Lub spectrum analyzeryog lub cuab yeej muaj zog rau kev ntsuas suab nrov. Feem ntau, spectrum analyzers tuaj yeem tso saib qhov kev sib raug zoo ntawm lub zog (lossis voltage) thiab zaus, uas zoo ib yam li lub suab nrov spectral density nkhaus. Qhov tseeb, qee qhov spectrum analyzers muaj hom kev ua haujlwm tshwj xeeb uas tso cai rau kev ntsuas cov txiaj ntsig tau tso tawm ncaj qha hauv spectral density units (ie nV / rt-Hz). Hauv lwm qhov xwm txheej, cov txiaj ntsig ntsuas yuav tsum tau muab sib npaug los ntawm qhov kho kom raug hloov pauv cov ntsuas ntsuas rau hauv spectral density units.
spectrum analyzers, zoo lioscilloscopes, yog ob qho tib si digital thiab analog. Ib txoj hauv kev los tsim cov spectral nkhaus los ntawm ib qho analogspectrum analyzeryog los cheb ib band-pass lim ntawm ntau zaus thaum plotting qhov ntsuas qhov tso zis ntawm lim. Lwm txoj hauv kev yog siv superheterodyne txais tos, uas ua haujlwm scanning ntawm lub zos oscillator ntawm ntau zaus. Txawm li cas los xij, digital spectrum analyzers siv ceev Fourier transforms los tsim cov spectrum (feem ntau siv nrog superheterodyne txais thev naus laus zis).
Txawm hais tias cov spectrum analyzers siv yog cov qauv sib txawv, qee qhov tseem ceeb tseem yuav tsum tau xav txog. Qhov pib thiab nres frequencies qhia qhov ntau zaus uas cov lim bandpass raug tshuaj xyuas. Qhov kev daws teeb meem bandwidth yog qhov dav ntawm bandpass lim scanned nyob rau hauv ntau zaus. Txo qhov kev daws teeb meem bandwidth yuav ua rau kom muaj peev xwm ntawm spectrum analyzer los ua cov teeb liab ntawm cov zaus sib txawv thaum ncua sij hawm scan. Daim duab 1 qhia txog kev khiav hauj lwm ntawm lub scan lim. Daim duab 2 thiab daim duab 3 qhia cov txiaj ntsig tau txais thaum tib lub spectrum analyzer siv ntau qhov kev daws teeb meem bandwidths. Nyob rau hauv daim duab 2, vim hais tias qhov kev daws teeb meem bandwidth yog teem me me, discrete zaus Cheebtsam (piv txwv li, 150 Hz) yog ua kom zoo. Ntawm qhov tod tes, nyob rau hauv daim duab 3, lub discrete zaus tivthaiv (piv txwv li, 1200 Hz) tsis tau ua kom zoo vim hais tias qhov kev daws teeb meem bandwidth yog teem kom loj heev.
Daim duab 1.
Daim duab 2.
Daim duab 3.
