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常見電子元器件檢測經驗和技巧
添加時間:2020-11-27 15:54:18 出處:恒南電子 作者:恒南電子 點擊:1346

電(dian)子(zi)設(she)備(bei)中(zhong)使用著大(da)量各種類型的電(dian)子(zi)元(yuan)器件(jian)(jian),設(she)備(bei)發生故障大(da)多是由于電(dian)子(zi)元(yuan)器件(jian)(jian)失效或損壞引起的。因此(ci)怎么(me)正確檢(jian)測電(dian)子(zi)元(yuan)器件(jian)(jian)就顯得尤(you)其重要(yao),這也是電(dian)子(zi)維修人(ren)員(yuan)必(bi)須(xu)掌握的技能(neng)。下面是部分常(chang)見電(dian)子(zi)元(yuan)器件(jian)(jian)檢(jian)測經驗和技巧,供(gong)大(da)家參考。


1.測(ce)整流電橋各(ge)腳的極性

萬用表(biao)(biao)(biao)置R×1k擋,黑表(biao)(biao)(biao)筆(bi)(bi)接橋(qiao)(qiao)堆的任(ren)意引腳(jiao),紅表(biao)(biao)(biao)筆(bi)(bi)先(xian)后(hou)測其余三只腳(jiao),如果讀數(shu)均為無(wu)窮大,則黑表(biao)(biao)(biao)筆(bi)(bi)所(suo)接為橋(qiao)(qiao)堆的輸出正極(ji),如果讀數(shu)為4~10kΩ,則黑表(biao)(biao)(biao)筆(bi)(bi)所(suo)接引腳(jiao)為橋(qiao)(qiao)堆的輸出負極(ji),其余的兩引腳(jiao)為橋(qiao)(qiao)堆的交流輸入端。


2.判(pan)斷晶振的好壞

先(xian)用(yong)萬用(yong)表(R×10k擋)測晶振(zhen)(zhen)(zhen)兩端的(de)(de)電(dian)阻值,若(ruo)為無(wu)窮大,說(shuo)明(ming)(ming)晶振(zhen)(zhen)(zhen)無(wu)短路或漏電(dian);再將(jiang)試電(dian)筆(bi)(bi)插入市(shi)電(dian)插孔內,用(yong)手指捏住晶振(zhen)(zhen)(zhen)的(de)(de)任一引腳(jiao),將(jiang)另(ling)一引腳(jiao)碰(peng)觸試電(dian)筆(bi)(bi)頂端的(de)(de)金屬部分,若(ruo)試電(dian)筆(bi)(bi)氖泡發紅,說(shuo)明(ming)(ming)晶振(zhen)(zhen)(zhen)是(shi)好的(de)(de);若(ruo)氖泡不亮,則說(shuo)明(ming)(ming)晶振(zhen)(zhen)(zhen)損(sun)壞。


3.單向晶(jing)閘管(guan)檢測

可用(yong)(yong)萬用(yong)(yong)表(biao)的(de)R×1k或R×100擋測(ce)量(liang)任意兩極(ji)(ji)(ji)之問的(de)正、反向(xiang)電(dian)(dian)阻(zu),如果(guo)找到一對(dui)極(ji)(ji)(ji)的(de)電(dian)(dian)阻(zu)為(wei)(wei)低阻(zu)值(100Ω~lkΩ),則此(ci)時(shi)黑表(biao)筆所接(jie)的(de)為(wei)(wei)控(kong)制(zhi)極(ji)(ji)(ji),紅表(biao)筆所接(jie)為(wei)(wei)陰極(ji)(ji)(ji),另(ling)一個(ge)極(ji)(ji)(ji)為(wei)(wei)陽(yang)極(ji)(ji)(ji)。晶閘管共有3個(ge)PN結,我(wo)們可以(yi)通過(guo)測(ce)量(liang)PN結正、反向(xiang)電(dian)(dian)阻(zu)的(de)大(da)小來判別它的(de)好壞(huai)。測(ce)量(liang)控(kong)制(zhi)極(ji)(ji)(ji)(G)與陰極(ji)(ji)(ji)[C)之間的(de)電(dian)(dian)阻(zu)時(shi),如果(guo)正、反向(xiang)電(dian)(dian)阻(zu)均為(wei)(wei)零或無窮大(da),表(biao)明控(kong)制(zhi)極(ji)(ji)(ji)短路或斷路;測(ce)量(liang)控(kong)制(zhi)極(ji)(ji)(ji)(G)與陽(yang)極(ji)(ji)(ji)(A)之間的(de)電(dian)(dian)阻(zu)時(shi),正、反向(xiang)電(dian)(dian)阻(zu)讀數(shu)均應很大(da);

