Description: | A SKYRAD lens (S921) was put on a spare IRT that was configured and
calibrated with a GNDRAD lens (M6) and the spare (with the wrong lens)
was used to replace the SKYRAD IRT. Here is Kevin Widener's explanation:
"Several weeks ago we experienced an intermittant failure of the SKYRAD IRT. It
was outputing voltages greater than 10 vdc which was upsetting the Coastal data
logger and adjacent channels. Since we had one spare (an IRT with GNDRAD lens),
we swapped the lenses on 3/28/98 and sent the bad IRT back to the mainland. We
have come to learn that the IRTs are calibrated with their lenses and we can't
just swap the lens."
The SKYRAD IRT was replaced on 4/23/98 with a spare that was properly calibrated
with a SKYRAD lens. At this time the IRT and datalogger were configured to
decrease the minumum measurable temperature from -50 to -60 C and to increase
the temperature resolution four times. |