D Q R Report

Start Date	Start Time	End Date	End Time	Data Quality Metric
05/13/2005	1100	05/13/2005	2000	Suspect
05/28/2005	1730	05/29/2005	1800	Suspect
05/19/2005	0830	05/24/2005	1800	Suspect
05/31/2005	1500	06/04/2005	0900	Suspect
06/10/2005	0300	06/10/2005	0400	Suspect

Both PIRs reported unreasonable high readings with coincident low reading from the IRT. Since both PIR instruments exhibited exactly the same behaviour and the IRT an opposite response during large suspect data excursions this indicates that the false signal maybe the result of poor grounding. The PIR1,2 data and the IRT data are most adversely affected. During the problem periods PIR irradiance increased (typ pos 200-300W/m2) while the IRT response was negative (typ neg 20-30W/m2) but followed the response of the PIR. The Skyrad shortwave instruments were also affected but to much less extent (within their uncertainties). Data quality flags are typically not triggered during these problem periods. Data logger grounding was improved on 6/10 2005. The problem hasn't re-occurred since that time.

Subject:	NSA/SKYRAD/C1 - Datalogger grounding problem
DataStreams:	nsaskyrad20sC1.a1, nsaskyrad60sC1.b1, nsaskyrad20sC1.a0, nsaskyradC1.00
Description:	Both PIRs reported unreasonable high readings with coincident low reading from the IRT. Since both PIR instruments exhibited exactly the same behaviour and the IRT an opposite response during large suspect data excursions this indicates that the false signal maybe the result of poor grounding. The PIR1,2 data and the IRT data are most adversely affected. During the problem periods PIR irradiance increased (typ pos 200-300W/m2) while the IRT response was negative (typ neg 20-30W/m2) but followed the response of the PIR. The Skyrad shortwave instruments were also affected but to much less extent (within their uncertainties). Data quality flags are typically not triggered during these problem periods. Data logger grounding was improved on 6/10 2005. The problem hasn't re-occurred since that time.
Suggestions:	During time ranges noted instrument data from the Skyrad datalogger is suspect. Disregard this data or review before use.
Measurements:	nsaskyradC1.00: Raw data stream - documentation not supported more nsaskyrad20sC1.a0: inst_global lon inst_down_long_hemisp_shaded2_tp inst_down_long_shaded2_case_resist inst_down_long_shaded1_case_resist alt lat inst_diffuse base_time time_offset inst_sky_ir_signal time inst_direct_normal inst_down_long_hemisp_shaded1_tp inst_down_long_shaded2_dome_resist inst_down_long_shaded1_dome_resist more nsaskyrad20sC1.a1: inst_down_uvb_irradiance base_time inst_down_long_shaded_case_resist pir2_dome_therm inst_down_long_unshaded_dome_resist pir1_case_therm inst_down_long_hemisp_shaded2_tp inst_down_long_shaded_dome_resist time_offset filename uvb_temp pir2_case_therm inst_down_long_unshaded_case_resist inst_down_long_shaded2_dome_resist inst_down_long_shaded1_dome_resist pir1_dome_therm pir1_uncorr_irradiance inst_down_long_hemisp_shaded1_tp pir2_uncorr_irradiance lat inst_down_long_hemisp_shaded_tp inst_down_long_hemisp_unshaded_tp alt uvb_uncorr_irradiance lon inst_down_long_shaded2_case_resist inst_down_long_shaded1_case_resist inst_down_uvb_temp more nsaskyrad60sC1.b1: internal_voltage pir1_min nip_mean down_short_hemisp_max irt1_min nip_sd irt1_sd pir1_max psps_sd irt1_max down_short_hemisp_min uvb_min psps_mean down_long_hemisp_shaded_min down_short_diffuse_hemisp uvb_mean short_direct_normal_std down_long_hemisp_unshaded down_long_hemisp_unshaded_min down_short_diffuse_hemisp_std down_uvb_max uvb_sd short_direct_normal_min uvb_max sky_ir_temp_std down_long_hemisp_unshaded_max lon down_uvb_min pirs_sd down_long_hemisp_shaded_std down_uvb pir1_mean down_long_hemisp_shaded1_max down_short_diffuse_hemisp_min short_direct_normal_max pir1_sd pirs_mean psps_max down_long_hemisp_shaded1_min down_uvb_std short_direct_normal down_short_diffuse_hemisp_max psp1_mean pirs_min down_long_hemisp_unshaded_std down_long_hemisp_shaded2 sky_ir_temp_max irt1_mean down_long_hemisp_shaded1 logger_temp down_long_hemisp_shaded_max bit_data pirs_max down_long_hemisp_shaded2_std sky_ir_temp_min external_voltage nip_max sky_ir_temp psp1_max lat down_short_hemisp down_short_hemisp_std down_long_hemisp_shaded1_std psp1_min alt filename down_long_hemisp_shaded down_long_hemisp_shaded2_min base_time psps_min nip_min psp1_sd time_offset down_long_hemisp_shaded2_max more