Ib txoj hauv kev yooj yim kom paub qhov txawv ntawm xoom thiab hluav taws xob xaim nrog lub multimeter
Feem ntau hais lus, kev txheeb xyuas cov hluav taws xob hluav taws xob hauv xoom kab, hluav taws, tsis siv hluav taws xob ntsuas hluav taws xob tsis tuaj yeem siv, nrog lub tshuab multimeter tuaj yeem paub qhov txawv ntawm qhov hluav taws kub thiab xoom kab? Cov lus teb yog yog, txoj kev yog raws li nram no.
Lub multimeter hloov mus rau AC voltage 250V lossis 500V iav. Cov cwj mem dub txuas nrog cov kav dej sab hauv tsev cov neeg ua haujlwm ntub dej hauv av, av, thiab lwm yam., tus cwj mem liab thiab lub hwj chim qaum lossis lub qhov hluav taws xob qhov hluav taws xob tiv tauj, lub multimeter qhia tau hais tias tus nqi hluav taws xob ntau dua rau cov hluav taws xob hluav taws xob, tus nqi hluav taws xob qis lossis xoom. rau txoj kab xoom.
Muab lub multimeter iav rau ntawm AC voltage 250V iav, ib lub meter stick txuas nrog cov hlau, lwm yam nrog rau phab ntsa lossis hauv av, (yog tias phab ntsa lossis hauv av tshwj xeeb qhuav tuaj yeem ua nrog dej kom ntub dej, yog li ntawd. tias cov nyhuv tseem ceeb dua) multimeter pointer tsis qhia tias kab no yog xoom kab, tus pointer deflection qhia tau hais tias kab no yog firewire. Thaum peb xav paub qhov txawv ntawm qhov hluav taws kub thiab xoom kab thiab ob txhais tes ntawm tsis muaj kev ntsuas cwj mem nyob rau hauv rooj plaub, tsuas yog xav tau ib lub multimeter los ua kom tiav qhov kev xeem, muaj peb txoj hauv kev tau piav qhia hauv qab no:
Thawj txoj kev: yog tias koj tsis muaj tus cwj mem xeem hauv tes tsuas yog lub multimeter, nyob rau hauv cov ntaub ntawv ntawm ib txwm muaj hluav taws xob, koj tuaj yeem siv lub multimeter kom paub qhov txawv ntawm cov hluav taws xob hlau thiab xoom kab. Nrog rau tus cwj mem multimeter txuas nrog cov kab hluav taws xob lossis xoom kab, lwm tus cwj mem hauv av lossis phab ntsa, cov kav hlau hlau, thiab lwm yam, yog tias muaj qhov hluav taws xob (feem ntau ntau dua 20V), yog cov kab hluav taws xob; tsis muaj voltage yog xoom kab.
Qhov thib ob txoj kev: Ua ntej ntawm tag nrho cov, peb yuav tsum to taub lub hauv paus ntsiab lus ntawm kev xeem cwj mem, hluav taws xob cwj mem los ntawm cov hlau pas nrig, neon npuas, carbon tsis kam, thiab hlau cap muaj pes tsawg leeg, neon npuas yog ib tug ntaus ntawv uas muaj peev xwm teeb, ib tug iav pob. ntim nrog cov roj inert, carbon tsis kam voltage hauv 1M ohms lossis ntau dua, lub hau hlau yog tib neeg tes hauv kev sib cuag nrog cov khoom, thaum tib neeg thiab lub hau hlau nyob rau hauv kev sib cuag nrog hluav taws xob, tus cwj mem, tib neeg lub cev, thiab lub ntiaj teb. tsim ib lub voj voog, uas tib neeg thiab lub ntiaj teb nyob nruab nrab ntawm qhov muaj txog li 100PF. Muaj ib tug capacitance ntawm txog 100PF ntawm lub ntiaj teb, lub Circuit Court yog li constituted.
Peb siv multimeter los ntsuas, thiab tsis hais digital lossis pointer multimeter, hauv kev nkag siab ntawm cov khoom siv hluav taws xob dav dav, peb siv 220VAC voltage, piv txwv li, yuav raug hloov kho rau 400VAC multimeter iav, tus cwj mem liab txuas nrog cov kab hluav taws xob. los yog xoom kab, txhais tes kov tus cwj mem dub, lub multimeter yog tias muaj kev nyeem ntawv qhia tias nws yog hluav taws xob; tsis muaj kev nyeem ntawv qhia tias nws yog tus lej xoom.
Txoj kev no yuav tsis ua rau muaj kev phom sij rau tib neeg lub cev, yog vim li cas cov digital multimeter sab hauv tsis kam ntawm 10M ohms, pointer rooj sab hauv tsis kam ntawm 20K ohms / V, yog qhov ntsuas ntawm qhov hluav taws xob 220V, tom qab ntawd cov lus taw qhia ntawm kev tiv thaiv sab hauv. ntawm 20K × 220V=4, 400 ohms, muaj kev nyab xeeb kiag li, vim tias cov pa roj carbon resistor ntawm tus cwj mem sab hauv feem ntau siv 1M ohms.
