Vim li cas ho tsis cov digital multimeter tso rau pem hauv ntej thiab thim rov qab ntawm lub diode?
Vim li cas ho tsis tuaj yeem ntsuas diodes nrog cov ntaub ntawv tiv thaiv?
Lub unidirectional conductivity ntawm diode yog conditional, uas yog, PN hlws ris ntawm lub diode yog rau pem hauv ntej biased ua ntej ua. Tsuas yog siv cov iav tiv thaiv los ntsuas qhov tsis kam, lub diode nws tus kheej tsis yog conductive, yog li qhov kev tiv thaiv tsis tuaj yeem ntsuas. Lub diode iav ntawm lub multimeter feem ntau yog hais txog 1.5-2.8V nrog voltage. Thaum ntsuas lub diode, qhov hluav taws xob tau siv rau ob qhov kawg ntawm lub diode, kom lub PN hlws ris yog rau pem hauv ntej biased. Tsuas yog tom qab ntawd tuaj yeem pom qhov hluav taws xob poob li ntawm 0.7V ntawm lub multimeter, uas ua pov thawj tias lub diode zoo. Qhov kev tiv thaiv ntsuas los ntawm lub ntsuas ntsuas ntsuas tsis raug, thiab cov txiaj ntsig tau los ntawm kev ntsuas cov diodes sib txawv kuj txawv.
Txoj kev ntsuas diode nrog multimeter
Lub diode yuav tsum tau ntsuas nrog lub diode iav ntawm multimeter. Tig lub multimeter mus rau lub diode txoj hauj lwm, ntxig lub liab sojntsuam mus rau qhov zoo kawg thiab dub sojntsuam mus rau qhov tsis zoo kawg.
Kov ob lub electrodes ntawm lub diode nyob rau hauv kev sim nrog ib tug liab stylus thiab ib tug dub stylus. Yog hais tias lub diode qhia tau hais tias qhov hluav taws xob poob ntawm li 0.7V, nws txhais tau hais tias ib qho kawg tiv tauj los ntawm lub stylus liab yog lub anode ntawm diode thiab lwm sab yog cathode ntawm diode.
Hloov cov kev taw qhia ntawm lub diode mus kuaj. Yog tias tus nqi hluav taws xob tsis tuaj yeem ntsuas tau, nws qhia tau hais tias lub stylus liab hu rau qhov tsis zoo electrode ntawm diode thiab dub stylus hu rau qhov zoo electrode ntawm diode.
Tom qab ob qho kev ntsuas saum toj no, lub anode thiab cathode ntawm diode tuaj yeem lees paub, thiab qhov zoo ntawm diode tuaj yeem lees paub.
Thaum lub digital multimeter nyob rau hauv qhov tsis kam, qhov voltage ntawm ob qhov kev sojntsuam yog qis, uas yog hais txog 0.6-0.7V qis dua rau pem hauv ntej conduction voltage ntawm zoo tib yam silicon diode, thiab lub diode yog nyob rau hauv lub xeev tawm. Tus nqi tsis kam ntawm lub xeev tawm yog qhov loj heev, yog li thaum ntsuas lub diode nrog lub tshuab digital multimeter, txawm tias nws yog pem hauv ntej lossis rov qab, cov nqi tso tawm tau dhau mus. Digital multimeters tag nrho muaj diode ntsuas iav, uas yuav tsum tau siv los ntsuas lub pem hauv ntej thiab thim rov qab on-off ntawm diodes.
Tsis tas li ntawd, lub diode yog cov khoom tsis muaj kab, thiab nws cov nqi kuj tsis raug kho. Thaum ntsuas lub pem hauv ntej-tsis kam ntawm diode nrog pointer multimeter kuj, nws yuav pom tau hais tias qhov kev tiv thaiv qhov tseem ceeb ntawm txawv zog sib txawv heev. Yog li ntawd, nws yog ib qho tseem ceeb me ntsis los ntsuas qhov tsis kam ntawm diode nrog multimeter, tsuav yog nws tuaj yeem ntsuas qhov kev coj mus rau pem hauv ntej thiab thim rov qab, los yog paub qhov txawv ntawm qhov zoo thiab qhov tsis zoo ntawm tus ncej thiab seb puas muaj qhov tawg lossis hlawv, thiab nws tsis tsim nyog. nyeem tus nqi tshwj xeeb kuj.
Cov multimeter digital muaj qhov tshwj xeeb diode ntsuas diode. Yog tias nws yuav tsum tau siv qhov ntsuas kev tiv thaiv, lub diode muaj qhov tsis kam ntawm ntau tshaj kaum ntawm K nyob rau hauv qhov kev taw qhia rov qab, yog li lub 'meter' qhia tau tias dhau 1. Muaj ob peb puas ohms mus rau ob peb k nyob rau hauv pem hauv ntej kev taw qhia, vim hais tias cov kuj yog. sib txawv vim qhov sib txawv voltages thov hla lub semiconductor diode. Yog li ntawd, lub diode feem ntau ntsuas nrog ib qho tshwj xeeb iav, qhov kev taw qhia rov qab yog feem ntau 1 (dhau), thiab kev taw qhia pem hauv ntej yog nyob nruab nrab ntawm 300 thiab 750 (qhov no yog qhov tseeb ntawm qhov poob), feem ntau nyob ib ncig ntawm 600 (silicon) thiab qis dua 500 ( germanium) tubes.
