9 qhov yuav tsum tau ua rau xaiv tus digital multimeter
(1) Muaj nuj nqi:
Ntxiv rau tsib lub luag haujlwm xws li ntsuas AC thiab DC voltage, AC thiab DC tam sim no, thiab kev tiv thaiv, digital multimeter kuj muaj cov haujlwm xws li kev suav digital, kev kuaj tus kheej, kev nyeem ntawv, kev nyeem ntawv yuam kev, diode nrhiav, lo lus ntev xaiv, IEE{{ 0}} interface lossis RS -232 interface. Thaum siv, nws yuav tsum raug xaiv raws li cov cai tshwj xeeb.
(2) Qhov ntau thiab tsawg:
Ib tug digital multimeter muaj ntau ntau yam, tab sis nws cov theem pib qhov tseeb yog qhov siab tshaj plaws. Ntau cov multimeters muaj qhov tsis siv neeg ntau yam ua haujlwm, uas tshem tawm qhov xav tau los hloov kho qhov ntau, ua kom yooj yim, nyab xeeb, thiab nrawm. Ntau cov digital multimeters kuj muaj peev xwm dhau ntau yam, yog li tsis tas yuav hloov qhov ntau yam thaum ntsuas tus nqi tshaj qhov ntau tab sis tsis tau mus txog qhov siab tshaj plaws, yog li txhim kho qhov tseeb thiab kev daws teeb meem.
(3) Qhov tseeb:
Qhov siab tshaj plaws kev ua yuam kev ntawm digital multimeter 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 kuj nyob ntawm qhov yuav tsum tau ua rau 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 ib tug dav digital multimeter xav tau ib theem ntawm {{{0}}}000 5 rau 0.002, nws yuav tsum muaj tsawg kawg yog 6 thiab ib nrab tus lej tso saib; 0.005-0.01 qib, nrog tsawg kawg yog 5 thiab ib nrab tus lej tso saib; Qib 0.02 txog 0.05, nrog tsawg kawg yog 4 thiab ib nrab tus lej zaub; Hauv qab qib 0.1, yuav tsum muaj tsawg kawg yog 3 thiab ib nrab tus lej tso saib.
(4) Input kuj thiab xoom tam sim no:
Ob qhov kev tawm tswv yim qis thiab siab xoom tam sim no ntawm digital multimeter tuaj yeem ua rau ntsuas qhov yuam kev. Qhov tseem ceeb nyob rau hauv qhov tso cai txwv tus nqi ntawm lub ntsuas ntsuas, uas nyob ntawm qhov kev tiv thaiv sab hauv ntawm lub teeb liab qhov chaw. Thaum lub impedance ntawm lub teeb liab qhov chaw siab, cov twj paj nruag uas muaj siab input impedance thiab qis xoom tam sim no yuav tsum tau xaiv los ua kom lawv qhov cuam tshuam tsis zoo.
(5) Serial hom tsis lees paub piv thiab hom kev tsis lees paub piv piv:
Nyob rau hauv lub xub ntiag ntawm ntau yam cuam tshuam xws li hluav taws xob teb, magnetic teb thiab ntau yam high-frequency suab nrov los yog nyob rau hauv tej thaj chaw deb ntsuas, nws yog ib qho yooj yim mus sib tov cov teeb liab cuam tshuam, ua rau cov nyeem tsis raug. Yog li ntawd, cov twj paj nruag uas muaj siab serial thiab ntau hom kev tsis lees paub yuav tsum raug xaiv raws li qhov chaw siv. Tshwj xeeb tshaj yog rau kev ntsuas siab, digital multimeter nrog kev tiv thaiv davhlau ya nyob twg G yuav tsum raug xaiv, uas tuaj yeem cuam tshuam cov kev cuam tshuam ntau yam.
(6) Zaub hom thiab fais fab mov:
Daim ntawv qhia ntawm lub tshuab hluav taws xob digital tsis txwv rau cov lej, tab sis tuaj yeem tso cov kab kos, ntawv nyeem, thiab cov cim rau ntawm qhov chaw soj ntsuam, kev ua haujlwm, thiab kev tswj hwm. Raws li sab nraud qhov ntev ntawm nws cov khoom siv, nws tuaj yeem muab faib ua plaub pawg: me, nruab nrab, loj, thiab ultra loj.
Lub zog hluav taws xob rau digital multimeters feem ntau yog 220 V, thaum qee hom tshiab digital multimeters muaj lub zog dav dav, uas tuaj yeem nyob ntawm 100 txog 240 V. Qee qhov me me digital multimeters tuaj yeem siv tau nrog roj teeb, thaum lwm tus tuaj yeem siv peb. Txoj kev: AC, cov roj teeb nickel cadmium sab hauv, lossis cov roj teeb sab nraud.
(7) Lub sij hawm teb, ntsuas ceev, ntau zaus:
Lub sij hawm teb luv dua, qhov zoo dua, tab sis qee qhov meters muaj lub sijhawm teb ntev dua thiab yuav tsum tau tos rau lub sijhawm ua ntej kev nyeem ntawv ruaj khov. Kev ntsuas ceev yuav tsum yog nyob ntawm seb nws puas siv nrog rau kev ntsuas qhov system. Thaum siv ua ke, kev ceev yog qhov tseem ceeb, thiab qhov ceev ceev, qhov zoo dua. Xaiv qhov ntau zaus raws li xav tau.
(8) AC voltage conversion daim ntawv:
Kev ntsuas hluav taws xob AC suav nrog kev hloov pauv nruab nrab, kev hloov pauv siab tshaj plaws, thiab kev hloov pauv tus nqi zoo. Thaum lub waveform distortion loj, qhov nruab nrab thiab qhov siab tshaj plaws hloov dua siab tshiab tsis raug, thaum qhov kev hloov pauv tus nqi zoo tsis cuam tshuam los ntawm waveform, ua rau kev ntsuas qhov tseeb dua.
(9) Kev tiv thaiv thaiv txoj kev:
Muaj plaub xaim thiab ob txoj hlua hlau rau kev ntsuas kev tiv thaiv. Thaum ua qhov kev tiv thaiv me me thiab kev ntsuas siab, yuav tsum xaiv qhov kev ntsuas kev tiv thaiv thaiv nrog plaub lub xov hlau.
Nrog rau kev loj hlob ntawm kev sib xyaw ua ke loj thiab cov cuab yeej siv thev naus laus zis, digital multimeters tau maj mam txav mus rau qhov me me, kev siv hluav taws xob tsawg, thiab tus nqi qis. Digital multimeters kuj tau muab faib ua ob hom: portable thiab desktop. Cov khoom siv portable feem ntau muaj nyob rau hauv 3 thiab ib nrab lossis 4 thiab ib nrab txoj haujlwm, nrog rau qhov me me, lub teeb yuag, thiab siv lub zog tsawg, ua rau lawv tsim nyog siv rau hauv kev cob qhia ntau lawm lossis ib puag ncig sab nraum zoov; Lub desktop tuaj yeem ncav cuag 6 thiab ib nrab lossis 7 thiab ib nrab khoom, nrog rau qhov tseeb thiab kev daws teeb meem. Nws siv microprocessors thiab GPIP interface li tus qauv ntsuas thiab ntsuas qhov tseeb hauv metrology, kev tshawb fawb tshawb fawb, thiab cov chaw tsim khoom.
