DQRID : D141210.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
09/28/2012203701/11/20130500Suspect
05/14/2013160010/07/20131100Suspect
more
Subject:
MAG/CCN/M1 - Problem with time fields
DataStreams:magaosccn100M1.a1
Description:
During the deployment the instrument time for the CCN was not automatically synched and 
tended to drift relative to the time corrected by a time server. In addition, the clock was 
set 1 hour off during the first time range.  

During the first time range the CCN time was fast from ~55 to 72 minutes

During the second time range the CCN time was fast from ~1 to 10 minutes.  

These approximations were determined by comparing the time of spikes in UHSAS CPC data and 
are very rough.

A document attached to DQPR 4362 shows the time of the peaks used to approximate the error 
in the time.
Suggestions: 
Use the data averaged over longer periods.  

Do a careful match of spike
s with 
other datastreams to figure out the time differences.
Measurements:magaosccn100M1.a1:
  • CCN_T_sample
  • CCN_T_nafion
  • N_CCN_dN
  • CCN_temp_unstable_flag
  • CCN_proportional_valve_voltage
  • CCN_first_stage_monitor_voltage
  • CCN_super_saturation_calculated
  • CCN_Q_sheath
  • base_time
  • CCN_t_read_TEC2
  • CCN_t_read_TEC3
  • CCN_T_inlet
  • CCN_temperature_std
  • CCN_laser_current
  • CCN_t_read_TEC1
  • N_CCN_bin_number
  • CCN_Q_sample
  • CCN_P_sample
  • CCN_T_OPC
  • CCN_temperature_gradient
  • time_offset
  • N_CCN
  • time
  • CCN_ss_set
more

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