'/2$&|&F%|Page #* H     d \'Table 5-3. SERI Instrument Calibration History and Estimated Measurement Uncertainty              ^Channel #^Measurement^Beginning^Instrument ^Pre- ^Post-^Comments^Estimated             ^Time Stamp ^Calibration^Calibration  ^Msmt                  ^Uncertainty(%)                               ^Direct normal R@^Eppley NIP 17828E6 w w^1.57% change ^ 3.3            ^(thermopile)                                       ^Global normal    ^None  ^--  ^--  ^--                        ^Global horiz.  R@ ^Eppley PSP 17863F3  w  w ^2.22% change  ^ 3.7         ^(thermopile)               ^at Welby                                ^at SRRL @^Eppley PSP 20079F3 !w x^0.73% change ^ 2.3                               ^Global tilt  ^None ^-- ^-- ^-- ^--                               ^Direct normal  ^None ^-- ^-- ^-- ^--            ^(silicon)                                     ^Temperature R@^Taylor Pocket 21430-1 v^(Due 10-91) ^--^ 0.2 (deg)                               ^Pressure ^Calc'd from elev. ^-- ^-- ^--                                ^Rel. hum. R@^Dickson 86100-1 _w x ^--^ 2(counts)                                ^Wind speed ^Observation ^-- ^-- ^-- ^--                                 ^Albedo ^-- ^None                                   ^11-14    ^-- ^Sun photometer   ^--  ^--  ^--  ^--       ! ! !"!^(relative comparisons only) ! ! ! ! !  !  !  !  !  ! " " " " " " " " "  "  "  "  "  " ##^Cloud Cover #^--#^Observed #^-- #^-- #^-- #^-- #  #  #  #  #  # $ $ $ $ $ $ $ $ $  $  $  $  $  $ %%^Global horiz. %^--%^LI-COR Pyr. PY1245 %w %w%^3.67% change %^ 2.9 %  %  %  %  %  % &&^(silicon) &&^(stability monitor only) & & & & &  &  &  &  &  & ' ' ' ' ' ' ' ' '  '  '  '  '  '