ʻO nā pono hana debugging kuʻuna o PCB hui pū me: oscilloscope domain time, TDR (domain domainometometryry) oscilloscope, loiloi mea loiloi, a me nā anamanaʻāina pinepine pinepine a me nā pono hana ʻē aʻe, akā ʻaʻole hiki i kēia mau ala ke hāʻawi i kahi aniani o ka ʻike holoʻokoʻa o ka ʻikepili papa PCB. Hōʻike kēia pepa i ke ʻano o ka loaʻa ʻana o ka ʻike electromagnetic piha o PCB me ka ʻōnaehana EMSCAN, a wehewehe pehea e hoʻohana ai i kēia ʻike e kōkua ai i ka hoʻolālā a me ka hoʻopau ʻana.

Hāʻawi ʻo EMSCAN i nā hana spectrum a me ka nānā ʻana i ka lewa. Hiki i nā hopena o ka scan spectrum ke hāʻawi iā mākou i ka manaʻo maʻamau o ka spectrum i hana ʻia e EUT: ehia mau ʻāpana o ka pinepine, a he aha ka amplitude kokoke o kēlā me kēia ʻāpana alapine. ʻO ka hopena o ka nānā ʻana i ka spatial kahi palapala ʻāina topographic me ke kala e hōʻike ana i ka amplitude no kahi kiko pinepine. Hiki iā mākou ke ʻike i ka mahele hoʻoili uila electromagnetic o kahi kiko pinepine i hoʻokumu ʻia e PCB i ka manawa maoli.

Hiki ke hoʻonohonoho ʻia ke “kumu hoʻoweliweli” ma o ka hoʻohana ʻana i ka spectrum analyzer a me kahi probe kokoke i ka māla. Ma aneʻi e hoʻohana i ke ʻano o ke “ahi” e hoʻokō i kahi ʻano hoʻohālikelike, hiki ke hoʻohālikelike i ka hoʻokolohua kahua mamao loa (EMC hōʻike maʻamau) e “ʻike i kahi ahi”, inā aia kahi kiko pinepine ma waho o ka palena, e manaʻo ʻia ia “loaʻa i ke ahi ”. ʻO ka hana kuʻuna “Spectrum analyzer + single probe” e hoʻohana pinepine ʻia e nā ʻenekini EMI e ʻike i kahi o nā chassis kahi ahi e pakele ai. Ke ʻike ʻia kahi lapalapa ahi, lawe pinepine ʻia ka hoʻopiʻi EMI e ka pale ʻana a me ka kānana ʻana e uhi i ka lapalapa i loko o ka huahana. Hāʻawi ʻo EMSCAN iā mākou e ʻike i ke kumu o kahi interrupt, ka “kindling,” a me ke “ahi,” ʻo ia ke ala hoʻolaha o ka hihia. Ke hoʻohana ʻia ʻo EMSCAN e nānā i ka pilikia EMI o ka ʻōnaehana holoʻokoʻa, hoʻohana pinepine ʻia ke kaʻina huli ʻana mai ka lapalapa i ke ahi. ʻO kahi laʻana, e nānā mua i ka chassis a i ʻole ke kaula uila e nānā i kahi e hele mai ai ka hihia, a laila e alualu i ka loko o ka huahana, kahi a PCB e hoʻowalewale nei, a laila huli i ka hāmeʻa a i ʻole nā ​​uea.

ʻO ke ʻano hana maʻamau penei:

(1) E huli koke i nā kumuwaiwai aina electromagnetic. E nānā i ka hoʻokaʻawale mokulele o ka nalu kumu a loaʻa i ka wahi o ke kino me ka amplitude nui loa ma ka hoʻokaʻawale mokulele o ka nalu kumu. No ke ākea broadband, e kuhikuhi i ke alapine ma waenakonu o ka broadband interferensi (e like me 60MhZ-80mhz broadband interferensi, hiki iā mākou ke kikoʻī i ka 70MHz), e nānā i ka hoʻokaʻawale ākea o kēia wahi pinepine, e huli i ka wahi o ke kino me ka nui o ka amplitude.

(2) E kuhikuhi kikoʻī i ke kūlana a ʻike i ka palapala pae o ke kūlana. E hōʻoia i ka amplitude o kēlā me kēia kiko harmonic ma kēlā wahi i kūlike me ka nui o nā pae. Inā hoʻopili ʻia, ʻo ia hoʻi, ʻo ka wahi i hōʻike ʻia ʻo ia ka wahi ikaika loa e hana i kēia mau haunaele. No ka hoʻoweliweli broadband, e nānā inā ʻo kēia kūlana ke kūlana kiʻekiʻe loa o ka ākea ākea āpau.

