Calibration Troubleshooting A current calibration status does not control setup, environment, method, handling, operator technique, or suitability. Review the full measurement process. Contents Your Instrument Is Calibrated. Why Can the Measurement Still Be Wrong? Contents The problem starts with a valid certificate A practical measurement problem How to investigate the result Check the instrument first Then check the measurement method Check range and capability Look at measurement uncertainty Check metrological traceability Check the environment and setup Look at the manufacturing process Your Instrument Is Calibrated. Why Can the Measurement Still Be Wrong? A calibration certificate can be valid while a measurement process still produces a result that is unsuitable for a particular decision. This situation creates a common problem in inspection and quality control. An instrument has a current calibration certificate. The operator uses it correctly according to the n...