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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:草莓視頻下載app黃:深圳市澤創偉業科技有限公司
如何觀看工控主板(ban)的做工質量?下面一起來(lai)學習下吧(ba)。
一、布線設計
工(gong)(gong)(gong)控(kong)(kong)主(zhu)板(ban)上(shang)(shang)的(de)(de)(de)(de)布(bu)(bu)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)設計是一(yi)(yi)門比較專業(ye)的(de)(de)(de)(de)學問,它要(yao)視不(bu)(bu)同(tong)(tong)的(de)(de)(de)(de)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)路(lu)特(te)性進(jin)行不(bu)(bu)同(tong)(tong)的(de)(de)(de)(de)設計處(chu)理方(fang)式。工(gong)(gong)(gong)控(kong)(kong)主(zhu)板(ban)上(shang)(shang)采(cai)用的(de)(de)(de)(de)"蛇(she)(she)(she)(she)行布(bu)(bu)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)"就很(hen)有講究,有些人(ren)認為(wei)(wei)(wei)蛇(she)(she)(she)(she)行布(bu)(bu)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)越多(duo)(duo)就說(shuo)明有更高(gao)(gao)的(de)(de)(de)(de)設計水平(ping)(ping),這(zhe)種(zhong)觀點是錯誤的(de)(de)(de)(de)。采(cai)用蛇(she)(she)(she)(she)行布(bu)(bu)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)的(de)(de)(de)(de)原因(yin)有兩個(ge):一(yi)(yi)個(ge)是為(wei)(wei)(wei)了保證布(bu)(bu)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)路(lu)的(de)(de)(de)(de)等長(chang),因(yin)為(wei)(wei)(wei)像CPU到北(bei)橋芯片的(de)(de)(de)(de)時(shi)鐘(zhong)線(xian)(xian)(xian)(xian)(xian)(xian)(xian),它不(bu)(bu)同(tong)(tong)于普通(tong)(tong)電(dian)器(qi)上(shang)(shang)的(de)(de)(de)(de)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)路(lu),在這(zhe)些線(xian)(xian)(xian)(xian)(xian)(xian)(xian)路(lu)上(shang)(shang)以(yi)(yi)100MHz左右的(de)(de)(de)(de)頻(pin)率(lv)高(gao)(gao)速(su)運行的(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)對(dui)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)路(lu)的(de)(de)(de)(de)長(chang)度十分(fen)(fen)的(de)(de)(de)(de)敏感,不(bu)(bu)等長(chang)的(de)(de)(de)(de)時(shi)鐘(zhong)布(bu)(bu)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)路(lu)會(hui)(hui)引起信(xin)(xin)(xin)號(hao)的(de)(de)(de)(de)不(bu)(bu)同(tong)(tong)步進(jin)而造(zao)成(cheng)系統不(bu)(bu)穩(wen),這(zhe)樣某些線(xian)(xian)(xian)(xian)(xian)(xian)(xian)路(lu)需要(yao)以(yi)(yi)彎(wan)曲的(de)(de)(de)(de)方(fang)式走線(xian)(xian)(xian)(xian)(xian)(xian)(xian),以(yi)(yi)調節長(chang)度;另(ling)一(yi)(yi)個(ge)使用蛇(she)(she)(she)(she)行布(bu)(bu)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)的(de)(de)(de)(de)常(chang)見原因(yin)是為(wei)(wei)(wei)了盡(jin)可(ke)能減少電(dian)磁(ci)輻射(she)(EMI)對(dui)主(zhu)板(ban)其(qi)余(yu)部件和人(ren)體的(de)(de)(de)(de)影響,因(yin)為(wei)(wei)(wei)高(gao)(gao)速(su)而單調的(de)(de)(de)(de)數字信(xin)(xin)(xin)號(hao)會(hui)(hui)大大地干(gan)擾主(zhu)板(ban)上(shang)(shang)模擬(ni)器(qi)件的(de)(de)(de)(de)工(gong)(gong)(gong)作,如(ru)AC''97芯片或板(ban)載的(de)(de)(de)(de)軟貓等。平(ping)(ping)常(chang)抑(yi)制EMI的(de)(de)(de)(de)一(yi)(yi)種(zhong)簡便方(fang)法就是通(tong)(tong)過設計蛇(she)(she)(she)(she)形(xing)布(bu)(bu)線(xian)(xian)(xian)(xian)(xian)(xian)(xian),來盡(jin)可(ke)能多(duo)(duo)吸(xi)收消化輻射(she)。采(cai)用蛇(she)(she)(she)(she)行布(bu)(bu)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)有了上(shang)(shang)面這(zhe)些好處(chu),并(bing)不(bu)(bu)是說(shuo)在工(gong)(gong)(gong)控(kong)(kong)主(zhu)板(ban)布(bu)(bu)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)設計的(de)(de)(de)(de)時(shi)候(hou)使用蛇(she)(she)(she)(she)行布(bu)(bu)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)越多(duo)(duo)越好,因(yin)為(wei)(wei)(wei)過多(duo)(duo)過密的(de)(de)(de)(de)主(zhu)板(ban)布(bu)(bu)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)會(hui)(hui)造(zao)成(cheng)工(gong)(gong)(gong)控(kong)(kong)主(zhu)板(ban)布(bu)(bu)局的(de)(de)(de)(de)疏密不(bu)(bu)均(jun),會(hui)(hui)對(dui)工(gong)(gong)(gong)控(kong)(kong)主(zhu)板(ban)的(de)(de)(de)(de)質量有一(yi)(yi)定(ding)的(de)(de)(de)(de)影響。好的(de)(de)(de)(de)布(bu)(bu)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)應(ying)使工(gong)(gong)(gong)控(kong)(kong)主(zhu)板(ban)上(shang)(shang)各(ge)部分(fen)(fen)線(xian)(xian)(xian)(xian)(xian)(xian)(xian)路(lu)密度差(cha)別(bie)不(bu)(bu)大,并(bing)且要(yao)盡(jin)可(ke)能均(jun)勻分(fen)(fen)布(bu)(bu)否(fou)則很(hen)容(rong)易造(zao)成(cheng)工(gong)(gong)(gong)控(kong)(kong)主(zhu)板(ban)的(de)(de)(de)(de)不(bu)(bu)穩(wen)定(ding)。
二、做(zuo)工(gong)用(yong)料
1、PCB(印刷電路板)的做工
質量(liang)有保證的PC板(ban)色彩基本保持一致(zhi),光潔度好,看(kan)起來油光發亮的一般(ban)質量(liang)就比(bi)較(jiao)好。PCB板(ban)層數一般(ban)的標準(zhun)是4、6層板(ban),當(dang)然6層板(ban)質量(liang)要好很多。
2、SMT(表面貼裝)元器(qi)件的做工
主要通過觀察(cha)某(mou)些元器(qi)件貼裝精(jing)度(du)來(lai)判定(ding)主板的生產工藝是否精(jing)良,標準的元器(qi)件貼裝定(ding)位準確,沒有偏移(yi)。
3、工控主板(ban)用料
名牌大廠所生(sheng)產(chan)的工(gong)控主(zhu)(zhu)板(ban)用(yong)料(liao),像CPU插座、擴展槽和插槽等都采(cai)用(yong)名廠的插接界面元器(qi)件,主(zhu)(zhu)板(ban)的性能也(ye)就不用(yong)多說了。