DQRID : D050604.1
Start DateStart TimeEnd DateEnd Time
05/13/2005110005/13/20052000
05/28/2005173005/29/20051800
05/19/2005083005/24/20051800
05/31/2005150006/04/20050900
06/10/2005030006/10/20050400
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Subject:
NSA/SKYRAD/C1 - Datalogger grounding problem
DataStreams:nsaskyrad20sC1.a1, nsaskyrad60sC1.b1, nsaskyrad20sC1.a0, nsaskyradC1.00
Description:
Both PIRs reported unreasonable high readings with coincident low reading from the IRT. 
Since both PIR instruments exhibited exactly the same behaviour and the IRT an opposite 
response during large suspect data excursions this indicates that the false signal maybe the 
result of poor grounding. 

The PIR1,2 data and the IRT data are most adversely affected.  During the problem periods 
PIR irradiance increased (typ pos 200-300W/m2) while the IRT response was negative (typ 
neg 20-30W/m2) but followed the response of the PIR.  The Skyrad shortwave instruments 
were also affected but to much less extent (within their uncertainties).  Data quality flags 
are typically not triggered during these problem periods.

Data logger grounding was improved on 6/10 2005.  The problem hasn't re-occurred since 
that time.
Suggestions: 
null
Measurements:nsaskyradC1.00:
  • (Raw data stream - documentation not supported)
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nsaskyrad20sC1.a0:
  • Instantaneous Downwelling Hemispheric Shortwave, Pyranometer Thermopile Voltage(inst_global)
  • lon(lon)
  • Instantaneous Downwelling Pyrgeometer Thermopile, Shaded Pyrgeometer2(inst_down_long_hemisp_shaded2_tp)
  • Instantaneous Downwelling Pyrgeometer Case Thermistor Resistance, Shaded
    Pyrgeometer2(inst_down_long_shaded2_case_resist)
  • Instantaneous Downwelling Pyrgeometer Case Thermistor Resistance, Shaded
    Pyrgeometer1(inst_down_long_shaded1_case_resist)
  • -180.0 - +180.0(alt)
  • North Latitude(lat)
  • Instantaneous uncorrected downwelling shortwave diffuse, shaded pyranometer
    thermopile voltage(inst_diffuse)
  • base time in epoch(base_time)
  • Time offset from base_time(time_offset)
  • Instantaneous Sky/Cloud Infrared(inst_sky_ir_signal)
  • time_in_seconds_since_volume_start(time)
  • Instantaneous direct normal shortwave irradiance, pyrheliometer thermopile
    voltage(inst_direct_normal)
  • Instantaneous Downwelling Pyrgeometer Thermopile, Shaded Pyrgeometer1(inst_down_long_hemisp_shaded1_tp)
  • Instantaneous Downwelling Pyrgeometer Dome Thermistor Resistance, Shaded
    Pyrgeometer2(inst_down_long_shaded2_dome_resist)
  • Instantaneous Downwelling Pyrgeometer Dome Thermistor Resistance, Shaded
    Pyrgeometer1(inst_down_long_shaded1_dome_resist)
more
nsaskyrad20sC1.a1:
  • Instantaneous Uncorrected Downwelling Ultraviolet Irradiance, UV Biometer(inst_down_uvb_irradiance)
  • base time in epoch(base_time)
  • Instantaneous Downwelling Pyrgeometer Case Thermistor Resistance, Shaded
    Pyrgeometer(inst_down_long_shaded_case_resist)
  • Instantaneous PIR2 dome thermistor(pir2_dome_therm)
  • Instantaneous Downwelling Pyrgeometer Dome Thermistor Resistance, Unshaded
    Pyrgeometer(inst_down_long_unshaded_dome_resist)
  • Instantaneous PIR1 case thermistor(pir1_case_therm)
  • Instantaneous Downwelling Pyrgeometer Thermopile, Shaded Pyrgeometer2(inst_down_long_hemisp_shaded2_tp)
  • Instantaneous downwelling pyrgeometer dome thermistor resistance, shaded
    pyrgeometer(inst_down_long_shaded_dome_resist)
  • Time offset from base_time(time_offset)
  • Raw data filename(filename)
  • Instantaneous UVB temperature(uvb_temp)
  • Instantaneous PIR2 case thermistor(pir2_case_therm)
  • Instantaneous Downwelling Pyrgeometer Case Thermistor Resistance, Unshaded
    Pyrgeometer(inst_down_long_unshaded_case_resist)
  • Instantaneous Downwelling Pyrgeometer Dome Thermistor Resistance, Shaded
    Pyrgeometer2(inst_down_long_shaded2_dome_resist)
  • Instantaneous Downwelling Pyrgeometer Dome Thermistor Resistance, Shaded
    Pyrgeometer1(inst_down_long_shaded1_dome_resist)
  • Instantaneous PIR1 dome thermistor(pir1_dome_therm)
  • Instantaneous PIR1 uncorrected irradiance(pir1_uncorr_irradiance)
  • Instantaneous Downwelling Pyrgeometer Thermopile, Shaded Pyrgeometer1(inst_down_long_hemisp_shaded1_tp)
  • Instantaneous PIR2 uncorrected irradiance(pir2_uncorr_irradiance)
  • North Latitude(lat)
  • Instantaneous downwelling pyrgeometer thermopile voltage, shaded pyrgeometer(inst_down_long_hemisp_shaded_tp)
  • Instantaneous Downwelling Pyrgeometer Thermopile, Unshaded Pyrgeometer(inst_down_long_hemisp_unshaded_tp)
  • -180.0 - +180.0(alt)
  • Instantaneous UVB uncorrected irradiance(uvb_uncorr_irradiance)
  • lon(lon)
  • Instantaneous Downwelling Pyrgeometer Case Thermistor Resistance, Shaded
