二極(ji)管是電源(yuan)適配器(qi)中的(de)重要元(yuan)件之(zhi)一，也(ye)是在生產時經(jing)常(chang)需要(yao)采(cai)購的元件，那么如何(he)對二極管進(jin)行質量檢(jian)測(ce)呢？這(zhe)里有一(yi)些方法交給大(da)家。

外觀檢驗

1  主體是否破損、破裂、變形.            

2 引腳是否氧化、生鏽、脫落.            

3 印刷是(shi)否模(mo)糊(hu)不清、脫落.            

4 正負標識是否(fou)錯(cuo)誤.  

功能檢(jian)測

普通(tong)二極管的功能檢(jian)測(ce)

1普通(tong)二極管正向壓降的檢(jian)測(ce)

將被測二(er)極(ji)管(guan)串入(ru)電(dian)(dian)(dian)(dian)路中,調整(zheng)可調穩壓(ya)(ya)源電(dian)(dian)(dian)(dian)壓(ya)(ya),使電(dian)(dian)(dian)(dian)流表所(suo)顯(xian)(xian)示的(de)電(dian)(dian)(dian)(dian)流值達(da)到規格(ge)要(yao)求,此(ci)時電(dian)(dian)(dian)(dian)壓(ya)(ya)表所(suo)顯(xian)(xian)示的(de)電(dian)(dian)(dian)(dian)壓(ya)(ya)即(ji)為該二(er)極(ji)管(guan)的(de)正向壓(ya)(ya)降,或(huo)用數(shu)字萬用表正向電(dian)(dian)(dian)(dian)壓(ya)(ya)檢測電(dian)(dian)(dian)(dian)路二(er)極(ji)管(guan)檔位(wei)直接測試,所(suo)顯(xian)(xian)示的(de)值應在要(yao)求范(fan)圍內. 如IN4148    

鍺管(guan)      正向壓降一般(ban)為0.1~0.3V                            

硅管      正向壓(ya)降一(yi)般為0.5~0.7V

2普通(tong)二極(ji)管(guan)反(fan)向電(dian)流的檢測

將被(bei)測二(er)(er)極(ji)(ji)管(guan)串(chuan)入電(dian)(dian)(dian)(dian)路中,調整(zheng)可調穩(wen)(wen)壓(ya)(ya)(ya)源(yuan)(yuan)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)使電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)表所(suo)顯示(shi)的(de)(de)(de)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)值達到規(gui)格要求,此時電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)表所(suo)顯示(shi)的(de)(de)(de)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)值即(ji)(ji)為該(gai)二(er)(er)極(ji)(ji)管(guan)的(de)(de)(de)反向(xiang)(xiang)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu).  穩(wen)(wen)壓(ya)(ya)(ya)二(er)(er)極(ji)(ji)管(guan)的(de)(de)(de)功能檢測穩(wen)(wen)壓(ya)(ya)(ya)二(er)(er)極(ji)(ji)管(guan)穩(wen)(wen)壓(ya)(ya)(ya)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)的(de)(de)(de)檢測. 將被(bei)測二(er)(er)極(ji)(ji)管(guan)串(chuan)入線路中,調整(zheng)可調穩(wen)(wen)壓(ya)(ya)(ya)電(dian)(dian)(dian)(dian)源(yuan)(yuan)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya),使電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)表所(suo)顯示(shi)的(de)(de)(de)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)達到規(gui)格要求,此時電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)表所(suo)顯示(shi)的(de)(de)(de)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)即(ji)(ji)為該(gai)二(er)(er)極(ji)(ji)極(ji)(ji)管(guan)的(de)(de)(de)穩(wen)(wen)壓(ya)(ya)(ya)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya).  穩(wen)(wen)壓(ya)(ya)(ya)二(er)(er)極(ji)(ji)管(guan)反向(xiang)(xiang)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)的(de)(de)(de)檢測(同普通(tong)二(er)(er)極(ji)(ji)管(guan)反向(xiang)(xiang)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)的(de)(de)(de)檢測)

以上就是電源適配器二極管(guan)的檢(jian)測(ce)過程。好電源來自(zi)好材料，嚴格的質(zhi)量檢(jian)測(ce)可以確保元件的質(zhi)量品質(zhi)，是電源質(zhi)量的基本(ben)保障。