路板上有元器件被擊穿或部分擊穿,就必須采取措施將被擊穿的元器件找出來。具體辦法是給被修板供電,用手去摸電路板上各器件的 
      溫度,燙手的講師重點懷疑對象。若阻值正常,用萬用表測量板上的阻、二極管、三極管、場效應(yīng)管、撥段開關(guān)等分力元件,其目的就是首先要確保測量過的元件是正常的,我們的理由是,能用萬用表解決的問題,就不要把它復(fù)雜化。 
       



      碳達(dá)峰、碳中和”是中國發(fā)展的重大戰(zhàn)略決策,而工業(yè)園區(qū)在其中扮演著極為重要的落地角色。此次白皮書的發(fā)布,可以為中國園區(qū)在綠色低碳發(fā)展方面提供可參照的衡量指標(biāo)和寶貴經(jīng)驗。未來,我們期待能有更多的園區(qū)參與到綠色低碳發(fā)展中來。該白皮書將持續(xù)更新,根據(jù)更多園區(qū)綠色低碳發(fā)展的狀態(tài)和進(jìn)步來完善評估體系,繼續(xù)識別和鼓勵在此方面有突出成就的園區(qū),共同助力中國實現(xiàn)‘雙碳’目標(biāo)。

        西門子艾聞達(dá)中國區(qū)總經(jīng)理

        西門子中國研究院院長

        朱驍洵

        在全球應(yīng)對氣候危機(jī)的背景下,園區(qū)作為中國產(chǎn)業(yè)和經(jīng)濟(jì)發(fā)展的重要承載形式,在提供了大量基礎(chǔ)設(shè)施和公共服務(wù)的同時,也是主要的碳排放源頭之一。因此,科學(xué)評估園區(qū)的低碳發(fā)展水平成為了“雙碳”戰(zhàn)略下一個重要話題。此次發(fā)布的白皮書建立并使用了中國園區(qū)低碳發(fā)展進(jìn)程評估框架(PDI),從表現(xiàn)力、發(fā)展力和影響力三大緯度對32家園區(qū)的低碳發(fā)展進(jìn)程和成效進(jìn)行了全方位的調(diào)研和評估。通過調(diào)研可以發(fā)現(xiàn),園區(qū)在低碳發(fā)展上普遍面臨難以精準(zhǔn)科學(xué)降碳、驅(qū)動力不足、缺乏整體政策和創(chuàng)新抓手、對綠色金融創(chuàng)新工具的應(yīng)用缺乏等挑戰(zhàn)。



      IC694ACC311     端子  

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