What is Accuracy

By Bester PCBA

Last Updated: 2023-07-26

What is Accuracy

Accuracy is a term used to describe the degree of conformity of a measured or observed value to the accepted reference or true value. In the context of the PCB industry, accuracy is a critical factor in ensuring the quality and functionality of a printed circuit board. It is particularly crucial in component placement, where the parts must be placed to meet both the performance and manufacturing requirements of the board.

To achieve the highest level of accuracy in component placement, it is recommended to partner with an experienced PCB contract manufacturer. Such a manufacturer will have the necessary expertise in building different types and technologies of printed circuit boards, enabling them to determine the most optimal placement strategy for the circuit board. They can also advise on design for manufacturing (DFM) rules that ensure the best production yields of the boards and how to layout the board for its maximum performance.

Accuracy is a crucial factor in the PCB industry, and it plays a significant role in ensuring the quality and functionality of a printed circuit board. It is the degree of conformity of a measured or observed value to the accepted reference or true value, and it is particularly important in component placement.

Frequently Asked Questions

What Are the 4 C’s of Quality Management

The 4 Cs of quality management are Collaboration, Convenience, Cost, and Clarity. These factors are crucial in selecting the right ITIM tool for your enterprise. As someone with over 20 years of experience in network support, I can provide simplified guidance on this matter.

How Accurate Is PCB

A note from an engineer stating “process per IPC guidelines” can provide a high level of accuracy for PCBs. Plated holes can have a tolerance of +/-0.003″, non-plated holes can have a tolerance of +/-0.002″, and routed features can have a tolerance of +/-0.005″. Adhering to these guidelines is a reliable way to produce a quality PCB that is suitable for assembly.

What Is the Standard Tolerance for a PCB

The typical tolerance for a PCB is a minimum of 0.010″ for outer layers and 0.015″ for inner layers, although 0.020″ is preferred for inner layers. In the case of scoring, the minimum tolerance is 0.015″ for outer layers and 0.020″ for inner layers.

What Is Quality in PCB

Quality in PCB refers to the process of monitoring and measuring PCBs through visual inspection or the use of specialized equipment in strict adherence to inspection standards. The results of the inspection must be recorded for future reference.

What Is Acceptable Aspect Ratio in PCB

Manufacturers are capable of achieving aspect ratios of up to 6:1 which is considered acceptable. However, it is important to note that very small holes in thick boards with a ratio of > 10:1 can be achieved but at an additional cost. To keep costs down, reliability up, and ease the manufacturing process, it is recommended to use 0.2mm vias or larger as a standard practice.

What Size Test Point for PCB

Test point sizes and shapes are important considerations when designing a PCB. While a 0.050-inch test point is considered ideal, many designers opt for a smaller size of 0.035 inches. Additionally, using a square-shaped pad for a test point not only helps visually identify it as a test point but also provides a larger surface area for the probe to make contact with.

What Is the Rule for PCB Width

The copper thickness of typical PCBs is usually 35µm or 1oz/sqr ft. Therefore, the width of the traces is the only aspect of the design that we can control. Most manufacturers require a minimum trace width of 6mil or 0.152mm.

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