DQRID : D110524.2
Start DateStart TimeEnd DateEnd Time Data Quality Metric
06/07/2010000006/29/20102359Incorrect
more
Subject:
SGP/MET/E21 - TimeCheck Error
DataStreams:sgpmetE21.b1
Description:
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.
Suggestions: 
The data time stamp cannot be considered accurate and hence users are advised to 

disregard this data.
Measurements:sgpmetE21.b1:
  • rh_mean
  • temp_mean
  • time
  • base_time
  • tbrg_precip_total
  • qc_tbrg_precip_total_corr
  • tbrg_precip_total_corr
  • qc_rh_mean
  • wdir_vec_mean
  • vapor_pressure_mean
  • qc_wdir_vec_mean
  • wdir_vec_std
  • qc_wspd_vec_mean
  • atmos_pressure
  • qc_tbrg_precip_total
  • qc_wdir_vec_std
  • qc_wspd_arith_mean
  • qc_time
  • wspd_arith_mean
  • time_offset
  • wspd_vec_mean
  • qc_temp_mean
  • qc_atmos_pressure
  • qc_vapor_pressure_mean
more

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