Basic Outline ntawm Digital Multimeter
Cov txheej txheem tseem ceeb ntawm digital multimeter:
Ib qho digital multimeter (GMM) yog ib qho khoom siv hluav taws xob siv los ntsuas hluav taws xob. Nws tuaj yeem muaj ntau yam haujlwm tshwj xeeb, tab sis lub luag haujlwm tseem ceeb yog los ntsuas qhov voltage, tsis kam thiab tam sim no. Digital multimeters, raws li niaj hnub siv ntau hom kev ntsuas hluav taws xob, feem ntau yog siv hauv kev ntsuas lub cev, hluav taws xob thiab hluav taws xob. Cov txheej txheem tseem ceeb ntawm digital multimeter
Kev daws teeb meem, lej, lo lus
Cov ntsiab lus tseem ceeb ntawm Digital Multimeter Resolution yog hais txog qhov ntsuas qhov ntsuas tau zoo npaum li cas. Los ntawm kev paub txog qhov kev daws teeb meem ntawm ib lub 'meter', koj tuaj yeem qhia tau yog tias koj tuaj yeem pom cov kev hloov me me ntawm cov teeb liab ntsuas. Piv txwv li, yog tias lub tshuab hluav taws xob digital muaj qhov kev daws teeb meem ntawm 1mV tshaj li 4V ntau, koj tuaj yeem pom qhov hloov me me ntawm 1mV (1/1000 ntawm ib lub volt) thaum ntsuas 1V teeb liab.
Yog tias koj ntsuas qhov ntev tsawg dua 1/4 nti (lossis 1 hli), koj yeej yuav tsis siv tus pas ntsuas * me me * units ntawm ntiv tes (lossis centimeters). Yog tias qhov kub thiab txias yog 98.6 degree F, nws tsis muaj txiaj ntsig los ntsuas nws nrog tus ntsuas kub uas tsuas muaj cov lej lej xwb. Koj xav tau tus pas ntsuas kub nrog qhov kev daws teeb meem ntawm 0.1 degree F. Humidity Sensor Probes , , Stainless Steel Heaters PT100 Sensors , , Cast Aluminium Heaters , Cua sov Coils Fluid Solenoid li qub
Tus lej ntawm tus lej thiab cov lus yog dab tsi yog siv los piav txog qhov kev daws teeb meem ntawm lub ntsuas. Digital multi-meters yog categorized los ntawm tus naj npawb ntawm cov khoom thiab cov lus lawv tuaj yeem tso saib.
Ib tus 3½-tus lej ntsuas tuaj yeem tso tawm peb tus lej tag nrho los ntawm 0 mus rau 9, thiab ib nrab-tus lej (1 nkaus xwb lossis tsis pom). Ib tug 3½-tus lej ntsuas tuaj yeem ua tiav qhov kev daws teeb meem ntawm 1999 cov lus. Lub 4 ½-tus lej ntsuas tuaj yeem ua tiav qhov kev daws teeb meem ntawm 19999 cov lus. Basic Outline ntawm Digital Multimeter
Nws yog qhov zoo dua los piav qhia txog kev daws teeb meem ntawm digital multimeter nyob rau hauv cov nqe lus ntawm cov lus tshaj li ntawm cov khoom, thiab qhov kev daws teeb meem ntawm 3½ tus lej digital meter tau nce mus rau 3200 lossis 4000 lo lus. Basic Outline ntawm Digital Multimeter
A 3200 lo lus digital meter muab kev daws teeb meem zoo dua rau qee qhov kev ntsuas. Piv txwv li, nrog rau 1999- lo lus 'meter', koj tsis tuaj yeem ntsuas qhov voltages ntau dua 200 V thiab tseem mus txog 0.1 V. A 3200- lo lus digital meter tuaj yeem ntsuas qhov voltages mus txog 320 V thiab tseem mus txog 0.1 V. Thaum ntsuas qhov ntsuas hluav taws xob siab dua 320 V thiab koj xav tau mus rau qhov kev daws teeb meem ntawm 0.1 V, koj yuav xav siv 20, 000- lo lus ntsuas, uas yog kim dua me ntsis.
Qhov tseeb
Qhov tseeb yog qhov ua yuam kev siab tshaj plaws nyob rau hauv ib puag ncig kev siv tshwj xeeb. Hauv lwm lo lus, qhov tseeb yog siv los qhia
kaw qhov ntsuas tus nqi ntawm ib qho digital multi-meter yog li cas rau tus nqi tiag tiag ntawm cov teeb liab raug ntsuas.
Rau digital multimeters, qhov tseeb feem ntau yog qhia raws li feem pua ntawm kev nyeem ntawv. Piv txwv li, 1% kev nyeem ntawv raug txhais tau hais tias thaum cov khoom siv digital multi-meter yog 100.0V, qhov tseeb voltage yuav nyob nruab nrab ntawm 99.0V thiab 101.0V.
Tej zaum yuav muaj qhov tshwj xeeb ntxiv rau qhov tseeb hauv cov lus qhia ntxaws. Nws txhais tau hais tias tus naj npawb ntawm cov lus yuav tsum tau ntxiv rau kev hloov pauv ntawm txoj cai kawg ntawm cov zaub. Hauv qhov piv txwv dhau los, qhov tseeb yuav raug sau npe ±(1%+2). Yog li, yog GMM nyeem 100.0V, qhov tseeb voltage yuav nyob nruab nrab ntawm 98.8V thiab 101.2V.
Qhov tseeb ntawm ib qho analogue meter yog nyob ntawm qhov yuam kev ntawm tag nrho cov nplai, tsis yog nyob rau hauv cov ntawv nyeem. Qhov tseeb ntawm qhov ntsuas ntsuas analog yog ± 2% lossis ± 3% ntawm tag nrho cov nplai. Tej yam yooj yim qhov tseeb rau digital multi-meters yog nyob nruab nrab ntawm ±(0.7%+1) thiab ±(0.1%+1) ntawm kev nyeem ntawv, los yog zoo dua.
