Kev ntsuas thiab ceev faj rau cov qib Multimeter Capacitance
Capacitance (los yog capacitance, Capacitance) yog hais txog tus nqi ntawm cov nqi khaws cia ntawm qhov muaj peev xwm sib txawv; denoted li C, lub thoob ntiaj teb unit yog tus farad (F), characterizing lub capacitor lub peev xwm los tuav ib tug nqi.
1 Farad (F)=1000 millifarads (mF)=1, 000, 000 microfarads (μF)
1 microfarad (μF)=1000 nanofarad (nF)=1000000 picofarad (pF)
Yuav ua li cas los txiav txim qhov capacitance ntawm qhov zoo thiab qhov phem?
Nrog lub pointer multimeter ohm iav (iav nrog kev hloov kho capacitance), thawj lub capacitor tso tawm, thiab tom qab ntawd ob lub cwj mem kov lub capacitor ob tus pins, lub sijhawm no tus taw tes lub rooj yuav viav vias sai thiab nrawm rov qab mus rau qhov chaw pib, thiab tig kov. tus pointer yuav viav vias mus rau qhov chaw deb dua thiab tig rov qab mus rau qhov qub qub. Yog hais tias lub pointer swings rov qab mus rau qhov qub txoj hauj lwm uas lub capacitor yog ib tug to (loj-capacity electrolytic capacitors muaj ib tug me ntsis to yog li qub). Yog hais tias tus pointer tsis txav uas yog lub capacitor Circuit Court (muaj peev xwm tsawg dhau, xws li ob peb PF tsis tuaj yeem ntsuas tau, Kuv siv 10K iav yam tsawg kawg nkaus tuaj yeem ntsuas rau 3N3, 4N7 thiab lwm lub peev xwm ntawm me me capacitors).
Kev ntsuas ntawm capacitance leakage method
Ntau tshaj li ib txhiab microfarads ntawm capacitors, tuaj yeem siv thawj zaug R × 10Ω cov ntaub ntawv yuav raug them sai sai, thiab kev kwv yees ua ntej ntawm lub peev xwm, thiab tom qab ntawd hloov mus rau R × 1kΩ cov ntaub ntawv txuas ntxiv mus ntsuas ib ntus, ces tus pointer yuav tsum tsis txhob rov qab, thiab yuav tsum nres ntawm lossis ze rau ntawm ∞, txwv tsis pub muaj qhov tshwm sim ntawm cov dej xau. Rau qee lub kaum ob ntawm microfarads hauv qab lub sijhawm lossis oscillation capacitance (xws li xim TV hloov hluav taws xob oscillation capacitance), cov yam ntxwv xau ntawm nws cov kev xav tau siab heev, tsuav yog siv tsis tau me ntsis, lub sijhawm no hauv R × 1kΩ cov ntaub ntawv tom qab them nyiaj thiab hloov mus rau R × 10kΩ cov ntaub ntawv txuas ntxiv mus ntsuas, thiab tib rab koob yuav tsum tau nres ntawm ∞ thiab yuav tsum tsis txhob rov qab.
