Izixhobo zemveli zokulungisa ingxaki PCB zibandakanya: i-oscilloscope ye-domain yexesha, i-TDR (i-domain ye-reflectometry) i-oscilloscope, i-logic analyzer, kunye ne-frequency domain analyzer kunye nezinye izixhobo, kodwa ezi ndlela azikwazi ukubonakalisa ulwazi olubanzi lweenkcukacha zebhodi ye-PCB. Eli phepha lazisa indlela yokufumana ulwazi olupheleleyo lwe-electromagnetic ye-PCB ngenkqubo ye-EMSCAN, kwaye ichaza indlela yokusebenzisa olu lwazi ukunceda ukuyila nokulungisa ingxaki.

I-EMSCAN ibonelela ngemisebenzi ebonakalayo kunye nokuskena indawo. Iziphumo zokuskena kwembonakalo zinokusinika umbono opheleleyo wesilinganiselo esiveliswe yi-EUT: zingaphi izinto ezihamba rhoqo, kwaye yintoni ubukhulu bokuqikelelwa kwecandelo ngalinye le frequency. Iziphumo zokuskena kwendawo yimephu yesimo sendawo enemibala emele ukuphakama kwenqaku lamaxesha. Sibona ukusasazeka kwentsimi ye-elektronignetic yokuhanjiswa kwenqaku lendawo ethile yamaza eveliswe yi-PCB ngexesha lokwenyani.

“Umthombo wokuphazamiseka” unokufumaneka ngokusebenzisa i-analyzer ye-spectrum kunye neprosesa enye yentsimi esondeleyo. Apha sebenzisa indlela “yomlilo” ukwenza isikweko, unokuthelekisa uvavanyo lwentsimi ekude (uvavanyo oluqhelekileyo lwe-EMC) “ukubona umlilo”, ukuba kukho indawo yokuhamba rhoqo engaphaya komda, ithathwa njenge “ifumene umlilo ”. Isikimu sendabuko “Isicazululi seSectrum + iprobe enye” ​​isetyenziswa ngokubanzi ziinjineli ze-EMI ukukhangela ukuba yeyiphi na indawo kwisisu semoto ebaleka kuyo. Xa kufunyanwa ilangatye, uxinzelelo lwe-EMI lwenziwa ngokubanzi ngokukhusela nokucoca ilangatye ngaphakathi kwemveliso. I-EMSCAN iyasivumela ukuba siqwalasele oyena nobangela wokuphazamiseka, “ukuvutha,” kunye “nomlilo,” ongumgaqo wokusasaza wongenelelo. Xa i-EMSCAN isetyenziselwa ukukhangela ingxaki ye-EMI kuyo yonke le nkqubo, inkqubo yokulandelela ukusuka kwilangatye ukuya kwilangatye iyamkelwa ngokubanzi. Umzekelo, qala uskene isisu semoto okanye ikhebula ukujonga ukuba uphazamiseko luvela phi, emva koko ulandele ngaphakathi kwimveliso, ethi yona i-PCB ibangele ukuphazamiseka, emva koko ulandele isixhobo okanye iintambo.

Indlela ngokubanzi imi ngolu hlobo lulandelayo:

(1) Khangela ngokukhawuleza imithombo yokuphazamiseka kombane. Jonga ulwahlulo lwendawo yeliza elisisiseko kwaye ufumane indawo ebonakalayo kunye nesona sithuba sikhulu kulwabiwo lwendawo yeliza elisisiseko. Ungenelelo lwebhendi ebanzi, khankanya amaza embindini wophazamiso lwebhendi ebanzi (enje nge-60MhZ-80mhz ukuphazamiseka kwebhendi ebanzi, singachaza i-70MHz), jonga ukusasazwa kwendawo yeli nqanaba, fumana indawo ebonakalayo kunye nesona sithuba sikhulu.

(2) Chaza indawo kwaye ubone imephu yendawo ekuyo. Jonga ukuba ukuphakama kwendawo nganye yeharmony kuyangqinelana nomthamo opheleleyo. Ukuba ngaphezulu, kuthetha ukuba indawo echaziweyo yeyona ndawo inamandla ukuvelisa ezi ziphazamiso. Ukuphazamiseka kwebhendi ebanzi, jonga ukuba esi sikhundla sisesona siphezulu salo lonke uphazamiseko lwebroadband.

