GB/T 5489-2018 in English

Explanation of professional terms and practical application cases

Grid Method: Dimensioning is done by using rectangular coordinates or polar coordinates, which is suitable for dimensioning complex printed circuit board graphics. For example, in multi-layer board design, the grid method can more clearly express the relative position relationship between layers.

Solder Mask Pattern: A key structure used to prevent short circuits between wires. In practical applications, high-density wiring areas usually use cut circular or elliptical pads to optimize space utilization and reduce welding risks.

Via Position Drawing: A drawing method that includes circular holes and special-shaped holes. For example, in drilling manufacturing, special-shaped holes need to be accurately marked with six parameter values to ensure processing accuracy and position accuracy.

Implementation suggestions

1. Design stage:

• Preferentially use automatic CAD tools for drawing to ensure the overlap accuracy of each layer of graphics.
• Choose the appropriate marking method (dimension line method, grid method or mixed method) according to the number of layers and complexity of the board.
• Use fine marking in high-density areas to avoid conductive graphics covering character graphics.

2. Manufacturing stage:

• Strictly follow the standard requirements for drilling and solder mask processes to ensure that parameters such as hole diameter and ring width meet the design requirements.
• Check the multi-layer board layer by layer to ensure that the dimensions of the isolation area and isolation plate are accurate.
• Use optical positioning marks to ensure the accuracy of surface mounted components.

3. Inspection stage:

• Focus on checking the hole pattern and solder mask pattern to ensure that the hole diameter classification is clear and the solder mask film is fully covered.
• Use professional testing equipment to verify whether the minimum spacing of the conductive pattern and the distance of the isolation area meet the requirements.