Medical Apparatus Blood Pressure Monitor PCBA

How can I check the quality of PCB?

PCB first distinguishes the material from the board surface, then the color, copper, and smell are compared. Generally, there are the following types:
Single-sided cardboard is the cheapest, easy to deform and break. It can only be used as a single-sided board. The color of the component surface is yellow with an irritating odor, and the copper coating is rough and thin.
Single-sided half-glass board, the cost is slightly higher, and the strength is higher than that of the cardboard. Both sides are green, and the copper coating is better than the cardboard and has no smell
Rogers PCB, metal base printed board, ARLON PCB, high cost, good strength. It can be used as Heavy copper board, Ceramic PCB, HDI High Quality PCB Products. Multilayer boards are mostly used in high-end products. The copper coating can be made very precise and thin, and the unit board is relatively heavy. .
Followed by PCB
Green oil: uneven ink, ink blistering, ink scratches, copper exposure, ink peeling, bad plug holes, ink garbage. . .
Character words: fuzzy, fat, incomplete, offset. . .
Surface treatment: Only the color can be seen from the appearance. . If you spray tin, you can also see that the tin thickness is uniform.