Kodi Njira Zoyendera Zaukhondo za PCBA Ndi Chiyani?

Njira yowunika zowonera

Pogwiritsa ntchito galasi lokulitsa (X5) kapena microscope ya kuwala ku PCBA, khalidwe la kuyeretsa limawunikidwa poyang'ana kukhalapo kwa zotsalira zolimba za solder, doss ndi malata, tinthu tating'ono tachitsulo ndi zonyansa zina.Nthawi zambiri pamafunika kuti PCBA pamwamba ikhale yoyera momwe ndingathere komanso kuti palibe zotsalira kapena zonyansa zomwe ziyenera kuwoneka.Ichi ndi chisonyezo chamkhalidwe ndipo nthawi zambiri chimayang'ana pa zomwe wogwiritsa ntchito amafuna, njira zawo zoyeserera komanso kuchuluka kwa makulidwe omwe amagwiritsidwa ntchito pakuwunika.Njirayi imadziwika ndi kuphweka kwake komanso kugwiritsa ntchito mosavuta.Choyipa ndichakuti sikutheka kuyang'ana zonyansa pansi pazigawo ndi zotsalira za ionic ndipo ndizoyenera kugwiritsa ntchito zovuta kwambiri.

Zosungunulira M'zigawo Njira

Njira yochotsera zosungunulira imadziwikanso kuti ionic contaminant content test.Ndi mtundu wa ionic zoipitsa zili pafupifupi mayeso, mayeso ambiri ntchito IPC njira (IPC-TM-610.2.3.25), ndi kutsukidwa PCBA, kumizidwa mu ionic digiri kuipitsidwa Tester mayeso njira (75% ± 2% isopropyl koyera. mowa kuphatikiza 25% DI madzi), zotsalira za ayoni zidzasungunuka mu zosungunulira, sonkhanitsani mosamala zosungunulira, dziwani kuti resistivity yake.

Zowonongeka za Ionic nthawi zambiri zimachokera ku zinthu zogwira ntchito za solder, monga ma halogen ions, ayoni a asidi, ndi ayoni achitsulo kuchokera ku dzimbiri, ndipo zotsatira zake zimawonetsedwa ngati chiwerengero cha sodium chloride (NaCl) yofanana ndi gawo lililonse.Ndiko kuti, chiwerengero chonse cha zonyansa za ionic (kuphatikizapo zomwe zingathe kusungunuka mu zosungunulira) ndizofanana ndi kuchuluka kwa NaCl, osati kwenikweni kapena kupezeka kokha pamwamba pa PCBA.

Mayeso a Surface Insulation Resistance Test (SIR)

Njirayi imayesa kukana kwapakatikati kwa ma conductor pa PCBA.Muyeso wa kukana kutchinjiriza pamwamba kumawonetsa kutayikira chifukwa cha kuipitsidwa pansi pamikhalidwe yosiyanasiyana ya kutentha, chinyezi, magetsi ndi nthawi.Ubwino ndi molunjika komanso kachulukidwe muyeso;ndi kukhalapo kwa malo am'deralo a solder phala akhoza wapezeka.Monga kuchulukirachulukira yotsalira mu PCBA solder phala makamaka alipo mu msoko pakati pa chipangizo ndi PCB, makamaka olowa solder wa BGAs, amene n'zovuta kuchotsa, pofuna kutsimikizira kuyeretsa kwenikweni, kapena kutsimikizira chitetezo. (magetsi ntchito) wa solder phala ntchito, muyeso wa kukana padziko msoko pakati pa chigawo ndi PCB nthawi zambiri ntchito kuonetsetsa kuyeretsa zotsatira za PCBA.

Muyezo wamba wa SIR ndi kuyesa kwa maola 170 pa kutentha kwa 85 ° C, chinyezi cha 85% RH ndi kukondera kwa 100V.

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