PCB mbadamba impedance na-ezo aka na paramita nke nguzogide na mmeghachi omume, nke na-egbochi mgbanwe nke ugbu a. Na mmepụta nke PCB sekit mbadamba, impedance nhazi dị mkpa. Gịnị mere PCB sekit mbadamba mkpa impedance?

1. The PCB sekit (ala nke osisi) kwesịrị ịtụle plugging na wụnye electronic components, na conductivity na mgbaàmà nnyefe arụ ọrụ kwesịkwara-atụle mgbe e mesịrị SMT patch na plugged. Ya mere, ala nke impedance, nke ka mma, karịsịa mgbaàmà ngwa ndakwa nri. Maka akụrụngwa, ihe achọrọ maka resistivity bụ: ihe na-erughị 1&TIME; 10-6 kwa centimita square.

2. Na mmepụta usoro nke pcb sekit mbadamba, ha ga-aga site na usoro dị ka ọla kọpa imikpu, tin plating (ma ọ bụ chemical plating, ma ọ bụ thermal ịgba tin), njikọ soldering, wdg, na ihe eji na ndị a njikọ ga-hụ n’anya. na resistivity dị ala, iji hụ na nkwekọ zuru oke nke bọọdụ sekit dị ala iji zute ngwaahịa dị mma chọrọ ma nwee ike ịrụ ọrụ nke ọma.

Nke atọ, ntinye tin nke bọọdụ sekit pcb bụ nke kachasị nwee nsogbu na mmepụta nke bọọdụ sekit dum, ọ bụkwa isi njikọ nke na-emetụta impedance. Nnukwu ntụpọ nke mkpuchi tin electroless bụ mfe nghọta (dị mfe oxidized ma ọ bụ deliquescent) na ogbenye solderability, nke ga-eduga siri ike soldering nke sekit osisi, elu impedance, adịghị mma eletriki conductivity, ma ọ bụ akwusi ike nke n’ozuzu osisi arụmọrụ.

4. Enwere mgbasa ozi mgbaàmà dị iche iche na ndị na-eduzi ụgbọ ala pcb. Mgbe a ga-abawanye ugboro ugboro iji mee ka ọnụego nnyefe ya dịkwuo elu, ma ọ bụrụ na sekit n’onwe ya dị iche iche n’ihi ihe ndị dị ka etching, oke njupụta, obosara waya, wdg, uru impedance ga-agbanwe. , Ya mere na mgbaàmà ya na-agbagọ na arụ ọrụ nke eriri sekit na-emebi emebi, n’ihi ya, ọ dị mkpa iji chịkwaa uru impedance n’ime ebe ụfọdụ.