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如何觀看工控主板的做工質量?
2017-07-26 06:57:11 新聞來源:草莓視頻污片app:深圳市澤創偉業科技有限公司
如何(he)觀看工(gong)控主(zhu)板的做工(gong)質(zhi)量?下(xia)面一起來學習下(xia)吧(ba)。
一、布線設(she)計
工(gong)控主(zhu)(zhu)(zhu)板(ban)上(shang)的(de)(de)(de)布(bu)(bu)(bu)(bu)線(xian)(xian)(xian)(xian)(xian)(xian)設(she)計(ji)(ji)(ji)(ji)是(shi)(shi)一(yi)(yi)門比較專(zhuan)業的(de)(de)(de)學問,它(ta)要(yao)視不(bu)(bu)同(tong)的(de)(de)(de)線(xian)(xian)(xian)(xian)(xian)(xian)路(lu)特性進(jin)行(xing)不(bu)(bu)同(tong)的(de)(de)(de)設(she)計(ji)(ji)(ji)(ji)處理(li)方(fang)(fang)式(shi)。工(gong)控主(zhu)(zhu)(zhu)板(ban)上(shang)采(cai)用(yong)的(de)(de)(de)"蛇(she)行(xing)布(bu)(bu)(bu)(bu)線(xian)(xian)(xian)(xian)(xian)(xian)"就(jiu)很(hen)有(you)講究(jiu),有(you)些人認為(wei)蛇(she)行(xing)布(bu)(bu)(bu)(bu)線(xian)(xian)(xian)(xian)(xian)(xian)越多(duo)就(jiu)說(shuo)明(ming)有(you)更高(gao)的(de)(de)(de)設(she)計(ji)(ji)(ji)(ji)水平(ping),這(zhe)(zhe)種觀點是(shi)(shi)錯誤的(de)(de)(de)。采(cai)用(yong)蛇(she)行(xing)布(bu)(bu)(bu)(bu)線(xian)(xian)(xian)(xian)(xian)(xian)的(de)(de)(de)原(yuan)因(yin)有(you)兩個:一(yi)(yi)個是(shi)(shi)為(wei)了(le)保(bao)證布(bu)(bu)(bu)(bu)線(xian)(xian)(xian)(xian)(xian)(xian)線(xian)(xian)(xian)(xian)(xian)(xian)路(lu)的(de)(de)(de)等長,因(yin)為(wei)像CPU到北橋芯(xin)片(pian)的(de)(de)(de)時(shi)鐘線(xian)(xian)(xian)(xian)(xian)(xian),它(ta)不(bu)(bu)同(tong)于普通(tong)電(dian)(dian)器上(shang)的(de)(de)(de)線(xian)(xian)(xian)(xian)(xian)(xian)路(lu),在這(zhe)(zhe)些線(xian)(xian)(xian)(xian)(xian)(xian)路(lu)上(shang)以(yi)100MHz左(zuo)右的(de)(de)(de)頻(pin)率高(gao)速運行(xing)的(de)(de)(de)信號對(dui)線(xian)(xian)(xian)(xian)(xian)(xian)路(lu)的(de)(de)(de)長度(du)(du)十分的(de)(de)(de)敏感,不(bu)(bu)等長的(de)(de)(de)時(shi)鐘布(bu)(bu)(bu)(bu)線(xian)(xian)(xian)(xian)(xian)(xian)路(lu)會引起信號的(de)(de)(de)不(bu)(bu)同(tong)步(bu)進(jin)而(er)造成(cheng)系統不(bu)(bu)穩,這(zhe)(zhe)樣某些線(xian)(xian)(xian)(xian)(xian)(xian)路(lu)需要(yao)以(yi)彎曲的(de)(de)(de)方(fang)(fang)式(shi)走線(xian)(xian)(xian)(xian)(xian)(xian),以(yi)調(diao)節長度(du)(du);另(ling)一(yi)(yi)個使(shi)用(yong)蛇(she)行(xing)布(bu)(bu)(bu)(bu)線(xian)(xian)(xian