User`s guide

16 User’s Guide
About Data File Structure
A data file is created on the designated drive whenever you
acquire a sample, or when you save a data file using the Save
As 32-bit… command. The file contains the following
information:
File Information Header. This contains information such as
the date and time of acquisition.
Complete method parameters used to acquire and process
the data (this is the "original" method saved only when the
data is acquired). Because you can acquire multiple channels
of data simultaneously on a given chromatograph, the method
section may contain complete parameters for more than one
channel.
Raw data points for the run saved. Multiple chromatograms
may be present in a single data file, each of which represents
a detector channel acquired for the run. The raw data points
are saved in binary format.
Results. The original integration results are saved in the file
and can be recalled later when the file is opened. In addition,
the most recent analysis results and method are also saved in
the data file and updated whenever you analyze. The Sample
ID for the results is also saved, as are manual integration
fixes.
File Description. If you entered a description for the file, this
text information is stored with the file, and can be viewed
under the Data File Properties or from the Open Data File
dialog.
Instrument Configuration. The configuration of the
instrument used to acquire the data file is saved.
Data File Audit Trail. An audit trail log is always saved in
the data file that tracks analysis of the data.
Data files are saved using the file name and extension you
specify when you initiate the data acquisition. The limit on
file name length is 255 characters, including path.
Data File Checksum. If Extended Security is enabled, a
checksum is calculated for the entire file whenever the data
file is closed. When the file is opened, its checksum is verified