Txheeb xyuas qhov ua haujlwm thiab lub hauv paus ntsiab lus ntawm multimeter
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 cov qauv qhia. 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.
Multimeter yog ib qho cuab yeej magnetoelectric nrog lub rectifier uas tuaj yeem ntsuas ntau yam hluav taws xob xws li AC thiab DC tam sim no, voltage thiab tsis kam. Rau txhua qhov hluav taws xob ntau, feem ntau muaj ntau ntau yam. Kuj hu ua multimeter lossis multimeter luv luv. Lub multimeter yog tsim los ntawm magnetoelectric ammeter (meter taub hau), ntsuas Circuit Court thiab xaiv hloov. Ntau yam hluav taws xob tsis tuaj yeem ntsuas tau yooj yim los ntawm kev hloov pauv kev xaiv. Lub hauv paus tseem ceeb ntawm nws txoj kev xam Circuit Court yog kaw Circuit Court Ohm txoj cai. Muaj ntau hom multimeters, thiab lawv yuav tsum tau xaiv raws li cov kev cai sib txawv thaum siv lawv.
Basic functions
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 txuj ci tseem ceeb ntawm kev siv tshuab hluav taws xob kom paub meej txog 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.
DC tam sim no ntau yam ntawm lub multimeter yog ntau yam 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 taub hau ntawm lub multimeter yog ib qho kev ntsuas magnetoelectric system, uas tsuas tuaj yeem dhau los ntawm qhov ncaj qha tam sim no, thiab siv cov diodes hloov pauv mus rau qhov tam sim no ncaj qha, yog li paub txog qhov ntsuas ntawm kev hloov tam sim no.
Qauv thiab muaj pes tsawg leeg
Lub multimeter yog tsim los ntawm peb qhov tseem ceeb: meter taub hau, ntsuas Circuit Court thiab hloov pauv hloov. Lub multimeter yog ib qho cuab yeej yooj yim hauv kev ntsuas hluav taws xob, thiab nws kuj yog ib qho cuab yeej siv dav siv. Multimeters tseem hu ua multimeters, peb lub hom phiaj ntsuas (A, V, Ω yog tam sim no, voltage, thiab tsis kam), multiplexers, thiab meters. Multimeters muab faib ua pointer multimeters thiab digital multimeters. Kuj tseem muaj cov zaub nrog oscilloscope muaj nuj nqi. Wave multimeter yog ib qho khoom siv ntau yam, ntau qhov ntsuas ntsuas. General multimeters tuaj yeem ntsuas DC tam sim no, DC voltage, AC voltage, tsis kam thiab suab qib, thiab lwm yam, thiab qee qhov kuj tuaj yeem ntsuas AC tam sim no, capacitance, inductance, kub thiab qee qhov tsis sib xws ntawm semiconductors (diodes, transistors). Digital multimeters tau dhau los ua qhov tseem ceeb thiab tau hloov cov ntsuas analog. Piv nrog cov cuab yeej analog, cov cuab yeej digital muaj qhov rhiab heev, siab precision, pom tseeb, muaj zog tshaj qhov muaj peev xwm, nqa tau yooj yim, thiab yooj yim dua thiab siv yooj yim.
taub hau
Lub taub hau ntawm multimeter yog rhiab heev galvanometer. Lub dial ntawm lub taub hau yog luam tawm nrog ntau yam cim, nplai cov cim thiab qhov tseem ceeb. Lub cim AV-Ω qhia tias ammeter yog multimeter uas tuaj yeem ntsuas tam sim no, voltage thiab tsis kam. Muaj ntau lub nplai kab luam tawm ntawm lub xov tooj, cov uas ib qho cim nrog "Ω" ntawm sab xis yog cov kab hluav taws xob tsis sib haum, sab xis kawg yog xoom, sab laug kawg yog ∞, thiab qhov ntsuas tus nqi faib tsis sib npaug. Lub cim "-" lossis "DC" txhais tau hais tias ncaj qha tam sim no, "~" lossis "AC" txhais tau tias hloov pauv tam sim no, thiab "~" txhais tau hais tias qhov ntsuas kab ntau rau AC thiab DC. Ob peb kab ntawm tus lej nyob rau hauv kab kab yog qhov ntsuas qhov tseem ceeb sib raug rau cov haujlwm sib txawv ntawm tus xaiv hloov.
