DQRID : D080211.2
Start DateStart TimeEnd DateEnd Time
01/31/2008000002/08/20080248
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Subject:
TWP/SKYRAD/C1 - Failed PSP ventilator fan
DataStreams:twpskyrad60sC1.b1, twpskyrad20sC1.a0
Description:
On 1/31 the ventilator for the PSP measuring downwelling_shortwave_hemispheric irradiance 
failed.  The DQ effect of this failure on the measurement of down_short_hemisp is not 
possible to fully quantify but it has been noted that during these failures the PSP 
nighttime values can be several (1-3W/m2) smaller than usual.  Another effect is slower thermal 
response (1hr) of the PSP instrument due to daytime heating and cooling of the ventilator 
housing.
Suggestions: 
Use data with caution.
Measurements:twpskyrad60sC1.b1:
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer, Standard
    Deviation(down_short_hemisp_std)
  • Downwelling Shortwave Hemispheric Irradiance, Pyranometer, Minima(down_short_hemisp_min)
  • Down-welling unshaded pyranometer voltage(down_short_hemisp)
  • Downwelling shortwave hemispheric irradiance, pyranometer, maxima(down_short_hemisp_max)
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twpskyrad20sC1.a0:
  • Instantaneous Downwelling Hemispheric Shortwave, Pyranometer Thermopile Voltage(inst_global)
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