Data Quality Reports for Session: 111140 User: sloehrer Completed: 03/19/2008

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D040421.3NSA/SKYRAD/C1 - itermittant IRT biasnsaskyrad60sC1.b1
D051101.2NSA/SKYRAD/C1 - IRT failurensaskyrad60sC1.b1
D060209.5NSA/SKYRAD/C1 - Power outage affecting some SKYRAD instrumentsnsaskyrad20sC1.a0, nsaskyrad60sC1.b1, nsaskyradC1.00
D080222.3NSA/SKYRAD/C1 - IRT mirror heater failurensaskyrad20sC1.a0, nsaskyrad60sC1.b1


DQRID : D040421.3
Start DateStart TimeEnd DateEnd Time
03/28/2003020006/21/20060215
Subject:
NSA/SKYRAD/C1 - itermittant IRT bias
DataStreams:nsaskyrad60sC1.b1
Description:
A problem with the SKYRAD IRT that itermittantly produced a gradual increase in the sky 
temperature measurement then a sudden correction, as compared to AERI, appears to have been 
caused by a combination of a failing IR detector, a poor signal cable, a contaminated 
(with condensation or frost) mirror or lens, and low ambient temperatures. The positive 
bias was apparently not consistant in either frequency or duration but on days when the 
unusual behavior is observed, it usually occurred from about 00:00 to 06:00 local time. 

The instrument was repaired and recalibrated and the signal cable replaced.
Measurements:nsaskyrad60sC1.b1:
  • Sky Infra Red Temperature Minima(sky_ir_temp_min)
  • Sky Infra Red Temperature Maxima(sky_ir_temp_max)
  • Standard Deviation of Sky Infra Red Temperature(sky_ir_temp_std)
  • Sky Infra-Red Temperature(sky_ir_temp)

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DQRID : D051101.2
Start DateStart TimeEnd DateEnd Time
10/31/2005060001/18/20060032
Subject:
NSA/SKYRAD/C1 - IRT failure
DataStreams:nsaskyrad60sC1.b1
Description:
The IRT failed and was replaced with a spare.
Measurements:nsaskyrad60sC1.b1:
  • Sky Infra Red Temperature Minima(sky_ir_temp_min)
  • Sky Infra Red Temperature Maxima(sky_ir_temp_max)
  • Standard Deviation of Sky Infra Red Temperature(sky_ir_temp_std)
  • Sky Infra-Red Temperature(sky_ir_temp)

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DQRID : D060209.5
Start DateStart TimeEnd DateEnd Time
02/07/2006091002/07/20062350
Subject:
NSA/SKYRAD/C1 - Power outage affecting some SKYRAD instruments
DataStreams:nsaskyrad20sC1.a0, nsaskyrad60sC1.b1, nsaskyradC1.00
Description:
During the power outage the downwelling global measurement from the PSP instrument and 
downwelling diffuse 8-48 instrument shows a slight increase from -5 to +0 W/m2.  This is due 
to removal of thermal offsets induced by the AC heater during the power outage.  This 
heater is installed within the PSP ventilator - it is necessary for the NSA/C1 climate.
The downwelling longwave PIR instrument is unaffected due to case and dome temperature 
corrections.
The IRT is AC powered and was not operational during this time period.
Measurements:nsaskyradC1.00:
  • Raw data stream - documentation not supported(Raw data stream - documentation not supported)
nsaskyrad60sC1.b1:
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
    Minima(down_short_diffuse_hemisp_min)
  • Down-welling unshaded pyranometer voltage(down_short_hemisp)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Maxima(down_short_hemisp_max)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Standard
    Deviation(down_short_hemisp_std)
  • Sky Infra-Red Temperature(sky_ir_temp)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
    Maxima(down_short_diffuse_hemisp_max)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Minima(down_short_hemisp_min)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
  • Downwelling Shortwave Hemispheric Irradiance, Pyranometer, Standard Deviation(down_short_diffuse_hemisp_std)
nsaskyrad20sC1.a0:
  • Instantaneous Downwelling Hemispheric Shortwave, Unshaded Pyranometer Thermopile
    Voltage(inst_global)
  • Instantaneous Sky/Cloud Infrared(inst_sky_ir_signal)
  • Instantaneous Uncorrected Downwelling Shortwave Diffuse, Shaded Pyranometer
    Thermopile Voltage(inst_diffuse)

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DQRID : D080222.3
Start DateStart TimeEnd DateEnd Time
12/16/2007000002/11/20081135
Subject:
NSA/SKYRAD/C1 - IRT mirror heater failure
DataStreams:nsaskyrad20sC1.a0, nsaskyrad60sC1.b1
Description:
The heater of the IRT gold mirror failed due to a broken wire (that probably occurred on 
12/13 during maintenance of the solar tracker) allowing snow and frost to accumulate on 
the mirror until it was cleared during daily preventative maintenance. The problem was 
corrected when the heater wires were replaced.
Measurements:nsaskyrad60sC1.b1:
  • Sky Infra Red Temperature Minima(sky_ir_temp_min)
  • Sky Infra Red Temperature Maxima(sky_ir_temp_max)
  • Standard Deviation of Sky Infra Red Temperature(sky_ir_temp_std)
  • Sky Infra-Red Temperature(sky_ir_temp)
nsaskyrad20sC1.a0:
  • Instantaneous Sky/Cloud Infrared(inst_sky_ir_signal)

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