NSA/SKYRAD/C2 - Station noise problem

From 8/18 through 8/20 the logger battery voltage (vBatt) periodically jumps in voltage 
with noise on all differential measurements.  The qc fields caught most of the 
down_long_hemisp MAX failures but the bad short_direct_normal, down_short_hemisp and 
down_short_diffuse_hemisp values were not flagged.

Noise returned on 8/22, 8/25-26 and 8/27-28.

Site Ops checked and re-routed the Sky stand grounds on 8/21 and performed additional 
ground re-work on 8/28.  After that date, noise has not returned to the Skystand logger 
instruments.

Data is not recoverable during these time periods.

• inst_down_long_hemisp2_tp
• inst_sky_ir_signal
• inst_direct_normal
• inst_diffuse
• inst_down_long_hemisp1_case_resist
• inst_global
• inst_down_long_hemisp2_case_resist
• inst_down_long_hemisp2_dome_resist
• inst_down_long_hemisp1_tp
• inst_down_long_hemisp1_dome_resist

• down_short_hemisp_max
• short_direct_normal
• down_short_hemisp_std
• short_direct_normal_max
• short_direct_normal_std
• down_long_hemisp1_max
• down_long_hemisp1_std
• down_short_hemisp
• down_long_hemisp1
• down_long_hemisp2
• down_short_diffuse_hemisp_min
• sky_ir_temp
• inst_down_long_hemisp2_case_temp
• inst_down_long_hemisp2_tp
• down_long_hemisp2_std
• inst_down_long_hemisp1_dome_temp
• down_long_hemisp2_max
• down_short_diffuse_hemisp_std
• down_short_diffuse_hemisp_max
• sky_ir_temp_std
• sky_ir_temp_max
• vBatt
• down_long_hemisp2_min
• sky_ir_temp_min
• down_short_diffuse_hemisp
• down_short_hemisp_min
• short_direct_normal_min
• inst_down_long_hemisp2_dome_temp
• inst_down_long_hemisp1_tp
• down_long_hemisp1_min
• inst_down_long_hemisp1_case_temp