| Subject: | SGP/BRS/C1 - SW Direct Normal incorrect |
| DataStreams: | sgpbrs20sC1.a0, sgpbrsC1.b1
|
| Description: | Apparent lightning strike in the instrument cluster area resulted in a failed NIP. Data
are missing or incorrect.
The SIRS was due for calibration change outs so the US, DS, DD and NIP were replaced. The
updated program was loaded at approximately 06/14/2011 1739 GMT.
An estimate of direct normal values can be derived using the following formula:
short_direct_normal = (down_short_hemisp - down_short_diffuse_hemisp)/cos(zenith angle) |
| Measurements: | sgpbrsC1.b1: - Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
- Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
- short_direct_normal_std
- Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
sgpbrs20sC1.a0:
|
| Subject: | SGP/BRS/C1 - Tracker failure |
| DataStreams: | sgpbrs20sC1.a0, sgpbrsC1.b1
|
| Description: | Apparent lightning strike in the instrument cluster area resulted in a failed tracker.
Site ops found the suntracker at home position, power cycled the suntracker and replaced
fuse. |
| Measurements: | sgpbrsC1.b1: - down_short_diffuse_hemisp_std
- Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Maxima(down_short_diffuse_hemisp_max)
- Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Minima(down_short_diffuse_hemisp_min)
- Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
sgpbrs20sC1.a0:
|
| Subject: | SGP/BRS/C1 - Reprocess: Incorrect calibration coefficient for down_short_diffuse_hemisp |
| DataStreams: | sgpbrs20sC1.a0, sgpbrsC1.b1
|
| Description: | Applied calibration coefficient and serial number for down_short_diffuse was incorrect for
the specified period.
Perform the following calculation to correct the data,
DD= downwelling diffuse instrument:
Old Calibration coefficient = 114.74[W/m2\mV]
New Calibration Coefficient = 109.51[W/m2\mV]
DD(new)[W/m2]=( DD(old)[W/m2]/ 114.74 [W/m2\mV] )* 109.51 [W/m2/mV] |
| Measurements: | sgpbrsC1.b1: - down_short_diffuse_hemisp_std
- Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Maxima(down_short_diffuse_hemisp_max)
- Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Minima(down_short_diffuse_hemisp_min)
- Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
sgpbrs20sC1.a0:
|