(3) I nā manawa he nui, ʻaʻole hana ʻia nā harmonika ma ka wahi like, i kekahi manawa hana ʻia nā harmonics a me nā harmonics ʻano ʻē ma nā wahi like ʻole, a i ʻole e hoʻokumu ʻia kēlā me kēia ʻanikoni ma nā wahi like ʻole. I kēia hihia, hiki iā ʻoe ke ʻike i ka radiation ikaika loa ma ka nānā ʻana i ka mahele mokuna o nā pae alapine āu e mālama ai.

(4) He kanalua ʻole ka hopena maikaʻi loa e hoʻoponopono ai i nā pilikia EMI / EMC ma o ka lawe ʻana i nā ana ma kahi me ka radiation ikaika loa.

ʻO kēia hana ʻike EMI, hiki ke huki maoli i ke ala “kumu” a me ka hoʻolaha ʻana, hiki i nā ʻenekini ke hoʻopilikia i nā pilikia EMI ma ke kumu kūʻai haʻahaʻa a wikiwiki hoʻi. I ke ʻano o kahi pono hana kamaʻilio, kahi e pā mai ai ka pāhawewe mai ke kaula kelepona, ua ʻike ʻia ʻaʻole hiki ke hoʻohui ʻia ka pale ʻana a i ʻole ke kānana ʻana i ke kaula uila, me ka haʻalele ʻole o nā ʻenekini. Ma hope o ka hoʻohana ʻia o EMSCAN e hoʻokō i ka huli ʻana ma luna a me ka ʻimi ʻana, ua hoʻolilo ʻia kekahi mau yuan hou aʻe ma ka papa hana a ua hoʻonohonoho ʻia kekahi mau capacitor kānana hou aʻe, i hoʻonā i ka pilikia EMI i hiki ʻole i nā ʻenekini ke hoʻoholo ma mua. Kahi e huli nei i kahi wahi hewa o ke kaapuni kiʻi 5: Kiʻi uila o ka papa maʻamau a me ka papa hala.

Ke piʻi nei ka paʻakikī o PCB, hoʻonui ka paʻakikī a me ka hana o ka debugging. Me ka oscilloscope a i ʻole ka loiloi mea loiloi, hoʻokahi a i ʻole palena palena o nā laina hōʻailona hiki ke ʻike ʻia i ka manawa, ʻoiai i kēia mau lā aia paha he mau kaukani laina laina ma kahi PCB, a hilinaʻi nā ʻenekini i ka ʻike a i ʻole ka laki e loaʻa ka pilikia. Inā loaʻa iā mākou ka “ʻike electromagnetic piha” o ka papa maʻamau a me ka papa hewa, hiki iā mākou ke loaʻa i ka spectrum frequency maʻamau ma o ka hoʻohālikelike ʻana i nā ʻikepili ʻelua, a laila e hoʻohana i ka ʻenehana ʻimi ʻike kumu “e ʻike ai i kahi o ka pinepine pinepine ʻole. spectrum, a laila hiki iā mākou ke loaʻa koke i kahi a me ke kumu o ka hewa. A laila, ua loaʻa ka wahi o ka “spectrum abnormal” ma ka palapala ʻāina hoʻokaʻawale mokulele o ka pā hewa, e like me ka hōʻike ʻia ma FIG.6. I kēia ala, aia ka wahi hewa i kahi pūnaewele (7.6mm × 7.6mm), a hiki ke ʻike koke ʻia ka pilikia. Kiʻi 6: E ʻike i ka wahi o ka “spectrum spectrum” ma ka palapala ʻāina hoʻoili mokulele o ka pā hewa.

Hōʻuluʻulu manaʻo o kēia ʻatikala

PCB piha ka ʻike electromagnetic, hiki iā mākou ke hoʻomaopopo pono i ka PCB holoʻokoʻa, ʻaʻole wale e kōkua i nā ʻenekini e hoʻonā i nā pilikia EMI / EMC, akā kōkua pū nō hoʻi i nā ʻenekini e debug PCB, a hoʻomaikaʻi mau i ka maikaʻi hoʻolālā o PCB. He nui nā noi a EMSCAN, e like me ke kōkua ʻana i nā ʻenekini e hoʻoponopono i nā pilikia ʻike electromagnetic.