SGP/MET/E21 - TimeCheck Error

Starting on 2010-06-07 the E21 system clock started drifting until the problem was 
corrected on 2010-06-29.  The maximum daily offset reported in the collection logs were:

Jun 7 offset:	  -5.04
Jun 8  Offset:	  -267.449039
Jun 9  Offset:	  -541.038624
Jun 10 Offset:	  -814.469141
Jun 11 Offset:	  -1076.862114
Jun 12 Offset:	  -1350.330223
Jun 13 Offset:	  -1623.639335
Jun 14 Offset:	  -1897.047754
Jun 15 Offset:	  -2170.552312
Jun 16 Offset:	  -2422.130746
Jun 17 Offset:	  -2684.607495
Jun 18 - Jun 22 (unknown)
Jun 23 Offset:	  -4204.730579

If the E21 system clock drifts the E21 Datalogger clocks will be set to the same incorrect 
time. The met data will be correct but the corresponding time stamp cannot be accurately 
known or simply corrected.

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• Relative humidity observed by the Raman lidar(rh_mean)
• Temperature mean(temp_mean)
• time_in_seconds_since_volume_start(time)
• base time in epoch(base_time)
• TBRG precipitation total(tbrg_precip_total)
• Quality check results on field: TBRG precipitation total, corrected(qc_tbrg_precip_total_corr)
• TBRG precipitation total, corrected(tbrg_precip_total_corr)
• Quality check results on field: Relative humidity mean(qc_rh_mean)
• Wind direction vector mean(wdir_vec_mean)
• Vapor pressure mean, calculated(vapor_pressure_mean)
• Quality check results on field: Wind direction vector mean(qc_wdir_vec_mean)
• Wind direction vector mean standard deviation(wdir_vec_std)
• Quality check results on field: Wind speed vector mean(qc_wspd_vec_mean)
• Atmospheric pressure(atmos_pressure)
• Quality check results on field: TBRG precipitation total(qc_tbrg_precip_total)
• Quality check results on field: Wind direction vector mean standard deviation(qc_wdir_vec_std)
• Quality check results on field: Wind speed arithmetic mean(qc_wspd_arith_mean)
• Results of quality checks on sample time(qc_time)
• Wind speed arithmetic mean(wspd_arith_mean)
• Time offset from base_time(time_offset)
• Wind speed vector mean(wspd_vec_mean)
• Quality check results on field: Temperature mean(qc_temp_mean)
• Quality check results on field: Atmospheric pressure(qc_atmos_pressure)
• Quality check results on field: Vapor pressure mean, calculated(qc_vapor_pressure_mean)