PCB ukwakheka kwesakhiwo kufanele kulandele izimiso ezilandelayo:

a) Hlela ngokunengqondo isikhundla sezingxenye futhi ukwandise ukuminyana kwezingxenye ngangokunokwenzeka ukuze unciphise ubude bocingo, ulawule i-crosstalk futhi unciphise usayizi webhodi eliphrintiwe;

b) Imishini enengqondo enezimpawu ezingenayo neziphumayo ebhodini eliphrintiwe kufanele zibekwe eduze nesixhumi ngangokunokwenzeka futhi zihlelwe ngokulandelana kobudlelwane bokuxhumana kwesekethe ngangokunokwenzeka;

c) Isakhiwo sezoni. Ngokwezinga le-logic, isikhathi sokuguqulwa kwesignali, ukubekezelelana komsindo kanye nokuxhumana okunengqondo kwezingxenye ezisetshenzisiwe, izinyathelo ezifana nokuhlukanisa okuhlobene noma ukuhlukaniswa okuqinile kwama-loops kwamukelwa ukulawula umsindo we-crosstalk wokunikezwa kwamandla, umhlabathi nesiginali;

d) Hambisa ngokulinganayo. Ukuhlelwa kwezingxenye endaweni yonke yebhodi kufanele kube okuhlanzekile nokuhlelekile. Ukusatshalaliswa kwezingxenye zokushisa kanye nobuningi bezintambo kufanele kube okufanayo;

e) Hlangana nezidingo zokukhipha ukushisa. Ukuze upholise umoya noma ungeze amasinki okushisa, ipayipi lomoya noma indawo eyanele yokukhipha ukushisa kufanele igcinwe; ngokupholisa uketshezi, izidingo ezihambisanayo kufanele zihlangatshezwe;

f) Izingxenye ezishisayo akufanele zibekwe eduze kwezingxenye zamandla aphezulu, futhi ibanga elanele kufanele ligcinwe kwezinye izingxenye;

g) Uma izingxenye ezisindayo zidinga ukufakwa, kufanele zihlelwe eduze nendawo yokusekela yebhodi eliphrintiwe ngangokunokwenzeka;

h) Kufanele ihlangabezane nezidingo zokufakwa kwengxenye, ukulungiswa nokuhlolwa;

i) Izinto eziningi ezifana nezindleko zokuklama nezokukhiqiza kufanele zicatshangelwe ngokugcwele.

Imithetho yezintambo ze-PCB

1. Indawo yezintambo

Izinto ezilandelayo kufanele zicatshangelwe lapho kunqunywa indawo yezintambo:

a) Inani lezinhlobo zezingxenye okufanele zifakwe kanye namashaneli ezintambo adingekayo ukuze kuxhunywe lezi zingxenye;

b) Ibanga phakathi kwephethini ye-conductive (okuhlanganisa ungqimba lwamandla kanye nongqimba oluphansi) lwendawo yezintambo zekhondatha ephrintiwe engathinti indawo yezintambo eziphrintiwe phakathi nokucubungula uhlaka kufanele ngokuvamile ingabi ngaphansi kuka-1.25mm ukusuka kuhlaka lwebhodi eliphrintiwe;

c) Ibanga phakathi kwephethini yokuqhuba yongqimba olungaphezulu kanye nomsele womhlahlandlela akufanele kube ngaphansi kuka-2.54mm. Uma i-groove yesitimela isetshenziselwa ukubeka phansi, intambo yaphansi izosetshenziswa njengohlaka.

2. Imithetho yezintambo

Izintambo zebhodi eziphrintiwe kufanele zilandele imithetho elandelayo:

a) Inani lezendlalelo zezintambo zekhondatha eziphrintiwe linqunywa ngokwezidingo. Isilinganiso sesiteshi esisetshenziswa izintambo ngokuvamile kufanele sibe ngaphezu kuka-50%;

b) Ngokwezimo zenqubo kanye nokuminyana kwezintambo, khetha ngokunengqondo ububanzi bezintambo kanye nesikhala sezintambo, futhi ulwele ukufaka izintambo ezifanayo ngaphakathi kongqimba, futhi ukuminyana kwezintambo kongqimba ngalunye kuyafana, uma kunesidingo, amaphedi okuxhuma angewona asebenzayo noma izintambo eziphrintiwe kufanele. kwengezwe ekuntulekeni kwezindawo zezintambo;

c) Izingqimba ezimbili ezincikene zezintambo kufanele zendlalwe zibheke komunye nomunye futhi zigotshwe nge-diagonally noma zigotshwe ukuze kuncishiswe amandla e-parasitic;

d) Izintambo zamakhondakta aphrintiwe kufanele zibe mfishane ngangokunokwenzeka, ikakhulukazi kumasignali amaza aphezulu kanye nemigqa yamasignali ezwela kakhulu; emigqeni yesignali ebalulekile njengamawashi, izintambo zokulibaziseka kufanele zicatshangelwe lapho kudingekile;

e) Lapho imithombo yamandla eminingi (izendlalelo) noma umhlabathi (izendlalelo) ihlelwa phezu kongqimba olufanayo, ibanga lokuhlukanisa akufanele libe ngaphansi kuka-1mm;

f) Emaphethini e-conductive endawo amakhulu amakhulu kuno-5×5mm2, amafasitela kufanele avulwe kancane;

g) Idizayini yokuhlukanisa okushisayo kufanele yenziwe phakathi kwemidwebo yendawo enkulu yesendlalelo sokuhlinzeka amandla kanye nongqimba lomhlabathi kanye namapayipi awo okuxhuma, njengoba kuboniswe kuMfanekiso 10, ukuze kungathinti ikhwalithi yokushisela;

h) Izidingo ezikhethekile zamanye amasekethe kufanele zihambisane nemithethonqubo efanele.

3. Ukulandelana kwezintambo

Ukuze kuzuzwe izintambo ezingcono kakhulu zebhodi eliphrintiwe, ukulandelana kwezintambo kufanele kunqunywe ngokuvumelana nokuzwela kwemigqa yesignali ehlukahlukene ukuze i-crosstalk kanye nezidingo zokubambezeleka kokudluliselwa kwezintambo. Imigqa yesignali yezintambo ezibalulekile kufanele ibe mfushane ngangokunokwenzeka ukuze imigqa yazo exhumayo ibe mfushane ngangokunokwenzeka. Ngokuvamile, i-wiring kufanele ibe ngale ndlela elandelayo:

a) Ulayini wesiginali omncane we-analogi;

b) Imigqa yamasignali kanye nemigqa emincane yamasignali ezwela kakhulu ku-crosstalk;

c) Ulayini wesignali yewashi lesistimu;

d) Olayini abangamasignali abanezidingo eziphezulu zokubambezeleka kokudluliswa kwezintambo;

e) Ulayini wesignali jikelele;

f) Ulayini ongaba khona ongashintshi noma ezinye izintambo ezisizayo.