Cov ntawv lo ntawm cov multimeter tuaj yeem zoo li lawv tus kheej cov lus rau tus neeg tso tseg, thiab txawm tias cov neeg muaj kev paub txog hluav taws xob yuav xav tau kev pab yog tias lawv ntsib cov multimeter uas tsis tau paub dua nrog lub kaw lus luv luv. Hmoov zoo, nws yuav tsis siv sijhawm ntev los txhais cov teeb tsa thiab nkag siab yuav ua li cas nyeem qhov ntsuas, yog li koj tuaj yeem rov qab mus rau koj txoj haujlwm.
Cov kauj ruam
Ntu 1 ntawm 3: Nyeem Dial Settings
Kauj Ruam 1. Ntsuas AC lossis DC voltage
Feem ntau, V qhia txog qhov hluav taws xob, ib txoj kab nqaim qhia txog qhov hloov pauv tam sim no (pom hauv cov tsev hauv tsev), thiab txoj kab ncaj lossis dashed qhia ncaj qha tam sim no (pom hauv cov roj teeb feem ntau). Kab tuaj yeem tshwm tom ntej lossis hla tsab ntawv.
- Lub zog los ntawm cov tsev hauv tsev feem ntau yog AC. Txawm li cas los xij, qee lub cuab yeej tuaj yeem hloov pauv lub zog rau DC los ntawm lub transistor, yog li txheeb xyuas daim ntawv lo hluav taws xob ua ntej koj ntsuas qhov khoom.
- Qhov teeb tsa rau ntsuas qhov hluav taws xob hauv AC Circuit feem ntau yog cim V ~ ua, ACV, los yog VAC.
- Txhawm rau ntsuas qhov hluav taws xob ntawm DC Circuit, teeb lub multimeter rau V–, V --- ua, DCV, los yog VDC.
Kauj Ruam 2. Teeb lub multimeter los ntsuas tam sim no
Vim tias tam sim no ntsuas hauv amperes, nws yog luv A. Xaiv qhov ncaj qha tam sim no lossis hloov tam sim no, qhov twg ntawm qhov Circuit uas koj tab tom sim tau ua. Analog multimeter feem ntau tsis muaj peev xwm ntsuas tam sim no.
- Ib ~, ACA, thiab AAC yog rau kev hloov pauv tam sim no.
- A –, A ---, DCA, thiab ADC yog rau qhov ncaj qha tam sim no.
Kauj Ruam 3. Nrhiav qhov chaw tiv thaiv
Qhov no yog cim los ntawm Greek tsab ntawv omega: Ω. Qhov no yog lub cim siv los qhia txog ohms, chav siv los ntsuas kev tiv thaiv. Ntawm cov ntsuas ntau dua qub, qhov no qee zaum tau sau npe R rau kev tawm tsam xwb.
Kauj Ruam 4. Siv DC+ thiab DC-
Yog tias koj lub multimeter muaj qhov teeb tsa no, khaws nws ntawm DC+ thaum ntsuas qhov ncaj qha tam sim no. Yog tias koj tsis tau nyeem thiab xav tias koj tau txais qhov zoo thiab qhov tsis zoo txuas rau qhov tsis raug, hloov mus rau DC- txhawm rau kho qhov no yam tsis tas yuav kho cov xov hlau.
Kauj Ruam 5. Nkag siab lwm lub cim
Yog tias koj tsis paub meej tias vim li cas thiaj muaj ntau qhov kev teeb tsa rau qhov hluav taws xob, tam sim no, lossis tsis kam, nyeem ntu kev daws teeb meem rau cov ntaub ntawv ntawm kab. Dhau li cov teeb tsa yooj yim no, feem ntau cov ntsuas ntsuas muaj ob peb qhov chaw ntxiv. Yog tias ntau dua ib qho ntawm cov cim no nyob ib sab ntawm ib qho chaw, nws tuaj yeem ua ob qho tib si, lossis koj yuav xav tau xa mus rau phau ntawv qhia.
