Iki gice gisobanura inzira yo gupima TDR

TDR ni ijambo rihinnye risobanura "time-domain Reflectometry". Ni ikoranabuhanga ryo gupima kure risesengura imiraba igaragara kandi rigamenya imiterere y'ikintu gipimwe aho gipimwe kiri mu mwanya wo kugenzura kure. Byongeye kandi, hari "time domain reflectometry"; "Time-delay relay"; "Transmit Data Register" ikoreshwa cyane cyane mu nganda z'itumanaho mu ntangiriro kugira ngo imenye aho insinga z'itumanaho ziherereye, bityo yitwa "cable detector". "Time domain reflectometer" ni igikoresho cy'ikoranabuhanga gikoresha "time domain reflectometer" kugira ngo kimenye kandi kimenye amakosa ari mu nsinga z'icyuma (urugero, insinga zigoretse cyangwa "coaxial"). Ishobora kandi gukoreshwa mu kumenya aho ibintu bitandukaniye mu miyoboro, mu mbaho ​​zacapwe, cyangwa mu yindi nzira y'amashanyarazi.

E5071c-tdr ishobora gukora ikarita y'amaso yigana idakoresheje indi mashini ikora kode; Niba ukeneye ikarita y'amaso ikora mu gihe nyacyo, ongeramo mashini ikora ikimenyetso kugira ngo ipime neza! E5071C ifite iyi nshingano.

Incamake y'inyigisho yo kohereza ibimenyetso

Mu myaka ya vuba aha, bitewe n’izamuka ryihuse ry’umuvuduko wa biti mu buryo bw’ikoranabuhanga, urugero, umuvuduko woroshye wa biti ya USB 3.1 ukoreshwa wageze kuri 10Gbps; USB4 ibona 40Gbps; Iterambere ry’umuvuduko wa biti rituma ibibazo bitari byarigeze bigaragara muri sisitemu ya digitale isanzwe bitangira kugaragara. Ibibazo nko kugarura no gutakaza bishobora gutera kugoreka kw’ibimenyetso bya digitale, bigatera amakosa ya biti; Byongeye kandi, bitewe no kugabanuka kw’igihe cyemewe kugira ngo igikoresho gikore neza, kunyuranya kw’igihe mu nzira y’ibimenyetso biba ingenzi cyane. Imirasire ya electromagnetic wave n’imikoranire biva mu bushobozi bwo gusimbuka bizatuma igikoresho kigenda nabi. Uko imiyoboro igenda iba mito, ibi biba ikibazo gikomeye; Ikirushaho kuba kibi, kugabanuka k’umuvuduko w’amashanyarazi bizatuma ikigereranyo cy’ibimenyetso kigabanuka, bigatuma igikoresho kibasha kwibasirwa n’urusaku;

Igipimo cy'inyuma cya TDR ni impedance

TDR itanga umuraba w’intambwe uva ku cyambu ujya ku muyoboro, ariko kuki igice gihagaze cya TDR atari voltage ahubwo ari impedance? Niba ari impedance, kuki ubona impande zizamuka? Ni ibihe bipimo bikorwa na TDR hashingiwe kuri Vector Network Analyzer (VNA)?

VNA ni igikoresho gipima ubwinshi bw'igipimo cy'igice cyapimwe (DUT). Mu gupima, ikimenyetso cyo gushyushya cya sinusoidal cyinjizwa mu gikoresho cyapimwe, hanyuma ibisubizo byo gupima bikaboneka hakoreshejwe kubara ikigereranyo cy'ubwinshi bw'amajwi hagati y'ikimenyetso cyinjiye n'ikimenyetso cyo kohereza (S21) cyangwa ikimenyetso cyagaragaye (S11). Ibiranga ubwinshi bw'igikoresho bishobora kuboneka hakoreshejwe gushakisha ikimenyetso cyinjiye mu rugero rwa frequency rwapimwe. Gukoresha akayunguruzo k'inyuguti mu kwakira ibipimo bishobora gukuraho urusaku n'ikimenyetso kidakenewe mu bipimo no kunoza uburyo ibipimo bipimwa.

Imbonerahamwe y'ikimenyetso cy'ikimenyetso cyinjiye, ikimenyetso cyagaragajwe n'ikimenyetso cyo kohereza

Nyuma yo kugenzura amakuru, IT yasanze igikoresho cya TDR cyarahinduye imiterere ya voltage y'umuraba wagaragaye, hanyuma kikayigereranya na impedance. Coefficient ya reflection ρ ingana na voltage yagaragaye igabanijwe na voltage yinjiye; Reflection iba aho impedance idakomeza, kandi voltage yagaragaye inyuma ingana n'itandukaniro riri hagati ya impedance, kandi voltage yinjiye ingana n'igiteranyo cya impedance. Rero dufite formula ikurikira. Kubera ko port ya output ya TDR instrument ari 50 ohms, Z0=50 ohms, bityo Z ishobora kubarwa, ni ukuvuga impedance curve ya TDR yabonetse hifashishijwe igishushanyo.

Kubwibyo, muri iyi shusho iri hejuru, impedance igaragara mu cyiciro cya mbere cy'ikimenyetso ni nto cyane kurusha 50 ohms, kandi umusozi uhagaze neza ku nkengero zizamuka, bigaragaza ko impedance igaragara ijyanye n'intera yagenze mu gihe cyo gukwirakwiza ikimenyetso imbere. Muri iki gihe, impedance ntihinduka. Ndatekereza ko ari roundabout kuvuga ko bifatwa nk'aho impedance izamuka yazamuwe nyuma yo kugabanuka kwa impedance, amaherezo ikagabanuka. Mu nzira yakurikiyeho ya impedance nto, yatangiye kugaragaza imiterere y'inkombe izamuka kandi ikomeza kuzamuka. Hanyuma impedance irenga 50 ohms, bityo ikimenyetso kirarenga gato, hanyuma kikagaruka buhoro buhoro, amaherezo kigahagarara kuri 50 ohms, kandi ikimenyetso cyageze ku cyambu gitandukanye. Muri rusange, agace aho impedance imanuka gashobora gufatwa nk'aho gafite umutwaro ucapacitive ku butaka. Agace aho impedance yiyongera mu buryo butunguranye gashobora gufatwa nk'aho gafite inductor mu buryo bukurikiranye.