Virtual oscilloscope Cheebtsam
Cov yam ntxwv ntawm virtual oscilloscope
Tam sim no dav siv USB interface yog siv los ua kev sib tshuam ntawm cov cuab yeej virtual thiab khoos phis tawj yooj yim dua thiab kev sib txuas lus ceev dua; ib tug high-speed analog-rau-digital conversion nti (ADC) yog siv rau high-speed sampling; lub microcontroller ua haujlwm siab yog siv rau kev tswj hwm, thiab lub cim xeeb loj loj (RAM) txuag cov ntaub ntawv hauv lub sijhawm tiag tiag, txhim kho kev ua haujlwm ntawm qhov ntsuas; siv cov lus Labview los tsim ib daim ntawv thov hauv computer, uas tuaj yeem paub cov duab waveform, nrog rau kev txheeb xyuas cov ntaub ntawv thiab kev ua haujlwm.
Cheebtsam ntawm Virtual Oscilloscope
(1) Kev yuav khoom thiab kev tswj xyuas. Nws yog lub platform kho vajtse tsim los ntawm cov khoos phis tawj thiab cov cuab yeej ntsuas kom paub txog kev sau, ntsuas, hloov pauv thiab tswj cov teeb liab.
(2) Kev txheeb xyuas thiab ua cov ntaub ntawv. Lub oscilloscope virtual ua rau siv tag nrho ntawm kev cia thiab kev ua haujlwm ntawm lub khoos phis tawj, thiab tshuaj xyuas thiab ua cov ntaub ntawv tawm tswv yim los ntawm software. Kev ua cov ntsiab lus suav nrog kev lim cov digital, cov ntaub ntawv txheeb cais, kev txheeb xyuas lej, thiab lwm yam. Los ntawm kev xav ntawm cov ntaub ntawv tsom xam, cov oscilloscopes virtual muaj peev xwm txheeb xyuas cov ntaub ntawv muaj peev xwm ntau dua li cov cuab yeej siv niaj hnub.
(3) Muab cov txiaj ntsig ntsuas. Lub oscilloscope virtual ua rau siv tag nrho cov peev txheej hauv computer, xws li cov lus qhia, nco, thiab lwm yam, los qhia thiab ntsuas qhov ntsuas tau los ntawm ntau txoj hauv kev. Nws cov ntaub ntawv tso zis muaj xws li cov ntaub ntawv nyob deb xa mus los ntawm lub tsheb npav network, luam tawm los ntawm cov khoom siv kho qhov muag thiab cov disks, thiab cov khoom tso tawm ntawm lub hard disk. Ib txoj hauv kev khaws cov ntaub ntawv thiab tso tawm nws los ntawm kev sib cuam tshuam graphical xws li lub computer screen.
Technical parameters ntawm virtual oscilloscope
Cov teeb meem uas yuav tsum tau them sai sai rau thaum siv virtual oscilloscope
Sib txawv ntawm analog bandwidth thiab digital real-time bandwidth
Bandwidth yog ib qho tseem ceeb tshaj plaws ntawm cov oscilloscope. Lub bandwidth yog tus nqi ruaj khov, thaum lub bandwidth ntawm virtual oscilloscope muaj ob hom: analog bandwidth thiab digital real-time bandwidth. Qhov siab tshaj plaws bandwidth uas lub virtual oscilloscope tuaj yeem ua tiav los ntawm kev siv cov qauv sib txuas lossis cov qauv siv thev naus laus zis rau cov cim rov ua dua yog cov digital real-time bandwidth ntawm oscilloscope. Cov digital real-time bandwidth muaj feem xyuam rau qhov siab tshaj plaws digitization zaus thiab waveform reconstruction technology factor K (digital real-time bandwidth=siab tshaj digitization rate/K), feem ntau tsis muab ncaj qha raws li qhov taw qhia. Nws tuaj yeem pom los ntawm cov ntsiab lus ntawm ob lub bandwidths tias qhov analog bandwidth tsuas yog tsim nyog rau kev ntsuas ntawm cov cim rov ua dua lub sijhawm, thaum lub sijhawm digital real-time bandwidth tsim nyog rau kev ntsuas ntawm ob qho tib si rov ua dua thiab ib qho teeb meem. Cov chaw tsim khoom thov tias qhov bandwidth ntawm oscilloscope tuaj yeem ncav cuag ob peb megabytes, tab sis nws yeej yog hais txog qhov analog bandwidth. Cov digital real-time bandwidth qis dua tus nqi no. Piv txwv li, lub bandwidth ntawm TEK's TES520B yog 500MHz, uas txhais tau hais tias nws analog bandwidth yog 500MHz, thaum lub siab tshaj plaws digital real-time bandwidth tsuas yog ncav cuag 400MHz, uas yog deb tshaj qhov analog bandwidth. Yog li ntawd, thaum ntsuas ib lub teeb liab, koj yuav tsum xa mus rau lub digital real-time bandwidth ntawm lub virtual oscilloscope, txwv tsis pub nws yuav ua rau qhov yuam kev tsis xav txog kev ntsuas.