{測(ce)量陽極(A)與陰(yin)極(C)之間的電(dian)阻時,正、反(fan)向電(dian)阻都應很大。


4.雙向晶(jing)閘管的極性識別

雙(shuang)向晶閘管(guan)有(you)主(zhu)(zhu)電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)1、主(zhu)(zhu)電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)2和控(kong)制極(ji)(ji),如果用萬(wan)用表(biao)R×1k擋測(ce)(ce)量(liang)兩(liang)個(ge)主(zhu)(zhu)電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)之間的(de)電(dian)(dian)(dian)(dian)(dian)阻,讀數應(ying)近似無窮大,而控(kong)制極(ji)(ji)與任一(yi)個(ge)主(zhu)(zhu)電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)之間的(de)正(zheng)、反向電(dian)(dian)(dian)(dian)(dian)阻讀數只有(you)幾十歐(ou)。根據這一(yi)特性,我們(men)很(hen)容(rong)易(yi)通過(guo)測(ce)(ce)量(liang)電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)之間電(dian)(dian)(dian)(dian)(dian)阻大小,識別出雙(shuang)向晶閘管(guan)的(de)控(kong)制極(ji)(ji)。而當黑(hei)表(biao)筆接(jie)主(zhu)(zhu)電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)1。紅表(biao)筆接(jie)控(kong)制極(ji)(ji)時所測(ce)(ce)得的(de)正(zheng)向電(dian)(dian)(dian)(dian)(dian)阻總是要比反向電(dian)(dian)(dian)(dian)(dian)阻小一(yi)些(xie),據此我們(men)也很(hen)容(rong)易(yi)通過(guo)測(ce)(ce)量(liang)電(dian)(dian)(dian)(dian)(dian)阻大小來識別主(zhu)(zhu)電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)1和主(zhu)(zhu)電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)2。


5.檢查發光數碼管的(de)好壞(huai)

先(xian)將(jiang)萬用表置R×10k或R×l00k擋,然后將(jiang)紅(hong)表筆與數(shu)碼(ma)(ma)管(guan)(以共陰(yin)數(shu)碼(ma)(ma)管(guan)為例)的(de)“地(di)”引出(chu)端相連,黑表筆依次接數(shu)碼(ma)(ma)管(guan)其他引出(chu)端,七段均(jun)應分別發光,否(fou)則說明數(shu)碼(ma)(ma)管(guan)損壞。


