Spectrum Analyzers ua haujlwm li cas (2)
1. Attenuator
Tso lub attenuator rau hauv RF input txoj kev broadens lub dynamic ntau yam ntawm cov tswv yim teeb liab theem los yog ntxiv kev tiv thaiv input ntxiv rau lub spectrum analyzer.
Lub attenuator txwv cov theem teeb liab los ntawm qhov sib tov (RF nruab nrab) mus rau ib qho kev ntsuas, uas yuav ua rau kev ntsuas tsis raug lossis lub suab nrov nrov yog tias cov teeb liab tawm tswv yim tshaj li qib siv. Qhov no yog vim li cas qee cov spectrum analyzers sau cov cuab yeej tshwj xeeb rau cov teeb liab tshwj xeeb, suav nrog cov teeb liab tshwj xeeb hauv cov khoom sib tov.
2. Kev daws teeb meem lim
Thaum lub teeb liab input zaus hloov mus rau qhov tsawg zaus band thiab lim mus rau hauv kev kuaj pom thiab tso saib, ib qho RBW (Resolution Bandwidth) lim yog siv txhawm rau paub qhov txawv cov cim nrog ze zaus.
RBW lim sib txawv li cas ntawm ob lub cim ntawm qhov sib txawv bandwidths? Ob qhov sib npaug amplitude signals yog lim los ntawm ob lub lim RBW. Qhov kev daws teeb meem ntawm RBW1 yog qhov phem dua li ntawm RBW2. Thaum dhau los ntawm qhov nqaim RBW1 lim, ob lub cim qhia tau meej meej, tab sis thaum dhau los ntawm qhov dav RBW2 lim, qhov tshwm sim tsis zoo li RBW1. Kev kwv yees, yog tias RBW2 muaj qhov kev daws teeb meem dav dua, peb yuav txawm tias qhov tshwm sim yuam kev rau lub teeb liab. Qhov no tshwm sim thaum lub frequencies ntawm ob lub teeb liab nyob ze heev. Lwm qhov xwm txheej yog tias thaum lub amplitudes ntawm ob lub teeb liab sib txawv heev, RBW1 tseem tuaj yeem ntes cov teeb liab me me. Tab sis RBW2 tsis tuaj yeem, raws li qhia hauv daim duab hauv qab no, yog li cov ntxaij lim dej no tseem hu ua cov ntxaij lim dej daws teeb meem.
3. Geophone
Tom qab RBW filtering, tus ntes tuaj yeem ntes lub zog thiab hloov mus rau hauv DC voltage. Lub tsev tso saib kos cov spectral faib siv DC voltage.
4. Video lim
Ua ntej DC voltage nkag mus rau hauv chav tsev, lub suab nrov tsim los ntawm lub tshuab ntes yuav tsum tau compressed. Cov lim no yog hu ua video lim, thiab nws cov bandwidth hu ua VBW.
Cov ntxaij lim dej video kuj ua raws li cov ntawv lim thiab VBW muaj qhov cuam tshuam rau cov khoom tso tawm. Yog hais tias lub teeb liab nyob rau hauv kev xeem dhau los ntawm ob lub VBW lim, qhov twg VBW1 yog me dua VBW2, qhov tshwm sim qhia tau hais tias lub suab nrov pem teb ntawm VBW2 yog loj dua li ntawm VBW1, nyob rau hauv lwm yam lus, lub video lim nruab nrab lub suab nrov pem teb. Txawm li cas los xij, nws yuav tsum raug sau tseg tias lub suab nrov hauv pem teb tsis tau hloov pauv, VBW lim tsuas yog nruab nrab ntawm cov suab nrov thiab tsis cuam tshuam rau tag nrho cov amplitude ntawm lub teeb liab suab nrov hauv pem teb.
5. Lub sijhawm luam theej duab
Cov ntsiab lus saum toj no qhia txog cov qauv ntawm cov spectrum analyzer, thiab kuj tau piav qhia txog RBW thiab VBW kom ntxaws. Feem ntau, cheb lub sij hawm yog inversely proportional rau zaus daws teeb meem ntawm ib tug spectrum analyzer. Lub sijhawm scan sai dua, qhov kev daws teeb meem qis dua. Lub sijhawm scan qeeb, qhov kev daws teeb meem siab dua. Yog li ntawd, yog xaiv ib tug nqaim RBW los yog VBW, lub sij hawm los tso saib lub teeb liab yuav ntev dua. Qhov no txhais tau hais tias qhov nqaim ntawm RBW thiab VBW, lub sijhawm scan ntev dua. Rau RBW / VBW cheb lub sij hawm, feem ntau cov spectrum analyzers muaj tsis siv neeg thiab phau ntawv xaiv hom. Nws pib hom lag luam tawm bandwidth, RBW, VBW, thiab lub sijhawm luam theej duab, thiab feem ntau tau txais kev sib xyaw zoo tshaj plaws.
Peb lub tuam txhab feem ntau yog muab thiab daws cov ntse wireless saib xyuas thiab tswj cov kev daws teeb meem nrog tus nqi qis, kev siv tshuab siab, thiab kev sib txuas lus ruaj khov. Peb pab pawg tswj hwm tau nyob hauv kev lag luam kev lag luam no rau ntau tshaj 20 xyoo. Yog tias koj txaus siab rau IoT-raws li cov chaw taws teeb tswj, IoT-raws li kev tswj hwm lub zog, hluav taws xob hluav taws xob them pawg, thiab lwm yam. Thov koj xav tiv tauj peb.
