Ib qho analog multimeter puas tuaj yeem hloov nrog lub digital?
Lub multimeter tsis muaj qhov tsis ntseeg txog cov cuab yeej ntsuas hluav taws xob uas cov neeg siv hluav taws xob siv feem ntau, tab sis kev txiav txim siab ntawm digital multimeter thiab analog (pointer) multimeter tuaj yeem nyuaj. rau kev siv nrog analog multimeters, txawm hais tias qhov tsis sib xws ua los ntawm qee tus. Ntau tus paub txog, cov kws tshaj lij hluav taws xob laus tseem tau siv ntau dua rau nws. Dab tsi yog qhov txawv ntawm analog multimeter los ntawm digital multimeter? Koj yuav tsum siv qhov twg?
Cov ntawv nyeem yog qhov sib txawv ntawm qhov digital multimeter thiab analog multimeter. Lub siab daws teeb meem kua siv lead ua zaub siv hauv digital multimeter tuaj yeem tshem tawm parallax thaum nyeem cov ntaub ntawv. Kev nyeem ntawv yog yooj yim thiab meej, txheeb ze hais lus. Lub analog multimeter yog unmatched nyob rau hauv no hais txog, tab sis nws kuj muaj ib co tshwj xeeb zoo ntawm nws tus kheej, xws li lub peev xwm los cuam tshuam cov cuab yeej hloov pauv ntawm cov khoom ntsuas intuitively los ntawm instantaneous deflection ntawm pointer.
Kev ntsuas tsis sib xws thiab cov lus qhia ntawm digital multimeter ua rau nws nyuaj rau taug qab qhov ntsuas hluav taws xob kom muaj nuj nqis ntawm cov txheej txheem hloov mus tas li thiab hloov pauv. Piv txwv li, digital multimeters tsis tshua muaj txiaj ntsig thiab siv tau zoo dua li analog multimeters thaum nws los tshuaj xyuas txoj kev capacitors them, txoj kev resistor kuj hloov nrog kub, thiab txoj kev 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 cov lej digital, 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. Cov multimeter digital 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.
