Meaning
Statistical measurements of manufacturing variation compare the actual performance of a production line against the design tolerances established by engineering teams. Evaluating process capability ensures that RF calibration stages consistently produce boards within the narrow limits of international carrier standards. This analysis uses indices like CP and CPK to determine whether the assembly line is stable.
It allows factory managers to stop the line before out-of-spec products are manufactured.
Limit Distribution
Test records generated at the end of the line are gathered to build a histogram of module performance. Measuring process capability over thousands of units shows if the center of the distribution has shifted toward the lower limit. Corrective actions must follow when the calculated index drops.
Calibration Defect
Sub-optimal assembly processes yield high failure rates. Low capability scores indicate that the soldering or component placement machines need adjustments.
Quality Control
Rigorous control of the manufacturing parameters protects the product against component variation across different supplier batches. Tracking process capability continuously helps engineers identify when a tester has lost its calibration. Standardized procedures require a high capability index before a product line receives approval for high-volume runs.
This preventive tracking reduces the scrap rate and improves the first-pass yield of the assembly factory.
