Txoj kev rau kev ntsuas hauv - sib txuas nrog cov digital carultivers
Yog tias peb thawj hla txuas nrog REAsoror R1 ntawm V / ω thiab com socket ntawm cov digital tsis kam, ua ntej ntsuas qhov ntsuas hluav taws xob ntawm cov digital multiidance nyob rau hauv uas tsis kam. Raws li ntev li cov nqi tiv thaiv ntawm R1 yog xaiv tsim nyog, nws qhov kev xeem siab tshaj plaws tuaj yeem raug txwv rau hauv qab 0.3V (tsis loj dua 0.3V). Xav txog qhov silicon tubes muaj feem ntau siv ob qho tib si hauv domalically thiab silicon yog tsis quav ntsej (silicon tubs tuaj yeem raug suav tias yog qhib kev ncig). Yog li ntawd, cov qauv no yuav siv tau los ntsuas online tsis kam ntawm cov transistors, uas yog lub load voltage txo txoj kev ntsuas txo cov qauv. Thaum ntsuas qhov ntsuas online siv cov qauv no, yuav tsum muaj qee cov npoo ntawm qhov kev xeem siab tshaj plaws ntawm txhua qhov kev tiv thaiv ntawm 0.35V. Feem ntau, qhov kev ntsuas siab tshaj plaws yuav tsum tsawg dua lossis sib npaug rau 0.3V. Siv lub load voltage txo cov kev ntsuas ntsuas ntsuas ntsuas ntsuas qhov sib txuas sib txuas ntawm online tiv thaiv online.
Piv txwv tias yog ntsuas online tsis kam yog RX, cov zaub muaj nqis ntawm cov digital motimeter yog r, thiab cov ntsuas ntsuas). Pom tseeb, kev sib raug zoo ntawm R, Rx, thiab R1 yog r {{r1. Rx / (r 1+ rx), yog li ntsuas hauv online tiv taus Rx {6} r1. R / (R1-R) tuaj yeem suav los ntawm cov kab zauv no. Tab sis dab tsi yog qhov tsim nyog tus nqi tsim nyog rau kev thauj khoom tiv thaiv R1 hauv txhua qhov tsis kam? Tus kws sau ntawv sim siv cov Circuit Court qhia hauv daim duab 3 los xaiv qhov tsim nyog tiv thaiv tus nqi rau R1. Qhov kev sib txuas tau qhia hauv daim duab 3, thiab cov ntaub ntawv sim tau teev npe nyob hauv rooj txuas nrog. Qhov qhib Circuital voltage ntawm txhua qhov tsis kam ntawm DT830A digital motimeter muab los ntawm cov khw yog 0.65v lossis tsawg dua 0.7v.
It can be seen that the 200 Ω range of the DT830A digital multimeter has a loose requirement for the value range of R1. How can 2k Ω Zhu satisfy the requirement of R1 ≤ 1.76k Ω? Other high ranges have different values for R1. For ease of memory and use, R1=RO (or 0.1R0 ≤ R1 ≤ R0) is generally used for 200 Ω and 2k Ω ranges, while for resistance ranges above 2k Ω, 0.1R0 ≤ R1 ≤ 0.75R is usually used. The value of R1 cannot be too small, otherwise it will affect the measurement range of this resistance range. If R1 is too small, RX>>R1 yuav ua rau cov txiaj ntsig ntawm R thiab R1 zoo heev, uas yuav ua kom cov kev ntsuas yuam kev (vim tias cov digital mottime nws tus kheej muaj qhov yuam kev ntawm ± 1 lo lus).
Yog li ntawd, qhov qis dua ntawm R1 feem ntau yog teem rau 0.1ro. Rau lub dt830a digital motimeter, ntev li r1 yog xaiv voltably raws li cov kev txwv ntau tshaj li ntawm 0.3v, yog li sib tham txog kev ntsuas online. Lub Load Voltage txo cov qauv yog tseem siv tau rau lwm tus qauv ntawm cov qauv digital.
Ceev faj rau kev siv
(1) Tag nrho - teev ntsuas voltage ntawm cov qauv sib txawv ntawm cov qauv sib txawv ntawm cov chaw thau khoom rawing R1 yuav tsum txiav txim siab los ntawm kev sim.
(2) Thaum kev ua haujlwm, thau khoom siv Resistor R1 yuav tsum sib txuas ntawm tus nqi ntawm R1 yuav tsum tau nyeem ntau yam ua ntej ua lag luam online. Nws tsis muaj peev xwm txuas cov kev xeem sib tw hauv parallel nrog Resistor Circuitor ntawm cov digital pallimeter ntawm cov digital pultionance cov hom kev ua haujlwm siab, ua rau ntsuas qhov tsis muaj tseeb. Yog li, qhov kev txiav txim tsis tau thim rov qab
