Polarity thiab zoo ntawm scr tuaj yeem txiav txim nrog tus pointer multimeter lossis digital multimeter. Yunnan Changhui Instrument Manufacturing Co., Ltd. tau qhia cais kev siv ob lub ntsuas no hauv cov txheej txheem ntsuas cov polarity thiab zoo ntawm SCR.

1. Siv tus pointer multimeter los tshuaj xyuas qhov zoo thiab zoo ntawm SCR

Raws li lub hauv paus ntsiab lus ntawm PN kev sib txuas, qhov tsis kam ntawm peb tus ncej ntawm thyristor tuaj yeem ntsuas los ntawm ohmic block “R × 10” lossis “R × 100” thaiv los txiav txim seb nws puas zoo lossis tsis zoo. Muaj PN txuas ntawm kev tswj hluav taws xob G thiab cathode K ntawm thyristor. Raws li qhov xwm txheej ib txwm muaj, nws qhov kev tawm tsam mus tom ntej yog nyob ntawm kaum tawm ohms txog rau pua pua ohms, thiab qhov kev tawm tsam rov qab yog feem ntau loj dua qhov ua haujlwm rau pem hauv ntej. Qee zaum kev ntsuas rov qab tiv thaiv ntawm tus tswj kav yog me me, uas tsis tas yuav txhais tau tias tus tswj kav tsis muaj tus yam ntxwv tsis zoo. Nws feem ntau yog nyob ntawm seb nws ua tau raws li cov yam ntxwv ntawm PN txuas.

2. Siv digital multimeter los tshuaj xyuas qhov zoo thiab zoo ntawm SCR

Txiav txim siab qhov ntsuas hluav taws xob digital multimeter ntawm thyristor mus rau lub diode block, txuas cov xim liab coj mus rau ib qho hluav taws xob, thiab cov xim dub coj mus hu rau lwm ob lub tshuab hluav taws xob feem. Yog tias ib qho ntawm lawv pom tias qhov hluav taws xob yog ob peb feem kaum ntawm qhov hluav taws xob, tom qab ntawd cov hlau lead liab tau txuas nrog cov tswj hluav taws xob G, cov hlau lead dub kuaj tau txuas nrog rau cathode K, thiab qhov seem yog anode A. Yog tias nws qhia tau tias ob lub sijhawm dhau los, nws txhais tau tias cov hlau lead liab kuaj tsis txuas nrog cov tswj hluav taws xob, thiab cov electrode yuav tsum tau hloov thiab rov ntsuas dua.

Txhawm rau ntsuas qhov muaj peev xwm ua rau lub thyristor, cov ntsuas digital tau teeb tsa rau PNP block. Lub sijhawm no, ob lub qhov E ntawm lub qhov (socket) hFE raug them zoo, thiab C lub qhov raug them tsis zoo, thiab qhov hluav taws xob yog 2.8V. Peb qhov hluav taws xob ntawm cov thyristor raug coj tawm los ntawm xaim, anode A thiab cathode K txhuas tau tso rau hauv qhov E thiab C feem, thiab cov tswj hluav taws xob G raug tshem tawm. Lub sijhawm no, lub thyristor raug kaw, qhov anode tam sim no yog xoom, thiab 000 yuav tshwm.

Ntxig tus tswj kav G rau lwm qhov E. Tus nqi tso tawm yuav nce nrawm dua los ntawm 000 kom txog rau thaum lub cim txaws tau tshwm, thiab tom qab ntawd hloov tam sim ntawd rau 000, thiab tom qab ntawd hloov los ntawm 000 rau txeej dua, thiab ntxiv rau. Txoj hauv kev no tuaj yeem siv los txiav txim siab seb qhov pib ntawm thyristor puas ntseeg tau. Txawm li cas los xij, lub sijhawm sim yuav tsum tau luv dua kom ntau li ntau tau vim qhov tam sim no tseem ceeb hauv qhov kev xeem no. Yog tias tsim nyog, kev tiv thaiv tiv thaiv ntawm ntau pua ohms tuaj yeem txuas nrog hauv kab ntawm anode ntawm SCR.

Yog tias NPN thaiv tau siv, qhov anode A ntawm thyristor yuav tsum txuas nrog rau qhov C, thiab cathode K rau qhov E kom ntseeg tau tias qhov thov mus rau qhov hluav taws xob yog. Thaum kuaj xyuas qhov muaj peev xwm ua tau, tsis txhob ntxig cov tswj hluav taws xob rau hauv B qhov, vim tias qhov hluav taws xob ntawm B qhov qis, thiab SCR tsis tuaj yeem qhib.