    Pyrgeometer2(inst_down_long_shaded2_case_resist)
  • Instantaneous Downwelling Pyrgeometer Case Thermistor Resistance, Shaded
    Pyrgeometer1(inst_down_long_shaded1_case_resist)
  • Instantaneous Downwelling Ultraviolet Biometer Temperature(inst_down_uvb_temp)
more
nsaskyrad60sC1.b1:
  • Internal voltage(internal_voltage)
  • PIR1 minimum(pir1_min)
  • NIP mean(nip_mean)
  • Downwelling shortwave hemispheric irradiance, pyranometer, maxima(down_short_hemisp_max)
  • IRT1 minimum(irt1_min)
  • NIP standard deviation(nip_sd)
  • IRT1 standard deviation(irt1_sd)
  • PIR1 unshaded maximum(pir1_max)
  • PSP shaded standard deviation(psps_sd)
  • IRT1 maximum(irt1_max)
  • Downwelling Shortwave Hemispheric Irradiance, Pyranometer, Minima(down_short_hemisp_min)
  • UVB minimum(uvb_min)
  • PSP shaded mean(psps_mean)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Minima(down_long_hemisp_shaded_min)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
  • UVB mean(uvb_mean)
  • Shortwave Direct Normal Irradiance, Pyrgeometer, Standard Deviation(short_direct_normal_std)
  • Downwelling Longwave Hemispheric Irradiance, Unshaded Pyrgeometer(down_long_hemisp_unshaded)
  • Downwelling Longwave Hemispheric Irradiance, Unshaded Pyrgeometer, Minima(down_long_hemisp_unshaded_min)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Pyranometer, Standard
    Deviation(down_short_diffuse_hemisp_std)
  • Downwelling Ultra-Violet Irradiance, UV Biometer, Maxima(down_uvb_max)
  • UVB standard deviation(uvb_sd)
  • Shortwave direct normal irradiance, pyrheliometer, minima(short_direct_normal_min)
  • UVB maximum(uvb_max)
  • Sky infrared temperature, standard deviation(sky_ir_temp_std)
  • Downwelling Longwave Hemispheric Irradiance, Unshaded Pyrgeometer, Maxima(down_long_hemisp_unshaded_max)
  • lon(lon)
  • Downwelling Ultra-Violet Irradiance, UV Biometer, Minima(down_uvb_min)
  • PIR shaded standard deviation(pirs_sd)
  • Downwelling longwave hemispheric irradiance, shaded pyrgeometer, standard
    deviation(down_long_hemisp_shaded_std)
  • Downwelling Ultra-Violet Irradiance, UV Biometer(down_uvb)
  • PIR1 mean(pir1_mean)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1, Maxima(down_long_hemisp_shaded1_max)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Pyrgeometer, Minima(down_short_diffuse_hemisp_min)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
  • PIR1 unshaded standard deviation(pir1_sd)
  • PIR shaded mean(pirs_mean)
  • PSP shaded maximum(psps_max)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1, Minima(down_long_hemisp_shaded1_min)
  • Downwelling Ultra-Violet Irradiance, UV Biometer, Standard Deviation(down_uvb_std)
  • Shortwave direct normal irradiance, pyrheliometer(short_direct_normal)
  • Downwelling shortwave diffuse hemispheric irradiance, pyranometer, maxima(down_short_diffuse_hemisp_max)
  • PSP1 mean(psp1_mean)
  • PIR shaded minimum(pirs_min)
  • Downwelling Longwave Hemispheric Irradiance, Unshaded Pyrgeometer, Standard
    Deviation(down_long_hemisp_unshaded_std)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer2(down_long_hemisp_shaded2)
  • Sky Infra Red Temperature Maxima(sky_ir_temp_max)
  • IRT1 mean(irt1_mean)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1(down_long_hemisp_shaded1)
  • Data Logger Temperature(logger_temp)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Maxima(down_long_hemisp_shaded_max)
  • Bit data. See details.(bit_data)
  • PIR shaded maximum(pirs_max)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer2, Standard
    Deviation(down_long_hemisp_shaded2_std)
  • Sky Infra-Red Temperature Minima(sky_ir_temp_min)
  • External voltage(external_voltage)
  • NIP maximum(nip_max)
  • Sky Infra-Red Temperature(sky_ir_temp)
  • PSP1 maximum(psp1_max)
  • North Latitude(lat)
  • Down-welling unshaded pyranometer voltage(down_short_hemisp)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer, Standard
    Deviation(down_short_hemisp_std)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1, Standard
    Deviation(down_long_hemisp_shaded1_std)
  • PSP1 unshaded minimum(psp1_min)
  • -180.0 - +180.0(alt)
  • Raw data filename(filename)
  • Downwelling longwave hemispheric irradiance, shaded pyrgeometer(down_long_hemisp_shaded)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer2, Minima(down_long_hemisp_shaded2_min)
  • base time in epoch(base_time)
  • PSP shaded minimum(psps_min)
  • NIP minimum(nip_min)
  • PSP1 unshaded standard deviation(psp1_sd)
  • Time offset from base_time(time_offset)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer2, Maxima(down_long_hemisp_shaded2_max)
more

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