Yuav ua li cas siv lub ohms nres ntawm multimeter? Yuav ua li cas siv ib tug multimeter ohmmeter
Muaj ob peb ohm cov kauj ruam: * 1 * 10 * 100, thiab lwm yam. Qhov ntsuas tus nqi yog muab faib los ntawm tus nqi ntawm cov iav xaiv. Xws li kev xaiv ntawm * 10 iav, qhov ntsuas ntawm qhov kev nyeem ncaj qha ntawm tus lej yog 10, tom qab ntawd tus nqi tiv thaiv tiag tiag yog 100 ohms.
I. Zeroing ua ntej siv.
Qhov thib ob, tsis tuaj yeem raug nqi ntsuas.
Thib peb, xaiv qhov sib npaug tsim nyog.
Thaum siv lub ohmmeter los ntsuas qhov tsis kam, koj yuav tsum xaiv qhov sib npaug tsim nyog, kom tus taw tes qhia tus nqi ze ntawm qhov chaw. Nws yog qhov zoo tshaj kom tsis txhob siv sab laug thib peb ntawm qhov ntsuas, qhov no ntawm qhov ntsuas yog qhov tsis zoo heev.
Plaub, qhov ntsuas ntsuas tsis tuaj yeem muaj cov ceg sib txuas.
Thib tsib, kev ntsuas ntawm electrolytic capacitors, transistors thiab lwm yam polar Cheebtsam ntawm qhov sib npaug kuj, xyuam xim rau cov polarity ntawm ob lub cwj mem.
Rau, yuav tsum tau them sai sai rau kev siv cov multimeter nrog ntau qhov sib txawv Ohm thaiv los ntsuas qhov sib npaug ntawm cov tsis-linear Cheebtsam, vim qhov nruab nrab tsis kam ntawm txhua lub iav thiab tag nrho cov tam sim no sib txawv, yog li ntsuas qhov ntsuas tsis zoo. ib yam. Nyob rau hauv mechanical meters, feem ntau qhov me dua qhov magnification, qhov me me qhov ntsuas tsis kam.
Multimeter nyeem ntawv
Muaj peb qhov ntsuas ntawm lub ntsej muag ntawm multimeter. Ib qho yog linear scale: voltage thiab tam sim no ntsuas siv qhov ntsuas no. Qhov siab tshaj plaws (rightmost) tus nqi ntawm qhov ntsuas yog qhov ntau ntawm qhov voltage thiab tam sim no, uas tuaj yeem nyeem hauv qhov sib npaug. (Tsuas yog AC voltage 10V block yog cais nyob rau hauv pab pawg no.) Sab hauv feem ntau lub voj voog yog logarithmic nplai - lub ntsuas decibel. Lub voj voog sab nraud yog qhov thaiv thaiv, thiab txoj kev nyeem ntawv yog los ntawm sab xis mus rau sab laug. Sab xis yog 0 thiab sab laug yog infinity. Qhov chaw tiv thaiv yog lub hauv paus tsis kam ntawm lub thaiv. Tus nqi tiag tiag yog sib npaug rau qhov kev nyeem saum npoo av uas tau muab faib ua qhov sib npaug.
Kev siv cov multimeter ohmmeter
I. Xaiv tus lej uas tsim nyog. Thaum ntsuas qhov tsis kam nyob rau hauv ohmmeter, yuav tsum xaiv qhov sib npaug tsim nyog kom tus pointer qhia ze rau qhov chaw nruab nrab. Nws yog qhov zoo tshaj kom tsis txhob siv sab laug thib peb ntawm qhov ntsuas, qhov no ntawm qhov ntsuas yog qhov tsis zoo heev.
Qhov thib ob, mus rau xoom ua ntej siv.
Thib peb, tsis tuaj yeem raug nqi ntsuas.
Plaub, qhov ntsuas ntsuas tsis tuaj yeem muaj cov ceg sib txuas.
Thib tsib, kev ntsuas ntawm transistors, electrolytic capacitors thiab lwm yam polar Cheebtsam ntawm qhov sib npaug tsis kam, yuav tsum tau them sai sai rau qhov polarity ntawm ob tus cwj mem.
Rau, nrog ib tug multimeter nrog sib txawv multiplication ntawm lub ohm block los ntsuas qhov sib npaug kuj ntawm non-linear Cheebtsam, qhov ntsuas kuj tsis zoo ib yam. Qhov no yog vim qhov nruab nrab tsis kam thiab tag nrho tam sim no ntawm txhua qhov thaiv yog qhov sib txawv los ntawm cov lus siv tshuab, feem ntau qhov me dua qhov sib npaug, qhov me me ntawm qhov ntsuas tsis kam.
