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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:黃瓜視頻APP在線下載:深圳市澤創偉業科技有限公司
如何觀看(kan)工控主板(ban)的做工質量?下(xia)面一起來(lai)學(xue)習下(xia)吧。
一、布線設計
工(gong)(gong)(gong)控主板(ban)(ban)上的(de)(de)(de)(de)(de)(de)(de)布(bu)(bu)線(xian)(xian)(xian)設(she)計是(shi)(shi)一(yi)門比較專業的(de)(de)(de)(de)(de)(de)(de)學問,它(ta)要(yao)視不(bu)(bu)(bu)同(tong)(tong)的(de)(de)(de)(de)(de)(de)(de)線(xian)(xian)(xian)路(lu)(lu)(lu)特性進(jin)行(xing)(xing)(xing)不(bu)(bu)(bu)同(tong)(tong)的(de)(de)(de)(de)(de)(de)(de)設(she)計處理方式(shi)。工(gong)(gong)(gong)控主板(ban)(ban)上采用(yong)的(de)(de)(de)(de)(de)(de)(de)"蛇(she)(she)行(xing)(xing)(xing)布(bu)(bu)線(xian)(xian)(xian)"就(jiu)(jiu)(jiu)很(hen)有講究,有些人認為蛇(she)(she)行(xing)(xing)(xing)布(bu)(bu)線(xian)(xian)(xian)越(yue)多就(jiu)(jiu)(jiu)說(shuo)明(ming)有更(geng)高的(de)(de)(de)(de)(de)(de)(de)設(she)計水(shui)平(ping),這(zhe)種(zhong)觀(guan)點(dian)是(shi)(shi)錯誤的(de)(de)(de)(de)(de)(de)(de)。采用(yong)蛇(she)(she)行(xing)(xing)(xing)布(bu)(bu)線(xian)(xian)(xian)的(de)(de)(de)(de)(de)(de)(de)原(yuan)因(yin)有兩個:一(yi)個是(shi)(shi)為了保證(zheng)布(bu)(bu)線(xian)(xian)(xian)線(xian)(xian)(xian)路(lu)(lu)(lu)的(de)(de)(de)(de)(de)(de)(de)等(deng)長(chang)(chang),因(yin)為像CPU到(dao)北橋芯(xin)片的(de)(de)(de)(de)(de)(de)(de)時鐘(zhong)線(xian)(xian)(xian),它(ta)不(bu)(bu)(bu)同(tong)(tong)于普通電器上的(de)(de)(de)(de)(de)(de)(de)線(xian)(xian)(xian)路(lu)(lu)(lu),在這(zhe)些線(xian)(xian)(xian)路(lu)(lu)(lu)上以100MHz左右的(de)(de)(de)(de)(de)(de)(de)頻率(lv)高速(su)運行(xing)(xing)(xing)的(de)(de)(de)(de)(de)(de)(de)信(xin)(xin)號對線(xian)(xian)(xian)路(lu)(lu)(lu)的(de)(de)(de)(de)(de)(de)(de)長(chang)(chang)度(du)十分的(de)(de)(de)(de)(de)(de)(de)敏感(gan),不(bu)(bu)(bu)等(deng)長(chang)(chang)的(de)(de)(de)(de)(de)(de)(de)時鐘(zhong)布(bu)(bu)線(xian)(xian)(xian)路(lu)(lu)(lu)會(hui)(hui)(hui)引起信(xin)(xin)號的(de)(de)(de)(de)(de)(de)(de)不(bu)(bu)(bu)同(tong)(tong)步進(jin)而造(zao)成(cheng)(cheng)系統(tong)不(bu)(bu)(bu)穩,這(zhe)樣某(mou)些線(xian)(xian)(xian)路(lu)(lu)(lu)需要(yao)以彎曲(qu)的(de)(de)(de)(de)(de)(de)(de)方式(shi)走線(xian)(xian)(xian),以調節長(chang)(chang)度(du);另一(yi)個使(shi)用(yong)蛇(she)(she)行(xing)(xing)(xing)布(bu)(bu)線(xian)(xian)(xian)的(de)(de)(de)(de