)(xian)(xian)(xian)的(de)(de)(de)常見原(yuan)因(yin)是(shi)(shi)為(wei)了(le)盡(jin)可能(neng)減少電(dian)(dian)磁輻(fu)射(she)(EMI)對(dui)主(zhu)(zhu)(zhu)板(ban)其余部件和人體(ti)的(de)(de)(de)影響,因(yin)為(wei)高(gao)速而(er)單(dan)調(diao)的(de)(de)(de)數字信號會大大地干擾(rao)主(zhu)(zhu)(zhu)板(ban)上(shang)模擬器件的(de)(de)(de)工(gong)作(zuo),如AC''97芯(xin)片(pian)或板(ban)載的(de)(de)(de)軟貓等。平(ping)常抑(yi)制(zhi)EMI的(de)(de)(de)一(yi)(yi)種簡便(bian)方(fang)(fang)法就(jiu)是(shi)(shi)通(tong)過設(she)計(ji)(ji)(ji)(ji)蛇(she)形布(bu)(bu)(bu)(bu)線(xian)(xian)(xian)(xian)(xian)(xian),來盡(jin)可能(neng)多(duo)吸收消化(hua)輻(fu)射(she)。采(cai)用(yong)蛇(she)行(xing)布(bu)(bu)(bu)(bu)線(xian)(xian)(xian)(xian)(xian)(xian)有(you)了(le)上(shang)面這(zhe)(zhe)些好處,并不(bu)(bu)是(shi)(shi)說(shuo)在工(gong)控主(zhu)(zhu)(zhu)板(ban)布(bu)(bu)(bu)(bu)線(xian)(xian)(xian)(xian)(xian)(xian)設(she)計(ji)(ji)(ji)(ji)的(de)(de)(de)時(shi)候(hou)使(shi)用(yong)蛇(she)行(xing)布(bu)(bu)(bu)(bu)線(xian)(xian)(xian)(xian)(xian)(xian)越多(duo)越好,因(yin)為(wei)過多(duo)過密的(de)(de)(de)主(zhu)(zhu)(zhu)板(ban)布(bu)(bu)(bu)(bu)線(xian)(xian)(xian)(xian)(xian)(xian)會造成(cheng)工(gong)控主(zhu)(zhu)(zhu)板(ban)布(bu)(bu)(bu)(bu)局的(de)(de)(de)疏密不(bu)(bu)均,會對(dui)工(gong)控主(zhu)(zhu)(zhu)板(ban)的(de)(de)(de)質量有(you)一(yi)(yi)定的(de)(de)(de)影響。好的(de)(de)(de)布(bu)(bu)(bu)(bu)線(xian)(xian)(xian)(xian)(xian)(xian)應使(shi)工(gong)控主(zhu)(zhu)(zhu)板(ban)上(shang)各(ge)部分線(xian)(xian)(xian)(xian)(xian)(xian)路(lu)密度(du)(du)差(cha)別不(bu)(bu)大,并且要(yao)盡(jin)可能(neng)均勻(yun)分布(bu)(bu)(bu)(bu)否則很(hen)容易造成(cheng)工(gong)控主(zhu)(zhu)(zhu)板(ban)的(de)(de)(de)不(bu)(bu)穩定。
二、做工用料(liao)
1、PCB(印刷電路板(ban))的做(zuo)工
質量有保證的PC板(ban)色彩基本保持一致,光(guang)潔(jie)度好,看起來(lai)油光(guang)發亮的一般質量就比較好。PCB板(ban)層數一般的標準是4、6層板(ban),當然6層板(ban)質量要(yao)好很多。
2、SMT(表(biao)面貼裝)元器件的(de)做工
主要(yao)通過(guo)觀察某些(xie)元(yuan)器件(jian)貼(tie)裝(zhuang)精(jing)度來判定主板的(de)生(sheng)產工藝是(shi)否精(jing)良,標(biao)準(zhun)的(de)元(yuan)器件(jian)貼(tie)裝(zhuang)定位(wei)準(zhun)確(que),沒(mei)有偏移。
3、工控主板用料
名牌大廠(chang)所生產的工控主(zhu)板用(yong)料,像CPU插座、擴展槽和插槽等都采用(yong)名廠(chang)的插接界(jie)面元器件,主(zhu)板的性能也就不(bu)用(yong)多說了(le)。