DQRID : D980413.4
Start DateStart TimeEnd DateEnd Time Data Quality Metric
01/09/1998103001/14/19981715Incorrect
more
Subject:
SGP/EBBR/E4 - EBBR E4 Low Battery - Resulting In Incorrect Data
DataStreams:sgp30ebbrE4.b1, sgp15ebbrE4.b1, sgp5ebbrE4.b1
Description:
A low battery condition (less than 10.5 volts) caused a number of data
fields to be incorrect at some times and all data fields to be incorrect
at a more limited number of times.  All data fields are suspect when the
battery voltage drops below 10.5 volts because the CR10 cannot operate 
properly.  Some sensors are affected slightly (i.e. pressure) at slightly
larger voltages.  The low battery condition resulted from an initially 
weak battery and a week of extremely low solar radiation (from heavy 
cloudiness) on the solar panel that provides most of the charging of the
battery. 

Comments added by Marv Wesely: 
David Cook has been working with Dave Breedlove to try to assess the age
of the batteries.  The dates on the batteries need to be read during 
site visits and provided to David C.  It's quite possible that they need
to be replaced.  It's work in progress, though slow at times.
Suggestions: 
Measurements:sgp30ebbrE4.b1:
  • temp_air_bottom
  • soil_moisture_2
  • soil_moisture_1
  • wdir_vec_mean
  • lon
  • rh_bottom_fraction
  • temp_trh_top
  • soil_heat_capacity_4
  • soil_heat_capacity_5
  • soil_heat_capacity_2
  • soil_heat_capacity_3
  • soil_moisture_4
  • soil_moisture_3
  • soil_moisture_5
  • net_radiation
  • soil_heat_capacity_1
  • base_time
  • corr_soil_heat_flow_3
  • corr_soil_heat_flow_4
  • corr_soil_heat_flow_5
  • soil_heat_flow_1
  • soil_heat_flow_3
  • soil_heat_flow_2
  • soil_heat_flow_5
  • soil_heat_flow_4
  • wdir_vec_std
  • corr_soil_heat_flow_1
  • corr_soil_heat_flow_2
  • soil_temp_5
  • soil_temp_4
  • soil_temp_3
  • soil_temp_2
  • soil_temp_1
  • home_signal_30
  • sensible_heat_flux
  • wspd_arith_mean
  • temp_air_top
  • rh_top_fraction
  • atmos_pressure
  • temp_trh_bottom
  • wspd_vec_mean
  • surface_soil_heat_flux_avg
  • energy_storage_change_3
  • energy_storage_change_2
  • energy_storage_change_1
  • energy_storage_change_5
  • energy_storage_change_4
  • home_signal_15
  • lat
  • vapor_pressure_top
  • alt
  • vapor_pressure_bottom
  • bowen_ratio
  • temp_reference
  • surface_soil_heat_flux_5
  • surface_soil_heat_flux_3
  • surface_soil_heat_flux_4
  • surface_soil_heat_flux_1
  • time_offset
  • surface_soil_heat_flux_2
  • latent_heat_flux
more
sgp5ebbrE4.b1:
  • wspd_arith_mean
  • lon
  • rh_top_fraction
  • temp_trh_bottom
  • home_signal
  • atmos_pressure
  • temp_trh_top
  • rh_bottom_fraction
  • alt
  • net_radiation
  • lat
  • wdir_vec_mean
  • temp_air_bottom
  • wspd_vec_mean
  • base_time
  • vapor_pressure_top
  • vapor_pressure_bottom
  • temp_air_top
  • time_offset
  • wdir_vec_std
  • temp_reference
more
sgp15ebbrE4.b1:
  • wspd_arith_mean
  • soil_heat_flow_3_mv
  • base_time
  • soil_moisture_1_r
  • lon
  • soil_moisture_5_r
  • soil_temp_4_rr
  • atmos_pressure_mv
  • temp_reference_rr
  • temp_air_right
  • soil_temp_1_rr
  • soil_heat_flow_5_mv
  • soil_moisture_2_r
  • temp_air_left
  • rh_right_mv
  • soil_temp_3_rr
  • soil_moisture_3_r
  • temp_trh_right_rr
  • wdir_vec_mean_mv
  • soil_heat_flow_2_mv
  • home_signal
  • battery_voltage
  • temp_trh_left_rr
  • soil_heat_flow_1_mv
  • soil_temp_5_rr
  • soil_moisture_4_r
  • rh_left_mv
  • lat
  • time_offset
  • alt
  • soil_temp_2_rr
  • soil_heat_flow_4_mv
  • net_radiation_mv
more

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