Muaj ntau txoj hauv kev rau xaiv Multimeter
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 digital kuj muaj cov lej digital, ntsuas tus kheej, nyeem ntawv tuav, nyeem ntawv yuam kev, diode nrhiav, lo lus xaiv ntev, IEEE{{1 }} interface lossis RS -232 interface thiab lwm yam haujlwm yuav tsum raug xaiv raws li cov cai tshwj xeeb.
2. Ntau yam thiab ntau yam
DMMs tuaj nyob rau hauv ntau qhov ntau, tab sis qhov ntau yam yog 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, raug 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 yog nyob ntawm tsis yog ntawm nws qhov kev ua yuam kev sib txawv, tab sis kuj nyob ntawm nws qhov yuam kev ruaj khov. Thaum xaiv, nws nyob ntawm ntau npaum li cas qhov kev ruaj ntseg yuam kev thiab linearity yuam kev, thiab seb qhov kev daws teeb meem ua tau raws li qhov yuav tsum tau ua. Yog hais tias qhov dav dav digital multimeter xav tau {{0}}}00{{10}}}5 txog 0.002, tsawg kawg yog 61 tus lej yuav tsum tau ua kom pom; 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. Qhov tseem ceeb nyob ntawm qhov txwv tus nqi tso cai los ntawm cov cuab yeej ntsuas, uas yog, kev tiv thaiv 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 nrog 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, koj yuav tsum xaiv lub tshuab hluav taws xob digital nrog lub ntsuas hluav taws xob tiv thaiv G, 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 txawv ntawm cov lej, thiab nws 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 zog hluav taws xob ntawm lub tshuab hluav taws xob digital feem ntau yog 220V, thiab qee qhov tshiab digital multimeters muaj ntau yam khoom 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.
