Siv digital multimeter los ntsuas qhov hluav taws xob siab tshaj plaws
Feem ntau, qhov siab tshaj plaws ntawm DC ntau yam ntawm digital multimeter yog 700V, thiab qhov siab tshaj plaws ntawm AC ntau yog 1000V, uas tsis tuaj yeem ua tau raws li qhov yuav tsum tau ua hauv qee lub sijhawm. Nyob rau lub sijhawm no, txoj kev sib txuas ntawm cov resistors hauv series tuaj yeem siv los nthuav dav, thiaj li ua tiav lub hom phiaj ntawm kev ntsuas high voltage.
Txoj kev yog: txuas lub voltage divider resistor mus rau lub terminals ntawm tus pas ntsuas liab. Yog tias qhov kev nthuav dav ntau yam yog n thiab qhov kev tiv thaiv sab hauv ntawm digital multimeter yog R{{0}}} (feem ntau yog 10MΩ), cov kab txuas txuas hluav taws xob sib faib hluav taws xob Rf=(n{{4}) })R0. Lub sijhawm no, vim tias qhov hluav taws xob siv rau ob qhov kawg ntawm lub ntsuas hluav taws xob tsuas yog 1 / n ntawm qhov ntsuas hluav taws xob, qhov kev nyeem ntawv pom los ntawm lub 'meter' yuav tsum muab sib npaug los ntawm n zaus kom sib npaug ntawm qhov ntsuas hluav taws xob. Piv txwv li, rau ib qho digital multimeter nrog qhov siab tshaj plaws ntawm 1000V, nws sab hauv kuj yog 10MΩ. Txhawm rau nce tus nqi los ntawm 10 npaug, qhov voltage divider resistor ntawm 90MΩ (Ntau dua lossis sib npaug rau 1W) yuav tsum tau txuas nrog hauv series. Yog hais tias qhov kev nyeem ntawv ntawm lub 'meter' yog 400V, qhov ntsuas voltage yog 4000V.
Nws yog ib qho tsim nyog hais tias thaum ntsuas qhov hluav taws xob siab, kev saib xyuas tshwj xeeb yuav tsum tau them rau kev nyab xeeb ntawm tus kheej kom tsis txhob muaj kev kub ntxhov.
