Ib tug multimeter puas tuaj yeem hloov qhov analog multimeter?
Undoubtedly, lub multimeter tuaj yeem hais tau tias yog cov cuab yeej siv hluav taws xob feem ntau siv rau cov neeg siv hluav taws xob, tab sis nws yog ib qho teeb meem xaiv cov multimeter los yog analog (pointer) multimeter ~ Qee cov neeg hais tias cov multimeters tau maj mam hloov analog multimeters, tab sis. ntau tus kws tshaj lij hluav taws xob qub tseem siv ntau dua rau nws. siv nrog analog multimeters. Dab tsi yog qhov sib txawv ntawm digital multimeter thiab analog multimeter? Qhov twg yog qhov zoo dua los siv?
Ua ntej tshaj plaws, qhov sib txawv loj tshaj plaws ntawm digital multimeter thiab analog multimeter yog cov ntawv nyeem. Cov multimeter digital yog cov kua siv lead ua kua nrog cov kev daws teeb meem siab, uas tuaj yeem tshem tawm cov parallax thaum nyeem cov ntaub ntawv. Hais txog kev hais lus, kev nyeem ntawv yooj yim thiab raug. Hauv qhov kev hwm no, analog multimeter yog qhov sib piv tsis tau, tab sis analog multimeter kuj muaj nws tus kheej qhov zoo, uas yog, nws tuaj yeem cuam tshuam cov cuab yeej hloov pauv ntawm cov khoom ntsuas tau zoo heev los ntawm kev hloov pauv tam sim ntawm tus taw tes.
Txij li thaum lub digital multimeter ntsuas thiab qhia tsis tu ncua, nws tsis yooj yim los soj ntsuam cov txheej txheem hloov pauv tas li ntawm qhov ntsuas hluav taws xob ntau thiab nws txoj kev hloov pauv. Piv txwv li, digital multimeters tsis yooj yim thiab intuitive li analog multimeters rau kev kuaj xyuas cov txheej txheem them nyiaj ntawm cov khoom siv hluav taws xob, txoj cai ntawm thermistor tsis kam hloov nrog kub, thiab saib xyuas cov yam ntxwv ntawm photoresistor kuj hloov nrog lub teeb.
Raws li txoj cai ntawm kev ua haujlwm, analog multimeter thiab digital multimeter kuj txawv. Cov qauv sab hauv ntawm analog multimeter muaj xws li lub taub hau 'meter', resistor, thiab roj teeb. Lub taub hau ' meter ' feem ntau siv lub magnetoelectric DC microammeter. Tsuas yog thaum ntsuas kev tiv thaiv, siv nws cov roj teeb sab hauv. Cov ncej zoo ntawm lub roj teeb txuas nrog cov hlau lead kuaj dub, yog li tam sim no ntws tawm ntawm cov hlau lead kuaj dub thiab cov tshuaj ntsuam liab liab ntws mus rau hauv. Thaum ntsuas DC tam sim no, shunt tam sim no los ntawm kev sib txuas cov hluav taws xob sib txuas los ntawm kev hloov cov iav. Vim hais tias tag nrho-bias tam sim no ntawm lub taub hau 'meter' me me heev, cov shunt resistors yog siv los nthuav qhov ntau. Thaum ntsuas DC voltage, txuas cov resistors nyob rau hauv series ntawm lub taub hau 'meter', thiab paub txog kev hloov pauv ntawm ntau yam sib txawv los ntawm cov resistors sib txawv.
Lub multimeter digital yog tsim los ntawm kev hloov pauv muaj nuj nqi, A / D converter, ib qho LCD zaub (kua siv lead ua kua), lub hwj huam mov, thiab kev hloov pauv hloov pauv hloov pauv, thiab qhov hloov pauv hloov pauv hloov pauv ntau npaum li cas A / D feem ntau siv ICL7106 dual- Integral A/D converter. ICL7106 siv ob qho kev sib koom ua ke, thawj qhov kev sib koom ua ke ntawm cov tswv yim analog teeb liab V1 yog hu ua cov txheej txheem sampling; qhov thib ob kev koom ua ke ntawm qhov siv hluav taws xob - VEF yog hu ua cov txheej txheem sib piv. Ob txoj kev sib koom ua ke yog suav los ntawm lub txee binary, hloov mus rau hauv cov lej, thiab tso tawm hauv daim ntawv digital. Txhawm rau ntsuas hluav taws xob xws li AC voltage, tam sim no, tsis kam, capacitance, diode rau pem hauv ntej voltage poob, thiab transistor amplification factor, yuav tsum tau ntxiv ib tug sib txuas converter los hloov cov ntsuas hluav taws xob rau hauv DC voltage teeb liab.
Lub polarity ntawm lub roj teeb txuas nrog hauv cov digital multimeter thiab lub pointer multimeter yog qhov sib txawv: cov ntawv ntsuas liab digital yog txuas nrog tus ncej zoo ntawm lub roj teeb, cov hlau kuaj dub txuas nrog tus ncej tsis zoo, thiab cov analog multimeter tsuas yog qhov zoo. rov qab. Lub diode ntsuas los ntawm cov ntsuas digital yog raws nraim nrog qhov tseeb polarity ntawm diode, thaum lub pointer hom yog qhov txawv.
Hauv kev siv, analog multimeters yog nruab nrog txhua yam xoom taw tes hloov kho pob qhov rooj lossis hloov kho screws. Yog tias koj pom tias txhais tes tsis taw tes rau lub tshuab xoom txoj hauj lwm (uas yog, xoom taw tes ntawm qhov ntsuas hluav taws xob thiab qhov infinity ntawm ohm nplai), koj yuav tsum siv koj cov ntiv tes los yog lub hau ntswj. Maj mam tig lub tshuab xoom taw tes hloov kho kom rov qab saib ob txhais tes mus rau xoom kom tshem tawm xoom point yuam kev. Digital multimeter muaj qhov tsis siv neeg xoom rov qab ua haujlwm, uas yooj yim dua.
Tsis tas li ntawd, piv nrog lub pointer multimeter, ntau cov multimeters digital tam sim no muaj ntau lub zog ua haujlwm, xws li lub peev xwm, zaus, qhov kub thiab txias, triode ntsuas iav, thiab lwm yam, thiab kuj tseem muaj qee qhov kev txhim kho hauv rhiab heev, raug, thiab muaj peev xwm dhau. Feem ntau, digital multimeters muaj qhov zoo tshaj plaws, tab sis lawv tsis tuaj yeem hloov pauv analog multimeters. Tseem muaj qhov zoo thiab qhov tsis zoo hauv cov xwm txheej ntsuas sib txawv, thiab koj yuav tsum xaiv raws li koj qhov kev xav tau ntsuas tiag tiag.
