Core zoo thiab qhov tsis zoo ntawm Analog vs. Digital Multimeters
Tus pointer multimeter yog qhov ntsuas nruab nrab tus nqi nrog kev nkag siab thiab pom kev nyeem ntawv. (Feem ntau, tus nqi nyeem ntawv yog ze ze rau lub pointer viav vias lub kaum sab xis, yog li nws yog qhov yooj yim heev).
Ib qho digital multimeter yog ib qho cuab yeej tam sim no. Nws siv cov qauv ntsuas txhua txhua 0.3 vib nas this los tso saib cov txiaj ntsig ntsuas, thiab qee zaum cov txiaj ntsig ntawm txhua qhov piv txwv tsuas yog zoo sib xws thiab tsis zoo ib yam, uas tsis yooj yim rau kev nyeem cov txiaj ntsig raws li tus taw qhia raws li txoj hauv kev.
Ib tug pointer multimeter feem ntau tsis muaj lub amplifier sab hauv, yog li qhov kev tiv thaiv sab hauv kuj yog me me. Piv txwv li, MF-10 hom muaj DC voltage rhiab heev ntawm 100 kiloohms ib volt. DC voltage rhiab heev ntawm MF-500 qauv yog 20 kiloohms ib volt.
Vim yog kev siv sab hauv ntawm kev ua haujlwm amplifier circuits, cov kev tiv thaiv sab hauv ntawm digital multimeters tuaj yeem ua tau loj heev, feem ntau ntawm 1M ohms lossis ntau dua. (xws li rhiab heev tuaj yeem tau). Qhov no ua rau qhov cuam tshuam ntawm qhov ntsuas hluav taws xob me me thiab qhov ntsuas qhov tseeb dua.
Pointer multimeters muaj qhov tsis kam sab hauv thiab feem ntau siv cov khoom sib cais los tsim cov shunt thiab voltage divider circuits. Yog li ntawd cov
Cov yam ntxwv zaus tsis sib xws (piv rau digital), thaum cov yam ntxwv zaus ntawm tus pointer multimeter kuj zoo dua.
Lub pointer hom multimeter muaj ib qho yooj yim sab hauv qauv, yog li nws muaj tus nqi qis dua, tsawg zog, kev saib xyuas yooj yim, thiab muaj zog overcurrent thiab overvoltage peev xwm. Digital multimeter txais ntau yam oscillation, amplification, zaus division tiv thaiv circuits hauv, yog li nws muaj ntau lub zog. Piv txwv li, nws tuaj yeem ntsuas qhov kub thiab txias, zaus (hauv qhov qis dua), capacitance, inductance, thiab siv los ua lub teeb liab generator, thiab lwm yam.
Digital multimeters muaj peev xwm ua tsis tau zoo vim yog siv ntau qhov sib xyaw ua ke hauv lawv cov qauv sab hauv (txawm tias qee qhov tam sim no muaj kev hloov pauv tsis siv neeg, kev tiv thaiv tsis siv neeg, thiab lwm yam, tab sis siv ntau txoj hauv kev), thiab feem ntau tsis yooj yim kho tom qab kev puas tsuaj. Cov zis hluav taws xob ntawm digital multimeter yog qhov tsawg (feem ntau tsis tshaj 1 volt). Nws tsis yooj yim rau kev sim qee yam khoom siv nrog cov yam ntxwv tshwj xeeb, xws li thyristors thiab lub teeb -emitting diodes.
Cov zis hluav taws xob ntawm tus pointer multimeter yog qhov siab (xws li 10.5 volts, 12 volts, thiab lwm yam). Cov tam sim no kuj siab (xws li MF-500 * 1 nrog qhov siab tshaj plaws ntawm 100mA hauv European ntau), uas ua rau nws yooj yim rau kev sim thyristors, lub teeb-emitting diodes, thiab lwm yam.
