Yuav ua li cas siv ib tug multimeter los ntsuas qhov sib thooj keyboards
Qhov sib thooj sib thooj tuaj yeem ntsuas tau siv lub multimeter; Txoj kev ntsuas kuj yog qhov yooj yim heev, tsuas yog kho nws li kev hloov.
Yog li, cia peb nkag siab tias qhov kev sib thooj sib thooj no yog dab tsi tiag.
Qhov sib thooj hloov, raws li lub npe qhia, yog qhov hloov pauv uas tsuas yog ua haujlwm thaum nws "kaw". Qhov sib thooj hloov pauv yuav tsum raug cais raws li txoj haujlwm hloov, thiab qhov sib txawv loj tshaj plaws los ntawm peb cov kev hloov pauv mus txawv tebchaws yog tias qhov sib thooj hloov tuaj yeem ua tiav txoj haujlwm ntsuas txoj haujlwm yam tsis tau kov cov khoom ntsuas.
Nyob rau hauv luv luv, cov ntsiab lus ntawm qhov sib thooj keyboards tseem yog keyboards, tab sis lawv cov qauv kev ua haujlwm txawv. Tam sim no, cov kev sib thooj sib thooj ntawm kev ua lag luam tau kwv yees muab faib ua pawg hauv qab no:
Photoelectric sib thooj hloov: Los ntawm qhov kev xav ntawm lub teeb, thaum muaj kev cuam tshuam thaiv lub teeb tawm, lub cuab yeej yuav tsim lub teeb liab rau lossis tawm.
Hall hom sib thooj hloov: Cov tib neeg yuav tsis paub lub sij hawm Hall, tab sis qhov tseeb, Hall yog ib daim ntawv ntawm Circuit Court uas rhiab heev rau cov khoom sib nqus. Thaum kuaj pom cov khoom sib nqus, lub voj voog yuav hloov, thiab dhau los ntawm kev hloov pauv hloov pauv, cov teeb liab sib xws yuav raug tso tawm:
Capacitive sib thooj hloov: Thaum nws los txog rau capacitive sib thooj keyboards, nws yog ib qho tseem ceeb kom nkag siab txog qhov teeb meem ntawm dielectric tas li. Thaum ib qho khoom hla nruab nrab ntawm ob daim hlau electrode ntawm lub capacitor, lub dielectric tsis tu ncua hloov, uas ua rau lub teeb liab hloov dua siab tshiab thiab tso tawm los ntawm lub voj voog.
Yuav ua li cas siv ib tug multimeter los ntsuas qhov sib thooj keyboards?
Txawm hais tias nws tseem yog qhov hloov pauv, qhov ntsuas ntawm qhov sib thooj hloov pauv no tshwj xeeb me ntsis. Yog tias peb ntsuas nws ncaj qha, peb yuav tsis muaj peev xwm ntsuas tau dab tsi, vim tias qhov sib thooj hloov pauv no yuav tsum muaj lub zog siv hluav taws xob thaum lub sijhawm ua haujlwm ib txwm muaj, ib yam li cov khoom siv hluav taws xob, uas yuav tsum tau txuas nrog lub zog hluav taws xob. Feem ntau ntawm lawv yog DC 24V, uas yog peb txoj kev xaim hluav taws xob.
Yog li, txuas lub hwj chim mus rau qhov sib thooj hloov pauv yog thawj kauj ruam hauv kev ntsuas.
Tom qab muab lub zog rau qhov sib thooj hloov, peb kuj yuav tsum nkag siab txog nws txoj kev xaim sab hauv. Cia peb coj peb-xaim sib thooj hloov ua piv txwv. Cov phooj ywg uas paub qee qhov kev paub txog Circuit Court tau yooj yim pom tau tias qhov qhib-tawm ntawm kev sib txuas sib txuas yog cuam tshuam nrog lub transistor. Thaum ib yam khoom tau hnov hauv lub voj voog loj ntawm qhov sib thooj, qhov kev hloov pauv hauv lub voj voog yuav tshwm sim, uas yuav tsim ib lub voj voog kaw ntawm ob qho tag nrho ntawm cov khoom hauv daim duab hauv qab no, uas yog, 24V fais fab mov yog ntxiv rau ob sab ntawm lub load, uas yog qhov ua tau raws li kev ua haujlwm ntawm qhov sib thooj hloov.
Thaum peb siv lub multimeter los ntsuas qhov voltage ntawm ob sab ntawm lub load, peb tuaj yeem txiav txim siab seb qhov sib thooj ntawm qhov sib txuas yog qhib lossis tawm.
Thov nco ntsoov tias vim yog cov ntawv sib txawv ntawm cov keyboards sib txawv, nws tsis paub meej tias qhov kawg ntawm cov khoom sib koom ua haujlwm zoo lossis tsis zoo nrog cov khoom siv hluav taws xob. Kev ntsuas qhov tseeb yuav tsum tau ua raws li peb cov khoom siv.
