NETWORK AND TRACEABILITY OF THE RADIOMETRIC AND PHOTOMETRIC STANDARDS AT THE PTB

The system of radiometric and photometric standards at the PTB is presented, emphasizing traceability, cross-linking, and future developments. Traceability from the national standards to the respective reference standards of calibration laboratories of the German Calibration Service (DKD) is also included. The future realization of the detector-based spectral irradiance scale resulting in a reduced uncertainty is described.