Dab tsi ua pov thawj rau kev sim ohm ntau yam ntawm cov khoom siv hauv tsev nrog lub multimeter thaum qee qhov txuas thiab qee qhov tsis yog?
Yog tias koj ntsuas cov khoom siv hluav taws xob xws li hluav taws xob lossis hluav taws xob hluav taws xob, lossis lub rooj teeb uas siv lub teeb pom kev zoo, thaum lub qhov hloov tau qhib, qhov kev tawm tsam ntawm ob qhov kawg ntawm lub ntsuas plug yuav tsum yog li 100 ohms. Thaum ntsuas ob qhov kawg ntawm cov plugs ntawm TVs, tub yees, tshuab ntxhua khaub ncaws, thiab lwm yam., qhov kev tiv thaiv qhov tseem ceeb yog qhov sib txawv, vim hais tias cov plugs ntawm txhua lub tshuab hluav taws xob sib txawv ntawm lawv cov hluav taws xob hauv hluav taws xob, thiab cov khoom siv hluav taws xob sib txawv.
Tom qab tus kheej tau ntsib lub tshuab ntxhua khaub ncaws thaum lub tshuab hloov pauv, qhov kev tiv thaiv ntsuas ntawm ob qhov kawg ntawm lub ntsaws yog li 200 ohms rau lub cev muaj zog hauv lub tshuab ntxhua khaub ncaws.
Qee cov khoom siv hauv tsev xws li LCD TVs thiab cov tub yees muaj cov nqi tiv thaiv ze rau qhov tsis muaj hnub kawg hauv kev siv ib txwm.
Raws li cov saum toj no, siv ib tug multimeter los ntsuas lub on-off ntawm hluav taws xob plug los txiav txim seb cov khoom siv hluav taws xob zoo los yog phem tsis haum rau tag nrho cov khoom siv hluav taws xob, thiab multimeter tsis yog ib tug panacea. Tsuas yog tsim nyog rau qee yam khoom siv hluav taws xob, xws li hluav taws xob hluav taws xob, hluav taws xob, hluav taws xob, hluav taws xob, hluav taws xob soldering irons, lub cev muaj zog coils, incandescent teeb, thiab lwm yam.
Ua ntej ntsuas cov khoom siv hauv tsev, koj yuav tsum nkag siab txog daim duab kos duab ntawm cov khoom siv, tshwj xeeb tshaj yog cov khoom siv hluav taws xob. Qee tus siv lub tshuab hloov pauv kom nqis thiab kho tus taw tes yuav hloov pauv thaum ntsuas nrog lub ntsuas ntsuas, thiab qee qhov siv lub voj voog hloov lossis lwm lub voj voog, thiab tus taw tes yuav tsis tas hloov. Tsis tas li ntawd, lub Circuit Court breaker multimeter yuav tsis muaj qhov taw qhia. Yog li ntawd, ua ntej ntsuas, sib piv cov duab kos lossis qhib cov khoom siv hluav taws xob los xyuas cov qauv hauv Circuit Court, kom tsis txhob muaj kev txiav txim siab.
Txoj kev siv hluav taws xob ntawm ntau yam khoom siv hauv tsev sib txawv, thiab qib hluav taws xob kuj sib txawv, yog li ntsuas tus nqi kuj tseem txawv. Yog tias nws yog lub zog hloov hluav taws xob, nws muaj kev tiv thaiv diode pib sab hauv, yog li qhov ntsuas tsis tuaj yeem ntsuas.
Kev txheeb xyuas ntawm cov khoom me me ruaj khov
1. Kev kuaj xyuas cov capacitors me me hauv qab 10pF Vim tias lub peev xwm ntawm cov capacitors ruaj khov hauv qab 10pF yog qhov tsawg dhau, kev ntsuas nrog lub tshuab hluav taws xob tsuas tuaj yeem kuaj xyuas seb puas muaj cov xau, sab hauv luv luv lossis tawg. Thaum ntsuas, koj tuaj yeem xaiv cov ntaub ntawv tiv thaiv ntawm multimeter, thiab siv ob qhov kev xeem ua rau txuas ob tus pins ntawm lub capacitor arbitrarily, thiab tus nqi kuj yuav tsum yog infinite. Yog tias qhov ntsuas ntsuas tus nqi (tus pointer viav vias mus rau sab xis) yog xoom, nws txhais tau hais tias lub capacitor puas los ntawm kev xau lossis kev puas tsuaj sab hauv.
2. Tshawb xyuas seb lub 10PF-0.01μF tsau capacitor raug them, thiab tom qab ntawd txiav txim seb nws puas zoo lossis phem. Lub multimeter siv hluav taws xob thaiv. Qhov tseem ceeb ntawm ob lub triodes yog ob qho tib si saum toj no 100, thiab yog tias qhov nkag mus tam sim no tseem ceeb dua, 3DG6 thiab lwm hom silicon triodes tuaj yeem siv los tsim cov raj sib xyaw. Kev kuaj liab thiab dub ua rau ntawm lub multimeter yog feem txuas nrog lub emitter e thiab collector c ntawm cov raj sib xyaw. Vim lub amplification nyhuv ntawm composite triode, lub them thiab tso tawm txheej txheem ntawm lub ntsuas capacitor yog amplified, thiab lub pendulum ntawm tus pointer ntawm lub multimeter yog nce, uas yog yooj yim rau kev soj ntsuam. Nws yuav tsum raug sau tseg tias thaum lub sijhawm ua haujlwm, tshwj xeeb tshaj yog thaum ntsuas lub capacitor nrog lub peev xwm me me, nws yog ib qho tsim nyog yuav tsum rov hloov cov pins ntawm lub capacitor nyob rau hauv qhov kev ntsuam xyuas kom kov cov ntsiab lus A thiab B, kom lub viav vias ntawm tus pointer ntawm multimeter. tuaj yeem pom meej.
3. Rau qhov ruaj khov capacitance saum toj no 0.01μF, siv R × 10k block ntawm multimeter los kuaj ncaj qha seb lub capacitor puas muaj cov txheej txheem them thiab seb puas muaj qhov luv luv hauv Circuit Court lossis to, thiab lub peev xwm ntawm lub capacitor tuaj yeem kwv yees raws li qhov amplitude ntawm tus pointer viav vias mus rau sab xis.
