Qhov sib txawv ntawm analogue multimeter thiab digital multimeter
Analogue multimeter yog ib qho ntsuas nruab nrab nrog qhov kev nyeem ntawv zoo thiab muaj txiaj ntsig. Digital multimeter yog ib qho ntsuas ntsuas ntsuas tam sim. Nws siv 0.3 vib nas this los ua piv txwv thiab cov txiaj ntsig tsuas yog zoo sib xws, tsis zoo ib yam, thiab nws tsis yooj yim heev los nyeem cov txiaj ntsig.
Analog multimeters feem ntau tsis muaj lub amplifier sab hauv, yog li qhov kev tiv thaiv sab hauv me me. Piv txwv li, MF-10 qauv muaj DC voltage rhiab heev ntawm 100 kΩ / V. Qhov no suav hais tias yog qhov zoo tshaj plaws. DC voltage rhiab heev ntawm MF -500 qauv yog 20 kΩ / V. Vim tias cov digital multimeter siv lub tshuab ua haujlwm ua haujlwm hauv lub tshuab hluav taws xob sab hauv, qhov kev tiv thaiv sab hauv tuaj yeem ua rau loj heev. Nws feem ntau yog 1M ohm lossis loj dua, uas ua rau muaj kev cuam tshuam rau lub voj voog hauv qab kev sim me me thiab qhov ntsuas qhov tseeb dua.
Vim tias qhov kev tiv thaiv sab hauv ntawm tus pointer multimeter me me, cov khoom sib cais feem ntau yog siv los ua ib qho shunt thiab voltage divider circuit. Yog li ntawd, cov yam ntxwv zaus tsis sib xws (piv rau cov digital), thaum cov yam ntxwv zaus ntawm analog multimeters kuj zoo dua.
Cov qauv sab hauv ntawm analog multimeter yog qhov yooj yim, yog li nws muaj tus nqi qis dua, kev ua haujlwm tsawg dua, kev saib xyuas yooj yim, thiab muaj zog overcurrent thiab overvoltage peev xwm. Cov multimeter digital siv ntau yam oscillation, amplification, zaus faib, kev tiv thaiv thiab lwm yam circuits sab hauv, yog li nws muaj ntau yam haujlwm, xws li ntsuas kub. zaus (nyob rau hauv ib qho qis), capacitance, inductance, los yog lub teeb liab generator thiab lwm yam. Txij li thaum cov qauv sab hauv feem ntau siv cov kev sib txuas ua ke, lub peev xwm tshaj dhau yog qhov tsis zoo, thiab feem ntau nws nyuaj rau kho tom qab kev puas tsuaj.
Cov zis voltage ntawm tus pointer multimeter yog siab thiab tam sim no kuj loj (piv txwv li, MF-500* 1 ohm range muaj qhov siab tshaj plaws ntawm 100 mA), uas tuaj yeem kuaj tau yooj yim thyristors, lub teeb-emitting diodes, thiab lwm yam. Ib qho digital multimeter, ntawm qhov tod tes, muaj qhov tso zis qis dua (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, lub teeb-emitting diodes, thiab lwm yam).
