DQRID : D020717.39
Start DateStart TimeEnd DateEnd Time Data Quality Metric
06/01/2002211506/30/20022356Suspect
more
Subject:
SGP/EBBR/E26 - Multiplexer 2 Failure From High Temperature
DataStreams:sgp30ebbrE26.b1, sgp5ebbrE26.b1, sgp15ebbrE26.b1
Description:
Multiplexer 2 is failing during times of control box temperatures above 29 degrees C.  The 
failure begins in the last channel and progresses to lower channels as the temperature 
increases.  It has not yet been determined whether the failure is in the relays or a solid 
state component of the multiplexer.  This condition is probably due to the aging of the 
device and the millions of cycles that this 10 year old device has made.  More failures 
of this sort may occur in the future.  A cure is being sought aside from replacement of 
the multiplexers to prevent the problem.

The indicated measurements need to be inspected to determine which ones are usable.
Suggestions: 
Measurements:sgp5ebbrE26.b1:
  • vapor_pressure_bottom
  • temp_air_bottom
  • vapor_pressure_top
  • temp_air_top
more
sgp15ebbrE26.b1:
  • temp_air_right
  • temp_air_left
more
sgp30ebbrE26.b1:
  • bowen_ratio
  • surface_soil_heat_flux_5
  • temp_air_top
  • latent_heat_flux
  • surface_soil_heat_flux_3
  • surface_soil_heat_flux_4
  • temp_air_bottom
  • corr_soil_heat_flow_5
  • vapor_pressure_top
  • corr_soil_heat_flow_4
  • corr_soil_heat_flow_3
  • soil_heat_flow_4
  • sensible_heat_flux
  • soil_heat_flow_5
  • surface_soil_heat_flux_avg
  • vapor_pressure_bottom
  • soil_heat_flow_3
more

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