Lub multimeter tsis tso tawm, tab sis lub luv luv tsuas yog qhia
Vim li cas lub multimeter tso saib 0 tom qab lub millivolt ntau luv luv?
Yog hais tias nws tsis yog luv luv, ib tug me me voltage yuav tshwm sim vim induction los yog to tam sim no nyob rau hauv lub 'meter', uas yuav tshwm sim nyob rau hauv mV ntau. Nyob rau hauv ib tug kuj loj ntau yam, vim nws tus kheej voltage divider kuj thiab nws tus kheej voltage tus nqi kuj me me, nws yuav tsis tshwm sim.
Tom qab luv luv Circuit Court, dab tsi yog qhov screen ntawm multimeter ntsuas yog qhov dhau?
Qhov tsis kam ntawm xoom lossis ze rau xoom yog nyob rau. kuj tau.
Tsis tas li ntawd, xyuam xim rau validation. Txawm hais tias lub connector qhib, nws ua tsis tau dua, thiab tom qab ntawd nws txuas dua. Nov yog qhov koj tuaj yeem paub meej.
Lub multimeter stick yog luv, lub multimeter tsis rov qab mus rau xoom
Muaj ntau qhov laj thawj, los ntawm sab nraud mus rau sab hauv, los ntawm qhov yooj yim mus rau qhov nyuaj.
1. Tso cov ntawv xeem, thiab saib seb tus pointer puas tuaj yeem rov qab mus rau xoom ntawm qhov chaw pib ntawm sab laug. Yog tias nws tsis tuaj yeem rov pib dua rau xoom, siv tus ntiv tes ntxig rau Bakelite hloov eccentric pas nrig ntawm lub hauv paus ntawm tus taw tes hloov kho kom rov pib dua rau xoom. Yog tias tsis muaj lus teb rau kev hloov kho, tus pas nrig sab hauv yog tawg. Txhawm rau rov qab mus rau xoom, muab lub 'meter' rau ntawm lub rooj thiab tuav nws ntawm ob sab ntawm lub rooj thiab co sab laug thiab sab xis saib seb lub koob puas cuam tshuam los ntawm sab laug mus rau sab xis. Cov kev cuam tshuam qhia tias txhais tes yog khawb lub dial lossis iav. Sib nrug los kho. Tsis muaj teeb meem, mus rau kauj ruam tom ntej.
2. Kho lub pob qhov rooj zeroing mus rau sab xis mus rau qhov kawg, uas yog qhov siab tshaj plaws zeroing kho. Cov hlau kuaj liab kov lub rooj zaum hlau ntawm lub qhov (socket) kuaj dub, thiab cov hlau lead kuaj dub kov lub rooj hlau ntawm cov hlau kuaj liab, uas yog sib npaug rau ob qhov kev xeem coj mus sib txuas, thiab tuaj yeem rov qab mus rau xoom, qhia tias cov kev xeem coj muaj kev sib cuag tsis zoo, xyuas thiab tshem tawm. Tsis tuaj yeem rov qab mus rau xoom, mus rau kauj ruam tom ntej
3. Tshem lub hau npog ntawm lub thawv roj teeb hauv qab, tshem tawm lub roj teeb 1.5 volt, thiab muab lub multimeter nyob rau hauv DC voltage 2.5 volt ntau yam. Xyuas seb lub roj teeb puas muaj 1.5 volts, yog tias nws tsis txaus, hloov nws. Yog tias qhov hluav taws xob txaus, saib seb puas muaj oxidation thiab xeb ntawm qhov zoo thiab qhov tsis zoo ntawm lub thawv roj teeb, thiab yog tias muaj, tshem nws. Tsis muaj xeb, kho cov shrapnel los txhim kho kev sib cuag nrog lub roj teeb, thiab nruab lub roj teeb. Saib seb nws puas tuaj yeem rov pib dua xoom. Tsis tuaj yeem raug xoom, cov kauj ruam tom ntej.
4. Disassemble lub 'meter' lub thawv thiab saib xyuas qhov chaw tiv tauj daim ntawm xoom-rov qab hlau qhov txhab potentiometer, seb puas muaj kev sib cuag tsis zoo lossis cov xaim tsis kam ntawm potentiometer tawg. tsis muaj teeb meem, kauj ruam tom ntej
5. Tshawb xyuas qhov kev sib cuag ntawm ohmic txoj hauj lwm ntawm qhov hloov pauv, thiab saib seb qhov hloov pauv puas muaj kev sib cuag tsis zoo. Tsis muaj teeb meem, mus rau kauj ruam tom ntej.
6. Saib seb puas yog qhov me me wirewound resistor nyob rau hauv ohm x1 ntau yog hlawv.
Yog thawj tsib kauj ruam yog qhov qub, qhov teeb meem yog theem thib rau. Feem ntau, qee tus neeg tsis mloog, thiab yuam kev teeb tsa lub ohm iav los ntsuas qhov hluav taws xob, thiab hlawv tawm qhov hluav taws xob sab hauv me me, ua rau tsis ua haujlwm rov qab mus rau xoom. Qhov tseeb phim tus resistor nrog tib tus nqi tiv thaiv, thiab qhov txhaum raug tshem tawm.