Hais txog tus nqi piv txwv: Tus nqi piv txwv tseem hu ua tus lej digitization, uas yog hais txog tus naj npawb ntawm cov qauv ntawm cov lus piv txwv ntawm ib lub sijhawm, feem ntau qhia hauv MS / s. Tus nqi piv txwv yog qhov tshwj xeeb tseem ceeb ntawm lub oscilloscope virtual. Yog tias qhov ntsuas tus lej tsis txaus, qhov aliasing tuaj yeem tshwm sim tau yooj yim
Yog hais tias lub teeb liab input ntawm oscilloscope yog 100KHz sine teeb liab, tab sis lub teeb liab zaus tshwm sim los ntawm oscilloscope yog 50KHz, qhov no yog vim qhov piv txwv tus nqi ntawm oscilloscope qeeb dhau, ua rau aliasing. Aliasing yog thaum qhov zaus ntawm lub waveform tso tawm ntawm lub vijtsam qis dua qhov tseeb zaus ntawm lub teeb liab, lossis cov duab waveform tsis ruaj khov txawm tias lub teeb ntawm oscilloscope yog teeb. Lub cim ntawm aliasing yog qhia nyob rau hauv daim duab 1. Tom qab ntawd, rau lub waveform ntawm tsis paub zaus, koj tuaj yeem txiav txim seb lub waveform uas pom tau aliased li no: maj mam hloov lub cheb ceev t / div mus rau lub sij hawm sai dua cov ntaub ntawv, thiab saib seb lub zaus parameters ntawm waveform hloov sharply. Yog tias muaj, Nws txhais tau hais tias waveform aliasing tau tshwm sim; los yog lub co co waveform tau stabilized ntawm lub sij hawm sai dua, uas kuj txhais tau hais tias waveform aliasing tau tshwm sim. Raws li Nyquist theorem, tus nqi piv txwv yuav tsum muaj tsawg kawg yog ob zaug siab dua qhov siab-frequency tivthaiv ntawm lub teeb liab los tiv thaiv aliasing. Piv txwv li, lub teeb liab 500MHz yuav tsum muaj qhov piv txwv tsawg kawg yog 1GS / s. Muaj ntau ntau txoj hauv kev los tiv thaiv aliasing tsis tshwm sim:
?Siv kev teeb tsa tsis siv neeg
? Kho scanning ceev;
Sim hloov hom sau mus rau hom hnab ntawv lossis hom kev kuaj pom qhov siab tshaj plaws, vim tias lub hnab ntawv hom yog nrhiav cov txiaj ntsig zoo hauv ntau cov ntaub ntawv sau, thaum lub ncov nrhiav pom hom yog nrhiav qhov siab tshaj plaws thiab qhov tsawg kawg nkaus hauv cov ntaub ntawv sau ib zaug. Ob txoj hauv kev tuaj yeem kuaj pom cov teeb liab hloov sai.
