PVC/NFOV/M1 - Minor instrument noise

When the signals are very low, a regular feature can be seen in the data. It begins on the 
hour, and lasts for ~20 minutes. This feature is a rise in the signal of about 0.25 to 
0.33 mV. It is small even when compared with the NFOV's typically small signals. 

Current belief is the noise results from the instrument's close proximity to several 
substantial electrical devices, e.g., air conditioners.  

The instrument is slated to be co-located with the MFRSR which, it is hoped, will resolve 
the introduced noise issue.  This relocation is not expected to occur until completion of 
the PVC deployment.

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• Raw counts from instrument before calibration, 673 nm(raw_counts_673nm)
• Calibrated zenith radiance, 870 nm(radiance_870nm)
• Calibrated zenith radiance, 673 nm(radiance_673nm)
• Raw counts from instrument before calibration, 870 nm(raw_counts_870nm)