- ))) lossis cov kab sib xws zoo ib yam ntawm cov kab sib dhos qhia tias "ntsuas txuas mus ntxiv." Ntawm qhov teeb tsa no, lub multimeter yuav beep yog tias ob qhov kev soj ntsuam txuas nrog hluav taws xob.
- Txoj cai-taw qhia xub nrog tus ntoo khaub lig hla nws cim "diode test," rau kev ntsuas seb puas muaj ib txoj hauv kev txuas hluav taws xob.
- Hz sawv cev rau Hertz, chav rau ntsuas qhov zaus ntawm AC circuits.
- –|(– lub cim qhia txog kev teeb tsa lub peev xwm.
Kauj Ruam 6. Nyeem cov ntawv lo chaw nres nkoj
Feem ntau cov ntsuas ntsuas muaj peb qhov chaw nres nkoj lossis qhov. Qee zaum, cov chaw nres nkoj yuav sau nrog cov cim uas phim cov cim piav qhia saum toj no. Yog tias cov cim no tsis meej, xa mus rau phau ntawv qhia no:
- Kev sojntsuam dub ib txwm nkag mus rau hauv qhov chaw nres nkoj uas muaj npe COM rau ib qho (tseem hu ua hauv av. (Lwm qhov kawg ntawm cov hlau lead dub ib txwm txuas rau lub dav hlau tsis zoo.)
- Thaum ntsuas qhov hluav taws xob lossis tiv thaiv, qhov kev sojntsuam liab nkag mus rau hauv qhov chaw nres nkoj nrog daim ntawv me tshaj plaws tam sim no (feem ntau mA rau milliamps).
- Thaum ntsuas tam sim no, qhov kev sojntsuam liab nkag mus rau hauv qhov chaw nres nkoj daim ntawv lo kom tiv taus qhov kev cia siab tam sim no. Feem ntau, qhov chaw nres nkoj rau cov hluav taws xob qis-tam sim no muaj lub fuse ntsuas rau 200 mA ua thaum lub chaw nres nkoj siab-tam sim no tau ntsuas rau 10A.
Ntu 2 ntawm 3: Nyeem Qhov Analog Multimeter Result
Kauj Ruam 1. Nrhiav qhov ntsuas kom raug ntawm qhov ntsuas sib piv
Analog multimeter muaj rab koob tom qab lub qhov rais iav, uas txav los qhia qhov tshwm sim. Feem ntau, muaj peb daim ntawv sau tom qab lub koob. Nov yog peb qhov sib txawv, txhua tus uas tau siv rau lub hom phiaj sib txawv:
- Ω nplai yog rau kev nyeem tsis kam. Qhov no feem ntau yog qhov loj tshaj plaws, nyob rau sab saum toj. Tsis zoo li lwm qhov teev, tus 0 (xoom) tus nqi yog nyob rau sab xis tsis siv sab laug.
- Qhov ntsuas "DC" yog rau nyeem DC voltage.
- Qhov ntsuas "AC" yog rau nyeem AC voltage.
- Qhov ntsuas "dB" yog qhov kev xaiv tsawg tshaj plaws. Saib qhov kawg ntawm ntu no rau kev piav qhia luv luv.
Kauj Ruam 2. Ua qhov ntsuas qhov ntsuas hluav taws xob raws li koj qhov ntau
Ua tib zoo saib ntawm qhov ntsuas hluav taws xob, DC lossis AC. Yuav tsum muaj ntau kab ntawm cov lej hauv qab qhov ntsuas. Txheeb xyuas qhov twg koj tau xaiv ntawm tus lej (piv txwv li, 10V), thiab saib rau daim ntawv lo uas haum ib sab ntawm ib kab no. Nov yog kab koj yuav tsum nyeem qhov tshwm sim los ntawm.