Kuj tseem muaj lub tshuab xoom txoj hauj lwm hloov kho pob qhov rooj ntawm lub taub hau 'meter' los kho qhov xoom txoj hauj lwm ntawm tus taw tes ntawm sab laug kawg.
hloov
Cov kev xaiv hloov ntawm lub multimeter yog ib txoj hauj lwm tig hloov. Siv los xaiv cov khoom ntsuas thiab thaj tsam.
General multimeter ntsuas cov khoom suav nrog: "mA"; DC tam sim no, "V(-)": DC voltage, "V(~)": AC voltage, "Ω": tsis kam. Txhua yam khoom ntsuas tau muab faib ua ntau yam sib txawv rau kev xaiv.
Test lead thiab test lead jack
Cov thawj coj kuaj tau muab faib ua liab thiab dub. Thaum siv, ntxig cov hlau kuaj liab rau hauv lub jack cim "ntxiv", thiab ntxig cov hlau lead dub rau hauv lub jack cim "-".
Meter (hom pointer)
Nws yog lub siab rhiab heev magnetoelectric DC ammeter. Lub ntsiab kev ua tau zoo ntawm lub multimeter yeej nyob ntawm qhov kev ua tau zoo ntawm lub taub hau meter. Lub rhiab heev ntawm lub 'meter' taub hau yog hais txog DC tam sim no tus nqi ntws los ntawm lub taub hau 'meter' thaum lub pointer ntawm lub taub hau 'meter' yog deflected ntawm tag nrho cov nplai. Qhov tsawg dua tus nqi, qhov siab dua ntawm lub taub hau meter. Qhov ntau dua qhov kev tiv thaiv sab hauv thaum ntsuas qhov voltage, nws qhov kev ua tau zoo dua. Muaj plaub kab kab ntawm lub taub hau 'meter', thiab lawv txoj haujlwm yog raws li hauv qab no: cov tuav (los ntawm sab saum toj mus rau hauv qab) yog cim nrog R los yog Ω, qhia txog tus nqi tiv thaiv, thiab thaum hloov pauv nyob rau hauv ohm thaiv, nyeem qhov ntsuas no kab. Qhov thib ob bar yog cim nrog ∽ thiab VA, qhia txog AC, DC voltage thiab DC tam sim no tus nqi. Thaum qhov hloov pauv hloov mus rau hauv AC, DC voltage lossis DC tam sim no iav, thiab qhov ntau yog nyob rau hauv txoj hauj lwm uas tsis yog AC 10V, nyeem cov nplai Hlau. Qhov thib peb kab yog cim nrog 10V, uas qhia txog AC voltage tus nqi ntawm 10V. Thaum qhov hloov pauv yog nyob rau hauv AC thiab DC voltage ntau thiab qhov ntau yog nyob ntawm AC 10V, nyeem cov kab ntawv ntsuas no. Qhov thib plaub bar, sau npe dB, qhia txog qib suab.
Meter (digital)
Lub taub hau ntawm lub tshuab hluav taws xob digital feem ntau yog tsim los ntawm A / D (analog / digital) hloov dua siab tshiab nti ntxiv rau cov khoom siv peripheral ntxiv rau cov kua siv lead ua kua. Qhov tseeb ntawm multimeter raug cuam tshuam los ntawm lub taub hau. Tus lej hloov los ntawm A/D nti feem ntau kuj hu ua Rau 3 1/2 tus lej multimeter, 4 1/2 tus lej multimeter thiab lwm yam. Feem ntau siv cov chips yog ICL7106 (3.5-digit LCD phau ntawv ntau yam classic nti, tom qab versions yog 7106A, 7106B, 7206, 7240, thiab lwm yam), ICL7129 (4 thiab ib nrab LCD phau ntawv ntau yam classic nti), ICL7107 ( 3.
