Voltage rhiab heev ntawm lub multimeter
rhiab heev yog ib qho kev qhia uas sawv cev rau qib uas ib qho cuab yeej teb rau lub zog tsis muaj zog.
Vim lub fact tias lub zog tsav lub ntsuas ntsuas mechanism rau deflect yog npaum li cas los ntawm lub tam sim no nyob rau hauv lub Circuit Court nyob rau hauv lub xeem, yog hais tias tus ntsuas pointer deflects ho thiab siv tsawg zog, nws rhiab heev kuj yuav siab dua.
Lub rhiab heev ntawm ib tug multimeter tuaj yeem muab faib ua peb qhov ntsuas: DC voltage rhiab heev, AC voltage rhiab heev, thiab ntsuas lub taub hau rhiab heev. DC voltage rhiab heev yog lub ntsiab qhia. AC voltage rhiab heev yog feem ntau qis dua DC voltage rhiab heev vim 'meter' Circuit Court tsim yam tseem ceeb. Lawv tau sau rau ntawm lub xov tooj hauv ohms ib volt (Ω / V).
Lub rhiab heev ntawm lub taub hau ' meter ' qhia tau hais tias tag nrho cov nqi tam sim no ntawm lub taub hau 'meter', suav nrog kev ua haujlwm sab hauv thiab linearity ntawm lub taub hau 'meter'. Nws yog lub hauv paus rau kev xam cov meter Circuit Court thiab kuj txiav txim siab voltage rhiab heev ntawm tag nrho cov multimeter; Internal resistance ntawm lub taub hau ' meter ' yog hais txog qhov sib npaug ntawm qhov tseem ceeb ntawm kev hloov pauv ntawm lub 'meter' koob thiab cov pawg sab sauv thiab qis ntawm cov plaub hau; Linearity yog hais txog qhov sib xws ntawm qhov kev siv tam sim no dhau los ntawm lub taub hau 'meter' thiab qhov deflection amplitude ntawm tus 'meter' koob, uas yog lub hauv paus rau kev kos lub dial nplai. Ntawm no, qhov tsom mus rau DC voltage rhiab heev ntawm multimeter.
Thaum ntsuas, Voltmeter txuas nrog rau qhov sib npaug nrog ob lub ntsiab lus los ntsuas. Vim tias qhov muaj nyob hauv qhov tsis kam ntawm Voltmeter, nws yog qhov sib npaug ntawm qhov kev tiv thaiv kev sib txuas ntawm qhov sib npaug ntawm ob lub ntsiab lus kom txo tau tag nrho impedance ntawm ob lub ntsiab lus los ntsuas; Tsis tas li ntawd, nws cov nyhuv shunt ntawm lub voj voog ua rau qhov ntsuas qhov ntsuas hluav taws xob qis dua tus nqi tiag tiag. Yog li ntawd, thaum ntsuas voltage, nws yuav tsum tau hais tias lub multimeter muaj ib tug loj nyob rau hauv tsis kam (xws li rhiab heev Ω / V yuav tsum siab) kom txo tau qhov yuam kev no.
Piv txwv li, yog tias DC voltage ntau ntawm MF30 multimeter yog 0-1-5-25-100-500V thiab lub dial cim nrog 20000 Ω / V, sab hauv tsis kam ntawm 1V ntau yog 20k Ω xl=20k Ω; Kev tiv thaiv sab hauv hauv 5V ntau yam yog 20k Ω x 5=100k Ω, thiab lwm yam.
Cov lus qhia rau xaiv qhov rhiab heev ntawm multimeter:
1) Yog hais tias ob lub multimeters muaj qhov sib txawv tab sis qhov sib txawv voltage rhiab heev, ib qho uas muaj hluav taws xob ntau dua rhiab heev yuav muaj qhov ntsuas me me yuam kev thaum ntsuas tib lub zog sab hauv lub zog hluav taws xob sib cais.
2) Rau tib lub multimeter, qhov siab dua qhov voltage ntau dua, qhov ntau dua qhov kev tiv thaiv sab hauv, thiab qhov me me qhov ntsuas qhov yuam kev tshwm sim.
Txhawm rau txo qhov kev ua yuam kev hauv kev ntsuas siab sab hauv lub zog hluav taws xob hluav taws xob, nws yog qee zaum zoo dua los xaiv qhov ntau dua qhov hluav taws xob los ua kom lub zog sab hauv ntawm multimeter. Tau kawg, qhov ntau yuav tsum tsis txhob siab dhau kom tsis txhob nce kev nyeem ntawv yuam kev vim yog lub kaum sab xis me me ntawm tus taw tes thaum ntsuas qhov tsis tshua muaj hluav taws xob. Rau cov khoom siv hluav taws xob tsis tshua muaj hluav taws xob (xws li 220V AC lub zog hluav taws xob), ib qho khoom siv hluav taws xob uas muaj hluav taws xob qis dua tuaj yeem xaiv rau kev ntsuas. Nyob rau hauv lwm yam lus, lub siab rhiab heev multimeter yog haum rau kev ntsuas hluav taws xob, thaum lub siab rhiab heev multimeter yog tsim rau kev ntsuas hluav taws xob.
3) Thaum qhov kev tiv thaiv sab hauv ntawm qhov hluav taws xob ntau ntawm multimeter yog ntau dua 100 npaug tshaj qhov kev tiv thaiv sab hauv ntawm cov khoom siv hluav taws xob kuaj, tsis tas yuav xav txog qhov cuam tshuam ntawm lub tshuab hluav taws xob ntawm qhov ntsuas hluav taws xob.
