DQRID : D020717.39
Start DateStart TimeEnd DateEnd Time
06/01/2002211506/30/20022356
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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:
  • Bottom vapor pressure(vapor_pressure_bottom)
  • Bottom air temperature(temp_air_bottom)
  • Top vapor pressure(vapor_pressure_top)
  • Top air temperature(temp_air_top)
more
sgp15ebbrE26.b1:
  • Right air temperature(temp_air_right)
  • Left air temperature(temp_air_left)
more
sgp30ebbrE26.b1:
  • Bowen ratio(bowen_ratio)
  • Surface soil heat flux 5(surface_soil_heat_flux_5)
  • Top air temperature(temp_air_top)
  • Surface latent heat flux(latent_heat_flux)
  • Surface soil heat flux 3(surface_soil_heat_flux_3)
  • Surface soil heat flux 4(surface_soil_heat_flux_4)
  • Bottom air temperature(temp_air_bottom)
  • Soil heat flow 5, corrected for soil moisture(corr_soil_heat_flow_5)
  • Top vapor pressure(vapor_pressure_top)
  • Soil heat flow 4, corrected for soil moisture(corr_soil_heat_flow_4)
  • Soil heat flow 3, corrected for soil moisture(corr_soil_heat_flow_3)
  • Soil heat flow 4(soil_heat_flow_4)
  • Surface sensible heat flux(sensible_heat_flux)
  • Soil heat flow 5(soil_heat_flow_5)
  • Surface soil heat flux, average of fluxes 1-5(surface_soil_heat_flux_avg)
  • Bottom vapor pressure(vapor_pressure_bottom)
  • Soil heat flow 3(soil_heat_flow_3)
more

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