What is the method for measuring profile readings for profiles greater than 5 mils?

The method for measuring profile readings for profiles greater than 5 mils requires a precise and representative measurement strategy, which is why taking multiple measurements to make one reading is essential. This approach ensures that any variations or anomalies in the surface profile are taken into account, providing a more accurate average reading.

When measuring surface profiles, especially those that exceed 5 mils, it is critical to capture enough data points to understand the profile's characteristics accurately. By taking ten measurements, the inspector can account for potential inconsistencies in the substrate surface and obtain a reliable average. This method aligns with best practices in coating inspections, ensuring that the coating is applied correctly for optimal adhesion and performance.

The other methods mentioned in the options might not provide sufficient accuracy or reliability for profiles greater than 5 mils. For instance, using profile tape with only three measurements may not capture enough data for high-profile readings, while measuring at a specific distance from the edge could lead to unrepresentative results. Additionally, while a micrometer can measure thickness, it does not effectively capture the surface profile's variations across a broader area. Therefore, taking ten measurements to form one reading is the best practice for achieving precise profile assessments.