Pointer multimeter thiab digital multimeter txhua tus muaj lawv tus kheej qhov zoo thiab qhov tsis zoo. Hauv qab no yog ib qho kev sib piv.
Kev sib piv ntawm Pointer Multimeters thiab Digital Multimeters: Pointer thiab Digital Multimeters muaj lawv tus kheej qhov zoo thiab qhov tsis zoo. Ib tug pointer multimeter yog ib qho nruab nrab hom ntsuas nrog intuitive thiab pom kev nyeem ntawv qhia. (Feem ntau, tus nqi nyeem ntawv yog ze ze rau lub kaum sab xis ntawm lub pointer viav vias, yog li nws yog intuitive heev).
Ib qho digital multimeter yog qhov ntsuas ntsuas tam sim. Nws siv cov qauv coj mus kuaj txhua txhua 0.3 vib nas this los tso saib cov txiaj ntsig ntsuas. Qee zaum, txhua qhov kev ua piv txwv tsuas yog zoo sib xws thiab tsis zoo ib yam, uas tsis yooj yim rau kev nyeem cov txiaj ntsig raws li hom pointer.
Ib tug pointer multimeter feem ntau tsis muaj lub amplifier nyob rau hauv, yog li lub internal kuj yog me me.
Vim yog kev siv lub tshuab hluav taws xob ua haujlwm hauv lub tshuab hluav taws xob digital, qhov kev tiv thaiv sab hauv tuaj yeem loj, feem ntau ntawm 1M ohms lossis ntau dua. (piv txwv li qhov siab dua tuaj yeem tau txais). Qhov no tso cai rau kom muaj kev cuam tshuam tsawg dua ntawm qhov ntsuas hluav taws xob thiab ntsuas qhov tseeb dua.
Vim yog qhov me me sab hauv tsis kam thiab siv cov khoom sib cais los ua ib qho shunt thiab voltage divider circuit, pointer type multimeters feem ntau siv. Yog li tus cwj pwm zaus tsis sib xws (xws li digital), thaum tus cwj pwm zaus ntawm tus pointer multimeter kuj zoo dua.
Cov qauv sab hauv ntawm lub pointer hom 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. Digital multimeter siv ntau yam oscillation, amplification, zaus division tiv thaiv circuits sab hauv, yog li nws muaj ntau yam haujlwm. 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.
Vim yog kev siv cov kev sib xyaw ua ke hauv cov qauv hauv digital multimeters, lawv cov peev txheej dhau los tsis zoo (txawm tias qee qhov tam sim no tuaj yeem hloov lub zog, tiv thaiv lawv tus kheej, thiab lwm yam, tab sis lawv siv ntau dua), thiab lawv feem ntau tsis yooj yim rau 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, lub teeb-emitting diodes, thiab lwm yam).
Cov zis hluav taws xob ntawm lub pointer multimeter yog qhov siab, xws li 10.5 volts, 12 volts, thiab lwm yam. Tam sim no kuj loj (xws li MF-500 * 1 ohm ntau yam nrog qhov siab tshaj plaws ntawm 100 milliamperes), uas tuaj yeem pab kev sim ntawm thyristors, lub teeb-emitting diodes, thiab lwm yam.
Xaiv tus pointer thiab digital meter
1. Kev nyeem ntawv qhov tseeb ntawm lub ntsuas ntsuas ntsuas yog qhov tsis zoo, tab sis cov txheej txheem ntawm pointer oscillation yog qhov nkag siab zoo, thiab qhov amplitude ntawm nws cov oscillation ceev tuaj yeem qee zaum ua raws li qhov ntsuas qhov loj me (xws li me ntsis jitter ntawm TV cov ntaub ntawv tsheb npav (SDL)). thaum lub sij hawm xa cov ntaub ntawv); Kev nyeem ntawv ntawm lub ntsuas hluav taws xob yog qhov nkag siab, tab sis cov txheej txheem hloov cov lej zoo li ntxhov thiab tsis yooj yim saib.
2. Feem ntau muaj ob lub roj teeb hauv lub ntsuas ntsuas ntsuas, ib qho muaj qhov tsis tshua muaj hluav taws xob ntawm 1.5V thiab lwm qhov muaj qhov hluav taws xob siab ntawm 9V lossis 15V. Tus cwj mem dub yog qhov zoo piv rau tus cwj mem liab. Lub ntsuas hluav taws xob feem ntau siv 6V lossis 9V roj teeb. Nyob rau hauv qhov kev tawm tsam, qhov tso zis tam sim no ntawm lub ntsuas ntsuas ntsuas yog qhov loj dua li ntawm cov ntsuas digital, siv R × 1 Ω iav tuaj yeem ua rau tus neeg hais lus tawm suab nrov "nyem" suab, siv R × 10k Ω iav tuaj yeem teeb tsa. Lub teeb-emitting diodes (LEDs).
3. Nyob rau hauv qhov hluav taws xob ntau, qhov kev tiv thaiv sab hauv ntawm lub ntsuas ntsuas ntsuas yog qhov me me piv rau cov ntsuas digital, thiab qhov ntsuas qhov tseeb yog qhov tsis zoo. Hauv qee qhov xwm txheej uas muaj qhov hluav taws xob siab thiab micro tam sim no, nws tseem tsis tuaj yeem ntsuas lawv qhov tseeb vim tias lawv qhov kev tiv thaiv sab hauv tuaj yeem cuam tshuam rau Circuit Court raug kuaj (piv txwv li, thaum ntsuas qhov nrawm theem voltage ntawm lub raj duab yeeb yaj kiab, ntsuas tus nqi yuav yuav qis dua tus nqi tiag). Qhov kev tiv thaiv sab hauv ntawm qhov ntsuas hluav taws xob ntawm lub ntsuas hluav taws xob yog siab heev, yam tsawg kawg ntawm megaohm theem, thiab muaj kev cuam tshuam me ntsis ntawm qhov ntsuas hluav taws xob. Tab sis cov zis impedance siab heev ua rau nws raug cuam tshuam los ntawm induced voltage, thiab cov ntaub ntawv ntsuas nyob rau hauv qee qhov chaw uas muaj zog electromagnetic cuam tshuam tej zaum yuav tsis tseeb.
4. Nyob rau hauv luv luv, pointer meters yog haum rau ntsuas analog circuits nrog kuj high tam sim no thiab voltages, xws li TV teeb thiab suab amplifiers. Cov ntsuas hluav taws xob tsim nyog rau qhov ntsuas hluav taws xob tsis tshua muaj hluav taws xob thiab ntsuas hluav taws xob tam sim no, xws li BP tshuab, xov tooj ntawm tes, thiab lwm yam. Tsis yog qhov tseeb, koj tuaj yeem xaiv lub rooj taw qhia thiab lub rooj digital raws li qhov xwm txheej.
