PVC/UHSAS/S1 - Problem with time fields

During the deployment the instrument time for the UHSAS was not automatically synched and 
tended to drift fast relative to the time corrected by a time server. The time of the 
data in the files is about 20 to 220 seconds fast. This has been determined by comparing the 
time of spikes in UHSAS CPC data. 

The  Documents show the time of the peaks used to approximate the 
error in the time. About 2 peaks a week were chosen to compare.

Use the data after averaging over longer periods.	
		

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• Purge flow(purge_flow)
• Lower particle size limit for each bin(lower_size_limit)
• Temperature used for calculation(temperature)
• base time in epoch(base_time)
• Scatter signal(scattering_voltage)
• Auxiliary measurement, not implemented(auxiliary)
• Bin number(bin_num)
• Upper particle size limit for each bin(upper_size_limit)
• Reference(reference)
• Main flow rate(flow)
• Current(current)
• Particle size distribution(size_distribution)
• Sheath flow(sheath_flow)
• time_in_seconds_since_volume_start(time)
• Sample volume(sampling_volume)
• Differential_voltage, see instrument manual(differential_voltage)
• Sample pressure(sample_pressure)
• Time offset from base_time(time_offset)
• Unit temperature(unit_temperature)