NREL Pyrheliometer Comparisons: 22 September - 3 October 2008 (NPC-2008)

Research output: NRELTechnical Report


NREL Pyrheliometer Comparisons (NPCs) are held annually at the Solar Radiation Research Laboratory (SRRL) in Golden, Colorado. Open to all pyrheliometer owner/operators, the NPC provides an opportunity to determine the unique WRR transfer factor for each participating pyrheliometer. This paper reports on the results of NPC-2008, which was scheduled from September 22 to October 3, 2008.
Original languageAmerican English
Number of pages54
StatePublished - 2009

NREL Publication Number

  • NREL/TP-550-45016


  • National Renewable Energy Laboratory (NREL)
  • NREL
  • pyrheliometers
  • solar irradiance
  • SRRL
  • world radiometric reference
  • World Standard Group
  • WRR
  • WSG


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