Kev xaiv ntawm digital multimeter feem ntau yog txiav txim siab los ntawm cov hauv qab no
1. Muaj nuj nqi
Ntxiv nrog rau tsib lub luag haujlwm ntawm kev ntsuas AC thiab DC voltage, AC thiab DC tam sim no, thiab kev tiv thaiv, lub tshuab hluav taws xob tam sim no tseem muaj cov lej digital, ntsuas tus kheej, nyeem ntawv tuav, nyeem ntawv yuam kev, nrhiav pom, xaiv lo lus ntev, IEEE{{1 }} interface lossis RS -323 interface thiab lwm yam haujlwm yuav tsum raug xaiv raws li cov cai tshwj xeeb.
2. Ntau yam thiab ntau yam
Ib tug digital multimeter muaj ntau ntau yam, tab sis nws cov theem pib muaj qhov tseeb tshaj plaws. Ntau cov multimeters muaj cov haujlwm tsis siv neeg, tsis tas yuav hloov kho qhov ntau, ua qhov kev ntsuas yooj yim, nyab xeeb thiab nrawm. Kuj tseem muaj ntau cov digital multimeters nrog ntau tshaj qhov muaj peev xwm. Thaum ntsuas tus nqi siab tshaj qhov ntau tab sis tsis tau mus txog qhov siab tshaj plaws, nws tsis tas yuav hloov qhov ntau, yog li txhim kho qhov raug thiab daws teeb meem.
3. Qhov tseeb
Qhov kev ua yuam kev siab tshaj plaws uas tso cai los ntawm digital multimeter nyob ntawm tsis yog ntawm nws qhov kev ua yuam kev tsis sib xws, tab sis kuj nyob ntawm nws qhov yuam kev ruaj khov. Thaum xaiv, nws kuj yog nyob ntawm qhov yuav tsum tau muaj kev ruaj ntseg yuam kev thiab linearity yuam kev, thiab seb qhov kev daws teeb meem puas ua tau raws li qhov yuav tsum tau ua. Yog hais tias qhov dav dav digital multimeter yuav tsum yog {{0}}}00{{10}}}5 txog 0.002, ntawm tsawg kawg yog 61 tus lej yuav tsum tau muab tso tawm; 0.005 txog 0.01, tsawg kawg yog 51 tus lej yuav tsum tau tso tawm; 0.02 txog 0.05, tsawg kawg yog 41 tus lej yuav tsum tau tso tawm; 0.1 Hauv qab no, tsawg kawg 31 tus lej yuav tsum tau muab tso tawm.
4. Input kuj thiab xoom tam sim no
Yog tias qhov kev tawm tsam ntawm cov digital multimeter tsawg dhau thiab xoom tam sim no siab dhau, nws yuav ua rau kev ntsuas yuam kev. Tus yuam sij yog nyob ntawm qhov txwv tus nqi tso cai los ntawm cov cuab yeej ntsuas, uas yog, lub zog sab hauv ntawm lub teeb liab qhov chaw. Thaum lub teeb liab qhov chaw impedance siab, ib qho cuab yeej nrog siab input impedance thiab qis xoom tam sim no yuav tsum raug xaiv kom nws lub hwj chim tuaj yeem tsis quav ntsej.
5. Series hom tsis lees paub piv thiab hom kev tsis lees paub piv piv
Nyob rau hauv lub xub ntiag ntawm ntau yam kev cuam tshuam xws li hluav taws xob teb, magnetic teb thiab ntau yam high-frequency suab nrov los yog ntev-ntev ntsuas, nws yog ib qho yooj yim mus sib tov nyob rau hauv cov teeb meem cuam tshuam thiab ua rau cov nyeem tsis raug. Yog li ntawd, cov twj paj nruag uas muaj cov hlua siab thiab hom kev tsis lees paub qhov sib piv yuav tsum raug xaiv raws li kev siv ib puag ncig, tshwj xeeb tshaj yog thaum ua qhov kev ntsuas siab, ib qho digital multimeter nrog kev tiv thaiv davhlau ya nyob twg G yuav tsum raug xaiv, uas tuaj yeem cuam tshuam ntau hom kev cuam tshuam.
6. Tso daim ntawv thiab lub hwj huam mov
Daim ntawv tso saib ntawm cov digital multimeter tsis txwv rau cov lej, tab sis tseem tuaj yeem tso cov kab kos, ntawv nyeem thiab cov cim, txhawm rau pab txhawb kev soj ntsuam ntawm qhov chaw, kev ua haujlwm thiab kev tswj hwm. Raws li qhov ntev ntawm nws cov khoom siv, nws tuaj yeem muab faib ua plaub pawg: me, nruab nrab, loj thiab super loj.
Lub hwj chim ntawm lub tshuab hluav taws xob digital feem ntau yog 220V, thiab qee qhov tshiab digital multimeters muaj ntau lub zog siv hluav taws xob, uas tuaj yeem nyob nruab nrab ntawm 1100V thiab 240V. Qee qhov me me digital multimeters tuaj yeem siv tau nrog cov roj teeb, thiab qee qhov digital multimeters tuaj yeem siv peb hom: alternating tam sim no, cov roj teeb hauv nickel-cadmium, lossis cov roj teeb sab nraud.
7. Lub sij hawm teb, ntsuas ceev, ntau zaus
Lub sij hawm teb luv luv, qhov zoo dua, tab sis lub sij hawm teb ntawm qee qhov meters yog qhov ntev, thiab kev nyeem ntawv tuaj yeem ruaj khov tom qab lub sijhawm. Kev ntsuas ceev yuav tsum yog nyob ntawm seb nws puas siv nrog rau kev ntsuas qhov system. Yog tias nws siv ua ke, qhov ceev yog qhov tseem ceeb heev, thiab qhov nrawm dua qhov zoo dua. Qhov ntau zaus tuaj yeem xaiv tau raws li qhov xav tau.
8. AC voltage conversion daim ntawv
Kev ntsuas hluav taws xob AC muab faib ua qhov nruab nrab tus nqi hloov pauv, tus nqi siab tshaj qhov hloov pauv thiab muaj txiaj ntsig zoo hloov pauv. Thaum lub waveform distortion yog loj, qhov nruab nrab hloov dua siab tshiab thiab ncov conversion tsis raug, tab sis cov txiaj ntsig zoo hloov pauv tsis tuaj yeem cuam tshuam los ntawm waveform, kom qhov ntsuas tau raug ntau dua.
9. Resistor thaiv
Muaj plaub-xaim system thiab ob-xaim system rau kev ntsuas kev tiv thaiv thaiv. Thaum ua haujlwm me me thiab ntsuas qhov ntsuas siab, yuav tsum tau xaiv qhov kev ntsuas kev ntsuas hluav taws xob nrog plaub-xaim system.
