Lub multimeter tsim nyog yuav tsum tau siv rau kev ntsuas tsawg zaus.
Feem ntau niaj hnub multimeters tuaj yeem ntsuas AC cov cim nrog zaus tsawg li 20Hz. Txawm li cas los xij, qee qhov kev siv yuav tsum ntsuas qhov qis dua cov cim. Txhawm rau ua qhov ntsuas no, koj yuav tsum xaiv lub multimeter txoj cai thiab teeb tsa nws kom tsim nyog. Xav txog cov piv txwv hauv qab no:
Lub Agilent 34410A thiab 34411A multimeters siv cov thev naus laus zis thev naus laus zis rau qhov tseeb RMS ntsuas mus txog 3 Hz. Nws txhim kho lub sijhawm daws teeb meem rau 2.5s hauv lub lim qeeb los ntawm txoj kev digital. Rau kev ntsuas, koj yuav tsum xyuam xim rau:
1. Nws yog ib qho tseem ceeb heev uas yuav tau teem lub AC lim kom raug. Cov lim dej yog siv los ua kom du cov zis ntawm rms converter. Ntawm cov zaus qis dua 20Hz, qhov teeb tsa raug yog LOW. Thaum lub lim lim LOW tau teeb tsa, 2.5s ncua yog muab tso rau kom ntseeg tau tias kev ruaj ntseg ntawm multimeter. Teem lub lim qis nrog cov lus txib hauv qab no.
Voltage: AC: BandwidthMIN
2. Yog tias koj paub qhov theem ntawm lub teeb liab yuav tsum ntsuas, koj yuav tsum teeb tsa cov ntawv qhia ntau yam los pab kom ntsuas qhov ntsuas. Lub sij hawm teem caij ntev dua rau txhua qhov ntsuas qhov tsawg zaus yuav qeeb autoranging loj.
Peb pom zoo kom koj teem caij phau ntawv.
3. 34401A siv DC blocking capacitor los thaiv lub ACRMS converter los ntsuas DC teeb liab. Qhov no tso cai rau ntau yam siv los ntawm multimeter los ntsuas AC tivthaiv. Thaum ntsuas cov peev txheej nrog cov zis siab impedance, nws yog ib qho tsim nyog yuav tsum tso sijhawm txaus rau DC thaiv lub capacitor kom ruaj khov. Teem sijhawm tsis cuam tshuam los ntawm qhov zaus ntawm AC teeb liab, tab sis cuam tshuam los ntawm kev hloov pauv hauv DC teeb liab.
Agilent 3458A muaj peb txoj hauv kev los ntsuas ACRMS voltage; nws ib txhij sampling hom tuaj yeem ntsuas cov teeb liab mus rau 1Hz. Txhawm rau teeb tsa lub multimeter rau kev ntsuas qis zaus:
1. Xaiv hom qauv synchronous:
SET ACV: SYNC
2. Thaum koj siv lub synchronous sampling hom, rau lub ACV thiab ACDCV zog, lub input teeb liab yog DC ua ke. Hauv ACV muaj nuj nqi, DC tivthaiv yog lej rho tawm los ntawm kev nyeem ntawv. Qhov no yog ib qho tseem ceeb rau kev txiav txim siab vim hais tias ua ke AC thiab DC voltage theem yuav tsim ib tug overload mob txawm tias AC voltage nws tus kheej tsis overloaded.
3. Kev xaiv qhov tsim nyog tuaj yeem ua kom qhov ntsuas tau nrawm dua, vim tias thaum koj ntsuas cov cim qis, qhov tsis siv neeg ntau yam yuav ua rau qeeb.
4. Yuav kom ua piv txwv lub waveform, lub multimeter yuav tsum tau txiav txim siab lub sij hawm teeb liab. Siv cov lus txib ACBAND los txiav txim seb tus nqi ncua. Yog tias koj tsis siv ACBAND hais kom ua, lub multimeter yuav nres ua ntej lub waveform rov ua dua.
5. Lub synchronous sampling hom siv qib los ua kom lub teeb liab synchronous. Txawm li cas los xij, lub suab nrov ntawm lub teeb liab tawm tswv yim yuav ua rau muaj qhov tsis tseeb, ua rau kev nyeem ntawv tsis raug. Nws yog ib qho tseem ceeb uas yuav tau xaiv ib theem uas muab ib qho kev txhim khu kev qha qhov chaw. Piv txwv li, kom tsis txhob muaj lub ncov ntawm sine yoj, vim hais tias lub teeb liab hloov maj mam, tab sis lub suab nrov tuaj yeem ua rau muaj qhov tsis tseeb.
6. Yuav kom tau txais cov kev nyeem ntawv zoo tshaj plaws, xyuas kom koj qhov chaw nyob ib puag ncig yog hluav taws xob "tsim" thiab siv cov ntaub thaiv thaiv kev ntsuas. Pab kom qib filtering, LFILTERON, kom txo tau lub suab nrov.
Txhawm rau teeb tsa 34401A, koj tuaj yeem siv tib txoj kev teeb tsa li 34410A thiab 34411A. 34401a ua
Siv ib qho analog circuit nrog DC blocking capacitor los hloov rms voltage. Nws ntsuas cov teeb liab mus rau 3 Hz. Txhawm rau ua tiav cov txiaj ntsig kev ntsuas, xaiv cov lim dej tsawg, siv phau ntawv sib txawv, thiab xyuas kom meej tias ntau yam DC tsis ncaj ncees lawm. Thaum koj siv lub lim qeeb, qhov ncua sij hawm ntawm 7s yog tso, yog li ua kom muaj kev ruaj ntseg ntawm multimeter.
