How to check the quality of PCB?
There are many PCB manufacturers, the quality of PCBs are with quit a big difference. Customers who are not very familiar with PCBs could be hard to assure the quality. PCBs with bad quality can be scratched or crack easily, the precision and performance are not enough to support the reliability of customer’s product.
You can make a preliminary judge by view check:
1, dimension & appearance.
Measure the PCB dimension and compare with your design specification to check if it is meet the standards. Check if the PCB is bent.
2, silkscreen color.
Silkscreen is for insulation and circuit protection, if the color is not right or if there are silkscreen fault, the quality might be not good.
3, solder pad appearance.
Check if the solder pad are oxidized, if there are silkscreen oil on solder pad, if it will influence the components welding.
If you have professional equipment, you can further judge PCB quality from the following aspects:
1, If there is broken or open circuit?
2, If the circuit width, thickness, gap are normal?
3, If the copper will be damaged easily in high temp environment?
4, If the copper will be oxidized easily?
5, If there is extra electromagnetic radiation?
6, If the performance are stable in special environment, such as high humidity?
Hope above methods help you in choosing PCB.