Gawoli likufotokoza za mayeso a TDR

TDR ndi chidule cha time-domain Reflectometry.Ndiukadaulo woyezera patali womwe umasanthula mafunde owoneka ndikuphunzira momwe zinthu zimapimidwira pamalo akutali.Kuphatikiza apo, pali nthawi domain reflectometry;Relay yochedwa nthawi;Transmit Data Register imagwiritsidwa ntchito kwambiri pamakampani olumikizirana koyambirira kuti azindikire pomwe chingwe cholumikizirana chilili, motero chimatchedwanso "cable detector".A time domain reflectometer ndi chida chamagetsi chomwe chimagwiritsa ntchito refleometer ya nthawi kuti izindikire ndi kupeza zolakwika mu zingwe zachitsulo (mwachitsanzo, zingwe zopotoka kapena coaxial).Itha kugwiritsidwanso ntchito kupeza ma discontinuities mu zolumikizira, ma board osindikizidwa, kapena njira ina iliyonse yamagetsi.

E5071c-tdr mawonekedwe ogwiritsa ntchito amatha kupanga mapu ofananirako osagwiritsa ntchito ma code jenereta;Ngati mukufuna mapu a maso enieni, onjezani jenereta yazizindikiro kuti mumalize kuyeza!E5071C ili ndi ntchitoyi

Chidule cha chiphunzitso chotumizira ma signal

M'zaka zaposachedwa, ndi kuwongolera kofulumira kwa njira zolumikizirana zama digito, mwachitsanzo, ogula osavuta kwambiri a USB 3.1 adafika ku 10Gbps;USB4 imapeza 40Gbps;Kuwongolera kwa bit rate kumapangitsa kuti mavuto omwe sanawonekere mudongosolo lakale la digito ayambe kuwonekera.Mavuto monga kusinkhasinkha ndi kutayika kungayambitse kusokonezeka kwa chizindikiro cha digito, zomwe zimapangitsa kuti pakhale zolakwika pang'ono;Kuonjezera apo, chifukwa cha kuchepa kwa malire a nthawi yovomerezeka kuti atsimikizire kuti chipangizocho chikugwira ntchito moyenera, kupatuka kwa nthawi mu njira ya chizindikiro kumakhala kofunika kwambiri.Ma radiation a electromagnetic wave ndi kulumikizana komwe kumapangidwa ndi stray capacitance kumapangitsa kuti chipangizocho chizigwira ntchito molakwika.Pamene mabwalo akucheperachepera, izi zimakhala zovuta kwambiri;Kuti zinthu ziipireipire, kuchepa kwa magetsi operekera kumapangitsa kuti phokoso likhale lochepa kwambiri, zomwe zimapangitsa kuti chipangizocho chikhale chosavuta kumva phokoso;

Kulumikizana koyima kwa TDR ndiko kulepheretsa

TDR imadyetsa mafunde kuchokera padoko kupita kudera, koma chifukwa chiyani gawo loyimirira la TDR siliri magetsi koma kusokoneza?Ngati ndi impedance, nchifukwa chiyani mukuwona kukwera?Ndi miyeso yotani yomwe TDR imapangidwa ndi Vector Network Analyzer (VNA)?

VNA ndi chida choyezera kuyankha pafupipafupi kwa gawo loyezedwa (DUT).Poyezera, sinusoidal excitation siginecha imalowetsedwera ku chipangizo choyezera, ndiyeno zotsatira zoyezera zimapezedwa powerengera kuchuluka kwa matalikidwe a vector pakati pa chizindikiro cholowera ndi chizindikiro chotumizira (S21) kapena chizindikiro chowonekera (S11).Makhalidwe oyankha pafupipafupi a chipangizocho atha kupezedwa poyang'ana siginecha yolowera mumitundu yamafupipafupi.Kugwiritsa ntchito band pass fyuluta poyezera wolandila kumatha kuchotsa phokoso ndi chizindikiro chosafunikira pazotsatira zoyezera ndikuwongolera kulondola kwa kuyeza.

Chithunzi chojambula cha chizindikiro cholowetsa, chizindikiro chowonetsera ndi chizindikiro chotumizira

Pambuyo poyang'ana zambiri, IT idapezeka kuti chida cha TDR chidasinthiratu kuchuluka kwa mafunde owoneka bwino, kenako ndikufanana ndi impedance.Chowonetserako ρ ndi chofanana ndi voteji yowonetsedwa yomwe imagawidwa ndi magetsi olowera;Kuwunikira kumachitika pomwe kusokoneza sikupitilira, ndipo ma voliyumu omwe amawonetsedwa kumbuyo amafanana ndi kusiyana pakati pa zopinga, ndipo voteji yolowera imayenderana ndi kuchuluka kwa zopinga.Kotero ife tiri ndi ndondomeko yotsatirayi.Popeza doko lotulutsa la chida cha TDR ndi 50 ohms, Z0 = 50 ohms, kotero Z ikhoza kuwerengedwa, ndiye kuti, kupindika kwa TDR komwe kumapezeka ndi chiwembu.

Chifukwa chake, pachithunzi pamwambapa, kutsekeka komwe kumawoneka pachiwonetsero choyambirira cha chizindikirocho ndikocheperako kuposa 50 ohms, ndipo malo otsetsereka ndi okhazikika m'mphepete mwake, zomwe zikuwonetsa kuti kutsekeka komwe kumawoneka kumayenderana ndi mtunda womwe wayenda panthawi yakutsogolo. cha chizindikiro.Panthawi imeneyi, impedance sikusintha.Ndikuganiza kuti ndizozungulira kunena kuti zimawonedwa ngati kuti m'mphepete mwake munayamwa pambuyo pakuchepetsa kwa impedance, ndipo pamapeto pake adatsika.M'njira yotsatizana ndi kuchepa kwapang'onopang'ono, idayamba kuwonetsa mawonekedwe akukwera m'mphepete ndikupitilira kukwera.Ndiyeno kusokoneza kumapitirira 50 ohms, kotero chizindikirocho chimadutsa pang'ono, kenako pang'onopang'ono chimabwereranso, ndipo pamapeto pake chimakhazikika pa 50 ohms, ndipo chizindikirocho chafika pa doko lina.Nthawi zambiri, dera lomwe madontho a impedance amatha kuganiziridwa kuti ali ndi capacitive katundu pansi.Dera lomwe kusokoneza kumawonjezeka mwadzidzidzi kumatha kuganiziridwa ngati kukhala ndi inductor mndandanda.