Yuav ua li cas qhia qhov tseeb ntawm cov digital multimeter?
Qhov tseeb ntawm cov digital pultotimeter yog kev sib xyaw ua ke ntawm cov kab ke thiab cov kev ua yuam kev ntawm qhov ntsuas tau. Nws sawv cev℃ntawm kev sib xws ntawm ntsuas tus nqi thiab tus nqi tseeb, thiab tseem muaj kev cuam tshuam qhov loj me ntawm qhov ntsuas qhov yuam kev. Feem ntau hais lus, qhov ntau dua, qhov ntsuas me me, thiab hloov ua lwm yam.
Muaj peb txoj hauv kev los nthuav qhia qhov raug, raws li hauv qab no:
Qhov tseeb =}} ± (% RDG + B% FS) (2.2.1)
Qhov tseeb =} ± (% RDG + N lus) (2.2.2)
Qhov tseeb =} ± (% RDG + B% FS + N lus) (2.2.3.3)
Hauv kev sib npaug (2.2.1), RDG yog tus nqi nyeem (xws li cov khoom siv cais tawm, cov lus qhia txog kev sib tw ua ke Hauv kev sib npaug (2.2.2), n yog qhov hloov pauv hauv qhov kev ua tsis raug cai ntawm tus lej kawg. Yog tias qhov ua yuam kev ntawm n cov lus hloov pauv mus ua ib feem pua ntawm tag nrho cov nplai, nws ua ib kab zauv (2.2.1). Kab zauv (2.2.3) yog qhov tshwj xeeb heev, raws li qee cov tuam ntxhab siv cov lus qhia no, nrog ib ntawm ob nqe lus uas tau sawv cev uas ua yuam kev los ntawm lwm qhov chaw lossis cov haujlwm.
Qhov tseeb ntawm cov digital motimeter yog ntau dua zoo tshaj li ntawm ib tus poalog pointer multimeter. Kev ntsuas qhov tseeb ntsuas ntsuas ntsuas cov qauv ntawm DC, nws tuaj yeem ncav cuag rau 4 thiab ib nrab ntawm, thiab lwm yam, Oi857 thiab Oi859CF multimeters. Qhov tseeb ntawm ib tug sib sau yog ib qho ntsuas tseem ceeb, uas qhia txog kev ua tau zoo thiab kev ua haujlwm ntawm lub multimeter. Ib tug multimeter nrog kev tsis zoo yog qhov nyuaj los qhia nws qhov tseeb
Tus nqi tuaj yeem yooj yim ua rau kev ntsuas tsis raug.
Qhov tseeb yog nyob ntawm tus nqi yuam kev suav nrog kev ntsuas. Qhov tseeb qhov tseeb yog qhia raws li hauv qab no: "% ntawm kev nyeem +% ntawm ntau". Hauv qhov sib npaug no, '% ntawm kev nyeem ntawv' yog sib npaug rau kev nyeem ntawv, thaum '% ntawm ntau qhov' yog cov nqi offset. Cov kev qhia tshwj xeeb no yog tsim rau txhua qhov ntsuas ntau. Yog tias qhov raug ua tsis tau raws li qhov yuav tsum tau daws teeb meem, tom qab ntawv daws teeb meem tsis muaj kev cuam tshuam rau qhov raug. Txawm li cas los xij, koj tseem tuaj yeem siv ntau qhov kev sib tw los saib xyuas cov kev hloov me me thaum lub sijhawm ntsuas. For example, if you want to measure a 10 Vdc signal using a 34401A multimeter with an accuracy of 1 year and a range of 10V, the accuracy is 0.0035+0.0005=10 x (0.0035/100)+10 x (0.0005/100)=+/-0.00040. Yog li ntawd, ntsuas tus nqi yog 10.00000, qhov raug yog * + />, qhov kev nyeem daws yog nruab nrab ntawm 9.996 thiab 10.0004