6.判別結(jie)型場效(xiao)應管的電極

將萬用(yong)表置于R×1k擋,用(yong)黑(hei)表筆(bi)接(jie)(jie)觸(chu)(chu)假定為(wei)(wei)柵極(ji)G的(de)(de)管(guan)腳,然后(hou)用(yong)紅表筆(bi)分別接(jie)(jie)觸(chu)(chu)另外兩個管(guan)腳,若(ruo)阻(zu)(zu)值均比(bi)較小(5~10 Ω),再(zai)將紅、黑(hei)表筆(bi)交換(huan)(huan)(huan)測量一次(ci)(ci)。如阻(zu)(zu)值均大(da)(∞),說(shuo)(shuo)(shuo)明都是反(fan)向電(dian)阻(zu)(zu)(PN結(jie)反(fan)向),屬(shu)N溝(gou)道(dao)管(guan),且黑(hei)表筆(bi)接(jie)(jie)觸(chu)(chu)的(de)(de)管(guan)腳為(wei)(wei)柵極(ji)G,并說(shuo)(shuo)(shuo)明原先假定是正(zheng)確(que)的(de)(de)。若(ruo)再(zai)次(ci)(ci)測量的(de)(de)阻(zu)(zu)值均很小,說(shuo)(shuo)(shuo)明是正(zheng)向電(dian)阻(zu)(zu),屬(shu)于P溝(gou)道(dao)場(chang)效(xiao)應管(guan),黑(hei)表筆(bi)所(suo)接(jie)(jie)的(de)(de)也是柵極(ji)G。若(ruo)不(bu)出現(xian)上(shang)述(shu)情況,可以(yi)(yi)調換(huan)(huan)(huan)紅、黑(hei)表筆(bi),按上(shang)述(shu)方法進行(xing)測試,直至判斷(duan)出柵極(ji)為(wei)(wei)止。一般結(jie)型場(chang)效(xiao)應管(guan)的(de)(de)源(yuan)極(ji)與漏極(ji)在制造時(shi)是對稱的(de)(de),所(suo)以(yi)(yi),當柵極(ji)G確(que)定以(yi)(yi)后(hou),對于源(yuan)極(ji)S、漏極(ji)D不(bu)一定要(yao)判別,因為(wei)(wei)這兩個極(ji)可以(yi)(yi)互換(huan)(huan)(huan)使用(yong)。源(yuan)極(ji)與漏極(ji)之間的(de)(de)電(dian)阻(zu)(zu)為(wei)(wei)幾千(qian)歐(ou)。


7.三極(ji)管電極(ji)的判別

對于一只(zhi)型號標(biao)示(shi)不(bu)清或無標(biao)志(zhi)的(de)(de)三極(ji)(ji)管(guan)(guan),要想分辨出它們的(de)(de)三個(ge)電(dian)(dian)極(ji)(ji),也可用萬(wan)用表(biao)測(ce)試。先將萬(wan)用表(biao)量程開關(guan)撥(bo)在R×100或R×1k電(dian)(dian)阻擋(dang)上(shang)。紅(hong)表(biao)筆任意接(jie)(jie)觸三極(ji)(ji)管(guan)(guan)的(de)(de)一個(ge)電(dian)(dian)極(ji)(ji),黑表(biao)筆依次接(jie)(jie)觸另外兩(liang)個(ge)電(dian)(dian)極(ji)(ji),分別(bie)測(ce)量它們之(zhi)間的(de)(de)電(dian)(dian)阻值,若測(ce)出均(jun)為(wei)(wei)幾(ji)百(bai)歐低電(dian)(dian)阻時,則紅(hong)表(biao)筆接(jie)(jie)觸的(de)(de)電(dian)(dian)極(ji)(ji)為(wei)(wei)基(ji)極(ji)(ji)b,此管(guan)(guan)為(wei)(wei)PNP管(guan)(guan)。若測(ce)出均(jun)為(wei)(wei)幾(ji)十至上(shang)百(bai)千(qian)歐的(de)(de)高電(dian)(dian)阻時,則紅(hong)表(biao)筆接(jie)(jie)觸的(de)(de)電(dian)(dian)極(ji)(ji)也為(wei)(wei)基(ji)極(ji)(ji)b,此管(guan)(guan)為(wei)(wei)NPN管(guan)(guan)。

