Yuav ua li cas ntsuas qhov to nrog digital multimeter
Lub roj teeb hauv lub multimeter yog 9v rau 15v. Cov ntaub ntawv tiv thaiv thiab qhov hluav taws xob tsuas tuaj yeem txiav txim siab luv luv, thiab txiav txim siab seb puas muaj qhov xau.
Muaj peb txoj hauv kev los xyuas cov dej xau nrog multimeter:
1. Kev ntsuas hluav taws xob: tua thiab txiav tawm tag nrho cov khoom siv hluav taws xob, siv lub tshuab hluav taws xob multimeter nrog RX10K iav, ib qho kev xeem txhuas txuas nrog cov hlau nyob, thiab lwm qhov kev xeem cov hlau lead yog grounded (los yog faucet). Nws yuav tsum qhia infinite kuj, txwv tsis pub yuav muaj to.
2. Kev ntsuas nyob: Siv lub ntsuas ntsuas nrog 250-volt AC voltage ntau los ntsuas lub plhaub hlau ntawm cov khoom siv hluav taws xob uas xav tias yuav xau. Ib qho kev xeem txhuas txuas nrog lub plhaub, thiab lwm qhov kev xeem cov hlau lead yog hauv av (lossis lub faucet). Thaum tus pointer qhia qhov voltage siab dua 30-50 volts, hloov nws Siv AC 50 volts. Yog tias cov khoom siv hluav taws xob tau lees paub tias siab dua 30 volts, nws yog qhov xau, thiab qis dua 30 volts yog qhov qub. Tom qab ntawd hloov lub xoom thiab hluav taws xob hluav taws xob ntsaws cov xov hlau thiab ntsuas dua kom paub meej.
3. Kev ntsuas hluav taws xob ntawm cov xaim nyob thiab cov xaim nyob nruab nrab (lossis cov xaim nyob thiab cov xaim nyob): tua thiab txiav tawm tag nrho cov khoom siv hluav taws xob, ntsuas qhov kev tiv thaiv ntawm cov hlau nyob thiab cov xaim nruab nrab, nws yuav tsum tsis muaj qhov kawg, txwv tsis pub nws yog to.
Txheeb xyuas txoj kev xau nrog lub digital multimeter raws li hauv qab no:
1. Siv lub ohm iav ntawm lub multimeter (R × 10k lossis R × 1k qib, nyob ntawm qhov muaj peev xwm ntawm lub capacitor), thaum ob qhov kev xeem coj mus kov ob txoj hlua hlau ntawm lub thawv, ob txhais tes ntawm lub 'meter' ua ntej lub ntsej muag clockwise. (mus rau sab xis) viav vias, thiab maj mam rov qab mus rau sab laug ze ntawm ∞ txoj haujlwm, cov txheej txheem no yog cov txheej txheem them nyiaj ntawm lub capacitor.
2. Tus nqi tiv thaiv taw qhia thaum lub koob nyob ruaj khov yog qhov to (R) ntawm lub capacitor. Yog hais tias lub koob saib nyob deb ntawm qhov infinity thaum lub sij hawm ntsuas, nws qhia tau hais tias lub capacitor muaj qhov to loj heev thiab siv tsis tau. Thaum ntsuas qhov to ntawm qee cov capacitors, thaum lub pointer rov qab mus rau qhov chaw infinity, nws swings clockwise dua, uas qhia tau hais tias qhov to ntawm lub capacitor yog hnyav dua. Nws yog feem ntau yuav tsum tau hais tias qhov to-rhiab heev R siab dua los yog sib npaug rau 500k, txwv tsis pub nws yuav siv tsis tau. 3. Nco ntsoov: Rau cov capacitors uas muaj peev xwm tsawg dua 5000pF, lub multimeter tsis tuaj yeem ntsuas nws qhov dej tsis kam.
Multimeters, tseem hu ua multimeters, multimeters, peb-meters, multimeters, thiab lwm yam, yog qhov tseem ceeb ntsuas ntsuas hauv hluav taws xob hluav taws xob thiab lwm lub tuam tsev. Feem ntau, lub hom phiaj tseem ceeb yog ntsuas qhov voltage, tam sim no thiab tsis kam. Multimeters muab faib ua pointer multimeters thiab digital multimeters raws li hom zaub. Nws yog ib qho kev ntsuas ntau yam thiab ntau yam ntsuas. Feem ntau, lub multimeter tuaj yeem ntsuas DC tam sim no, DC voltage, AC tam sim no, AC voltage, tsis kam thiab suab qib, thiab lwm yam, thiab qee qhov kuj tuaj yeem ntsuas AC tam sim no, capacitance, inductance thiab semiconductor. Qee qhov ntsuas (xws li ) thiab lwm yam.
Basic muaj nuj nqi
Lub multimeter tuaj yeem siv tsis tau tsuas yog ntsuas qhov tsis kam ntawm cov khoom ntsuas, tab sis kuj ntsuas qhov DC voltage. Qee qhov multimeters tuaj yeem ntsuas qhov tseem ceeb ntawm cov transistors thiab lub peev xwm ntawm capacitors. Nws yog ib qho ntawm cov kev txawj ntse tshaj plaws ntawm kev siv tshuab hluav taws xob kom ua tau zoo hauv kev siv multimeters.
Multimeters muaj xws li pointer multimeters thiab digital multimeters. Lub pointer multimeter yog ib qho kev ntsuas ntau yam nrog lub ntsuas lub taub hau raws li cov ntsiab lus tseem ceeb, thiab ntsuas tus nqi yog nyeem los ntawm tus pointer ntawm lub taub hau meter. Qhov ntsuas tus nqi ntawm digital multimeter yog ncaj qha tso tawm hauv daim ntawv digital los ntawm cov kua siv lead ua kua, uas yooj yim nyeem, thiab qee qhov kuj muaj lub suab nrov ua haujlwm. Multimeter yog ib lub 'meter' uas sib txuas lub voltmeter, ammeter thiab ohmmeter hauv ib lub taub hau.
Cov ntaub ntawv DC tam sim no ntawm multimeter yog ntau hom DC voltmeter. Qhov hluav taws xob ntau tuaj yeem nthuav dav los ntawm kev sib txuas ntawm qhov hluav taws xob kaw hluav taws xob faib hluav taws xob sib txuas nrog lub taub hau 'meter'. Cov ntaub ntawv DC voltage ntawm multimeter yog ntau yam DC voltmeter. Txuas lub voltage faib resistor nyob rau hauv series nrog lub 'meter' lub taub hau yuav nthuav nws voltage ntau yam. Qhov sib txawv voltage faib cov resistors muaj qhov sib txawv ntsuas qhov sib txawv. Lub 'meter' lub taub hau ntawm lub multimeter yog ib lub tshuab ntsuas magnetoelectric, uas tuaj yeem dhau los ntawm qhov ncaj qha tam sim no, thiab siv diodes los hloov pauv hloov mus rau qhov tam sim no ncaj qha, yog li paub txog qhov ntsuas ntawm kev hloov tam sim no.
