Tsis ntev los no, ntau yam tau hloov pauv rau qhov zoo dua hauv kev ua lag luam ntawm cov cuab yeej ntsuas. Compact digital multimeters tau tshwm sim ntawm kev muag khoom, tsim los ntsuas tam sim no, voltage, tsis kam, uas ua haujlwm nyob rau hauv ntau yam. Ntau ntawm lawv tau nruab nrog cov haujlwm ntxiv, piv txwv li, lawv tuaj yeem ua haujlwm hauv "kev txuas ntxiv" hom ntawm Circuit Court lossis ntsuas cov coefficients ntawm transistors. Lawv invariably suav nrog digital voltmeter. Kev ntsuas hluav taws xob yog theem tseem ceeb hauv kev txhim kho, kho lossis hloov kho cov khoom siv hluav taws xob ntawm txhua qhov nyuaj.
Muaj lub tshuab hluav taws xob digital hauv koj lub tsev sim yog qhov tseem ceeb rau ntau yam. Cov khoom siv zoo li no yog compact thiab txhim khu kev qha hauv kev ua haujlwm. Ntxiv mus, tsis muaj kev ntsuas, kev ua haujlwm ntawm lub xov tooj cua amateur yog tsis yooj yim sua, thiab ntau nyob ntawm qhov zoo ntawm kev ntsuas tau ua. Qhov sib txawv tseem ceeb ntawm cov cuab yeej no los ntawm analog "compatriots" yog qhov ua haujlwm siab sab hauv, uas yog tus lav ntawm kev nyeem kom raug thaum ua haujlwm hauv cov hluav taws xob qis tam sim no. DC digital voltmeter tuaj yeem ntsuas qhov tso zis hluav taws xobmicrocircuits thiab tsis "squander" hluav taws xob Circuit Court. Qhov no yog qhov tseeb tshwj xeeb tshaj yog thaum ua haujlwm hauv cov txheej txheem tswj circuits. Ib qho kev cuam tshuam hauv qhov no tuaj yeem txo qhov kev tswj qhov hluav taws xob thiab ua rau tag nrho cov txheej txheem ua tsis tiav. Cov khoom siv digital tsis pub dawb los ntawm qhov tsis zoo no thiab muaj kev nyab xeeb rau siv.
Tab sis tsis yog txhua yam yog "huab tsis muaj", thiab koj yuav tsum tsis txhob tso siab rau qhov tseeb hauv kev ntsuas ntsuas. Cov voltmeter digital coj tus cwj pwm tsis zoo ntawm kab thiab hauv AC circuits. Nyob rau hauv lwm yam lus, thaum sim ua ib tug ntsuas nyob rau hauv ib tug ntev hluav taws xob Circuit Court, muab ib tug me me load ntawm cov zis ntawm lub Circuit Court no, peb yuav ua tau tsis ncaj ncees lawm. Qhov no tej zaum yuav yog vim qhov siab ntawm "kev cuam tshuam" uas yog superimposed ntawm lub ntsiab teeb liab. Tsis tas li ntawd, lub digital AC voltmeter yog tsim los ua haujlwm hauv cov qauv zaus zaus thiab, thaum nws hloov, nws pib ua haujlwm nrog qhov tsis raug. Tib yam tuaj yeem hais txog kev ua haujlwm hauv circuits nrog hluav taws xob hluav taws xob, uas txawv ntawm cov duab ntawm lub sinusoid (daim duab peb sab, duab plaub, thiab lwm yam).
Cov cuab yeej taw qhia ib txwm nyob hauv qhov kev hwm no zoo dua li nws cov neeg sib tw digital. Nws muaj cov input impedance tsawg, thiab thaum ua hauj lwm nrog ib tug kab, nws yuav "sag" tag nrho cov pickups thiab qhia lub tiag tiag voltage nyob rau hauv lub network. Raws li kev ntsuas hluav taws xob ntawm qhov tsis yog tus qauv, lub cuab yeej tsis paub tias tsib caug Hertz yog dab tsi. Nws yuav qhia qhov nruab nrab ntsuas tus nqi.
Raws li cov lus saum toj no, peb tuaj yeem kos qee qhov kev txiav txim siab. Lub voltmeter digital yog qhov tseem ceeb hauv chav kuaj hauv tsev, piv txwv li, thaum kho hluav taws xob circuits. Cov cuab yeej no ua tau zoo tshaj plaws hauv luv luv DC circuits.
Qhov kev xaiv zoo tshaj plaws yog muab koj chav kuaj nrog ntau hom ntsuas ntsuas, yog li hais, "rau txhua lub sijhawm". Hauv qhov no, koj yuav npaj tau zoo thiab yuav daws tau txhua yam, txawm tias nyuaj heev, ua haujlwm.
