Instrument Operation 5-35
Inverted Data vs. Raw Data
If Enable Logging is checked, size distribution data from each completed
sample will be logged to a .txt file. The size distribution is logged as
dN/dlogDp Concentration (#/cc) vs. size (nm). The file will be identical to
the row format export option in the Aerosol Instrument Manager software,
with the exception that the weighting and units in the inverted data file are
fixed while the weighting and units in the Aerosol Instrument Manager
software export file are selectable. In addition to the sample data, the
inverted data file contains all SMPS scan parameters including gas
parameters, corrections states, hardware configuration, and scheduling
configuration.
Figure 5-20
Sample Inverted Data Export File
If Enable Logging and Log Raw Data are both checked, a .TIM file
containing raw counts will be saved in addition to the .txt file. Raw data
from each completed scan will be logged to the .TIM file. The .TIM file
differs from the .txt file in that the size distribution is logged as CPC counts
vs. time (at the CPC sampling rate of 50 Hz) instead of concentration vs.
size, and raw data is saved on a per-scan basis instead of a per-sample
basis. The primary purpose of the .TIM file is for import into the Aerosol
Instrument Manager software, but it can be opened as a .txt file for other
purposes as well. Similar to the inverted data file, it also contains all SMPS
scan parameters.
C a u t i o n
When importing a .TIM file into Aerosol Instrument Manager software,
version 10.1 or higher should be used to ensure that the inversion
algorithm used by the software is identical to the inversion algorithm
used by the classifier.
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