European ISO/IEC 17025 calibration service · info@lightinglab.eu
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Ultimate Guide to CAS 140D Calibration
Long-form reference page for engineers responsible for ISO/IEC 17025 optical calibration.
When is calibration necessary?
Routine recalibration intervals depend on stability, usage, transport, environmental conditions and customer quality requirements. Instruments used as reference standards or in accredited laboratories generally require documented periodic calibration and full traceability.
Typical error sources
Wavelength drift
Spectral responsivity changes
Entrance optics replacement
Fiber ageing
Temperature influence
Detector non-linearity
Stray light
Software correction mismatch
Recommended calibration programme
Item
Typical review
Wavelength
Reference spectral lines
Radiometric response
Irradiance / Radiance
Repeatability
Multiple measurements
Linearity
Application dependent
Documentation
ISO/IEC 17025 certificate
Preparing the shipment
Include every optical accessory used in routine measurements.
Attach the previous calibration certificate.
Describe the intended application.
State whether 24-hour Express or 72-hour Priority service is required.
Frequently Asked Questions
Can Express calibration still be accredited?
Yes, when the requested measurands are inside the confirmed accredited scope.
Should fibers be calibrated together?
Usually yes, if they form part of the measurement chain.
Should integrating spheres be included?
If they are used as part of the calibrated system, including them is often appropriate.
