Kev tsom xam ntawm qhov cuam tshuam ntawm crosstalk ntawm oscilloscope raws
Tam sim no, yuav luag tag nrho cov oscilloscope channels ntawm cov hom lag luam tsis raug cais tawm. Thaum ua qhov kev sim ntau-channel, cov channel yuav cuam tshuam rau ib leeg rau qee yam. Yog li ntawd, qhov ntsuas qhov sib cais channel tseem ceeb heev. Qhov siab dua qhov kev sib cais, qhov zoo dua qhov kev ntsuas oscilloscope. Qhov ntau yog nws.
Raws li "qhov muag" ntawm cov engineers, oscilloscope tuaj yeem pab nrhiav tau ntau yam teeb meem. Raws li cov cuab yeej los nrhiav cov teeb meem, nws qhov tseeb yog qhov tseem ceeb. Thaum qhov chaw kuaj xyuas tsis cuam tshuam nrog oscilloscope, ntxiv rau cov suab nrov hauv pem teb uas yuav cuam tshuam rau qhov kev xeem, qhov kev sib cais channel tseem yuav cuam tshuam rau cov txiaj ntsig kev xeem. Tej yam cuam tshuam rau kev xeem.
1. Kev cais channel yog dab tsi?
Raws li lub npe qhia, kev sib cais channel yog qib uas cov cim qhia ntawm ob txoj kev cuam tshuam rau ib leeg. Yog tias peb siv ob txoj kev sim rau tib lub sijhawm, cov teeb liab ntawm channel 1 thiab channel 2 puas cuam tshuam rau ib leeg? Puas muaj kev cuam tshuam ntau npaum li cas? Quantifying cov teeb meem no tso cai rau peb nkag siab txog kev cais channel.
2. Yuav ua li cas ntsuas kev cais channel?
Raws li cov lus qhia dav dav rau cov khoom siv digital cia oscilloscopes, thawj zaug teeb tsa qhov kev nkag siab ntsug ntawm oscilloscope txoj kev cuam tshuam cov channel mus rau qib loj, teeb tsa qhov kev nkag siab ntsug ntawm cov kev cuam tshuam cov channel mus rau theem feem ntau cuam tshuam rau kev cuam tshuam, thiab tiv thaiv cov tswv yim kawg.
Peb kho cov iav ntsug ntawm channel 1 (interfering channel) rau 500mV / div, kho cov iav ntsug ntawm channel 2 (interfered channel) mus rau 2mV / div, thiab tawm hauv qhov kawg ntawm channel 2 ntab.
Tom qab ntawd teeb tsa lub teeb liab los tso tawm lub teeb liab sinusoidal thiab pub rau hauv qhov cuam tshuam channel (channel 1). Kho nws cov zis kom cov zaub amplitude nce mus txog ntau tshaj 80% ntawm qhov siab ntawm qhov chaw zoo ntawm lub waveform zaub, thiab cov zaub yog nruab nrab thiab ruaj khov.
3. Yuav ua li cas xam kev cais channel?
Raws li lub ntsiab lus ntawm lub teb chaws tus qauv, kev sib cais channel yog:, qhov twg K sawv cev rau cov channel rhiab heev, A sawv cev rau lub amplitude ntawm cov channel zaub, subscript 1 sawv cev rau kev cuam tshuam channel (uas yog, channel ib qho hauv kab lus no), thiab tus subscript 2 sawv cev rau Cov channel cuam tshuam (uas yog, channel 2 hauv kab lus no) yog =500mV/div, =2 mV/div, =3V, =157uV. Los ntawm kev suav, qhov kev sib cais channel yog 133.58dB.
4. Lub luag haujlwm ntawm kev sib cais channel
Qhov ntau dua tus nqi ntawm kev sib cais channel, qhov me me ntawm crosstalk ntawm cov channel, thiab qhov tseeb dua qhov kev xeem yuav yog! Nws tsis yog qhov nyuaj kom pom los ntawm qhov ntsuas qhov ntsuas tau tshwm sim hauv daim duab 2 tias lub teeb liab sine yoj nrog lub amplitude ntawm 3V txuas nrog ib qho channel. Ntawm 2 mV / div theem ntawm channel ob, lub amplitude tsuas yog 157uV. Lub crosstalk ntawm cov channel yog tsawg heev. Qhov tseeb ntawm qhov kev xeem tau lees paub.
