Meaning
Erroneous rejections occur when functional components are identified as defective by an automated test system. This false failure fallout creates unnecessary costs in high-volume electronics manufacturing because good parts are sent for rework or discarded. Inaccurate test limits or poor probe contact are common causes for these mistakes.
Gage Repeatability
Variations in the measurement equipment lead to inconsistent results on the same part. If the system cannot produce the same value twice, the likelihood of false failure fallout increases rapidly. Calibration of the instruments reduces this uncertainty.
Production Yield
Manufacturing efficiency drops when a high percentage of the output is flagged for defects that do not exist. Engineers monitor false failure fallout to distinguish between real process drift and issues with the test fixture itself. High fallout rates often hide genuine quality problems because the data becomes cluttered with noise.
Reducing these errors allows the quality team to focus on fixing the assembly line rather than the test bench. Accurate data improves yield.
Retest Protocol
Additional inspections are often implemented to recover these misidentified units. The presence of false failure fallout necessitates a clear path for confirming the status of a rejected item before it is scrapped.
