An anonymised, representative calibration scenario illustrating common risks in professional optical measurements.
Unexpected change in luminance and chromaticity control data.
A reference check showed a gradual shift that could not be explained by the product. The instrument configuration, detector response and wavelength behaviour were reviewed before a full recalibration.
Calibration results are only useful when the measurand, instrument configuration and later application match. A valid certificate for the wrong configuration does not control measurement risk.
The calibration programme separated wavelength, radiometric response and repeatability effects. The customer could distinguish instrument drift from process drift and update the internal control limits.
