Multimeter ntsuas tus nqi pem hauv ntej tsis kam ntawm 0 thim rov qab tus nqi dab tsi yog qhov xwm txheej
Mechanical meter, feem ntau hu ua pointer meter, shunts tam sim no los ntawm cov resistor coj cov tam sim no ntws los ntawm lub taub hau pointer mus rau tus nqi ntsuas ntawm lub taub hau, uas tshwm sim tag nrho.
High-voltage diode yuav ua tau ntau tshaj ib tug sub-high voltage diode nyob rau hauv series, kuj yuav muab kaw nyob rau hauv series nyob rau hauv ib lub pob.GTR (triode) hom, yog ib tug ib tug diode, yuav ua los ntawm high voltage cov ntaub ntawv thiab cov txheej txheem. General multimeter tsis tuaj yeem ntsuas.
Pointer meter Rx10k cov ntaub ntawv ntau dua ib qho 10F20 15v roj teeb, siv los ntsuas ntau dua 100k tsis kam.
Ntau qhov hluav taws xob diodes hauv series, yog ib lub raj 1000v, tiv taus qhov hluav taws xob 20000v xav tau 20 hauv series, txhua lub raj hluav taws xob poob 0.7v, 20 yog 14v, yog li feem ntau ntawm cov 'meter' tsuas tuaj yeem tawm ntawm lub zog. diode nyob rau hauv 10000v, siab dua tiv taus voltage yuav tsum tau 'meter' nws tus kheej kuj muaj ib tug ntau dua voltage ua hauj lwm.
Yog tias qhov ntsuas tom ntej yog xoom, qhia tias qhov kev puas tsuaj, tus nqi ib txwm yog 10, 000v rau 7k.(yuav tsum muab piv rau xoom ua ntej, txwv tsis pub lub 'meter' yuav tawg)
Kev ntsuas rov qab ntawm 17.2K, suav txog ib feem peb ntawm lub xov tooj, qhov qub yuav tsum yog qhov tsis muaj kev puas tsuaj, kev puas tsuaj yuav tsum yog xoom tsis kam, tsis pom hauv hom tsuas yog xav tau, lub raj tau tawg, muaj ntau cov charcoal. hmoov tshwm, qhov thim rov qab thaum tus nqi ntawm lub diode yog ib feem ntawm qhov kev puas tsuaj ib nrab ntawm tus nqi ntawm lub diode tsis tawg, lub diode nrog lub ntsuas tapping, tus nqi yuav tsum hloov pauv. Hauv 10K iav, lub diode tsis tawg lossis ib nrab tawg, tus nqi nws tus kheej yog 700Ω, qhov ntsuas ntsuas ntsuas nws tus kheej yuav yog xoom thaum kawg.
Lwm qhov ua tau, lub raj yog qhov qub, qhov kev tiv thaiv hluav taws xob tsis siab, yog li kev kwv yees rau pem hauv ntej ntawm xoom, rov qab ntsuas ntawm tes tsis txhob kov lub cuab yeej, txwv tsis pub nws yuav ntsuas tawm ntawm lub cev tsis kam. Tsis muaj diode, kev ntsuas ncaj qha ntawm tes kuj yog tus nqi no.
Muaj lwm qhov ua tau tsawg dua, tab sis muaj, cov khoom siv germanium diode yuav tshwm sim qhov tshwm sim no, lub raj xa rov qab yog qhov loj dua, kev xa mus tom ntej 10, 000 volts tsawg dua 3K, thim rov qab muaj tus nqi tsis kam, tab sis ntau dua random. , tuaj yeem loj lossis me, tab sis lub raj zoo.
