Txheeb xyuas qhov ua haujlwm ntawm cov resistors, capacitors, diodes, thiab bipolar hlws ris transistors siv multimeter
1. Qhov txhaum ntawm resistor (R) yog tias tus nqi tiv thaiv tiag tiag tsis phim tus nqi tiv thaiv nominal. Yog li ntawd, ib tug multimeter ohm yuav siv tau los ntsuas qhov zoo ntawm cov resistor. Feem ntau, qhov txhaum ntawm lub resistor yog ib qho qhib Circuit Court ( ntsuas los ntawm ib tug multimeter nrog ib tug infinite resistance value), thiab txhaum ntawm ib tug resistor luv luv Circuit Court yog tsis tshua muaj heev.
2. Feem ntau cov kev ua txhaum ntawm capacitors (C) feem ntau tuaj yeem muab faib ua ob hom: kev tawg (luv luv Circuit Court thiab leakage los ntawm qee qhov laj thawj ntawm ob daim hlau ntawm lub capacitor (qhov rwb thaiv tsev tsis zoo ntawm lub capacitor tsawg dua li ib txwm), thiab qhib Circuit Court (cov hauv paus ntawm lub capacitor raug txiav tawm ntawm daim hlau, thiab lub capacitor tsis muaj peev xwm tsawg dua).
Kev ntsuas ntawm lub capacitor to thiab tawg: Teem lub multimeter mus rau X 10K txoj hauj lwm (siv X 1K txoj hauj lwm thaum ntsuas electrolytic capacitors), thiab thaum lub sij hawm ntsuas, lub multimeter pointer thawj swings rau hauv av nyob rau hauv cov kev taw qhia uas R yog xoom, thiab ces retracts mus rau qhov chaw uas R yog infinite. Tom qab lub pointer stabilizes, tus nqi kuj qhia tau hais tias yog lub rwb thaiv tsev tsis kam ntawm lub capacitor (rau electrolytic capacitors, dub sojntsuam ntawm lub multimeter yuav tsum tau txuas mus rau lub zoo davhlau ya nyob twg electrolytic capacitor).
Cov txiaj ntsig kev sim tau pom tias cov rwb thaiv tsev tsis kam ntawm electrolytic capacitors feem ntau yuav tsum yog ob peb puas kiloohms lossis ntau dua, thaum lub rwb thaiv tsev ntawm lwm cov capacitors yuav tsum yog ntau kaum ntawm megaohms lossis ntau dua. Yog tias cov rwb thaiv tsev tiv thaiv tsawg dua li cov nqi saum toj no, nws qhia tau hais tias cov dej ntws tawm ntawm lub capacitor tsis haum rau kev siv. Qhov me me ntawm cov rwb thaiv tsev tsis kam, qhov hnyav dua qhov to. Yog tias qhov hluav taws xob tsis zoo yog xoom, nws qhia tau tias lub capacitor tau tawg lawm.
3. Cov yam ntxwv tseem ceeb ntawm lub diode (D) yog nws cov unidirectional conductivity. Ib tug multimeter yuav tsum ntsuas ib tug tej yam nqi kuj nyob rau hauv lub tom ntej kev taw qhia thiab infinity nyob rau hauv lub rov qab kev taw qhia. Yog hais tias tus nqi tiv thaiv tau ntsuas nyob rau hauv qhov kev taw qhia rov qab, nws qhia tau hais tias lub diode tau puas lawm.
4. Lub transistor (Q) muaj ob lub PN junctions, thiab raws li unidirectional conductivity ntawm PN junction, lub hauv paus tuaj yeem paub qhov txawv yooj yim. Teem lub multimeter mus rau * 1K ohm ntau yam, thiab tom qab ntawd xav tias ib tus pin ntawm transistor yog lub hauv paus. Txuas lub xov tooj dub ntawm lub multimeter thiab txuas lub xov tooj liab mus rau ob tus pins sib cais. Yog tias qhov ntsuas qhov ntsuas ob zaug yog me me (rau pem hauv ntej tsis kam), thiab qhov kev sojntsuam liab txuas nrog tus pin xav tias yog lub hauv paus, thiab qhov kev sojntsuam dub txuas nrog rau ob tus pins feem, nrog rau qhov muaj txiaj ntsig zoo (rov qab ua haujlwm), ces qhov kev xav yog qhov tseeb, thiab tus pin yog lub hauv paus. Qhov kev puas tsuaj rau lub transistor feem ntau yog vim qhib los yog luv luv Circuit Court, thiab txoj kev no tuaj yeem yooj yim txiav txim siab seb lub transistor puas puas.
