Taw qhia rau lub multimeter header
Lub taub hau ntawm multimeter yog rhiab heev galvanometer. Lub dial ntawm lub taub hau yog luam tawm nrog ntau yam cim, nplai cov cim thiab qhov tseem ceeb. Lub cim AV-Ω qhia tias ammeter yog multimeter uas tuaj yeem ntsuas tam sim no, voltage thiab tsis kam. Muaj ntau lub nplai kab luam tawm ntawm lub xov tooj, cov uas ib qho cim nrog "Ω" ntawm sab xis yog cov kab hluav taws xob tsis sib haum, sab xis kawg yog xoom, sab laug kawg yog ∞, thiab qhov ntsuas tus nqi faib tsis sib npaug. Lub cim "-" lossis "DC" txhais tau hais tias ncaj qha tam sim no, "~" lossis "AC" txhais tau tias hloov pauv tam sim no, thiab "~" txhais tau tias cov kab sib faib los ntawm AC thiab DC. Ob peb kab ntawm tus lej nyob rau hauv kab kab yog qhov ntsuas qhov tseem ceeb sib raug rau cov haujlwm sib txawv ntawm tus xaiv hloov.
Kuj tseem muaj lub tshuab xoom hloov kho pob qhov rooj ntawm lub ntsuas lub taub hau los kho qhov xoom txoj hauj lwm ntawm tus taw tes ntawm sab laug kawg.
Vim li cas thiaj tsis tuaj yeem ntsuas qhov ntsuas siab AC teeb liab
Nyob rau hauv lub multimeter, qee qhov tsis huv ntawm cov khoom tiv thaiv tau koom nrog hauv kev ntsuas ntawm AC, xws li tus taw tes taw qhia ntawm lub ntsuas ntsuas, DC cais capacitor ntawm lub ntsuas ntsuas digital, thiab lwm yam, thiab nws impedance cuam tshuam nrog zaus thiab waveform. ntawm AC. Yog li ntawd, lub calibration ntawm lub multimeter yog calibrated nrog ib tug tej zaus thiab waveform ntawm alternating tam sim no raws li tus qauv. Yog tias koj siv nws los ntsuas qhov hloov pauv tam sim no ntawm lwm zaus thiab waveforms, cov ntawv nyeem yuav tsis raug.
Kev ceev faj rau kev siv
① Kho qhov "zero point" (tsuas yog rau cov neeg kho tshuab saib xwb). Ua ntej siv lub moos, ua ntej xyuas tias tus pointer nyob ntawm "zero position" ntawm sab laug kawg. Yog tias tsis yog, koj yuav tsum maj mam tig qhov "pib xoom txoj hauj lwm" nyob rau hauv nruab nrab ntawm cov ntaub ntawv nrog ib tug me me ntswj ntsia hlau Kho cov ntsia hlau kom lub pointer taw tes rau xoom txoj hauj lwm.
②Lub multimeter yuav tsum muab tso rau kab rov tav thaum siv (tsuas yog tshuab).
③ Ua ntej qhov kev xeem, txiav txim siab cov ntsiab lus ntsuas, thiab tig lub pob qhov hloov pauv mus rau qhov sib thooj rau qhov ntsuas tau pom, yog li tsis txhob hlawv lub taub hau ntsuas. Yog tias koj tsis paub qhov loj ntawm qhov ntsuas lub cev kom muaj nuj nqis, pib qhov kev xeem nrog ntau yam.
④ Cov ntawv xeem yuav tsum raug muab tso rau hauv cov khoom sib xws.
⑤ Thaum lub sij hawm kuaj, tsis txhob tig lub iav hloov pob qhov rooj arbitrarily.
⑥ Tom qab siv, nco ntsoov kho lub iav hloov pob qhov rooj ntawm lub ntsuas qhov tsis siv mus rau qhov siab tshaj plaws iav ntawm AC voltage.
⑦ Thaum ntsuas DC voltage thiab tam sim no, them sai sai rau qhov zoo thiab qhov tsis zoo ntawm qhov hluav taws xob, cov kev taw qhia ntws ntawm qhov tam sim no, thiab txuas (thaum) nrog kev sim ua kom raug.