)(de)(de)(de)常見(jian)原(yuan)因(yin)是(shi)(shi)為了盡(jin)可(ke)能減少電磁輻射(EMI)對主板(ban)(ban)其余部(bu)件(jian)和人體(ti)的(de)(de)(de)(de)(de)(de)(de)影(ying)響,因(yin)為高速(su)而單調的(de)(de)(de)(de)(de)(de)(de)數字信(xin)(xin)號會(hui)(hui)(hui)大大地干擾主板(ban)(ban)上模擬器件(jian)的(de)(de)(de)(de)(de)(de)(de)工(gong)(gong)(gong)作,如AC''97芯(xin)片或(huo)板(ban)(ban)載(zai)的(de)(de)(de)(de)(de)(de)(de)軟貓等(deng)。平(ping)常抑(yi)制EMI的(de)(de)(de)(de)(de)(de)(de)一(yi)種(zhong)簡便方法就(jiu)(jiu)(jiu)是(shi)(shi)通過設(she)計蛇(she)(she)形布(bu)(bu)線(xian)(xian)(xian),來(lai)盡(jin)可(ke)能多吸收消化(hua)輻射。采用(yong)蛇(she)(she)行(xing)(xing)(xing)布(bu)(bu)線(xian)(xian)(xian)有了上面這(zhe)些好處,并不(bu)(bu)(bu)是(shi)(shi)說(shuo)在工(gong)(gong)(gong)控主板(ban)(ban)布(bu)(bu)線(xian)(xian)(xian)設(she)計的(de)(de)(de)(de)(de)(de)(de)時候(hou)使(shi)用(yong)蛇(she)(she)行(xing)(xing)(xing)布(bu)(bu)線(xian)(xian)(xian)越(yue)多越(yue)好,因(yin)為過多過密的(de)(de)(de)(de)(de)(de)(de)主板(ban)(ban)布(bu)(bu)線(xian)(xian)(xian)會(hui)(hui)(hui)造(zao)成(cheng)(cheng)工(gong)(gong)(gong)控主板(ban)(ban)布(bu)(bu)局的(de)(de)(de)(de)(de)(de)(de)疏密不(bu)(bu)(bu)均,會(hui)(hui)(hui)對工(gong)(gong)(gong)控主板(ban)(ban)的(de)(de)(de)(de)(de)(de)(de)質(zhi)量(liang)有一(yi)定(ding)的(de)(de)(de)(de)(de)(de)(de)影(ying)響。好的(de)(de)(de)(de)(de)(de)(de)布(bu)(bu)線(xian)(xian)(xian)應使(shi)工(gong)(gong)(gong)控主板(ban)(ban)上各部(bu)分線(xian)(xian)(xian)路(lu)(lu)(lu)密度(du)差別不(bu)(bu)(bu)大,并且要(yao)盡(jin)可(ke)能均勻分布(bu)(bu)否則很(hen)容(rong)易造(zao)成(cheng)(cheng)工(gong)(gong)(gong)控主板(ban)(ban)的(de)(de)(de)(de)(de)(de)(de)不(bu)(bu)(bu)穩定(ding)。
二、做(zuo)工用(yong)料
1、PCB(印刷電路(lu)板)的做工(gong)
質(zhi)量(liang)有(you)保(bao)證的(de)PC板(ban)(ban)色彩(cai)基(ji)本保(bao)持(chi)一致,光潔度(du)好(hao),看起(qi)來油光發亮的(de)一般(ban)質(zhi)量(liang)就(jiu)比較(jiao)好(hao)。PCB板(ban)(ban)層(ceng)(ceng)數一般(ban)的(de)標準是(shi)4、6層(ceng)(ceng)板(ban)(ban),當然6層(ceng)(ceng)板(ban)(ban)質(zhi)量(liang)要好(hao)很多。
2、SMT(表面貼裝)元器件的(de)做工
主要(yao)通過(guo)觀察某(mou)些元(yuan)(yuan)器(qi)件貼(tie)裝精度來判定(ding)主板(ban)的生產工藝是否精良,標準(zhun)的元(yuan)(yuan)器(qi)件貼(tie)裝定(ding)位準(zhun)確,沒有偏移(yi)。
3、工控主板用料
名(ming)牌大廠所生產的工控主板用(yong)料,像CPU插(cha)座(zuo)、擴展槽和插(cha)槽等都采用(yong)名(ming)廠的插(cha)接界面元器件(jian),主板的性能也(ye)就不(bu)用(yong)多說(shuo)了(le)。