Kev ntsuas kab
Kev ntsuas hluav taws xob yog ib lub voj voog siv los hloov ntau yam khoom ntsuas mus rau hauv me me DC tam sim no haum rau kev ntsuas ntsuas. Nws yog tsim los ntawm resistors, semiconductor Cheebtsam thiab roj teeb.
Nws tuaj yeem hloov pauv ntau yam khoom ntsuas (xws li tam sim no, voltage, tsis kam, thiab lwm yam) thiab ntau qhov sib txawv rau hauv qee qhov me me DC tam sim no los ntawm kev ua haujlwm ntau yam (xws li rectification, shunting, voltage division, etc.) gauge los ntsuas .
hloov pauv hloov
Nws txoj haujlwm yog xaiv cov kab ntsuas ntau yam kom tau raws li qhov yuav tsum tau ntsuas ntawm ntau hom thiab ntau yam. Kev hloov pauv hloov feem ntau yog lub voj voj voog nrog kev ua haujlwm thiab ntau yam cim nyob ib puag ncig nws.
txoj cai ua haujlwm
Lub hauv paus ntsiab lus ntawm multimeter yog siv lub rhiab magnetoelectric DC ammeter (microampere meter) ua lub taub hau meter.
tsim qauv
Cov txheej txheem ntsuas ntawm digital multimeter converts tus nqi ntsuas mus rau hauv DC voltage teeb liab los ntawm kev hloov pauv hauv Circuit Court, thiab tom qab ntawd hloov cov voltage analog kom muaj nuj nqis rau hauv digital kom muaj nuj nqis los ntawm analog / digital (A / D) converter, thiab tom qab ntawd suav los ntawm hluav taws xob. txee, thiab thaum kawg siv tus nqi digital ntawm qhov ntsuas tau pom ncaj qha rau ntawm cov zaub.
Kev ua haujlwm ntawm multimeter los ntsuas qhov voltage, tam sim no thiab tsis kam yog pom tau los ntawm kev hloov pauv hauv Circuit Court, thaum ntsuas qhov ntsuas tam sim no thiab qhov tsis kam yog raws li qhov ntsuas ntawm qhov voltage, uas yog hais tias, cov multimeter yog nthuav raws li lub hauv paus. digital DC voltmeter.
Lub A / D converter ntawm cov DC voltmeter hloov cov analog voltage ntau uas hloov tsis tu ncua nrog lub sij hawm mus rau hauv ib tug digital kom muaj nuj nqis, thiab tom qab ntawd tus lej digital raug suav los ntawm lub txee hluav taws xob kom tau txais cov txiaj ntsig ntsuas, thiab tom qab ntawd qhov ntsuas tau tshwm sim los ntawm lub decoding zaub Circuit Court. Lub logic tswj Circuit Court tswj cov kev sib koom ua haujlwm ntawm lub voj voog, thiab ua tiav tag nrho cov txheej txheem ntsuas hauv ib ntus raws li qhov kev txiav txim ntawm lub moos.
Thaum ib qho me me tam sim no dhau los ntawm lub taub hau meter, yuav muaj qhov qhia tam sim no. Txawm li cas los xij, lub taub hau ' meter ' tsis tuaj yeem dhau qhov tam sim no loj, yog li qee cov resistors yuav tsum tau txuas nrog nyob rau hauv parallel los yog series ntawm lub taub hau 'meter' kom shunt los yog txo qhov voltage, thiaj li ntsuas qhov tam sim no, voltage thiab kuj nyob rau hauv lub Circuit Court.
