Analog Multimeters puas tuaj yeem hloov tau los ntawm Digital Multimeters?
Undoubtedly, ib tug multimeter tuaj yeem hais tau tias yog cov cuab yeej siv hluav taws xob uas siv ntau tshaj plaws rau cov neeg siv hluav taws xob, tab sis xaiv ib qho digital multimeter lossis analog (pointer) multimeter yog ib qho teeb meem. Qee tus neeg hais tias digital multimeter tau maj mam hloov analog multimeter, tab sis ntau tus kws tshaj lij hluav taws xob tseem tau siv ntau dua los siv analog multimeter. Dab tsi yog qhov sib txawv ntawm digital multimeter thiab analog multimeter? Qhov twg yog qhov zoo dua los siv?
Ua ntej, qhov sib txawv loj tshaj plaws ntawm digital multimeter thiab analog multimeter yog qhov nyeem tau tso tawm. 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, ua rau kev nyeem ntawv yooj yim thiab raug. Hauv qhov no, analog multimeter tsis tuaj yeem muab piv rau, tab sis nws kuj muaj nws tus kheej qhov zoo dua, uas yog tias nws muaj peev xwm intuitively xav txog cov kev hloov pauv ntawm cov khoom ntsuas los ntawm qhov deflection instantaneous ntawm tus pointer.
Vim qhov kev ntsuas tsis sib xws thiab tso saib ntawm digital multimeter, nws tsis yooj yim los soj ntsuam cov txheej txheem hloov pauv tas mus li thiab cov qauv ntawm qhov ntsuas hluav taws xob ntau. Piv txwv li, digital multimeter tej zaum yuav tsis yooj yim thiab intuitive raws li ib qho analog multimeter hauv kev txheeb xyuas cov txheej txheem them nqi ntawm cov khoom siv hluav taws xob, qhov kev hloov pauv ntawm qhov ntsuas kub ntawm qhov ntsuas kub, thiab saib xyuas cov yam ntxwv sib txawv ntawm qhov ntsuas qhov ntsuas qhov ntsuas 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 suav nrog lub taub hau 'meter', resistor, thiab roj teeb, ntawm cov 'meter' taub hau feem ntau yog magnetoelectric DC microampere meter. Thaum ntsuas kev tiv thaiv, tsuas yog cov roj teeb sab hauv yuav tsum tau siv. Cov ncej zoo ntawm lub roj teeb txuas nrog cov hlau lead dub, yog li tam sim no ntws tawm ntawm cov hlau lead dub thiab mus rau hauv cov hlau lead liab. Thaum ntsuas DC tam sim no, shunt tsis kam yog siv los nthuav qhov ntau yam los ntawm kev hloov lub zog thiab kev sib txuas cov kab hluav taws xob sib txuas, vim tias tag nrho cov kev tsis ncaj ncees tam sim no ntawm lub taub hau me me. Thaum ntsuas DC voltage, series resistors txuas nrog lub ntsuas lub taub hau kom ua tiav kev hloov pauv ntawm ntau qhov sib txawv los ntawm qhov sib txawv ntxiv cov resistors.
Lub tshuab hluav taws xob digital yog tsim los ntawm kev hloov pauv muaj nuj nqi, A / D converter, LCD zaub (kua siv lead ua kua), fais fab mov, thiab muaj nuj nqi / ntau hloov pauv. A/D converter feem ntau siv ICL7106 dual integral A/D converter. ICL7106 txais ob qhov kev sib koom ua ke, thawj qhov kev sib koom ua ke V1 ntawm cov tswv yim analog teeb liab, uas yog hu ua cov txheej txheem sampling; Qhov thib ob kev koom ua ke ntawm qhov siv voltage - VEF yog hu ua cov txheej txheem sib piv. Suav ob txoj kev sib koom ua ke los ntawm lub txee binary, hloov lawv mus rau hauv cov lej digital, thiab muab tso rau hauv daim ntawv digital. Txhawm rau ntsuas AC voltage, tam sim no, tsis kam, capacitance, diode rau pem hauv ntej voltage poob, transistor amplification factor, thiab lwm yam khoom siv hluav taws xob, cov khoom siv sib txuas yuav tsum tau ntxiv los hloov cov ntsuas hluav taws xob ntau rau hauv DC voltage teeb liab.
Muaj qhov sib txawv ntawm lub polarity ntawm lub roj teeb txuas nrog sab hauv ntawm lub tshuab digital multimeter thiab lub pointer hom multimeter: cov hlau lead liab txuas nrog lub zoo ncej ntawm lub roj teeb, thaum cov hlau lead dub txuas nrog tus ncej tsis zoo, thaum lub pointer hom tshwm sim los ua qhov opposite. Lub diode ntsuas los ntawm digital meter raws nraim qhov tseeb polarity ntawm diode, thaum lub pointer hom yog qhov txawv.
Hauv kev siv, analog multimeters yog nruab nrog txhua yam xoom hloov kho pob qhov rooj lossis hloov kho screws. Yog tias pom tias rab koob tsis taw tes rau lub tshuab xoom txoj haujlwm (xws li xoom taw tes ntawm qhov ntsuas hluav taws xob lossis qhov infinity ntawm ohm nplai), nws yuav tsum maj mam tig thiab maj mam tig lub tshuab xoom hloov kho nrog tus ntiv tes lossis screwdriver rov qab rab koob mus rau xoom kom tshem tawm xoom yuam kev. Thiab cov multimeter digital muaj qhov tsis siv neeg xoom rov qab ua haujlwm, uas yooj yim dua.
Tsis tas li ntawd, ntau lub tshuab digital multimeters tam sim no tau ntxiv ntau qhov kev ua haujlwm piv rau pointer multimeters, xws li capacitance, zaus, kub, transistor ntsuas ntau, thiab lwm yam, uas kuj tau txhim kho rhiab heev, raug, thiab muaj peev xwm dhau. Zuag qhia tag nrho, digital multimeter muaj qhov pom tseeb zoo, tab sis nws tsis tuaj yeem hloov pauv analog multimeter. Hauv kev ntsuas sib txawv, txhua tus muaj nws tus kheej qhov zoo thiab yuav tsum tau xaiv raws li lawv qhov kev ntsuas tiag tiag.
