Kev sib piv ntawm qhov zoo thiab qhov tsis zoo ntawm cov multimeters zoo tib yam thiab digital multimeters:
Analog thiab digital multimeters muaj lawv tus kheej qhov zoo thiab qhov tsis zoo.
Tus pointer multimeter yog qhov ntsuas tus nqi nruab nrab, uas muaj qhov ntsuas qhov xav tau thiab pom kev nyeem ntawv. (Tus nqi nyeem ntawv dav dav yog ze ze rau lub pointer viav vias lub kaum sab xis, yog li nws yog qhov yooj yim heev).
Digital multimeters yog cov ntsuas ntsuas tam sim no. Nws yuav siv ib qho piv txwv 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 zoo sib xws, tsis zoo ib yam, uas tsis yooj yim npaum li tus taw tes rau kev nyeem cov txiaj ntsig. Analog multimeters feem ntau tsis muaj lub suab nrov sab hauv, yog li kev ua haujlwm sab hauv me me.
Kev tiv thaiv sab hauv ntawm cov digital multimeter tuaj yeem loj heev vim kev siv sab hauv ntawm kev ua haujlwm amplifier Circuit Court, feem ntau 1M ohms lossis ntau dua. (piv txwv li qhov siab dua tuaj yeem tau txais). Qhov no ua rau muaj kev cuam tshuam tsawg dua rau hauv Circuit Court hauv kev sim thiab ntsuas qhov tseeb dua.
The pointer-type multimeter uses discrete components to form a shunt and voltage divider circuit due to its small internal resistance. So the frequency characteristics are not uniform (relative to digital), and the frequency characteristics of digital multimeters are relatively better. The internal structure of the pointer multimeter is simple, so the cost is lower, the function is less, the maintenance is simple, and the overcurrent and overvoltage capability is strong.
Digital multimeter siv ntau yam oscillation, amplification, zaus division tiv thaiv thiab lwm yam circuits, yog li nws muaj ntau yam haujlwm. Piv txwv li, nws tuaj yeem ntsuas qhov kub thiab txias, zaus (hauv qhov qis), capacitance, inductance, ua lub teeb liab generator thiab lwm yam.
Cov multimeter digital muaj peev xwm ua tsis tau zoo vim yog cov qauv sab hauv ntawm ntau lub hom phiaj kev sib txuas, thiab feem ntau nws nyuaj rau kho tom qab kev puas tsuaj. DMMs muaj cov zis voltages tsawg (feem ntau tsis ntau tshaj 1 volt). Nws tsis yooj yim rau kev sim qee yam khoom siv nrog cov yam ntxwv tshwj xeeb (xws li thyristor, lub teeb-emitting diode, thiab lwm yam). Cov zis voltage ntawm tus pointer multimeter yog siab dua. Tam sim no tseem loj, uas tuaj yeem kuaj tau yooj yim thyristors, lub teeb-emitting diodes, thiab lwm yam.
Ib qho analog multimeter yuav tsum tau siv rau cov pib tshiab, thiab ob lub ntsuas yuav tsum tau siv rau cov tsis pib.