(3) Kwiimeko ezininzi, ayizizo zonke ii-harmoniki ezenziwe kwindawo enye, ngamanye amaxesha ii-harmonics kunye ne-odoniki engaqhelekanga zenziwa kwiindawo ezahlukeneyo, okanye icandelo ngalinye le-harmonic linokuveliswa kwiindawo ezahlukeneyo. Kule meko, unokufumana i-radiation eyomeleleyo ngokujonga ulwabiwo lwendawo yamanqaku e-frequency owakhathaleleyo.

(4) Ngokuqinisekileyo sesona sisebenzayo ukusombulula iingxaki ze-EMI / EMC ngokuthatha amanyathelo endaweni ngemitha eyomeleleyo.

Le ndlela yokufumanisa i-EMI, enokuthi ilandelele ngokwenyani “umthombo” kunye nendlela yokusasaza, yenza ukuba iinjineli zisombulule iingxaki ze-EMI ngexabiso eliphantsi kwaye ngokukhawuleza. Kwimeko yesixhobo sonxibelelwano, apho imitha ibenyezela ngentambo yomnxeba, kuye kwacaca ukuba ukongeza ukukhusela okanye ukucoca ikhebula akunakwenzeka, kushiya iinjineli zingenakuzenzela nto. Emva kokuba i-EMSCAN isetyenziselwe ukwenza oku kulandelwa kungasentla kunye nokuskena, i-yuan ezimbalwa zichithwe kwibhodi yeprosesa kwaye kufakelwe izixhobo zokucoca ulwelo ezininzi, ezasombulula ingxaki ye-EMI iinjineli ezingakwaziyo ukuyisombulula ngaphambili. Indawo ekhawulezileyo yokufumana indawo yesiphaluka Umzobo 5: Umzobo weSpectrum webhodi eqhelekileyo kunye nebhodi enesiphene.

Njengobunzima bokunyuka kwe-PCB, ubunzima kunye nomthwalo womsebenzi wokulungisa amaphutha nawo uyanda. Nge-oscilloscope okanye i-logic analyser, inye kuphela okanye inani eliqingqiweyo lemigca yesiginali inokubonwa ngexesha, ngelixa kule mihla kungangamawaka emigca yesiginali kwi-PCB, kwaye iinjineli kufuneka zixhomekeke kumava okanye ngethamsanqa ukufumana ingxaki. Ukuba “sinolwazi olupheleleyo lwe-electromagnetic” yebhodi eqhelekileyo kunye nebhodi enesiphako, singafumana isilinganiselo esingaqhelekanga ngokuthelekisa ezi datha zimbini, size sisebenzise “umthombo wokuphazamisa ukufumana itekhnoloji” ukufumana indawo yokuhamba rhoqo spectrum, kwaye emva koko sinokufumana ngokukhawuleza indawo kunye nesizathu sephutha. Emva koko, indawo apho “ukubonwa okungaqhelekanga” kwafunyanwa kwimephu yokuhanjiswa komhlaba kwipleyiti yesiphene, njengoko kubonisiwe kumfanekiso we-6. Ngale ndlela, indawo enesiphene ibekwe kwigridi (7.6mm × 7.6mm), kwaye ingxaki inokuchongwa ngokukhawuleza. Umzobo 6: Fumana indawo ekuyo “indawo engaqhelekanga” kwimephu yokuhanjiswa komhlaba kwipleyiti enesiphoso.

Esi sishwankathelo senqaku

I-PCB yolwazi olupheleleyo lwe-electromagnetic, inokusivumela ukuba sibe nokuqonda okunomdla kuyo yonke i-PCB, kungekuphela nje ekuncedeni iinjineli ukusombulula iingxaki ze-EMI / EMC, kodwa zincedise iinjineli ukulungisa i-PCB, kwaye ziphucule umgangatho wobunjani be-PCB. I-EMSCAN ikwanazo nezicelo ezininzi, ezinje ngokunceda iinjineli zisombulule iingxaki zesimo se-electromagnetic.