Calibrations

All calibrations at Eppley are performed according to internationally accepted techniques and procedures with traceability to the proper World Standards.

Pyrheliometers (sNIP, NIP) are compared on Eppley’s Research Building Roof Platform according to procedures described in ISO 9059 and Technical Procedure, TP04 of The Eppley Laboratory, Inc.’s Quality Assurance Manual on Calibrations and are traceable to the World Radiation Reference (WRR) through comparisons with Eppley’s AHF standard self-calibrating cavity pyrheliometers which participate at the International Pyrheliometric Comparisons (IPC).

Pyranometers (SPP, PSP, 8-48) are compared in Eppley’s Integrating Hemisphere according to procedures described in ISO 9847 Section 5.3.1 and Technical Procedure, TP01 of The Eppley Laboratory, Inc.’s Quality Assurance Manual on Calibrations and are traceable to the World Radiation Reference (WRR) through comparisons with Eppley’s AHF standard self-calibrating cavity pyrheliometers which participate at the International Pyrheliometric Comparisons (IPC).

Pyrgeometers (PIR) are compared in Eppley’s Blackbody Calibration System according to Technical Procedure, TP05 of The Eppley Laboratory, Inc.’s Quality Assurance Manual on Calibrations and are traceable to the International Practical Temperature Scale (IPTS) and to the World Infrared Standard Group (WISG).

Total Ultraviolet Radiometers (TUVR) are compared on Eppley’s Research Building Roof Platform according to procedures described Technical Procedure, TP03 of The Eppley Laboratory, Inc.’s Quality Assurance Manual on Calibrations and are traceable to the National Institute of Standards and Technology (NIST).

Eppley recommends a minimum calibration cycle of five (5) years but encourages annual calibrations for highest measurement accuracy.