Pyrheliometer Comparisons are an important way of ensuring traceability. Several pyrheliometer comparisons are held each year, where users with their equipment gather in order to compare, validate and calibrate their reference radiometers.
The most important event is the International Pyrheliometer Comparison (IPC), held at the World Radiation Center (WRC) in Davos every five years. During the IPC the World Radiometric Reference (WRR) is validated, and the world standard is redistributed to all participants.
Several regional comparisons held at different locations in the world redistribute the standard and IPC participants to validate their reference radiometer calibration against other regional references.
Besides the validation and calibration of pyrheliometers, these events are supporting the build-up of knowledge and the exchange within the solar radiation community. Davos Instruments frequently participates in these events in order to ensure the high quality of its instruments and to support its customers.