How to check the quality of a PCB

[aym_qunibi]

when i look to a PCB, how can i know the quality and the professionality of that pcb so i can use that manufacturer :?:

 

[vij]

Re: PCB quality

pcb quality depends up on no of factors
1) whether manufacterer able to manufactor board with proscribed design rules
like clearance between wire to wire ,wire to pad ,wire to via ,via to via etc ,
2)min trace width with which he can manufacture
3)min diameter via he can achieve ,bcz for high density interconnect via with dia 6 or 8 mils are used ,this can only achieved by only advance manufactering technology .
4)ability to maitain controled impedance for traces ,

5)multilayer pcb manufactoring capabilty as per ur requirement like 18 layer board

if manufacturer can provide like these facalities then he is ok

vij

 

[pvskt]

Re: PCB quality

Well, simple visual checks:

1) Observe the silkscreen printing on the board layout. This itslef will tell you the quality of work.

2) Take a convex lens and observe the soldermask opening alignment...you will observe some mis-registration if the quality of work is bad.

3) Hold the board vertically and view it from its side..check out for warpage on the board.

4) Inspect the drill holes on the bare PCB. On similar lines like point 3 above, check for the drill mismatch.