Basic Overview of Digital Multimeters
Digital multimeter (GMM) yog ib qho khoom siv hluav taws xob siv hauv kev ntsuas hluav taws xob. Nws tuaj yeem muaj ntau yam haujlwm tshwj xeeb, tab sis nws txoj haujlwm tseem ceeb yog ntsuas qhov voltage, tsis kam, thiab tam sim no. Digital multimeter, raws li niaj hnub siv ntau lub hom phiaj ntsuas hluav taws xob, feem ntau yog siv hauv kev ntsuas xws li physics, hluav taws xob, thiab hluav taws xob. Basic Overview of Digital Multimeters
Kev daws teeb meem, tus lej ntawm tus lej, cov lus
Qhov kev daws teeb meem yooj yim ntawm digital multimeter yog hais txog qhov zoo ntawm cov ntsuas ntsuas ntsuas. Los ntawm kev nkag siab txog qhov kev daws teeb meem ntawm lub rooj, koj tuaj yeem txiav txim siab seb koj puas tuaj yeem pom cov kev hloov me me hauv cov teeb liab ntsuas. Piv txwv li, yog tias qhov kev daws teeb meem ntawm digital multimeter yog 1mV nyob rau hauv 4V ntau, ces thaum ntsuas 1V teeb liab, koj tuaj yeem pom qhov hloov me me ntawm 1mV (1/1000 volts).
Yog tias koj xav ntsuas qhov ntev tsawg dua 1/4 nti (lossis 1 millimeter), koj yuav tsis siv tus pas ntsuas nrog * me me hauv nti (lossis centimeters). Yog tias qhov kub thiab txias yog 98.6 degree F, ntsuas nrog lub ntsuas kub ntsuas tsuas yog tus lej tsis muaj txiaj ntsig. Koj xav tau tus pas ntsuas kub nrog qhov kev daws teeb meem ntawm 0.1 degree F. Humidity sensor sojntsuam, stainless hlau hluav taws xob cua sov raj PT100 sensor, cam khwb cia txhuas rhaub, cua sov coil kua solenoid valve
Cov lej thiab cov lus yog siv los piav txog qhov kev daws teeb meem ntawm lub rooj. Numeric multimeters raug cais raws li tus lej thiab cov lus uas lawv tuaj yeem pom.
Lub rooj 3 thiab ib nrab tus lej tuaj yeem tso saib peb tus lej tag nrho ntawm 0 mus rau 9, thiab ib nrab tus lej (tsuas yog 1 lossis tsis pom). A 3 thiab ib nrab ntawm cov lus digital tuaj yeem ua tiav qhov kev daws teeb meem ntawm 1999 cov lus. Lub rooj plaub thiab ib nrab tus lej tuaj yeem ua tiav qhov kev daws teeb meem ntawm 19999 cov lus. Basic Overview of Digital Multimeters
Siv cov lus los piav txog qhov kev daws teeb meem ntawm lub rooj digital yog qhov zoo dua li siv cov khoom los piav qhia nws. Qhov kev daws teeb meem ntawm lub rooj 3 thiab ib nrab tus lej tau nce mus rau 3200 lossis 4000 lo lus. Basic Overview of Digital Multimeters
3200 lo lus cov lus digital muab kev daws teeb meem zoo dua rau qee qhov kev ntsuas. Piv txwv li, 1999 lo lus 'meter' tsis tuaj yeem tso saib 0.1V thaum ntsuas qhov hluav taws xob ntau dua 200V. Lub 3200 lo lus digital meter tseem tuaj yeem tso saib 0.1V thaum ntsuas qhov hluav taws xob ntawm 320 volts. Thaum ntsuas qhov ntsuas hluav taws xob siab dua 320V thiab qhov kev daws teeb meem ntawm 0.1V yuav tsum tau siv, yuav tsum siv 20000 lo lus digital meter kim dua.
raug
Qhov tseeb yog hais txog qhov ua yuam kev siab tshaj plaws uas tshwm sim hauv ib puag ncig kev siv tshwj xeeb. Hauv lwm lo lus, qhov tseeb yog siv los qhia
Qhov ze ntawm qhov ntsuas tus nqi ntawm lub digital multimeter thiab tus nqi tiag tiag ntawm cov teeb liab ntsuas.
Rau ib qho digital multimeter, qhov tseeb feem ntau yog qhia raws li feem pua ntawm kev nyeem ntawv. Piv txwv li, kev nyeem ntawv qhov tseeb ntawm 1% txhais tau hais tias thaum lub digital multimeter qhia 100.0V, qhov tseeb voltage yuav nyob nruab nrab ntawm 99.0V thiab 101.0V.
Cov txiaj ntsig tshwj xeeb tuaj yeem raug ntxiv rau qhov tseeb hauv cov lus qhia ntxaws. Nws lub ntsiab lus yog hloov tus naj npawb ntawm cov lus uas yuav tsum tau ntxiv rau sab xis kawg ntawm qhov tso tawm *. Hauv qhov piv txwv dhau los, qhov tseeb yuav raug cim tias ± (1%+2). Yog li, yog tias GMM nyeem ntawv yog 100.0V, qhov tseeb voltage yuav nyob nruab nrab ntawm 98.8V thiab 101.2V.
Qhov tseeb ntawm analog meter yog xam raws li qhov yuam kev ntawm tag nrho cov ntau yam, es tsis yog cov ntawv nyeem. Qhov raug raug ntawm ib qho analog meter yog ± 2% lossis ± 3% ntawm tag nrho cov ntau yam. Qhov tseeb qhov tseeb ntawm ib qho digital multimeter yog nyob nruab nrab ntawm ± (0.7%+1) thiab ± (0.1%+1) ntawm kev nyeem ntawv, lossis ntau dua .
