Dab tsi yog qhov teeb meem nrog cov digital multimeter's diode iav ntsuas thiab LED teeb hlaws tsis teeb?
Tej zaum ntau tus neeg muaj kev tsis ntseeg li ntawd. Thaum lub teeb ci LED txuas nrog lub zog hluav taws xob, nws yog qhov pom tseeb zoo, tab sis vim li cas thaum siv cov diode ntau ntawm cov multimeter los ntsuas, qee qhov teeb pom kev zoo, thiab qee qhov tsis teeb. Vim li cas?
Lub zog ua haujlwm ntawm LED teeb hlaws rau lub teeb pom kev dawb yog qhov siab, feem ntau nyob ib puag ncig 3V, thiab ib tus neeg LED teeb hlaws sib txawv, qee qhov qis thiab qee qhov siab, thiab qhov ua haujlwm voltage feem ntau yog 2.6V thiab 3.2V.
Lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm cov ntaub ntawv diode ntawm digital multimeter yog siv qhov chaw tam sim no nrog cov zis ntawm 1mA los ntsuas lub diode. Qhov tsis muaj hluav taws xob tso zis hluav taws xob tsis tu ncua ntawm qhov tam sim no yog kwv yees li 2.8V±0.2V, uas yog, qhov siab tshaj plaws tso zis hluav taws xob ntawm cov ntaub ntawv diode ntawm multimeter tsuas yog 2.8V±0.2V Thaum lub conduction voltage ntawm lub ntsuas LED teeb hlaws yog loj thiab tshaj qhov siab tshaj plaws tso zis voltage ntawm lub multimeter diode, LED teeb hlaws yuav tsis teeb.
Qee cov leds yog 6v, thiab thaum ntsuas nrog lub multimeter, lawv yuav tsis teeb. Nws tuaj yeem txhim kho qhov ntsuas hluav taws xob, lossis koj tuaj yeem ua lossis yuav cov khoom siv hluav taws xob tas li tam sim no, uas tuaj yeem ntsuas 1.8v--300v teeb hlaws lossis lub teeb strips
Tej zaum ntau tus neeg muaj kev tsis ntseeg li ntawd. Thaum lub teeb ci LED txuas nrog lub zog hluav taws xob, nws yog qhov pom tseeb zoo, tab sis vim li cas thaum siv cov diode ntau ntawm cov multimeter los ntsuas, qee qhov teeb pom kev zoo, thiab qee qhov tsis teeb. Vim li cas?
Lub zog ua haujlwm ntawm LED teeb hlaws rau lub teeb pom kev dawb yog qhov siab, feem ntau nyob ib puag ncig 3V, thiab ib tus neeg LED teeb hlaws sib txawv, qee qhov qis thiab qee qhov siab, thiab qhov ua haujlwm voltage feem ntau yog 2.6V thiab 3.2V.
Lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm cov ntaub ntawv diode ntawm digital multimeter yog siv qhov chaw tam sim no nrog cov zis ntawm 1mA los ntsuas lub diode. Qhov tsis muaj hluav taws xob tso zis hluav taws xob tsis tu ncua ntawm qhov tam sim no yog kwv yees li 2.8V±0.2V, uas yog, qhov siab tshaj plaws tso zis hluav taws xob ntawm cov ntaub ntawv diode ntawm multimeter tsuas yog 2.8V±0.2V Thaum lub conduction voltage ntawm lub ntsuas LED teeb hlaws yog loj thiab tshaj qhov siab tshaj plaws tso zis voltage ntawm lub multimeter diode, LED teeb hlaws yuav tsis teeb.
Qee cov leds yog 6v, thiab thaum ntsuas nrog lub multimeter, lawv yuav tsis teeb. Nws tuaj yeem txhim kho qhov ntsuas hluav taws xob, lossis koj tuaj yeem ua lossis yuav cov khoom siv hluav taws xob tas li tam sim no, uas tuaj yeem ntsuas 1.8v--300v teeb hlaws lossis lub teeb strips
Dab tsi yog qhov teeb meem nrog multimeter nF thiab uF dhia rov qab thiab tawm mus
Qhov ntsuas capacitance ntawm lub capacitor tsuas yog nyob ib ncig ntawm lub pob qhov twg nws tsis yooj yim rau siv ob qhov sib txawv capacitance units los txheeb xyuas. Qhov tseeb, lub sijhawm no, lub multimeter zoo ib yam li tib neeg, tsis tuaj yeem ua rau nws lub siab. Tshwj xeeb tshaj yog thaum lub capacitance ntawm lub capacitor koj tab tom sim ntxiv rau qhov sib faib capacitance ntawm multimeter cwj mem ntawm ob peb pF los yog ntau tshaj kaum pF (nrog rau cov faib capacitance ntawm tib neeg lub cev tuav lub multimeter cwj mem) yuav cia li hloov lub node nyob rau hauv lub capacitance unit. yog siv. , qhov tshwm sim no yuav tshwm sim ntau dua.
Qhov ntau ntawm cov multimeter yog dav dhau los ntawm 1uF-999kF (cov multimeters sib txawv muaj ntau qhov sib txawv, raws li qhov xwm txheej tiag tiag, lub sijhawm no peb tab tom tham txog ntau yam universal multimeter), yog li muaj qhov yuam kev, thiab nyob rau hauv txoj kev no uF.nF thiab F , Kev ntaus ntawm uF thiab nF tuaj yeem tsis quav ntsej.
Siv cov ntsuas ntsuas kub ua piv txwv, cov ntsuas kub hauv kev lag luam thiab tib neeg mercury tus pas ntsuas kub, qhov yuam kev ntawm 0.01-0.1 degrees tuaj yeem tsis quav ntsej thaum cov ntsuas kub muaj peev xwm ntsuas ntau pua txhiab tus kub.
