DQRID : D080626.1
Start DateStart TimeEnd DateEnd Time
06/18/2008000006/30/20082110
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Subject:
SGP/SIRS/E18 - Ventilator Fan Failure
DataStreams:sgpsirsE18.00, sgpsirs20sE18.a0, sgpsirsE18.b1
Description:
At the start time specified the PSP (down_short_hemisp) ventilator fan failed. PM replaced 
the fan 6/30/2008 2110.  Ventilator failure does adversely affect radiometer 
measurements but the extent has not been quantified.  Mentor suggests using component sum method 
detailed in SIRS instrument handbook where down_short_hemisp = down_short_diffuse + 
short_direct_normal * cos (zenith angle) for each time record.
Suggestions: 
Use down_short_hemisp with discretion or apply component sum method.
Measurements:sgpsirs20sE18.a0:
  • Instantaneous Downwelling Hemispheric Shortwave, Pyranometer Thermopile Voltage(inst_global)
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sgpsirsE18.b1:
  • Down-welling unshaded pyranometer voltage(down_short_hemisp)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer, Standard
    Deviation(down_short_hemisp_std)
  • Downwelling shortwave hemispheric irradiance, pyranometer, maxima(down_short_hemisp_max)
  • Downwelling Shortwave Hemispheric Irradiance, Pyranometer, Minima(down_short_hemisp_min)
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sgpsirsE18.00:
  • (Raw data stream - documentation not supported)
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