Yuav ua li cas siv multimeter los ntsuas capacitance tuaj yeem ua raws li hauv qab no:
1. Directly ntes nrog capacitor hom
Qee qhov digital multimeters muaj lub luag haujlwm ntawm kev ntsuas lub peev xwm, thiab lawv qhov sib txawv tau muab faib ua tsib theem: 2000p, 20n, 200n, 2 μ, thiab 20 μ. Thaum ntsuas, ob lub pins ntawm lub tso tawm capacitor tuaj yeem muab tso ncaj qha rau hauv Cx qhov (socket) ntawm lub ntsuas ntsuas, thiab cov ntaub ntawv tuaj yeem nyeem tau tom qab xaiv qhov tsim nyog.
000p ntau yam, haum rau ntsuas cov capacitors tsawg dua 2000pF; 20n ntau yam, haum rau ntsuas qhov ntsuas ntawm 2000pF thiab 20nF; 200n ntau yam, haum rau ntsuas qhov ntsuas ntawm 20nF thiab 200nF; 2 μ theem, tsim nyog rau kev ntsuas capacitance ntawm 200nF thiab 2 μ F; 20 μ F yog haum rau ntsuas capacitance ntawm 2 μ F thiab 20 μ F.
Kev paub dhau los tau pom tias qee cov qauv ntawm digital multimeters (xws li DT890B+) muaj qhov yuam kev tseem ceeb thaum ntsuas lub peev xwm me me hauv qab 50pF, thiab ntsuas cov capacitors qis dua 20pF yuav luag tsis muaj nqi siv. Hauv qhov no, cov txheej txheem series tuaj yeem siv los ntsuas qhov ntsuas me me. Txoj kev yog thawj zaug nrhiav lub capacitor nrog lub peev xwm ntawm 220pF, ntsuas nws qhov peev xwm C1 nrog lub tshuab hluav taws xob digital, thiab tom qab ntawd muab cov capacitor me me los ntsuas nrog nws ntsuas nws cov peev xwm C2. Qhov sib txawv ntawm ob (C1-C2) yog lub peev xwm ntawm lub capacitor me me los kuaj. Txoj kev no yog qhov tseeb heev rau kev ntsuas me me ntawm 1-20pF.
2. Tshawb xyuas nrog hom kev tiv thaiv
Kev xyaum tau ua pov thawj tias cov txheej txheem them nqi ntawm cov khoom siv hluav taws xob kuj tuaj yeem raug soj ntsuam siv lub tshuab digital multimeter, uas ua rau muaj kev cuam tshuam txog kev hloov pauv ntawm kev them nqi hluav taws xob hauv cov khoom siv digital. Yog hais tias qhov ntsuas tus nqi ntawm ib lub multimeter yog n zaug ib ob, ces thaum lub sij hawm tus txheej txheem ntawm kev soj ntsuam cov nqi ntawm ib tug capacitor, ib tug ywj siab thiab sequentially nce kev nyeem ntawv yuav pom txhua txhua ob. Raws li cov zaub feature ntawm lub multimeter digital, nws muaj peev xwm txheeb xyuas qhov zoo ntawm capacitors thiab kwv yees qhov loj ntawm lawv lub peev xwm. Cov hauv qab no yog ib txoj hauv kev siv digital multimeter los ntes cov capacitors nyob rau hauv qhov kev tawm tsam, uas yog qhov muaj txiaj ntsig zoo rau cov twj paj nruag uas tsis tau teeb tsa lub peev xwm. Txoj kev no tsim nyog rau kev ntsuas lub peev xwm loj ntawm cov khoom siv hluav taws xob xws li 0.1 μ F mus rau ntau txhiab microfarads.
Teem lub digital multimeter mus rau qhov tsim nyog tsis kam, nrog rau liab thiab dub probes feem kov ob tug ncej ntawm kev sim capacitor Cx. Lub sijhawm no, tus nqi tso tawm yuav maj mam nce los ntawm "000" kom txog thaum lub cim overflow "1" tshwm. Yog tias "000" tshwm sim tas li, nws qhia tau hais tias ib qho luv luv Circuit Court hauv lub capacitor; Yog tias cov dej ntws tawm tsis tu ncua, nws yuav yog vim qhov qhib hluav taws xob nruab nrab ntawm cov ncej sab hauv ntawm lub capacitor, lossis nws yuav yog vim qhov tsis tsim nyog tiv thaiv qib xaiv. Thaum kuaj xyuas electrolytic capacitor, nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias qhov kev sojntsuam liab (zoo them) yuav tsum tau txuas nrog lub davhlau ya nyob twg zoo ntawm lub capacitor, thiab qhov kev sojntsuam dub yuav tsum txuas nrog lub davhlau ya nyob twg tsis zoo ntawm lub capacitor.
