Kev sib piv ntawm cov oscilloscopes thiab analog oscilloscopes
Cov yam ntxwv zaus ntawm ib qho analog oscilloscope yog txiav txim los ntawm ntsug amplifier thiab cathode oscilloscope raj. Hauv xyoo 1980s, kev ua digital thiab microprocessors tau nkag mus rau hauv oscilloscopes, thiab cov oscilloscopes tau tshwm sim. Niaj hnub no, analog oscilloscopes hu ua analog real-time oscilloscopes (ART), thiab cov oscilloscopes yog hu ua digital storage oscilloscopes (DSO).
ART yuav tsum tau amplifiers thiab cathode ray oscilloscope raj uas sib haum nrog lub bandwidth. Raws li qhov ntau zaus, cov txheej txheem yuav tsum tau ua rau cathode ray oscilloscope raj yog nruj, tus nqi nce, thiab cov hlab ntsha muaj nyob. DSO tsuas yog xav tau lub siab ceev A/D converter uas haum rau bandwidth. Rau lwm qhov kev hloov pauv, cov duab peb sab tsis tuaj yeem pom; lub waveform cia muaj peev xwm tsis txaus, thiab lub waveform tsis tuaj yeem ua tiav, thiab lwm yam.
Tam sim no, qhov tsis txaus ntawm DSO tau dhau los ua qhov tseem ceeb, tab sis tsis yog txhua qhov kev ua tau zoo tau tshwm sim hauv tib lub oscilloscope. Ntawd yog, txhua DSO yuav muaj qee yam yam ntxwv thiab qee qhov tsis txaus. Koj yuav tsum xyuam xim rau kev sib piv thaum xaiv tus qauv. Qee cov qauv ntawm DSO muaj tib lub waveform hloov tshiab raws li ART, tab sis qee cov qauv ntawm DSO tsis ua. Ib hom DSO muaj 3D duab tso saib muaj peev xwm ntawm ART, tab sis feem ntau DSOs tsis muaj peev xwm no. Lub sijhawm tiag tiag bandwidth ntawm DSOs feem ntau yog tib yam li ib zaug txhaj tshuaj bandwidth, tab sis kuj tseem muaj DSOs uas tsuas lav lub sijhawm bandwidth.
Cov DSO tau hais los saum no txhua tus muaj A/D converters thiab microprocessors. Nyob rau hauv txoj kev no, ntxiv daim npav ntsaws rau hauv PC kuj tseem tuaj yeem tsim DSO, tab sis feem ntau tus nqi qis dua, cov haujlwm tsawg dua, thiab tus nqi pheej yig. Tseem muaj DSO modules siv VXI tsheb npav thiab khib-mounted DSO plug-ins.
Lub DSO lub cim xeeb yog qhov thib ob tseem ceeb tshaj plaws ntawm oscilloscope tom qab A / D converter. Nws khaws cov qauv ntawm cov teeb liab ntsuas rau tom ntej D / A converters los kho cov waveform. Lub peev xwm cia tam sim no tuaj yeem ncav cuag ntau dua 1M.
Ordinary DSO muaj 8-ntsis ntsug kev daws teeb meem, uas yog, muaj 256 cov qauv ib qho scan, xav tau 256 cov ntsiab lus cia, sib npaug rau 256 bytes. Yog tias qhov kev daws teeb meem nce ntxiv thiab kab rov tav axis nthuav dav 10 zaug, nws yog sib npaug rau 20K bytes; ntsug axis kuj tau nthuav dav 10 zaug, uas yog sib npaug rau 40K bytes. Nws tuaj yeem pom tias DSO yuav tsum yog tsawg kawg yog 2K bytes, thiab qhov nruab nrab DSO yuav tsum ntau dua 40K bytes. Yog tias koj xav sau 10 npaug ntawm cov ntawv saum toj no, nws yuav xav tau tsawg kawg 400K bytes. Yog li ntawd, lub peev xwm khaws cia yog qhov tseem ceeb.
Nyob rau hauv lem, lub peev xwm cia kuj cuam tshuam rau scanning ceev. Piv txwv li, yog tias lub cim xeeb nrog tsuas yog 50K cov ntsiab lus ntawm ib qho kev luam theej duab 100μs cov ntaub ntawv, lub sijhawm piv txwv yog 2ns. Lub sijhawm no, tus nqi piv txwv yog sib npaug rau 500MS / s. Muab xam raws li qhov piv txwv tus nqi sib npaug 4 npaug ntawm bandwidth, real-time Bandwidth yog sib npaug rau 125MHz. Pom tseeb, yog tias tus lej ntsuas yuav tsum tau nce mus rau 1000MS / s, sau 100μs ntawm cov ntaub ntawv yuav tsum tau 100K cov ntsiab lus ntawm kev nco.
Txhawm rau khaws ib daim duab tiav, xav tias qhov loj ntawm pixel yog 1024 × 512=0.5M cov khoom, plaub daim duab yuav tsum tau 2M cov khoom cia. Kev khaws cia ntxiv kuj tseem yuav tsum muaj nyob rau hauv FFT tsom xam los sib piv cov khoom ntawm cov waveform tshiab nrog rau cov ntaub ntawv siv Waveforms lossis khaws cov waveforms rau kev sib piv. Txhawm rau pab txhawb nqa waveform cia, qee qhov DSOs kuj tseem muab cov disks lossis hard disks rau cov ntaub ntawv kaw.
