PGH/NFOV/M1 - Instrument noise/interference

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 0.25 to 0.33 
mV.  It is small even when compared with the NFOV's typically small signals.  

My initial hunch is the NFOV is located next to or nearby equipment that 
operates/broadcasts/etc beginning on the hour, and lasting for ~20 minutes.

Looking (very closely) back at the previous deployment, this regular signal bump is also 
evident, so it seems the equipment contaminating the NFOV is part of the AMF1, and not 
unique to this deployment.  20111222 is a good example of the issue.

• raw_counts_673nm
• raw_counts_870nm
• Calibrated Zenith Radiance, 673nm(radiance_673nm)
• Calibrated Zenith Radiance, 870nm(radiance_870nm)

PGH/MET/M1 - Site installation

Site installation during this time. Data not reliable.

• precip_rate_max
• logger_voltage
• wind_spd_arith_sd
• Wind speed, lower, 1-min avg(wind_spd_arith_avg)
• wind_dir_sd
• pwd_cumul_snow
• pwd_pw_code_1_hr
• wind_spd_arith_min
• pwd_cumul_water
• logger_temp
• pwd_err_code
• Vapor pressure mean(vappress_mean)
• Average 10 min visibility(pwd_avg_vis_10_min)
• pwd_pw_code_15_min
• Average 1 min visibility(pwd_avg_vis_1_min)
• vappress_sd
• org_carrier_mean
• pwd_id
• precip_rate_min
• Rain, surface, 1-min avg(precip_rate_mean)
• relh_sd
• pwd_pw_code_inst
• Vector-averaged Wind Speed(wind_spd_vec_avg)
• temp_sd
• precip_rate_sd
• wind_spd_arith_max
• Mean Air Temperature or Hardware Error(temp_mean)
• Vector-averaged Wind Direction(wind_dir_vec_avg)
• pwd_avg_H2O_int_1_min
• Barometric Pressure(atmos_pressure)
• Relative humidity mean(relh_mean)

PGH/MET/M1 - Incorrect atmospheric pressure data

Logger was reprogrammed following revised installation. An error with the timing sequence 
for the barometer caused incorrect readings until the program was reverted on 7/6.

• Barometric Pressure(atmos_pressure)

PGH/MET/M1 - PWD spikes and missing data prior to revised install

The PWD was not installed efficiently, leading to occasional spikes and a period of 
missing data from 7/6 - 7/12 until revised installation took place and the programming was 
updated.

• pwd_err_code
• Average 10 min visibility(pwd_avg_vis_10_min)
• pwd_pw_code_15_min
• pwd_avg_H2O_int_1_min
• Average 1 min visibility(pwd_avg_vis_1_min)
• pwd_cumul_snow
• pwd_pw_code_1_hr
• pwd_pw_code_inst
• pwd_id
• pwd_cumul_water