5 Cov lus nug nquag nug txog Oscilloscopes
1. Lub waveform ntawm oscilloscope sawv cev li cas?
Nyob rau hauv ib tug nutshell: kab rov tav coordinate sawv cev rau lub sij hawm, lub ntsug kev sib koom tes sawv cev rau voltage (feem ntau voltage), thiab lub nkhaus ntawm voltage lub sij hawm yog lub waveform tso tawm los ntawm oscilloscope. Qhov kev sib tshuam ntsug yog nkag siab zoo dua li qhov loj ntawm qhov voltage. Kab rov tav coordinates sawv cev rau lub sij hawm, thiab muaj ntau tus neeg raug mob nyob rau hauv nws, tab sis tsuav yog koj them sai sai rau cov ntsiab lus hauv qab no:
Nco tseg: Lub oscilloscope yog lub sijhawm tiag tiag, thiab qhov oscilloscope qhia, yog dab tsi tshwm sim tam sim no.
Vim li cas thiaj hais txog qhov no? Vim hais tias ib tug neeg nug kuv tias: kuv oscilloscope yuav qeeb npaum li cas, tso saib lub waveform kom tos ntau tshaj kaum vib nas this, raws li cov khoom siv hluav taws xob, tso saib waveform tsis yog qhov thib ob? Kuv saib, tab sis tsis ntau tshaj kaum vib nas this, nws teem qhov ntev ntawm kab rov tav coordinate yog ntau tshaj kaum vib nas this. Nws xav tias 10 vib nas this tsuas yog cov yam ntxwv ntawm lub teeb liab thiab tsis muaj dab tsi ua rau lub sijhawm tiag tiag.
2. Daim phiaj ntawm oscilloscope waveform cheeb tsam sawv cev li cas?
Oscilloscope waveform cheeb tsam kab rov tav kab sawv cev rau lub sij hawm, raws li qhia nyob rau hauv daim duab, kab rov tav kev taw qhia ntawm txhua daim phiaj yog 200us, lub square yoj lub sij hawm ntawm 5 hlwb, uas yog, 1ms, square wave zaus ntawm 1KHz.
Txoj kab ntsug ntsug ntawm oscilloscope waveform cheeb tsam sawv cev rau qhov hluav taws xob, qhov kev taw qhia ntsug tam sim no yog 500mV ib lub xov tooj ntawm tes, square yoj amplitude yog 4 hlwb, piv txwv li 2V.
3. Los ntawm "automatic" tham, yuav ua li cas lub oscilloscope yog teem?
Thaum peb xav kuaj lub teeb liab, qhov yooj yim tshaj plaws los sim yog nyem "Auto" ntawm oscilloscope, lub npe ntawm lub pob no txawv ntawm oscilloscope mus rau oscilloscope, piv txwv li, "AutoSet", "Auto", "Auto", " AutoSet", "AutoSet", "AutoSet", "AutoSet", "AutoSet", "AutoSet", "AutoSet", thiab lwm yam. Auto", "AutoSet" thiab lwm yam.
Nco ntsoov: Nco ntsoov txuas qhov kev sojntsuam mus rau lub teeb liab ua ntej nias lub pob "Auto".
Tom qab nias lub pob "Auto", lub oscilloscope yuav hloov kho nws tus kheej raws li qhov tsis muaj ntawm lub teeb liab, kom lub teeb liab waveform yuav tshwm rau ntawm lub vijtsam nrog qhov tsim nyog amplitude thiab lub sijhawm ruaj khov.
4. Oscilloscope Chaw - Vertical Amplitude, Kab rov tav Sijhawm
Vertical Amplitude:
Lub teeb liab yuav tsum tau muab tso rau ntawm qhov screen nrog qhov tsim nyog amplitude (piv txwv li ntsug magnitude). Yog hais tias qhov ntsug qhov loj me me dhau, lub teeb liab waveform yuav dhau ntawm qhov screen thiab tsis tuaj yeem tso tawm kom pom tag nrho; yog tias qhov ntsug qhov loj heev, tsis tsuas yog koj tuaj yeem tsis pom cov ntsiab lus ntawm lub teeb liab kom meej, nws kuj zoo li tsis xis nyob;
Kab rov tav Sijhawm:
Lub teeb liab yuav tsum tau muab tso tawm rau ntawm lub vijtsam hauv lub sijhawm tsim nyog (piv txwv li lub sijhawm ntev nyob rau hauv txoj kab rov tav). Yog hais tias lub sij hawm lub hauv paus me me dhau, lub teeb liab waveform yog stretched deb dhau, thiab tag nrho lub voj voog tsis tuaj yeem pom. Yog tias lub sij hawm lub hauv paus loj dhau, lub teeb liab waveform yog compressed ua ke thiab tsis tuaj yeem pom hauv kev nthuav dav.
5. Oscilloscopes peb lub cim tseem ceeb - bandwidth
Bandwidth yog qhov taw qhia yooj yim ntawm oscilloscope, thiab bandwidth ntawm lub amplifier yog tib yam li qhov hu ua -3dB point, uas yog:
Ntawm cov tswv yim ntawm oscilloscope nrog sine yoj, qhov amplitude attenuation rau qhov tseeb amplitude ntawm 70.7% ntawm qhov zaus taw tes yog hu ua bandwidth.
Qhov ntawd yog hais tias, nrog 100MHz bandwidth oscilloscope los ntsuas qhov amplitude ntawm 1V zaus ntawm 100MHz sine yoj, qhov tseeb amplitude yuav tsis tsawg dua 0.707V.
To taub lub ntsiab lus no, peb kuj tuaj yeem tau txais kev sib raug zoo ntawm lub sijhawm nce thiab bandwidth, uas yog: nce lub sijhawm=0.35 / bandwidth.
