Peb lub ntsiab lus tseem ceeb ntawm ib qho oscilloscope: bandwidth, sampling rate, thiab cia qhov tob
Bandwidth, sampling rate thiab cia qhov tob yog peb lub cim tseem ceeb ntawm cov oscilloscopes. Piv nrog rau cov engineers paub txog thiab tseem ceeb ntawm oscilloscope bandwidth, sampling tus nqi thiab cia qhov tob yog feem ntau overlooked nyob rau hauv kev xaiv, kev ntsuam xyuas thiab kev ntsuam xyuas ntawm oscilloscopes. Lub hom phiaj ntawm tsab xov xwm no yog los pab cov engineers kom nkag siab zoo txog cov yam ntxwv tseem ceeb ntawm ob qhov ntsuas ntawm qhov ntsuas qhov ntsuas thiab qhov tob ntawm qhov chaw khaws cia thiab lawv cov kev cuam tshuam rau qhov kev sim tiag tiag los ntawm luv luv qhia txog cov kev xav ntawm cov qauv ntsuas thiab qhov tob ntawm kev khaws cia ua ke nrog cov kev siv ntau. Nws kuj tseem pab peb nkag siab txog kev lag luam tawm thaum xaiv oscilloscope thiab tsim kom muaj lub tswv yim zoo ntawm kev siv oscilloscope.
Ua ntej peb pib nkag siab txog cov ntsiab lus cuam tshuam ntawm kev ua piv txwv thiab kev cia khoom, cia peb saib seb lub chaw khaws khoom digital oscilloscope ua haujlwm li cas.
Lub input voltage teeb liab raug xa mus rau pem hauv ntej-kawg amplifier los ntawm lub coupling Circuit Court, thiab pem hauv ntej-kawg amplifier amplifies lub teeb liab los txhim kho qhov rhiab heev thiab dynamic ntau yam ntawm oscilloscope. Lub teeb liab tso zis los ntawm lub amplifier yog kuaj los ntawm cov qauv / tuav Circuit Court thiab digitized los ntawm A / D converter. Tom qab A / D hloov dua siab tshiab, lub teeb liab dhau los ua daim ntawv digital thiab khaws cia hauv lub cim xeeb. Lub microprocessor ua cov teeb liab digitized waveform hauv lub cim xeeb. Cov txheej txheem sib xws yog ua thiab tso tawm ntawm cov zaub. Qhov no yog li cas lub chaw khaws khoom digital oscilloscope ua haujlwm.
Sampling, tus nqi piv txwv
Peb paub tias cov khoos phis tawj tsuas tuaj yeem ua cov cim tsis sib xws. Qhov teeb meem tseem ceeb uas tau ntsib tom qab lub teeb liab analog voltage nkag mus rau oscilloscope yog digitization (analog / digital hloov dua siab tshiab) ntawm cov teeb liab txuas ntxiv. Feem ntau, cov txheej txheem los ntawm cov teeb liab txuas ntxiv mus rau cov teeb liab tsis sib xws yog hu ua sampling. Cov cim tsis tu ncua yuav tsum tau kuaj thiab ntsuas ua ntej lawv tuaj yeem ua tiav los ntawm cov khoos phis tawj. Yog li, piv txwv li yog lub hauv paus rau kev xam waveform thiab tsom xam los ntawm cov oscilloscopes. Los ntawm kev ntsuas qhov voltage amplitude ntawm lub waveform ntawm qhov sib npaug ntawm lub sijhawm sib npaug thiab hloov qhov hluav taws xob rau hauv cov ntaub ntawv digital uas sawv cev los ntawm yim-ntsis binary code, qhov no yog qhov piv txwv ntawm lub digital cia oscilloscope. Qhov me me ntawm lub sij hawm luv luv ntawm cov qauv voltages, qhov ze dua qhov reconstructed waveform yog rau qhov qub teeb liab. Tus nqi piv txwv yog lub sijhawm piv txwv. Piv txwv li, yog tias qhov piv txwv ntawm oscilloscope yog 10G zaug ib ob (10GSa / s), nws txhais tau hais tias ib qho piv txwv raug coj txhua 100ps.
