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.

• Percentage of nominal factory setting (0 to 999%)(laser_pulse_energy)
• Distance to the center of the corresponding range bin(range)
• Second lowest cloud base height(second_cbh)
• Warning, alarm, and internal status information(status_string)
• Third cloud base height(third_cbh)
• Percentage of nominal factory setting (0 to 999%)(receiver_sensitivity)
• Aerosol volume backscattering coefficient at 355 nm(backscatter)
• Laser temperature(laser_temperature)
• Degrees from vertical (-15 to +90)(tilt_angle)
• Detection status.(detection_status)
• Flag indicating aeri retrieval status(status_flag)
• 6 character string describing instrument measurement parameters(measurement_parameters)
• Altitude of highest signal(alt_highest_signal)
• Millivolts at internal ADC input (0 to 2500)(background_light)
• Vertical visibility(vertical_visibility)
• Sum of detected and normalized backscatter(sum_backscatter)
• Window contamination(window_contamination)
• Lowest cloud base height detected(first_cbh)