PCB News - Teach you how to identify a good circuit board

1. Judge the appearance with the help of professional tools.

a. The dimensional characteristics of the circuit board: including the size and thickness of the printed circuit board, aperture and pattern accuracy, wire width and spacing, coincidence degree and ring width.

b. Look at the ink color.

The outer layer of the PCB circuit board is covered with ink. The ink can play the role of copper circuit insulation and anti-oxidation. If the color of the board is not bright enough, it means that the manufacturer is cutting corners in the amount of ink used, which will inevitably affect the quality of the board.

c. Look at the pad solder joints

Modern electronic technology is becoming more and more miniaturized and refined. Circuit boards are becoming more and more high-density, high-frequency and high-speed development, HDI circuit boards are also popular. Therefore, the line width and line spacing on the board are getting smaller and denser.

This requires the use of professional tools and equipment to check whether the line is open or short-circuited. Whether the surface solder mask coating has defects such as misalignment, blistering, bubbles, delamination, adhesion, trauma, and thickness deviation.

d. Look at surface defects

Check whether there are defects such as burrs, nicks, scratches, grooves, fiber scratches, exposed fabrics and voids on the surface of the PCB board;

e. Defects under the surface of the circuit board: foreign debris, white spots/microcracks, delamination, pink rings and laminated voids;

f. Wire defects: decrease in adhesion, reduction of wire width and thickness due to gaps, points, scratches, surface plating or coating defects, etc.;

g. Hole characteristics: aperture size, misalignment, foreign debris and defects in plating or coating;

h. Abnormal identification: including the location, identification, size, readability and accuracy of various electronic components;

2. Judging from the quality specification requirements of the PCB board itself.

a. The circuit board must meet various electrical testing requirements after SMT patch installation.

b. After the actual machine test, the board must not have abnormal heating, open circuit, and short circuit;

c. Under the reasonable environment of the machine, the copper skin of the circuit board should not be delaminated or peeled off from the base material;

d. The surface of the copper wire of the board should not be easily oxidized.

e. There is no additional electromagnetic radiation phenomenon;

f. The shape of the PCB circuit board is not deformed, and the hole position and circuit deformation of the circuit board should be within the allowable reasonable range.

The above is an introduction on how to identify a good circuit board. Ipcb is also provided to PCB manufacturers and PCB manufacturing technology.

g. The board should have the ability to withstand high temperature, high humidity and special environment.

Finally, the editor wants to emphasize that for PCB proofing, customization, and board manufacturing, you must find a powerful PCB Allegro factory. Only powerful manufacturers like Benqiang Circuit can have high-end and precise PCB production testing. Equipment and a complete product quality control system can strive to achieve the best quality of the board.