Cov yam ntxwv ntawm multimeters thiab dual -}} impedance digital multivers
Cov qauv yooj yim ntawm cov digital cov digital muaj kev sib txuam yog pom hauv daim duab. Qhov sib xyaw ua ke ob zaug A / D Converter yog lub "lub plawv" ntawm kev hloov pauv ntawm analog rau cov cim digital. Lub pob tw hluav taws xob feem ntau yog suav nrog kev xaiv oscer, raws li cov cim kev tsav tsheb, ib qho cim qhia txog kev coj ua, thiab lwm yam) tsav tsheb.
A / D Converter yog qhov tseem ceeb ntawm cov digital motimeter, uas tuaj yeem tsav tsheb ntawm xor thiab khaws cia electrode noj. Nws lub ntsiab tseem ceeb yog: ib qho khoom siv fais fab tuag, siv cov roj teeb uas muaj kev sib cav sib ceg, thiab siv cov hloov hluav taws xob sab hauv kom ua tiav kev xoom xaim thiab polarity hloov dua siab tshiab. Qhov tsis zoo yog qhov A / D hloov dua siab yog qeeb, tab sis nws tuaj yeem ua kom tau raws li cov kev xav tau ntawm kev ntsuas hluav taws xob.
Kev paub yooj yim txog impedance
Niaj hnub no, feem ntau ntawm cov neeg muaj kev ua haujlwm digital muag rau kev ntsuas ntsuas, hluav taws xob, thiab ntau dua li 1 megaohm. Cias muab, thaum DMM ntsuas ntsuas qhov Circuit Court, nws yuav luag tsis cuam tshuam rau kev ua haujlwm ntawm Circuit Court. Thiab qhov no yog raws nraim li qhov feem ntau ntawm cov ntsuas yuav tsum tau, tshwj xeeb tshaj yog rau cov hluav taws xob hluav taws xob lossis tswj hluav taws xob. Yav dhau los cov kws daws teeb meem cov cuab yeej, xws li cov cuab yeej siv ntau zog thiab cov neeg siv hluav taws xob solenoid valveers, feem ntau muaj qhov 10 kiloohms lossis qis dua. Txawm hais tias cov cuab yeej no tsis cuam tshuam los ntawm cov quav hluav taws xob, lawv tsuas yog tsim nyog rau kev ntsuas hluav taws xob lossis lwm cov xwm txheej uas tsis cuam tshuam dab tsi los yog hloov kho lub ntsej muag.
Ib tug yam ntxwv sib xyaw ua ke ntawm ob txoj kev tawm tswv yim
Los ntawm kev siv dual impedance seev, cov kws tshaj lij tuaj yeem daws tau cov hluav taws xob hauv hluav taws xob, thiab tuaj yeem ntseeg tau tias tsis sib haum xeeb seb puas muaj voltage hauv Circuit Court.
Rau cov ntsuas hluav taws xob hluav taws xob kev ntsuas, nws feem ntau zoo dua los siv cov twj paj nruag siab tshwj tsis yog muaj cov nyom voltages tam sim no.
In Fluke114, 116, and 117DMM, there is a significant impedance in the commonly used Vac and Vdc switch positions of the instrument, which can be used for troubleshooting tasks in most cases, especially for sensitive electronic loads. Lub impedance qis ua haujlwm ntawm fluke yog hu ua auto {}} v /60 v /60 v / LEZ. Ntawm lawv, pib- v sawv daws kev ntsuas hluav taws xob, thiab xaiv cov kev ntsuas kom raug thiab ntau yam los tso cov ntaub ntawv kom raug. Lock sawv cev rau cov impedance qis (z). Qhov kev ua tau zoo no yog cov lus qhia tsis zoo rau kev sim ua kom muaj kev nyeem yuam kev los ntawm kev txiav txim siab ntawm kev txiav txim siab lossis tsis muaj feem ntawm voltage. Thaum muaj kev ua xyem xyav txog kev nyeem ntawv (tejzaum teb tau vim yog cov hluav taws xob tsis sib xws) lossis thaum ntsuas qhov chaw ntawm hluav taws xob, qhov pib v / LEZ hloov txoj hauj lwm ntawm DMM tuaj yeem siv tau.
