DQRID : D960914.17
Start DateStart TimeEnd DateEnd Time Data Quality Metric
03/26/1994000003/27/19962359Suspect
more
Subject:
SGP/MFR10m/C1 - Small intermittent time stamp error
DataStreams:sgpmfr10mC1.b1, sgpmfr10mC1.a0
Description:
The internal code that runs the MFR data logger had a bug that occasionally caused the 
time stamp associated with the data to be slightly in error.  This error is thought to be 
very small (say less than 30 seconds) and very infrequent.  (Unfortunately, we cannot give 
firm estimates of the magnitude and frequency of the error).

Also, the upwelling MFR measurements were contaminated by electrical noise originating 
from the heater contained in the sensor head.  During the time the sensor head was polled by 
the data logger, the heater would strobe "on and off", and the noise caused by this 
strobing could greatly contaminate the data.  Some of the data is so contaminated that it is 
virtually useless.   

After 96/03/27 these problems were corrected.  Those who use the data before this time 
should realize that the time stamp for each record of data might be slightly in error, and 
the data could be very noisy due to the heater switching on and off.
Suggestions: 
Measurements:sgpmfr10mC1.b1:
  • up_hemisp_broadband
  • up_hemisp_narrowband_filter6
  • up_hemisp_narrowband_filter4
  • up_hemisp_narrowband_filter5
  • cosine_solar_zenith_angle
  • logger_volt
  • up_hemisp_narrowband_filter2
  • up_hemisp_narrowband_filter3
  • base_time
  • up_hemisp_narrowband_filter1
  • time_offset
  • callang_flags
  • head_temp
more
sgpmfr10mC1.a0:
  • base_time
  • up_hemisp_broadband
  • logger_volt
  • callang_flags
  • time_offset
  • up_hemisp_narrowband_filter1
  • up_hemisp_narrowband_filter3
  • up_hemisp_narrowband_filter2
  • up_hemisp_narrowband_filter5
  • up_hemisp_narrowband_filter4
  • up_hemisp_narrowband_filter6
  • head_temp
more

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