Calibration Troubleshooting Investigate failed inspection results by checking instrument suitability, test points, uncertainty, setup, environment, method, and product condition. Contents Your Calibration Certificate Passed. Why Is the Part Still Failing Inspection? Calibration and inspection answer different questions Check the instrument Review the inspection method Check the specification Consider measurement uncertainty Investigate the part and process Keep the evidence together Inspection investigation checklist Continue the investigation Your Calibration Certificate Passed. Why Is the Part Still Failing Inspection? The instrument has a valid calibration certificate. The calibration result is acceptable. Yet, the part still fails inspection. This can seem contradictory when calibration and inspection are viewed as the same. They are not. Calibration checks how measurement standards match what a measuring system shows under specific conditions. Inspection chec...