在(zai)判別(bie)出管(guan)型和基(ji)極(ji)(ji)(ji)(ji)b的(de)基(ji)礎上(shang),利(li)用三極(ji)(ji)(ji)(ji)管(guan)正向電(dian)(dian)(dian)流放大(da)(da)系(xi)數比(bi)反向電(dian)(dian)(dian)流放大(da)(da)系(xi)數大(da)(da)的(de)原(yuan)理確定集電(dian)(dian)(dian)極(ji)(ji)(ji)(ji)。任(ren)意假定一個(ge)電(dian)(dian)(dian)極(ji)(ji)(ji)(ji)為c極(ji)(ji)(ji)(ji),另一個(ge)電(dian)(dian)(dian)極(ji)(ji)(ji)(ji)為e極(ji)(ji)(ji)(ji)。將萬用表量程開關撥在(zai)R×1k電(dian)(dian)(dian)阻(zu)擋上(shang)。對于(yu):PNP管(guan),令(ling)紅表筆(bi)接(jie)c極(ji)(ji)(ji)(ji),黑表筆(bi)接(jie)e極(ji)(ji)(ji)(ji),再用手同時捏一下管(guan)子的(de)b、c極(ji)(ji)(ji)(ji),但不能(neng)使(shi)b、c兩(liang)(liang)極(ji)(ji)(ji)(ji)直接(jie)相碰,測(ce)出某一阻(zu)值。然(ran)后(hou)兩(liang)(liang)表筆(bi)對調進行第二次(ci)測(ce)量,將兩(liang)(liang)次(ci)測(ce)的(de)電(dian)(dian)(dian)阻(zu)相比(bi)較(jiao),對于(yu):PNP型管(guan),阻(zu)值小的(de)一次(ci),紅表筆(bi)所接(jie)的(de)電(dian)(dian)(dian)極(ji)(ji)(ji)(ji)為集電(dian)(dian)(dian)極(ji)(ji)(ji)(ji)。對于(yu)NPN型管(guan)阻(zu)值小的(de)一次(ci),黑表筆(bi)所接(jie)的(de)電(dian)(dian)(dian)極(ji)(ji)(ji)(ji)為集電(dian)(dian)(dian)極(ji)(ji)(ji)(ji)。


8.電位(wei)器(qi)的好壞判別

先測(ce)電(dian)位器的標(biao)稱阻值(zhi)(zhi)。用(yong)(yong)萬(wan)(wan)(wan)用(yong)(yong)表(biao)(biao)(biao)的歐姆(mu)擋測(ce)“1”、“3”兩端(duan)(duan)(設“2”端(duan)(duan)為(wei)活動(dong)(dong)(dong)觸(chu)點(dian)),其讀數應(ying)為(wei)電(dian)位器的標(biao)稱值(zhi)(zhi),如(ru)萬(wan)(wan)(wan)用(yong)(yong)表(biao)(biao)(biao)的指針不動(dong)(dong)(dong)、阻值(zhi)(zhi)不動(dong)(dong)(dong)或阻值(zhi)(zhi)相差很多(duo),則表(biao)(biao)(biao)明該電(dian)位器已損(sun)壞。再檢查電(dian)位器的活動(dong)(dong)(dong)臂(bei)與(yu)電(dian)阻片的接觸(chu)是否(fou)良好。用(yong)(yong)萬(wan)(wan)(wan)用(yong)(yong)表(biao)(biao)(biao)的歐姆(mu)擋測(ce)“1”、“2”或“2”、“3”兩端(duan)(duan),將(jiang)電(dian)位器的轉軸(zhou)(zhou)按逆時(shi)(shi)針方(fang)向旋至(zhi)(zhi)接近(jin)(jin)“關(guan)”的位置(zhi),此時(shi)(shi)電(dian)阻應(ying)越(yue)小(xiao)越(yue)好,再徐(xu)徐(xu)順時(shi)(shi)鐘旋轉軸(zhou)(zhou)柄(bing),電(dian)阻應(ying)逐(zhu)漸(jian)增大(da),旋至(zhi)(zhi)極端(duan)(duan)位置(zhi)時(shi)(shi),阻值(zhi)(zhi)應(ying)接近(jin)(jin)電(dian)位器的標(biao)稱值(zhi)(zhi)。如(ru)在電(dian)位器的軸(zhou)(zhou)柄(bing)轉動(dong)(dong)(dong)過程中(zhong)萬(wan)(wan)(wan)用(yong)(yong)表(biao)(biao)(biao)指針有(you)跳動(dong)(dong)(dong)瑚象,描踢活動(dong)(dong)(dong)觸(chu)』點(dian)接觸(chu)不良。


9.測量大(da)容量電(dian)容的漏電(dian)電(dian)阻

用(yong)(yong)500型(xing)萬用(yong)(yong)表置于R×10或(huo)R×100擋,待(dai)指針指向(xiang)最大(da)值(zhi)時(shi)(shi),再立即改用(yong)(yong)R×1k擋測(ce)量(liang),指針會在較短時(shi)(shi)間內穩定,從(cong)而讀(du)出(chu)漏電電阻(zu)阻(zu)值(zhi)。


