Ob peb lub ntsiab lus thaum xaiv lub digital multimeter
(1) Kev ntseeg tau: tshwj xeeb tshaj yog nyob rau hauv cov xwm txheej hnyav, kev ntseeg siab yog qhov tseem ceeb dua li yav dhau los.
(2) Qhov tseeb: Qhov kev txiav txim siab tseem ceeb hauv kev tsim cov digital multimeters, tshwj xeeb tshaj yog cov uas tau kuaj nws tus kheej los ntawm cov chaw kuaj mob uas muaj ntawv pov thawj thiab luam tawm nrog cov cim ntawm cov chaw kuaj sim xws li UL, CSA, thiab VDE.
(3) Kev daws teeb meem: Kev daws teeb meem, tseem hu ua rhiab heev, yog hais txog qhov tsawg tshaj plaws ntawm chav ntsuas ntawm qhov ntsuas ntsuas ntawm digital multimeter, uas yog, qhov hloov me me ntawm cov teeb liab ntsuas tuaj yeem pom. Piv txwv li: Yog tias qhov kev daws teeb meem ntawm digital multimeter yog 1mV hauv 4V ntau, ces thaum ntsuas 1V teeb liab, koj tuaj yeem pom qhov hloov me me ntawm 1mV. Qhov kev daws teeb meem ntawm digital multimeter feem ntau qhia hauv cov lej lossis cov lus.
Qhov kev daws teeb meem ntawm digital multimeter yog qhov taw qhia tseem ceeb heev. Piv txwv li, yog tias koj xav ntsuas qhov ntev tsawg dua 1 hli, koj yuav tsis siv tus pas ntsuas qhov tsawg tshaj plaws yog centimeters; lossis yog tias qhov kub thiab txias yog 98.6 degree F, ces nws yog qhov zoo los ntsuas nws nrog lub ntsuas kub uas tsuas muaj cov lej cim. Txhawm rau siv nws, koj xav tau tus pas ntsuas kub nrog qhov kev daws teeb meem ntawm 0.1 degree F.
(4) Qhov tseeb: yog hais txog qhov ua yuam kev siab tshaj plaws nyob rau hauv ib puag ncig siv tshwj xeeb. Hauv lwm lo lus, qhov tseeb yog siv los qhia tias ze li cas qhov ntsuas tus nqi ntawm digital multimeter yog rau tus nqi tiag tiag ntawm lub teeb liab ntsuas. Rau digital multimeters, qhov tseeb feem ntau yog qhia raws li feem pua ntawm kev nyeem ntawv. Piv txwv li, qhov tseeb 1% kev nyeem ntawv txhais tau hais tias thaum lub digital multimeter qhia 100.0V, qhov tseeb voltage yuav nyob nruab nrab ntawm 99.0V thiab 1 01.0V. Nyob rau hauv cov lus qhia ntxaws, tej zaum yuav muaj tus nqi tshwj xeeb ntxiv rau qhov tseeb qhov tseeb. Nws lub ntsiab lus yog tus naj npawb ntawm cov lus uas yuav tsum tau ntxiv los hloov txoj cai kawg ntawm qhov tshwm sim *. Hauv qhov piv txwv yav dhau los, qhov tseeb yuav raug suav tias yog ±(1%+2). Yog li ntawd, yog hais tias lub multimeter nyeem 100.0V, qhov tseeb voltage yuav nyob nruab nrab ntawm 98.8V thiab 101.2V. Qhov tseeb ntawm ib qho analog meter (los yog analog multimeter) yog xam raws li qhov yuam kev ntawm tag nrho cov nplai, tsis yog cov ntawv nyeem. Qhov raug raug ntawm analog multimeter yog ± 2% lossis ± 3% ntawm tag nrho cov nplai. Qhov yooj yim qhov tseeb ntawm digital multimeter yog nruab nrab ntawm ±(0.7%+1) thiab ±(0.1%+1) ntawm kev nyeem ntawv, lossis zoo dua.
(5) Ohm Txoj Cai: Ohm Txoj Cai qhia txog kev sib raug zoo ntawm voltage, tam sim no, thiab tsis kam. Kev siv Ohm txoj cai, qhov voltage, tam sim no, thiab kev tiv thaiv ntawm ib lub voj voog tuaj yeem raug xam: voltage=tam sim no × tsis kam. Yog li tsuas yog paub ob qhov tseem ceeb hauv cov qauv tuaj yeem suav tus nqi thib peb. Ib lub tshuab hluav taws xob digital siv Ohm txoj cai los ntsuas thiab tso saib tsis kam, tam sim no, lossis voltage.
(6) Digital thiab analog pointer zaub: Hais txog qhov tseeb thiab kev daws teeb meem, cov duab digital muaj qhov zoo. Tus nqi ntsuas tuaj yeem pom nrog peb lossis ntau tus lej. Analog pointers yog me ntsis qis dua qhov tseeb thiab kev daws teeb meem, thiab peb feem ntau cia siab rau kev kwv yees txoj hauj lwm ntawm tus taw tes kom nyeem ntawv. Ib qho digital multimeter muaj ib daim duab qhia pom cov teeb liab hloov pauv thiab cov qauv zoo li tus taw qhia analog, tab sis nws muaj zog dua thiab txo kev puas tsuaj.
