DQRID : D980110.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
05/30/1997150012/31/19971520Incorrect
more
Subject:
SGP/EBBR/E19 - Battery Voltage Drop
DataStreams:sgp15ebbrE19.b1, sgp30ebbrE19.b1, sgp5ebbrE19.b1
Description:
EBBR battery voltage at E19, El Reno, OK declined to lower than acceptable
levels after long periods of clouds after initial installation.  The low
voltage condition worsened as Autumn progressed.  In November 1997 the
battery tested okay, but would not hold sufficient capacity at night or
during extended periods of clouds to keep the voltage high enough for the
EBBR to work properly.  At my request, the battery was replaced with a brand
new battery on 31 December 1997.  The new battery is presently maintaining
voltage level at night.

The voltage dropped to 10 volts or less many days before the battery change.
Voltages less than 10.3 volts affected a wide range of measured values, but
at different times.  When the voltage was much below 10 volts the home
signal became very large (several volts), a quirk of the AEM circuitry.
At various times, latent and sensible heat fluxes, soil temperature, air
temperature, relative humidity, vapor pressure, wind direction, soil heat
flux plate output, home signal, and atmospheric pressure (at least) were not
reported correctly by the CR10 datalogger.  At least the sensible and latent
heat fluxes should be considered to be incorrect when the battery voltage is
less than 10.3 volts.  The battery voltage is found in the 15 minute data.
Suggestions: 
Measurements:sgp30ebbrE19.b1:
  • vapor_pressure_top
  • temp_trh_bottom
  • corr_soil_heat_flow_1
  • corr_soil_heat_flow_2
  • corr_soil_heat_flow_3
  • corr_soil_heat_flow_4
  • temp_air_top
  • temp_trh_top
  • temp_air_bottom
  • soil_temp_3
  • soil_temp_4
  • soil_temp_1
  • soil_temp_2
  • soil_temp_5
  • rh_bottom_fraction
  • corr_soil_heat_flow_5
  • wspd_vec_mean
  • home_signal_15
  • soil_heat_flow_1
  • vapor_pressure_bottom
  • soil_heat_flow_3
  • soil_heat_flow_2
  • soil_heat_flow_5
  • soil_heat_flow_4
  • home_signal_30
  • wdir_vec_std
  • atmos_pressure
  • latent_heat_flux
  • rh_top_fraction
  • sensible_heat_flux
  • wdir_vec_mean
more
sgp15ebbrE19.b1:
  • temp_air_right
  • soil_temp_3_rr
  • atmos_pressure_mv
  • rh_left_mv
  • soil_temp_2_rr
  • temp_air_left
  • wdir_vec_mean_mv
  • rh_right_mv
  • temp_trh_right_rr
  • battery_voltage
  • soil_temp_1_rr
  • soil_temp_5_rr
  • temp_trh_left_rr
  • soil_temp_4_rr
  • home_signal
more
sgp5ebbrE19.b1:
  • wdir_vec_mean
  • wspd_vec_mean
  • home_signal
  • rh_bottom_fraction
  • temp_air_bottom
  • vapor_pressure_bottom
  • temp_air_top
  • rh_top_fraction
  • temp_trh_bottom
  • atmos_pressure
  • wdir_vec_std
  • temp_trh_top
  • vapor_pressure_top
more

Close this window