Kauj Ruam 3. Kwv yees tus nqi nruab nrab ntawm cov lej
Kev ntsuas qhov ntsuas hluav taws xob ntawm qhov ntsuas hluav taws xob analog ua haujlwm zoo ib yam li tus kav ib txwm muaj. Qhov ntsuas tsis kam, txawm li cas los xij, yog logarithmic, lub ntsiab lus tias qhov sib nrug deb nruab nrab yog qhov kev hloov pauv sib txawv hauv qhov chaw koj nyob ntawm qhov ntsuas. Cov kab ntawm ob tus lej tseem sawv cev rau kev sib cais. Piv txwv, yog tias muaj peb kab ntawm "50" thiab 70, "cov no sawv cev rau 55, 60, thiab 65, txawm tias qhov sib txawv ntawm lawv zoo li qhov sib txawv.
Kauj Ruam 4. Muab cov ntawv nyeem tsis kam ntawm ib qho analog multimeter
Saib ntawm qhov chaw teeb tsa uas lub xov tooj ntawm koj lub multimeter tau teeb tsa. Qhov no yuav tsum muab koj tus lej los sib ntxiv nyeem ntawv. Piv txwv li, yog tias lub multimeter tau teeb tsa R x 100 os thiab rab koob taw tes rau 50 ohms, qhov tseeb tiv thaiv ntawm Circuit yog 100 x 50 = 5, 000.
Kauj Ruam 5. Tshawb nrhiav ntxiv txog qhov ntsuas dB
Qhov ntsuas "dB" (decibel), feem ntau qis tshaj, tsawg tshaj plaws ntawm qhov ntsuas sib piv, xav tau qee qhov kev qhia ntxiv los siv. Nws yog qhov ntsuas logarithmic ntsuas qhov ntsuas hluav taws xob (tseem hu ua nce lossis poob). Tus qauv dBv nplai hauv Asmeskas txhais 0dbv li 0.775 volts ntsuas tshaj 600 ohms ntawm kev tawm tsam, tab sis muaj kev sib tw dBu, dBm, thiab txawm tias dBV (nrog peev V) teev.
Ntu 3 ntawm 3: Kev daws teeb meem
Kauj Ruam 1. Teev qhov ntau
Tshwj tsis yog tias koj muaj lub ntsuas ntsuas ntsuas pib, txhua tus qauv yooj yim (voltage, tsis kam, thiab tam sim no) muaj ntau qhov chaw xaiv los ntawm. Qhov no yog qhov ntau, uas koj yuav tsum tau teeb tsa ua ntej koj txuas cov txuas mus rau hauv Circuit Court. Pib tawm nrog koj qhov kev kwv yees zoo tshaj plaws rau tus nqi uas tsuas yog qhov siab tshaj qhov tshwm sim. Piv txwv li, yog tias koj cia siab tias yuav ntsuas ib puag ncig 12 volts, teeb lub ntsuas rau 25V, tsis yog 10V, piv txwv tias yog ob qho kev xaiv ze tshaj plaws.
- Yog tias koj tsis muaj lub tswv yim dab tsi tam sim no cia siab, teeb tsa nws mus rau qhov siab tshaj plaws rau koj thawj zaug sim kom tsis txhob ua kom puas lub ntsuas.
- Lwm hom tsis zoo li yuav ua rau lub ntsuas puas tsuaj, tab sis xav txog qhov teeb meem tiv thaiv qis tshaj thiab 10V teeb tsa koj lub neej.
Kauj Ruam 2. Kho kom "tawm ntawm qhov ntsuas" nyeem
Ntawm lub ntsuas ntsuas digital, "OL," "OVER," lossis "overload" txhais tau tias koj yuav tsum xaiv qhov ntau dua, thaum qhov tshwm sim ze rau xoom txhais tau tias qis dua yuav muab qhov raug ntau dua. Ntawm qhov ntsuas sib piv, rab koob uas nyob ib txwm tseem txhais tau tias koj yuav tsum xaiv qhov qis dua. Ib rab koob uas mus txog qhov siab tshaj txhais tau tias koj yuav tsum xaiv qhov ntau dua.
