Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
08/01/2007 | 0000 | 07/01/2008 | 1500 | Suspect |
Subject: | SGP/SIRS/E21 - Ventilator Fan Failure |
DataStreams: | sgpsirsE21.00, sgpsirsE21.b1, sgpsirs20sE21.a0 |
Description: | Start time is uncertain due to length of time this problem existed. During the time frame specified the PSP (down_short_hemisp) and 8-48 (down_short_diffuse_hemisp) ventilator fans failed. PM replaced the fans 7/1/2008 1500. Ventilator failure does adversely affect thermopile radiometer measurements but the extent has not been quantified. The 8-48 is significantly less affected than the PSP. 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 and down_short_diffuse_hemisp with discretion or apply component sum method to generate down_short_hemisp using down_short_diffuse_hemisp and short_direct_normal since down_short_diffuse_hemisp is less affected by this failure mode. |
Measurements: | sgpsirs20sE21.a0: more
sgpsirsE21.00: more sgpsirsE21.b1: more |