Cov txheej txheem kev khiav hauj lwm kom ntxaws rau kev ntsuas kev tiv thaiv siv Multimete
Lub hauv paus ntsiab lus ntawm kev txheeb xyuas qhov tsis kam yog qhov sib txawv ntawm digital multimeter thiab pointer multimeter. Lub pointer multimeter muaj ib hom header tam sim no, thaum lub digital multimeter muaj voltage hom header. Ntxiv mus, thaum lub pointer multimeter pom qhov tsis kam, qhov kev sojntsuam dub tso tawm qhov hluav taws xob zoo thiab qhov kev sojntsuam liab tawm qhov tsis zoo. Txawm li cas los xij, thaum lub digital multimeter sojntsuam pom qhov tsis kam, qhov polarity ntawm cov zis hluav taws xob yog qhov txawv ntawm qhov pointer multimeter.
Los ntawm daim duab, nws tuaj yeem pom tau tias thaum ntsuas qhov tsis kam nrog lub ntsuas ntsuas, txawm tias nws yog pointer multimeter lossis digital multimeter: ob qho tib si sib npaug rau lub roj teeb txuas nrog cov resistor thiab tom qab ntawd txuas nrog ntsuas ntsuas Rx sab nraum multimeter. Nyob rau hauv lub internal Circuit Court ntawm ib tug multimeter, ib tug pointer hom multimeter siv qhov kev hloov nyob rau hauv tam sim no tom qab series kev twb kev txuas los tso saib tus nqi kuj nyob rau hauv lub ammeter lub taub hau; Ib qho digital multimeter xa cov hluav taws xob poob thoob plaws nws lub zog sab hauv mus rau lub taub hau ntsuas, uas qhia cov ntaub ntawv.
Qhov tshwm sim peb pom yog qhov tseeb tus naj npawb tsim los ntawm qhov hluav taws xob poob lossis tam sim no hla nws sab hauv voltage divider resistor.
Hauv lwm lo lus, thaum ntsuas qhov tsis kam nrog lub multimeter, nws siv nws cov roj teeb sab hauv thiab tsis kam ua ib lub voj voog nrog rau sab nraud. Tam sim no nyob rau hauv Circuit Court yog muab los ntawm lub roj teeb nyob rau hauv lub multimeter. Vim li no, thaum siv multimeter los kuaj qhov tsis kam, qhov ntsuas tsis kam lossis Circuit Court tsis tuaj yeem ua haujlwm nrog lub zog, txwv tsis pub ntsuas qhov yuam kev yuav tshwm sim, thiab qhov tseem ceeb tshaj, muaj peev xwm ua kom puas lub multimeter lossis ntsuas Circuit Court. Vim tias yuav muaj kev cuam tshuam tsis sib xws thiab qhov tshwm sim tsis tau tshwm sim ntawm ob lub voj voog.
Raws li qhov loj ntawm qhov ntsuas tsis kam, qhov ntau ntawm ib qho multimeter rau kev ntsuas kev tiv thaiv feem ntau muab faib ua plaub.
Qee qhov multimeters tuaj yeem muab faib ua 5 thaj chaw, xws li 200 Ω, 2000 Ω, 20k Ω, 200K Ω, thiab 2M Ω.
Thaum qhov ntsuas tsis kam yog siab tshaj qhov siab tshaj ntawm qhov ntau, nws yuav tso saib "1.1". Lub sijhawm no, peb tuaj yeem nthuav dav thiab ua qhov kev xeem. Kom txog rau thaum nws muaj peev xwm tso saib nyeem ntawv. Thaum nyob rau hauv 200 Ω kuj ntau yam, lub multimeter muaj qhov raug siab thiab tuaj yeem pom qhov hloov pauv ntawm 0.1 Ω. Rau beginners, chav tsev ntawm kuj yog raws li nram no:
1M Ω=1000000=10OK Ω.
Piv txwv li, nyob rau hauv 20K Ω tsis kam ntau, thaum cov ntaub ntawv tshawb pom yog 5.6, nws txhais tau tias tam sim no kuaj pom tsis kam yog 5.6K Ω, uas yog sib npaug rau 5600 Ω.
Cov kauj ruam ua haujlwm tshwj xeeb yog raws li hauv qab no.
1. Rub lub multimeter mus rau qhov kev tiv thaiv ntau yam thiab kwv yees tus nqi raws li qhov ntsuas tsis kam, uas tuaj yeem nyob ntawm 200 Ω txog 2M Ω.
2. luv Circuit Court lub multimeter sojntsuam, thiab nyob rau hauv ib txwm muaj xwm txheej, nws yuav tso saib nyob ib ncig ntawm 0.5 Ω nyob rau hauv lub 200 Ω kuj ntau yam. Qee cov multimeters siab heev tuaj yeem txiav xoom thaum kuaj pom qhov tsis kam, thiab thaum luv luv circuiting qhov kev sojntsuam, nws yuav tso saib 0.0 Ω. Qhov no yog qhov tshwm sim ib txwm muaj, qhia txog kev tiv thaiv kev tiv thaiv ntawm cov xov hlau sab hauv thiab sab nraud ntawm multimeter thiab lub qhov (socket).
3. Paub meej tias qhov ntsuas tsis kam lossis Circuit Court tsuas tuaj yeem kuaj tau thaum nws tsis muaj hluav taws xob. Txuas cov kev sojntsuam zoo thiab tsis zoo ntawm multimeter mus rau qhov ntsuas tsis kam thiab nyeem cov ntaub ntawv. Tshem tawm cov ntaub ntawv los ntawm kauj ruam 2 kom tau txais qhov tseeb tus nqi ntawm qhov ntsuas resistor.
Nco ntsoov
Thaum kuaj tsis kam, nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias Circuit Court ntawm lub airbag system tsis tuaj yeem sim siv hom kev tiv thaiv, vim tias qhov hluav taws xob muab los ntawm multimeter tuaj yeem ua rau lub airbag. Txhawm rau kom ntseeg tau tias cov neeg ua haujlwm saib xyuas tsis ua yuam kev hauv kev sim, cov xov hlau ntawm lub hnab ntim khoom muaj kev tiv thaiv nrog cov hlua hlau daj kom paub qhov txawv ntawm lawv, thiab txoj cai no tau ua raws li cov tsheb thoob plaws ntiaj teb.
