TWP/VCEIL/C1 - Ceilometer clock drift

During this period the ceilometer was using a software version that
provided time stamps that were based on the ceilometer clock and
not the computer clock that was continually sychronized with GPS.
This lead to times that were erroneous by as much as 2 minutes. For
most applications 2 minutes is an acceptable error, but for some
applications this may be a problem.

User beware.

• North Latitude(lat)
• Flag indicating aeri retrieval status(status_flag)
• Sum of detected and normalized backscatter(sum_backscatter)
• Detection status.(detection_status)
• Percentage of nominal factory setting (0 to 999%)(laser_pulse_energy)
• Distance to the center of the corresponding range bin(range)
• Aerosol volume backscattering coefficient at 355 nm(backscatter)
• 6 character string describing instrument measurement parameters(measurement_parameters)
• Second lowest cloud base height(second_cbh)
• Lowest cloud base height detected(first_cbh)
• Third cloud base height(third_cbh)
• Millivolts at internal ADC input (0 to 2500)(background_light)
• lon(lon)
• Laser temperature(laser_temperature)
• Warning, alarm, and internal status information(status_string)
• Percentage of nominal factory setting (0 to 999%)(receiver_sensitivity)
• Time offset from base_time(time_offset)
• Window contamination(window_contamination)
• base time in epoch(base_time)
• Altitude of highest signal(alt_highest_signal)
• -180.0 - +180.0(alt)
• Degrees from vertical (-15 to +90)(tilt_angle)
• Raw data filename(filename)
• Vertical visibility(vertical_visibility)

• (Raw data stream - documentation not supported)

• -180.0 - +180.0(alt)
• 6 character string describing instrument measurement parameters(measurement_parameters)
• Third cloud base height(third_cbh)
• Detection status.(detection_status)
• Laser temperature(laser_temperature)
• Window contamination(window_contamination)
• Sum of detected and normalized backscatter(sum_backscatter)
• Warning, alarm, and internal status information(status_string)
• Percentage of nominal factory setting (0 to 999%)(laser_pulse_energy)
• Altitude of highest signal(alt_highest_signal)
• Aerosol volume backscattering coefficient at 355 nm(backscatter)
• Lowest cloud base height detected(first_cbh)
• North Latitude(lat)
• Flag indicating aeri retrieval status(status_flag)
• Second lowest cloud base height(second_cbh)
• Percentage of nominal factory setting (0 to 999%)(receiver_sensitivity)
• Raw data filename(filename)
• base time in epoch(base_time)
• Vertical visibility(vertical_visibility)
• Distance to the center of the corresponding range bin(range)
• lon(lon)
• Time offset from base_time(time_offset)
• Degrees from vertical (-15 to +90)(tilt_angle)
• Millivolts at internal ADC input (0 to 2500)(background_light)