MAG/UHSAS/M1 - 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 360 seconds fast.  This has been determined by comparing 
the time of spikes in UHSAS CPC data.  

Aside from jumps in the time the UHSAS seems to always be drifting faster compared to the 
CPC.  

For the period from 10/18/2012 9:41:45.70 until 10/27/2012 21:06:41.90 the UHSAS is fast 
approximately 30sec.

For the period from 11/06/2012 3:38:42.00 until 12/13/2012 9:35:36.30 the UHSAS is fast 
approximately 60 to 90 sec.

For the period from 05/11/2013 22:37:37.90 until 07/03/2013 8:50:02.80 the UHSAS is fast 
approximately 210 to 360 sec.

For the period from 07/07/2013 23:14:40.00 until 09/25/2013 20:42:48.70 the UHSAS is fast 
approximately 30 to 240 sec.

Documents attached to DQPR 4363 show the time of the peaks used to approximate the error 
in the time.

Average the data for a longer period.


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