| Description: | Sensor offset values are calculated each night, and at SGP, are applied at 1900 UTC each
day. Typically there is very little variation from night-to-night. At EF-34 we were
seeing significant steps in the data at 1900 UTC that were attributed to the offset values
changing substantially. The cause looks like it might be the linear heater board that was
in place during the period covered by this DQR. Note that we replaced the heater board
on 20120702 which is a bit more than two months after the end of this DQR. No steps were
seen after 20120424. The reason likely being by the 24th it was well into spring and
approaching summer, and large air temperature changes from day-to-day were not occurring.
Without getting into the gory details here, nighttime offset values are strongly
influenced by ambient temperature. Below is a list of days when a step is seen at 1900 UTC:
201201: 2, 3, 5, 12, 17, 26
201202: 5, 11, 24, 26
201203: 13
201204: 24 |