Dab tsi yog vim li cas vim li cas tus nqi tsis kam ntawm 5-xim nplhaib resistor tsis tuaj yeem ntsuas thaum ntsuas nrog multimeter?
Ua ntej, koj yuav tsum txiav txim siab qhov nominal tsis kam ntawm koj tus resistor. Koj yuav tsum paub tias cov resistors feem ntau yuav muaj li ntawm ob peb feem kaum ntawm ohms mus rau kaum ntawm megaohms (ib megabyte sib npaug ib lab ohms). Ua ntej txiav txim siab tus nqi nominal tsis kam, thiab tom qab ntawd xaiv qhov ntau ntawm multimeter. Yog tias nws yog lub ntsuas ntsuas digital, yog tias qhov kev tiv thaiv siab tshaj qhov ntau, yuav tsis muaj kev nyeem ntawv (pom zoo li infinity). Yog hais tias tus analog multimeter tshaj qhov ntau dhau lawm, tus pointer tsis tuaj yeem viav vias, lossis tsuas yog txav me ntsis. Tsuas yog thaum qhov ntau ntau dua qhov kev tiv thaiv ntawm cov resistor raug ntsuas, kev nyeem ntawv tuaj yeem tau txais.
Siv koj lub multimeter los ntsuas qhov tsis kam. Nws yog qhov zoo tshaj plaws los xaiv qhov kev ua haujlwm siab ua ntej thiab tom qab ntawd xaiv txoj hauj lwm los ntawm qhov muaj peev xwm ua haujlwm siab mus rau qhov qis-kuj ntau yam los txhim kho qhov tseeb ntawm kev nyeem ntawv tsis kam. Qee cov khoom ua haujlwm siab muaj qhov tsis kam tiv thaiv qis txij li ob peb puas K mus rau ntau txhiab K, thiab kev nyeem ntawv qis tsis tuaj yeem qhia tus nqi tiv thaiv. Qee cov resistors tuaj yeem siv tau. Yog tias tus nqi tiv thaiv tsis tuaj yeem txiav txim siab ntawm qib siab tiv thaiv, lub resistor siv tsis tau. rau siv.
Kuv siv digital multimeter, thiab qhov kev tiv thaiv tsis tuaj yeem ntsuas nyob rau hauv hom on-off, yam tsawg kawg tsis raug. Yog tias koj siv 2M ohm teeb tsa thiab tsis muaj lus teb thaum ntsuas, nws txhais tau tias tus resistor yog qhib Circuit Court, uas yog, nws tawg. Hloov nws nrog tus tshiab!
Lub tsib-xim nplhaib resistor tsis tuaj yeem ntsuas tus nqi ntawm cov resistor. Tsuas muaj ob txoj hauv kev. Ib qho yog tias lub 'meter' tsis zoo. Tab sis tus resistor yog qhib Circuit Court (infinity)!
Ua kom muaj zog, tsis ruaj tsis khov, thiab qhib Circuit Court kuj yog qhov ua txhaum ntawm cov resistors.
Digital multimeter los ntsuas qhov zoo ntawm capacitor
Thaum siv lub tshuab hluav taws xob digital, tig nws mus rau qhov chaw muaj peev xwm thiab siv qhov ntsuas qhov ntsuas qhov ntsuas, thiab tig mus rau qhov chaw 200uf. Tsuas yog los ntawm kev siv qhov ntau no koj tuaj yeem ntsuas cov ntaub ntawv raug. Vim tias nws tsis yog electrolytic capacitor, tsis muaj qhov sib txawv ntawm cov ncej zoo thiab tsis zoo. Thaum ntsuas, cov duab digital pib nrog tus nqi me me. Tus lej pib nce zuj zus. Hloov tus cwj mem ntsuas capacitance thiab rov ntsuas qhov kev nyeem ntawv ntawm cov ntsuas digital. Nws yog ib txwm maj mam txo los ntawm tus nqi siab mus rau tus nqi me me. Txwv tsis pub, thaum qhov kev nyeem ncaj qha nres ntawm ib qho nqi, nws yog ib qho kev puas tsuaj. Tom qab ntawd siv 200 ohm resistor. Yog tias qhov ntsuas ntsuas yog xoom lossis tus nqi tiv thaiv tsawg heev, nws yog lub xeev tawg. Thaum siv cov qib capacitance, thov ua raws li cov qauv kev sib txuas ntawm cov hlau lead hauv daim duab hauv qab no rau kev siv thiab ntsuas.
Siv qhov kev teeb tsa capacitance ntawm multimeter los ntsuas lub peev xwm thiab pom tias qhov yuam kev loj npaum li cas nrog lub peev xwm nominal? Hauv 20% yog suav tias yog qhov qub.
Tom qab ntawd siv qhov kev teeb tsa tsis kam los ntsuas qhov tsis kam ntawm lub capacitor. Lub sijhawm yuav ntev dua vim tias muaj cov txheej txheem them nqi, feem ntau nyob rau hauv 10-30 vib nas this. Thaum cov ntaub ntawv ruaj khov, nws tuaj yeem suav tau tias qhov ntsuas tau ua tiav. Qhov tshwm sim yuav tsum yog infinite, txwv tsis pub lub capacitor yog to.
Txawm li cas los xij, qhov kev sim no tsis tiav vim qhov voltage ntawm multimeter tsawg dhau thiab tsis tuaj yeem ntsuas qhov xau ntawm lub capacitor nyob rau hauv high voltage. Muaj ntau lub capacitors puas lawm vim high-voltage breakdown thiab to.
