Iki gice gisobanura inzira yikizamini cya TDR

TDR ni impfunyapfunyo yigihe-indangagaciro Reflectometry.Nubuhanga bwa kure bwo gupima isesengura imiraba igaragara kandi ikamenya imiterere yikintu cyapimwe kumwanya wa kure.Mubyongeyeho, hari igihe indangarubuga yerekana;Gutinda-gutinda;Kohereza Data Kwiyandikisha bikoreshwa cyane cyane mubikorwa byitumanaho mugihe cyambere kugirango hamenyekane aho umuyoboro woguhagarara uhagaze, bityo nanone witwa "umugozi wa detector".Igihe cyerekana indangarugero ni igikoresho cya elegitoronike ikoresha igihe cyerekana indangarubuga kugirango iranga kandi ibone amakosa mu nsinga z'icyuma (urugero, imigozi ihindagurika cyangwa insinga za coaxial).Irashobora kandi gukoreshwa mugushakisha aho uhagarara muguhuza, imbaho ​​zumuzingo zacapwe, cyangwa izindi nzira zose zamashanyarazi.

Imigaragarire ya E5071c-tdr irashobora gukora ikarita yijisho ryikigereranyo idakoresheje generator yinyongera;Niba ukeneye ikarita yigihe cyamaso, ongeramo generator yerekana ibimenyetso kugirango bipime byuzuye!E5071C ifite iyi mikorere

Incamake yuburyo bwo kohereza ibimenyetso

Mu myaka yashize, hamwe niterambere ryihuse ryibipimo byibipimo byitumanaho rya digitale, kurugero, umuguzi woroheje USB 3.1 bit ndetse yageze kuri 10Gbps;USB4 ibona 40Gbps;Gutezimbere igipimo cya biti bituma ibibazo bitigeze bigaragara muri sisitemu gakondo ya digitale itangira kugaragara.Ibibazo nko gutekereza no gutakaza birashobora gutera kugoreka ibimenyetso bya digitale, bikavamo amakosa ya bit;Mubyongeyeho, kubera igabanuka ryigihe cyemewe kugirango tumenye neza imikorere yigikoresho, gutandukana kwigihe munzira yikimenyetso biba ngombwa cyane.Imirasire yumuriro wa electromagnetic hamwe no guhuza byakozwe na capacitance yazimiye bizaganisha kumihanda kandi bituma igikoresho gikora nabi.Mugihe imirongo igenda iba nto kandi igakomera, ibi biba byinshi mubibazo;Kugirango ibintu birusheho kuba bibi, kugabanuka kwa voltage yo gutanga bizavamo igipimo cyo hasi cyerekana-urusaku, bigatuma igikoresho cyoroha cyane urusaku;

Guhuza vertical ya TDR ni impedance

TDR igaburira intambwe kuva ku cyambu kugera kumuzunguruko, ariko kuki igice gihagaritse cya TDR atari voltage ahubwo ni impedance?Niba ari impedance, kuki ushobora kubona inkombe izamuka?Ni ibihe bipimo bikozwe na TDR ishingiye kuri Vector Network Analyser (VNA)?

VNA ni igikoresho cyo gupima inshuro zisubizwa igice cyapimwe (DUT).Iyo upimye, ikimenyetso cyo kwishima cya sinusoidal ni icyinjijwe mubikoresho byapimwe, hanyuma ibisubizo byo gupima biboneka mukubara igipimo cya amplitude igereranya hagati yikimenyetso cyinjira nikimenyetso cyohereza (S21) cyangwa ikimenyetso kigaragara (S11).Ibiranga ibisubizo byinshyi birashobora kuboneka mugusikana ibimenyetso byinjira murwego rwapimwe.Gukoresha bande ya filteri mugupima imashini yakira irashobora gukuraho urusaku nibimenyetso bidakenewe mugupima ibisubizo no kunoza gupima neza

Igishushanyo mbonera cyibimenyetso byinjiza, ibimenyetso byerekana ibimenyetso

Nyuma yo kugenzura amakuru, byagaragaye ko igikoresho cya TDR gisanzwe cya voltage amplitude yumuraba wagaragajwe, hanyuma bingana na impedance.Coefficient yo kwerekana ρ ingana na voltage igaragara igabanijwe na voltage yinjira;Kuzirikana bibaho aho impedance idahagarara, na voltage yagaragajwe inyuma iringaniza itandukaniro riri hagati yinzitizi, kandi voltage yinjiza ihwanye numubare wimbogamizi.Dufite formula ikurikira.Kubera ko icyambu gisohoka cyibikoresho bya TDR ari 50 oms, Z0 = 50 oms, Z rero irashobora kubarwa, ni ukuvuga, impedance curve ya TDR yabonetse kubutaka.

Kubwibyo, kuri iyi shusho yavuzwe haruguru, impedance igaragara mugice cyambere cyibimenyetso byerekana ibimenyetso ni bito cyane kurenza 50 oms, kandi ahahanamye harahagaze kumurongo uzamuka, byerekana ko inzitizi yagaragaye ihwanye nintera yagenze mugihe cyo gukwirakwiza imbere; cy'ikimenyetso.Muri iki gihe, impedance ntabwo ihinduka.Ndibwira ko ahubwo ari ukuzenguruka kuvuga ko bifatwa nkaho inkombe izamuka yakuweho nyuma yo kugabanuka kwa impedance, amaherezo ikadindira.Mu nzira yakurikiyeho ya impedance nkeya, yatangiye kwerekana ibiranga inkombe izamuka kandi ikomeza kuzamuka.Hanyuma impedance irenga 50 oms, bityo ibimenyetso birenga gato, hanyuma bigaruka buhoro buhoro, hanyuma amaherezo bigahagarara kuri 50 oms, kandi ikimenyetso kigeze ku cyambu gitandukanye.Muri rusange, akarere kagabanutseho impedance irashobora gutekerezwa nkaho ifite umutwaro wa capacitif hasi.Agace aho impedance yiyongera gitunguranye birashobora gutekerezwa nkaho ifite inductor ikurikiranye.