Cov Multimeters puas tuaj yeem siv qhov chaw ntawm Analog 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 cov multimeter los yog analog (pointer) multimeter yog ib lo lus nug. Qee tus neeg hais tias digital multimeters tau maj mam hloov analog multimeters, tab sis ntau tus kws tshaj lij hluav taws xob tseem tau siv ntau dua los siv analog multimeters. Dab tsi yog qhov sib txawv ntawm digital multimeter thiab analog multimeter? Qhov twg yog qhov zoo dua los siv?
Qhov sib txawv loj tshaj plaws ntawm digital multimeter thiab analog multimeter yog cov zaub ntawm kev nyeem ntawv. Lub 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 multimeters tsis tuaj yeem sib piv, tab sis lawv kuj muaj lawv tus kheej qhov zoo, uas yog tias lawv muaj peev xwm intuitively xav txog cov kev hloov pauv ntawm cov khoom ntsuas los ntawm qhov deflection instantaneous ntawm tus pointer.
Vim lub fact tias cov multimeters digital ntsuas thiab tso saib hluav taws xob nyob rau hauv ib tug intermittent yam, nws tsis yooj yim los soj ntsuam cov kev hloov tas mus li thiab tiam sis ntawm cov ntsuas hluav taws xob. Piv txwv li, ib tug digital multimeter tsis yooj yim thiab intuitive raws li ib tug analog multimeter los ntsuam xyuas cov txheej txheem them nqi ntawm capacitors, variation ntawm thermistor tsis kam nrog kub, thiab kev soj ntsuam ntawm variation yam ntxwv ntawm photoresistor kuj nrog lub teeb.
Raws li txoj cai ntawm kev ua haujlwm, analog multimeters thiab digital multimeters kuj txawv. Internal qauv ntawm analog multimeters muaj xws li ib tug meter taub hau, ib tug resistor, thiab ib tug roj teeb. Lub taub hau ntsuas feem ntau siv lub tshuab hluav taws xob magneto DC microampere meter. Thaum ntsuas kev tiv thaiv, lub roj teeb sab hauv yuav tsum tau siv, thiab lub davhlau ya nyob twg zoo ntawm lub roj teeb yuav tsum tau txuas nrog lub ntsuas hluav taws xob dub, yog li tam sim no ntws tawm ntawm qhov kev sojntsuam dub thiab mus rau qhov kev sojntsuam liab. Thaum ntsuas DC tam sim no, lub shunt resistor txuas nrog los ntawm kev hloov lub zog kom hloov qhov tam sim no. Txij li thaum tag nrho cov kev tsis ncaj ncees tam sim no ntawm lub 'meter' me me, lub shunt resistor yog siv los nthuav qhov ntau. Thaum ntsuas DC voltage, tus resistor txuas nrog hauv cov koob nrog lub ntsuas lub taub hau, thiab cov khoom sib txawv ntxiv tau siv los ua kom tau txais kev hloov pauv ntawm ntau qhov sib txawv.
Lub tshuab hluav taws xob digital yog tsim los ntawm kev hloov pauv muaj nuj nqi, A / D converter, LCD zaub, lub zog hluav taws xob, thiab kev hloov pauv hloov pauv hloov pauv, uas feem ntau siv A / D converter ICL7106 dual integration hom A / D converter. ICL7106 txais ob qhov sib xyaw ua ke, thawj qhov sib xyaw ua ke ntawm cov tswv yim analog teeb liab V1, hu ua cov txheej txheem sampling; Qhov thib ob kev koom ua ke ntawm kev siv voltage - VEF kev koom ua ke yog hu ua cov txheej txheem sib piv. Suav ob txoj kev sib koom ua ke siv 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 rau hauv DC voltage signals.