Kauj Ruam 3. Tshem lub hwj chim ua ntej ntsuas kev tawm tsam
Tua lub hwj chim hloov lossis tshem lub roj teeb uas ua rau lub zog hluav taws xob txhawm rau kom tau txais kev nyeem tsis raug. Lub multimeter xa tawm tam sim no los ntsuas qhov tsis kam, thiab yog tias tam sim no ntxiv twb tau ntws lawm, qhov no yuav cuam tshuam qhov tshwm sim.
Kauj Ruam 4. Ntsuas tam sim no hauv koob
Txhawm rau ntsuas tam sim no, koj yuav tsum tsim ib qho Circuit Court uas suav nrog multimeter "hauv series" nrog rau lwm cov khoom siv. Piv txwv li, txuas ib lub xov hlau los ntawm lub dav hlau roj teeb, tom qab ntawd txuas ib qho kev sojntsuam mus rau xaim thiab ib qho mus rau lub roj teeb kom kaw lub Circuit Court dua.
Kauj Ruam 5. Ntsuas qhov ntsuas hluav taws xob sib npaug
Qhov ntsuas hluav taws xob yog qhov hloov pauv hluav taws xob hluav taws xob hla qee qhov ntawm Circuit Court. Lub Circuit Court yuav tsum raug kaw nrog cov dej ntws tam sim no, tom qab ntawd lub ntsuas ntsuas yuav tsum muaj ob qhov kev soj ntsuam tso rau ntawm cov ntsiab lus sib txawv ntawm Circuit Court kom txuas nws "ua ke" nrog rau hauv Circuit Court. Qhov no yuav tsum ua kom zoo kom tsis txhob muaj qhov sib txawv.
Kauj Ruam 6. Calibrate ohms ntawm qhov ntsuas sib piv
Cov ntsuas ntsuas sib piv muaj cov xov tooj ntxiv, siv los kho qhov ntsuas tsis kam thiab feem ntau cim nrog Ω. Ua ntej ua qhov ntsuas ntsuas, txuas ob qhov kev sojntsuam xaus rau ib leeg. Tig lub xov tooj kom txog thaum ntsuas ohm nyeem xoom, txhawm rau ntsuas nws, tom qab ntawd ua koj qhov kev sim tiag.
Yees duab - Los ntawm kev siv qhov kev pabcuam no, qee cov ntaub ntawv yuav raug muab qhia rau YouTube
Lub tswv yim
- Yog tias rab koob ntawm qhov ntsuas sib piv sib piv qis dua xoom txawm nyob ntawm qhov qis tshaj, tom qab ntawd koj cov "+" thiab "-" cov khoom sib txuas yuav rov qab los. Hloov cov txuas thiab siv lwm txoj kev nyeem ntawv.
- Yog tias muaj daim iav tom qab lub koob ntawm koj qhov analog multimeter, tig lub 'meter' sab laug lossis sab xis kom lub koob npog nws tus kheej rau qhov ua kom pom tseeb dua.
- Yog tias koj muaj teeb meem nyeem digital multimeter, xa mus rau phau ntawv qhia. Los ntawm lub neej ntawd, nws yuav tsum tso saib cov lej tshwm sim, tab sis kuj tseem tuaj yeem yog cov teeb tsa uas tso saib kab duab kab lossis lwm yam ntaub ntawv qhia.
- Kev ntsuas thawj zaug yuav hloov pauv thaum ntsuas AC voltage, tab sis qhov no yuav ruaj khov rau kev nyeem tau raug.
- Yog tias lub ntsuas ntsuas tsis ua haujlwm, tom qab ntawd koj yuav tsum ntsuas nws txhawm rau txiav txim siab qhov teeb meem.
- Yog tias koj muaj teeb meem nco txog qhov sib txawv ntawm qhov hluav taws xob thiab qhov amperage, kos duab lub raj dej. Qhov ntsuas hluav taws xob yog qhov dej siab uas txav los ntawm lub qhov dej, thiab qhov amperage yog qhov loj ntawm lub qhov dej, uas tswj hwm dej ntau npaum li cas tuaj yeem txav mus los ib zaug.
