Kev piav qhia ntawm pointer multimeter thiab digital multimeter:
Kev sib piv ntawm tus pointer multimeter thiab digital multimeter qhia tau hais tias ob leeg muaj lawv tus kheej qhov zoo thiab qhov tsis zoo.
Ib tug pointer multimeter yog ib qho nruab nrab hom ntsuas uas muaj intuitive thiab pom kev nyeem ntawv qhia. (Feem ntau, kev nyeem cov lej muaj feem cuam tshuam nrog lub kaum sab xis ntawm lub taw tes taw, yog li nws yog qhov yooj yim heev).
Ib qho digital multimeter yog qhov ntsuas tam sim no. 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 kuaj pom tsuas yog zoo sib xws thiab tsis zoo ib yam, uas tsis yooj yim rau kev nyeem cov txiaj ntsig raws li hom pointer.
Tus pointer hom multimeter feem ntau tsis muaj lub suab nrov hauv, yog li nws qhov kev tiv thaiv sab hauv me me. Piv txwv li, MF-10 qauv muaj DC voltage rhiab heev ntawm 100 kiloohms/volt. DC voltage rhiab heev ntawm MF-500 qauv yog 20 kiloohms/volt.
Vim yog kev siv lub tshuab hluav taws xob ua haujlwm sab hauv, qhov kev tiv thaiv sab hauv ntawm lub tshuab hluav taws xob digital tuaj yeem loj, feem ntau ntawm 1M ohms lossis siab dua. (piv txwv li siab dua tuaj yeem ua tiav). Qhov no tso cai rau kom muaj kev cuam tshuam tsawg dua ntawm qhov ntsuas hluav taws xob thiab ntsuas qhov tseeb dua.
Tus pointer hom multimeter, vim nws qhov me me hauv qhov tsis kam thiab siv cov khoom sib cais los ua ib qho shunt thiab voltage divider circuit. Yog li cov yam ntxwv zaus tsis sib xws (piv rau cov digital), thaum cov yam ntxwv zaus ntawm pointer hom multimeters 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, thiab 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 sab hauv, cov multimeters muaj peev xwm ua tsis tau 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 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 hom multimeter yog qhov siab, xws li 10.5 volts, 12 volts, thiab lwm yam tam sim no kuj siab (xws li MF-500 * 1 ohm, nrog rau qhov siab tshaj plaws ntawm 100 milliamperes), ua Nws yooj yim los kuaj thyristors, lub teeb-emitting diodes, thiab lwm yam.
Rau cov pib tshiab, yuav tsum siv lub pointer type multimeter, thiab rau cov tsis pib, ob hom twj paj nruag yuav tsum tau siv.
