Kuyini impedance sici

Omunye nemingcele yiliphi umugqa conductive isici impedance. Lokufaneleka esithileko Uthola ephezulu imvamisa ukudluliswa umsakazo amasu, lapho kancane ukusebenza lokungafani wesifunda kuholela Ukuhlanekezelwa okuphawulekayo okukhiphayo. Ngakolunye uhlangothi, umnikazi computer ezihambisana nezinye e inethiwekhi wendawo ngamunye, ubhekene eside nsuku zonke "isici impedance." Kufanele kuqashelwe ukuthi ukubukeka-Ethernet amanethiwekhi pair ezisontekile akunika umsebenzisi ukuphela kuyobe kungakazukufika ukhathazeke nezixhumi ekhethekile, earthing, njengoba nezixhumi futhi terminators, njengoba kwakunjalo ne coaxial ikhebula imigqa 10 megabit (noma ngaphansi). Nokho, ngisho maqondana umbhangqwana nesisontekile, igama elithi "impedance sici" iyasebenza. Ngokuvamile, ekuqhubeni amanethiwekhi computer ikakhulukazi egqanyisiwe kamuva.

Ngakho, liyini isici impedance? Njengoba kakade kushiwo, lokhu ingenye izici imigqa conductive ngesisekelo babashayeli metallic. Ibinzana zokugcina kuyadingeka ukuze uhlanganise yesimanje optical ukuthumela idatha imigqa izintambo zethusi zakudala, okuyizinto abathwali amandla kungukuthi izinhlayiya icala nokukhanya - kukhona eminye imithetho. Lokhu value kubonisa umugqa kokuba ukumelana ukubaluleka generator (umthombo modulated oscillations kagesi). Musa ukudida ukumelana, okungase kukalwa multimeter ezivamile, futhi impedance sici imvelo, njengoba izinto ezahlukene ngokuphelele. Lesi sakamuva akuxhomekile ubude umqhubi (lokhu kakade ngokwanele ukuba bafinyelele iziphetho mayelana "ukufana" ukumelana). Emzimbeni, ke ilingana empandeni square we ratio inductance (Henry) phama (Farad). Amazwi amancane: naphezu kweqiniso lokuthi izibalo wasebenzisa izingxenye esisheshayo komugqa, ukumelana negagasi wesifunda njalo izibalo kubhekwa asebenzayo.

Kungcono njengelungile yonke isibonelo. Cabanga wesifunda elula ehlanganisa umthombo wamandla (ugesi, u-R1), babashayeli kokuba impedance sici (R2), kanti umthengi (umthwalo, R3). Endabeni ka ukulingana kwabo bonke resistances ezintathu wonke amandla ngocansi ifinyelela umthengi futhi yenza umsebenzi ewusizo. Uma kunoma iyiphi ingxenye yaleli kwesibalo akuyona wanelisa, kukhona operation nakancane. Ngesikhathi phuzu lapho sinqamukile emgqeni, kukhona wave kubonakala, futhi ingxenye amandla kagesi liyabuya - ukuba generator. Ngakho, kubalulekile ukwandisa amandla ayo ukuze sivale lapho sisilela ubukhulu amandla kubonakala. Ngamanye amazwi, ingxenye amandla ichithwa "lutho", okusho ukuthi ukulahlekelwa kanye nokusebenza non-elilungile. Ngaphezu kwalokho, kwezinye izimo, nokungahambisani ngokuvamile kuphazamisa ukusebenza lonke umugqa.

Manje emuva inethiwekhi computer, lapho ukumelana wave linendima ebalulekile. Kolayini esekelwe ikhebula coaxial (50 Ohm) Kubalulekile ukuhlonipha izimo: Ukumelana inethiwekhi amakhadi kanye umqhubi phakathi kwabo kufanele alingane. Kuphela kuleli cala, usebenza ekunqanyulweni futhi isisekelo sohlelo. Uma noma iyiphi ingxenye umugqa ikhebula kuyinto ngokomzimba elula kancane (ekubambeleleni umqhubi umthwalo), khona-ke ngenxa yezinguquko ububanzi babashayeli kule ndawo zizoshintsha isici impedance, lapho kuyobonakala igagasi, izinto ziyawohloka ohlelweni. Kulesi simo kulinganiswa esebenzayo yokumelana umugqa kungenzeka ushintshe kakhulu (amadivayisi eziphansi musa ukubhalisa ukwanda ukumelana). Imizamo ukubuyisela babashayeli line nokunamathisela ngomthofu engxenyeni ezilimele okwengeziwe senze isimo sishube, ngoba ngeke nje uthumele ukumelana, inhlanganisela ezahlukene (tin, ithusi) lapho amagagasi asakaze ehlukile.

Njengoba othandwayo i ezisontekile pair isigaba 5 isici impedance kuyinto ohms 100. Ngenxa yalesi yokutakula kungenzeka soldered, ngisho ezimazombe.