An anonymised, representative calibration scenario illustrating common risks in professional optical measurements.
New fibre introduced after mechanical damage.
The spectrometer body had a valid certificate, but the optical fibre was part of the radiometric chain. Replacing it changed throughput and spectral behaviour.
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 complete configuration was recalibrated and the accessory identification was added to the documentation. The case shows why accessories should not be treated as interchangeable.
