Lub Multimeter tsim nyog yuav tsum tau xaiv thaum ua qhov tsawg -Kev ntsuas zaus
Feem ntau niaj hnub multimeters tuaj yeem ntsuas AC cov cim nrog zaus tsawg li 20Hz. Tab sis qee qhov kev siv yuav tsum ntsuas cov cim ntawm qis zaus. Txhawm rau ua qhov kev ntsuas zoo li no, koj yuav tsum xaiv lub multimeter tsim nyog thiab teeb tsa nws kom tsim nyog. Thov saib cov piv txwv hauv qab no:
Lub Agilent 34410A thiab 34411A multimeters siv cov thev naus laus zis thev naus laus zis los ntsuas qhov tseeb RMS qhov tseem ceeb tsawg li 3Hz. Nws siv cov txheej txheem digital los ua kom lub sijhawm daws teeb meem rau 2 lossis 5 vib nas this thaum lub sijhawm lim qeeb. Txhawm rau ua qhov ntsuas kom raug, koj yuav tsum ua tib zoo saib xyuas:
1. Kev teeb tsa AC lim kom raug yog qhov tseem ceeb heev. Cov lim tau siv los ua kom cov zis ntawm qhov tseeb RMS converters. Qhov teeb tsa raug yog LOW thaum qhov zaus qis dua 20Hz. Thaum teeb tsa LOW lim, xyuas kom ruaj khov ntawm multimeter los ntawm kev ntxig qeeb ntawm 2 thiab 5 vib nas this. Siv cov lus txib hauv qab no los teeb tsa cov lim qis.
Voltage: AC: BandwidthMIN
2. Yog tias koj paub qhov siab tshaj plaws ntawm cov teeb liab ntsuas, koj yuav tsum teeb tsa phau ntawv ntau yam los pab txhawm rau ntsuas qhov ntsuas. Lub sij hawm ruaj khov ntev dua ntawm txhua qhov qis - ntsuas zaus yuav ua rau qeeb qeeb ntawm qhov tsis siv neeg.
Peb pom zoo kom koj teeb tsa phau ntawv ntau yam.
3. 34401Ib tug siv lub DC blocking capacitor los thaiv lub ACRMS converter rau ntsuas DC signals. Qhov no tso cai rau lub multimeter los ntsuas AC Cheebtsam hauv qhov muaj. Thaum ntsuas cov peev txheej nrog cov zis siab impedance, lub sijhawm txaus yuav tsum tau ua kom muaj kev ruaj ntseg ntawm DC thaiv lub capacitor. Lub sijhawm ruaj khov 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 synchronous sampling hom tuaj yeem ntsuas cov teeb liab qis li 1Hz. Txhawm rau teeb tsa lub multimeter rau qis- ntsuas zaus:
1. Xaiv synchronous sampling hom:
SETACV: SYNC
2. Thaum siv synchronous sampling hom, rau ACV thiab ACDCV zog, lub teeb liab input yog DC txuas. Thaum lub sijhawm ACV muaj nuj nqi, siv txoj hauv kev ua lej los rho tawm DC tivthaiv los ntawm kev nyeem ntawv. Qhov no yog ib qho tseem ceeb rau kev txiav txim siab vim qhov sib xyaw AC thiab DC voltage theem yuav ua rau muaj kev cuam tshuam ntau dhau, txawm tias AC voltage nws tus kheej tsis dhau.
3. Kev xaiv qhov tsim nyog tuaj yeem ua kom qhov ntsuas tau nrawm dua, vim tias cov yam ntxwv tsis siv neeg ntau tuaj yeem ua rau qeeb thaum ntsuas qis -frequency signals.
4. Rau cov qauv waveforms, ib tug multimeter yuav tsum tau txiav txim 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 ua rau lub teeb liab synchronization nrog ib theem voltage. Txawm li cas los xij, lub suab nrov ntawm lub teeb liab tawm tswv yim yuav ua rau muaj qhov tsis tseeb thiab ua rau kev nyeem tsis raug. Nws yog ib qho tseem ceeb uas yuav tau xaiv ib qib uas tuaj yeem muab cov txiaj ntsig kev ntseeg siab. Piv txwv li, kom tsis txhob muaj lub ncov ntawm sine yoj, raws li lub teeb liab hloov maj mam thiab lub suab nrov tuaj yeem ua rau tsis muaj tseeb.
6. Txhawm rau kom tau txais kev nyeem ntawv kom raug, xyuas kom meej tias ib puag ncig ib puag ncig koj yog hluav taws xob 'tsim' thiab siv cov xov hlau tiv thaiv kev ntsuas. Pab kom qib filtering LFILTERON, kom txo tau rhiab heev rau lub suab nrov.
Configuration 34401A tuaj yeem siv tib txoj kev teeb tsa raws li 34410A thiab 34411A. 34401A
Hloov cov hluav taws xob zoo siv ib qho analog circuit nrog DC blocking capacitor. Nws tuaj yeem ntsuas cov teeb liab qis li 3Hz. Txhawm rau ua tiav cov txiaj ntsig ntsuas tau, nws yog qhov yuav tsum tau xaiv qhov qis - zaus lim, siv phau ntawv ntau yam, thiab xyuas kom meej tias ntau yam DC tsis ncaj ncees lawm. Thaum koj siv lub lim qeeb, ncua sijhawm 7 vib nas this los xyuas kom meej qhov ruaj khov ntawm multimeter.
