Channel # Measurement Beginning Instrument Pre- Post- Comments Estimated Time Stamp Calibration Calibration Measurement Uncertainty(%)
1 Direct normal 87328 Eppley NIP 17828E6 11-87 2-88 1.57% change 3.3 (thermopile) 2 Global normal None -- -- -- 3 Global horiz. 87328 Eppley PSP 17863F3 11-87 2-88 2.22% change 3.7 (thermopile) At Welby At SRRL 88057 Eppley PSP 20079F3 7-87 8-88 0.73% change 2.3 4 Global tilt None -- -- -- -- 5 Direct normal None -- -- -- -- (silicon) 6 Temperature 87328 Taylor Pocket 21430-1 10-86 (Due 10-91) -- 0.2 (deg) 7 Pressure Calc'd from elev. -- -- -- 8 Relative humidity 87328 Dickson 86100-1 9-87 10-88 -- 2(counts) 9 Wind speed Observation -- -- -- -- 10 Albedo -- None 11-14 -- Sun photometer (relative comparisons only) -- -- -- 15 Cloud Cover -- Observed -- -- -- -- 19 Global horiz. -- LI-COR Pyr. PY1245 11-87 2-88 3.67% change 2.9 (silicon) (stability monitor only)
Table 5-3. SERI Instrument Calibration History and Estimated Measurement Uncertainty.


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