Qhov sib txawv ntawm analogue thiab digital multimeters
Analog Multimeter: Ob qho analog thiab digital multimeters muaj lawv tus kheej qhov zoo thiab qhov tsis zoo. Analogue multimeter yog ib qho ntsuas nruab nrab nrog qhov kev nyeem ntawv zoo thiab muaj txiaj ntsig. (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). Digital multimeter yog ib qho cuab yeej tam sim ntawd. Nws yuav siv ib qho piv txwv txhua 0.3 vib nas this los tso saib cov txiaj ntsig ntsuas. Qee zaum cov txiaj ntsig ntawm txhua qhov piv txwv tsuas yog zoo sib xws, tsis zoo ib yam, uas tsis yooj yim npaum li tus taw tes rau kev nyeem cov txiaj ntsig. Pointer multimeters feem ntau tsis muaj lub suab nrov sab hauv, yog li qhov kev tiv thaiv sab hauv me me, thiab DC voltage rhiab heev yog 100 kΩ / V. DC voltage rhiab heev yog 20 kΩ / V. Vim hais tias cov digital multimeter siv lub tshuab hluav taws xob ua haujlwm sab hauv, qhov kev tiv thaiv sab hauv tuaj yeem ua tau loj heev, feem ntau 1M ohm lossis ntau dua. (Qhov ntawd yog, siab dua tuaj yeem tau txais).
Qhov no ua rau qhov cuam tshuam ntawm Circuit Court nyob rau hauv 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. Digital multimeter siv ntau yam oscillation, amplification, zaus division tiv thaiv thiab lwm yam circuits sab hauv, yog li nws muaj ntau yam haujlwm. Piv txwv li, nws tuaj yeem ntsuas qhov kub thiab txias, zaus (nyob rau hauv qhov qis dua), capacitance, inductance, ua lub teeb liab generator, thiab lwm yam. Digital multimeters muaj peev xwm overload tsis zoo vim lawv cov qauv siv hauv kev sib xyaw ua ke. (Txawm li cas los xij, qee qhov tam sim no muaj kev hloov pauv tsis siv neeg, kev tiv thaiv tsis siv neeg, thiab lwm yam, tab sis lawv nyuaj rau siv.) Lawv feem ntau tsis yooj yim kho tom qab kev puas tsuaj. Digital multimeters muaj qhov tso zis tsawg voltages (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 thyristors, lub teeb-emitting diodes, thiab lwm yam). Pointer multimeters muaj qhov tso zis ntau dua (10.5 volts, 12 volts, thiab lwm yam). Cov tam sim no kuj loj (piv txwv li, MF-500* 1 ohm ntau yam muaj qhov siab tshaj plaws ntawm 100 mA), uas tuaj yeem kuaj tau yooj yim thyristors, lub teeb-emitting diodes, thiab lwm yam. Cov pib tshiab yuav tsum siv analog multimeter, thiab Cov neeg tsis paub pib yuav tsum siv ob lub cuab yeej.
Kev ntsuas hluav taws xob yog ib lub voj voog siv los hloov ntau yam khoom ntsuas mus rau hauv me me DC tam sim no haum rau kev ntsuas ntsuas. Nws yog tsim los ntawm resistors, semiconductor Cheebtsam thiab roj teeb.
Nws tuaj yeem hloov pauv ntau yam khoom ntsuas (xws li tam sim no, voltage, tsis kam, thiab lwm yam) thiab ntau qhov sib txawv rau hauv qee qhov me me DC tam sim no tom qab ua haujlwm ntau (xws li rectification, shunting, voltage division, thiab lwm yam). Lub taub hau meter yog siv rau kev ntsuas.
hloov pauv hloov
Nws txoj haujlwm yog xaiv cov kab ntsuas ntau yam kom tau raws li qhov yuav tsum tau ntsuas ntawm ntau hom thiab ntau yam sib txawv. Feem ntau muaj ob qhov hloov pauv hloov pauv, txhua tus cim nrog lub zog sib txawv thiab ntau yam.
