SGP/VCEIL/B5 - Degraded hardware

Following repair at Vaisala and re-installation on 10/23/2007, the ceilometer experiencing 
intermittent receiver alarms and discontinuities in the backscatter plot. Vaisala 
recommended the old firmware card be replaced but that did not resolve the problems. The 
instrument was replaced with a spare and returned to the vendor for repair.

• Degrees from vertical (0 to +90)(tilt_angle)
• Detection status. See details(detection_status)
• 6 character string describing instrument measurement parameters(measurement_parameters)
• Percentage of nominal factory setting (0 to 999%)(receiver_sensitivity)
• Vertical visibility(vertical_visibility)
• Flag indicating aeri retrieval status(status_flag)
• Aerosol backscatter coefficient at 355 nm(backscatter)
• Lowest cloud base height detected.(first_cbh)
• Laser temperature(laser_temperature)
• Percentage of nominal factory setting (0 to 999%)(laser_pulse_energy)
• Warning and alarm status bits(status_string)
• Third cloud base height(third_cbh)
• Second lowest cloud base height(second_cbh)
• Millivolts at internal ADC input (0 to 2500)(background_light)
• Backscatter sum(sum_backscatter)
• Millivolts at internal ADC input(window_contamination)
• Altitude of highest signal(alt_highest_signal)
• range(range)