10.判別紅(hong)外(wai)接收(shou)頭引腳

萬用表(biao)置R×1k擋,先(xian)假設(she)接(jie)(jie)收(shou)頭的(de)某腳為接(jie)(jie)地端,將其(qi)與(yu)黑表(biao)筆(bi)相接(jie)(jie),用紅表(biao)筆(bi)分(fen)別測(ce)量另兩(liang)腳電阻(zu)(zu),對比兩(liang)次所測(ce)阻(zu)(zu)值(zhi)(一(yi)(yi)般在4~7k Q范圍),電阻(zu)(zu)較小的(de)一(yi)(yi)次其(qi)紅表(biao)筆(bi)所接(jie)(jie)為+5V電源引(yin)(yin)腳,另一(yi)(yi)阻(zu)(zu)值(zhi)較大的(de)則為信號引(yin)(yin)腳。反之,若用紅表(biao)筆(bi)接(jie)(jie)已(yi)知地腳,黑表(biao)筆(bi)分(fen)別測(ce)已(yi)知電源腳及(ji)信號腳,則阻(zu)(zu)值(zhi)都在15kΩ以上,阻(zu)(zu)值(zhi)小的(de)引(yin)(yin)腳為+5V端,阻(zu)(zu)值(zhi)偏大的(de)引(yin)(yin)腳為信號端。如(ru)果(guo)測(ce)量結果(guo)符合上述阻(zu)(zu)值(zhi)則可判斷該接(jie)(jie)收(shou)頭完好。


11.判斷無符(fu)號電解電容極性

先將電容短(duan)路放(fang)電,再將兩引線(xian)做好(hao)A、B標記,萬用表(biao)置R×100或R×1k擋,黑(hei)(hei)表(biao)筆接(jie)(jie)A引線(xian),紅(hong)表(biao)筆接(jie)(jie)B引線(xian),待指(zhi)針靜止不動后讀數,測完后短(duan)路放(fang)電;再將黑(hei)(hei)表(biao)筆接(jie)(jie)B引線(xian),紅(hong)表(biao)筆接(jie)(jie)A引線(xian),比較(jiao)(jiao)兩次讀數,阻值較(jiao)(jiao)大(da)的一次黑(hei)(hei)表(biao)筆所接(jie)(jie)為正極(ji),紅(hong)表(biao)筆所接(jie)(jie)為負極(ji)。


12.測發光二極(ji)管

取一個容(rong)量大于100“F的(de)電(dian)解(jie)電(dian)容(rong)器(容(rong)量越(yue)大,現象越(yue)明顯),先用萬用表(biao)(biao)(biao)R×100擋對其(qi)充(chong)(chong)電(dian),黑(hei)表(biao)(biao)(biao)筆(bi)(bi)接(jie)(jie)電(dian)容(rong)正(zheng)(zheng)(zheng)極(ji),紅表(biao)(biao)(biao)筆(bi)(bi)接(jie)(jie)負極(ji),充(chong)(chong)電(dian)完畢(bi)后(hou),黑(hei)表(biao)(biao)(biao)筆(bi)(bi)改接(jie)(jie)電(dian)容(rong)負極(ji),將(jiang)被測發(fa)光(guang)二(er)極(ji)管(guan)接(jie)(jie)于紅表(biao)(biao)(biao)筆(bi)(bi)和電(dian)容(rong)正(zheng)(zheng)(zheng)極(ji)之間。如(ru)果(guo)發(fa)光(guang)二(er)極(ji)管(guan)亮(liang)(liang)后(hou)逐漸熄(xi)滅,表(biao)(biao)(biao)明它是(shi)好的(de)。此時紅表(biao)(biao)(biao)筆(bi)(bi)接(jie)(jie)的(de)是(shi)發(fa)光(guang)二(er)極(ji)管(guan)的(de)負極(ji),電(dian)容(rong)正(zheng)(zheng)(zheng)極(ji)接(jie)(jie)的(de)是(shi)發(fa)光(guang)二(er)極(ji)管(guan)的(de)正(zheng)(zheng)(zheng)極(ji)。如(ru)果(guo)發(fa)光(guang)二(er)極(ji)管(guan)不(bu)亮(liang)(liang),將(jiang)其(qi)兩端對調重新接(jie)(jie)上測試(shi),還(huan)不(bu)亮(liang)(liang),表(biao)(biao)(biao)明發(fa)光(guang)二(er)極(ji)管(guan)已損壞。


