Vim li cas lub multimeter tsis tuaj yeem ntsuas qhov polarity ntawm alternating tam sim no?
Lub npe hu ua alternating tam sim no txhais tau hais tias nws cov polarity hloov pauv, thiab kev hloov pauv ceev heev. Txawm hais tias nws yog hom pointer lossis ib qho kev tshaj lij digital multimeter, nws tsis tuaj yeem cuam tshuam nws qhov polarity tam sim ntawd. Nws cov polarity yog nyob rau hauv chav tsev Tus naj npawb ntawm cov kev hloov nyob rau hauv lub sij hawm yog hu ua zaus, thiab nws chav tsev yog Hertz, uas yog ib tug lub cev unit muaj npe nyob rau hauv lub cim xeeb ntawm tus naas ej physicist Mr. Hertz. Vim tias qhov polarity ntawm cov khoom siv hluav taws xob hloov pauv hloov pauv, nws tsis tuaj yeem ntsuas nws cov polarity nrog lub tshuab multimeter. Yog tias nws yuav tsum paub qhov polarity ntawm ib lub sijhawm, uas tuaj yeem hais tau tias yog txoj kev yooj yim tshaj plaws ntawm nws cov polarity tam sim no, tshwj xeeb tshaj yog oscilloscope yog ib qho khoom siv hluav taws xob siv los soj ntsuam kev hloov pauv tam sim no lossis ncaj qha tam sim no pulses.
Kev taw qhia ntawm kev hloov pauv tam sim no hloov txhua lub sijhawm, tsis hais polarity. Yog tias koj xav sim cov xaim nyob thiab cov xaim nruab nrab, koj tuaj yeem teeb lub multimeter mus rau qhov siab tshaj plaws AC voltage qhov chaw, tuav lub ntsuas dub nrog ib txhais tes, thiab siv cov hlau kuaj liab los kuaj xyuas cov hlau. Lub pointer uas deflects yog cov nyob hlau, thiab lub point uas tsis deflects yog lub nruab nrab hlau. Tsis tas li ntawd, qee qhov digital multimeters tam sim no muaj qhov ntsuas cwj mem.
Alternating tam sim no yog ib qho tam sim no uas hloov pauv raws li qhov loj thiab kev coj ua. Nws tsis muaj polarity, tsuas yog zaus. Qhov zaus ntawm kev hloov tam sim no hauv kuv lub teb chaws yog 50 Hz, uas txhais tau hais tias tam sim no hloov pauv rov qab 50 zaug hauv ib ob thiab cov kev taw qhia hloov 100 zaug. Qhov teeb meem no nws tus kheej muaj nws tus kheej cov teeb meem.
Yuav ua li cas kho lub buzzer ntawm analog multimeter uas tsis suab
Rau feem ntau siv MF47 pointer multimeter, qee cov qauv muaj kev kuaj pom. Ntawd yog, lub buzzer txuas nrog hauv series hauv Circuit Court. Pass buzzer nrhiav pom; cov iav no nyob ib sab ntawm lub teeb meem hluav taws xob R * 1Ω iav.
Cov iav no feem ntau yog siv los txiav txim sai sai ntawm cov xwm txheej ntawm lub voj voog. Thaum qhov ntsuas yog nyob rau, lub buzzer yuav tam sim ntawd beep. Koj tuaj yeem nkag siab qhov xwm txheej ntawm / tawm ntawm lub voj voog yam tsis tau saib lub koob qhia ntawm lub multimeter nrog koj ob lub qhov muag. Qhov xwm txheej.
Ua ntej tshaj plaws, zoo li hluav taws xob thaiv, lub meter yuav tsum tau xoom. Lub sijhawm no, lub buzzer emits ib lub suab nrov ntev txog 1kHz thaum ua haujlwm, thiab kev ntsuas tuaj yeem ua tiav. Thaum qhov ntsuas tus nqi ntawm qhov ntsuas hluav taws xob qis dua li ntawm 10Ω, lub buzzer yuav suab. Nws yuav tsum tau muab sau tseg ntawm no hais tias lub suab loj ntawm lub buzzer yog inversely proportional rau tus nqi kuj nyob rau hauv lub Circuit Court raug ntsuas (uas yog, qhov ntau dua tus nqi kuj nyob rau hauv lub Circuit Court, lub me me lub suab emitted los ntawm lub buzzer). Nyob rau lub sijhawm no, tus nqi tus lej dial yog kwv yees li R * 3 (tus nqi siv).
Rau hom pointer multimeter, qhov kev puas tsuaj rau lub buzzer feem ntau yog tshwm sim los ntawm tus neeg siv yuam kev teeb tsa lub buzzer txoj hauj lwm los ntsuas AC voltage. Txhawm rau muab cov lus nug kom meej txog kev kho lub buzzer puas.
Muaj ob hom buzzers, ib qho yog piezoelectric ceramic buzzer thiab lwm yam yog electromagnetic buzzer. Multimeters sib txawv siv cov buzzers sib txawv. Lub piezoelectric ceramic buzzer yog ntsuas nrog ib tug multimeter. Nws muaj lub suab, tab sis tus nqi kuj tseem loj heev. Lub electromagnetic buzzer muaj ib qho kev tiv thaiv tus nqi. Thaum nws ntsuas nrog multimeter, nws yuav ua suab nrov.\
