Dab tsi yog lub zog thiab lub luag haujlwm ntawm digital multimeter
Cov multimeter muaj qhov tsis kam, DC voltage, AC voltage, DC tam sim no, AC tam sim no, diode, triode tus nqi, capacitance, thiab ntsuas iav.
Thawj kab (los ntawm sab saum toj mus rau hauv qab) yog cim nrog R los yog Ω, uas qhia txog tus nqi kuj. Thaum qhov hloov pauv nyob rau hauv txoj haujlwm ohm, nyeem cov kab no.
Qhov thib ob bar yog cim nrog ∽ thiab VA, qhia txog AC, DC voltage thiab DC tam sim no tus nqi. Thaum qhov hloov pauv hloov mus rau hauv AC, DC voltage lossis DC tam sim no iav, thiab qhov ntau yog nyob rau ntawm txoj hauj lwm uas tsis yog AC 10V, nyeem cov kab no. Qhov thib peb kab yog cim nrog 10V, uas qhia txog AC voltage tus nqi ntawm 10V. Thaum qhov hloov pauv yog nyob rau hauv AC thiab DC voltage ntau thiab qhov ntau yog ntawm AC 10V, nyeem cov kab ntawv teev lus no. Qhov thib plaub bar, sau npe dB, qhia txog qib suab.
Dab tsi yog cov haujlwm ntawm digital multimeter
General digital multimeters tuaj yeem ntsuas DC tam sim no, DC voltage, AC tam sim no, AC voltage, tsis kam thiab suab qib, thiab lwm yam, thiab qee qhov kuj tuaj yeem ntsuas AC tam sim no, capacitance, inductance thiab qee qhov tsis sib xws ntawm semiconductors. Lub hauv paus ntsiab lus yog siv lub rhiab heev magnetoelectric DC ammeter (microampere meter) ua lub taub hau. Thaum ib tug me me tam sim no hla lub taub hau ' meter ', lub multimeter yuav muaj qhov qhia tam sim no.
Cov multimeter digital tsis tsuas yog siv los ntsuas qhov tsis kam ntawm cov khoom los ntsuas, tab sis kuj tseem siv tau los ntsuas DC voltage thiab AC voltage. Qee qhov multimeters tuaj yeem ntsuas qhov tseem ceeb ntawm cov transistors thiab lub peev xwm ntawm capacitors. Nws yog ib qho ntawm cov kev txawj ntse tshaj plaws ntawm kev siv tshuab hluav taws xob kom ua tau zoo hauv kev siv multimeters. Multimeters muaj xws li pointer multimeters thiab digital multimeters. Lub pointer multimeter yog ib qho kev ntsuas ntau yam nrog lub ntsuas lub taub hau raws li cov ntsiab lus tseem ceeb, thiab ntsuas tus nqi yog nyeem los ntawm tus pointer ntawm lub taub hau meter. Qhov ntsuas tus nqi ntawm digital multimeter yog ncaj qha tso tawm hauv daim ntawv digital los ntawm cov kua siv lead ua kua, uas yooj yim nyeem, thiab qee qhov kuj muaj lub suab nrov ua haujlwm. Multimeter yog ib lub 'meter' uas sib txuas lub voltmeter, ammeter thiab ohmmeter hauv ib lub taub hau.
DC tam sim no ntau yam ntawm lub multimeter yog ntau yam DC voltmeter. Qhov hluav taws xob ntau tuaj yeem nthuav dav los ntawm kev sib txuas ntawm qhov hluav taws xob kaw hluav taws xob faib hluav taws xob sib txuas nrog lub taub hau 'meter'. Cov ntaub ntawv DC voltage ntawm multimeter yog ntau yam DC voltmeter. Txuas lub voltage faib resistor nyob rau hauv series nrog lub 'meter' lub taub hau yuav nthuav nws voltage ntau yam. Qhov sib txawv voltage faib cov resistors muaj qhov sib txawv ntsuas qhov sib txawv. Lub taub hau ntawm lub multimeter yog ib qho kev ntsuas magnetoelectric system, uas tsuas tuaj yeem dhau los ntawm qhov ncaj qha tam sim no, thiab siv cov diodes hloov pauv mus rau qhov tam sim no ncaj qha, yog li paub txog qhov ntsuas ntawm kev hloov tam sim no.