13.光電耦合器檢測

萬(wan)(wan)用(yong)(yong)(yong)表選(xuan)用(yong)(yong)(yong)電(dian)阻(zu)R×100擋(dang)(dang),不得選(xuan)R×10k擋(dang)(dang),以防電(dian)池電(dian)壓(ya)過高擊穿發(fa)光二極(ji)管。紅(hong)、黑(hei)(hei)表筆(bi)接(jie)(jie)輸入端(duan),測(ce)正(zheng)、反(fan)向(xiang)(xiang)電(dian)阻(zu),正(zheng)常時(shi)正(zheng)向(xiang)(xiang)電(dian)阻(zu)為數十歐姆,反(fan)向(xiang)(xiang)電(dian)阻(zu)幾(ji)千歐至幾(ji)十千歐。若正(zheng)、反(fan)向(xiang)(xiang)電(dian)阻(zu)相近,表明發(fa)光二極(ji)管已損(sun)壞(huai)。萬(wan)(wan)用(yong)(yong)(yong)表選(xuan)電(dian)阻(zu)R×1擋(dang)(dang)。紅(hong)、黑(hei)(hei)表筆(bi)接(jie)(jie)輸出端(duan),測(ce)正(zheng)、反(fan)向(xiang)(xiang)電(dian)阻(zu),正(zheng)常時(shi)均接(jie)(jie)近于∞,否(fou)則(ze)受光管損(sun)壞(huai)。萬(wan)(wan)用(yong)(yong)(yong)表選(xuan)電(dian)阻(zu)R×10擋(dang)(dang),紅(hong)、黑(hei)(hei)表筆(bi)分別接(jie)(jie)輸入、輸出端(duan)測(ce)發(fa)光管與受光管之間的(de)(de)絕(jue)緣(yuan)電(dian)阻(zu)(有條件(jian)應用(yong)(yong)(yong)兆(zhao)(zhao)歐表測(ce)其絕(jue)緣(yuan)電(dian)阻(zu),此時(shi)兆(zhao)(zhao)歐表輸出額定電(dian)壓(ya)應略低于被測(ce)光電(dian)耦合器所(suo)允許的(de)(de)耐壓(ya)值),發(fa)光管與受光管問絕(jue)緣(yuan)電(dian)阻(zu)正(zheng)常應為∞。


14.光敏電阻的(de)檢測(ce)

將(jiang)萬用(yong)表(biao)撥到R×1kΩ擋,把光(guang)(guang)敏電阻(zu)的受光(guang)(guang)面與入射光(guang)(guang)線保(bao)持垂(chui)直,于是在(zai)萬用(yong)表(biao)上直接測得的電阻(zu)就是亮阻(zu)。再把光(guang)(guang)敏電阻(zu)置于完全(quan)黑暗的場所,這(zhe)時萬用(yong)表(biao)所測出的電阻(zu)就是暗阻(zu)。如果亮阻(zu)為幾(ji)千歐(ou)至(zhi)幾(ji)十(shi)干歐(ou),暗阻(zu)為幾(ji)至(zhi)幾(ji)十(shi)兆歐(ou),說明光(guang)(guang)敏電阻(zu)是好的。


15.激光(guang)二極管損壞判別

拆下激(ji)光二極管,測量其阻(zu)值(zhi),正常情況下反向(xiang)阻(zu)值(zhi)應(ying)為無(wu)窮大,正向(xiang)阻(zu)值(zhi)在(zai)20kΩ~40kΩ。如果(guo)所測的正向(xiang)阻(zu)值(zhi)已(yi)(yi)(yi)超(chao)過(guo)50kΩ,說明激(ji)光二極管性能已(yi)(yi)(yi)下降;如果(guo)其正向(xiang)阻(zu)值(zhi)已(yi)(yi)(yi)超(chao)過(guo)90kΩ,說明該管已(yi)(yi)(yi)損壞,不能再使用了。


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