Description: | An insitu test comparing the Gndrad PIR and the Gndrad IRT at the NSA was performed from 6
Jan 2005 to 12 Jan 2005. The radiometer mentor requested the Eppley single calibration
coefficient for the PIR replace the 4 coefficients method developed by NREL. The Grndrad
PIR compared closer to the Gndrad IRT during this period. However, the radiometer mentor
believes the 4 coefficient PIR irradiance measurements remains superior to the single
coefficient Eppley PIR measurement method. Further questions should be directed to the
radiometer instrument mentor. |