AIDJEX Bulletin #40 - Polar Science Center - University of Washington

Laboratory calibration of the ADRAMS clock shows temperature sensitivity
as Parge as one part in IO5 in 8OC (Fig. 11). Errors of a few tenths of
a nillibar could be expected due to temperature effects on the clock.
ile it would be possible, in principle, to measure the temperature of
thn9 clock and to compensate (as is done with the pressure sensor), this
would require laboratory temperature calibrations of the clock and another
in situ temperature measurement, as well as additional data transmission.
This approach would do nothing to correct for the aging of the time base.
Fortunately, transmission of data through the satellite provides a
means of measuring and correcting for the actual variations in the buoy
clock, since accurate time measurements are associated with each data recep-
~iow. It is necessary that the same clock be used to gate the barometer
counts and to regulate the transmission intervals of the buoy, preferably
without analog timing circuits involved in controlling the transmission
interval. ADRATIS circuits meet these requirements e
.- -20 0 20
MPERATURE O C
Fig. 11. Tenperature sensitivity of the clock for buoy 1663 from
laboratory calibration.
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