Luna 4600 - Saving and Loading Data Files

62 Chapter 5
Data Processing and Display
5
When the upper graph X-axis displays length, the Group Index field shown below
appears in the lower right corner. The user may enter the index appropriate for the
device under test.
Saving and Loading Data Files
The OBR control software provides two options for saving data files. The first file
type (.obr) is a binary data format that completely captures the measured data and
stores it in a format that can be loaded back into the control software at a later time
for further manipulation. The user may also save a smaller portion of the measured
data, highlighted by one vertical cursor in the upper graph; these file names end in
“_Segment.obr.” Binary segments may also be reloaded into the OBR software.
The second file type is a text file in a tab-delimited spreadsheet format. Text files
contain the data displayed in the upper (_Upper.txt) or lower (_Lower.txt) graphs
at the time of saving. Data saved in the spreadsheet format cannot be loaded back
into the control software.
It is highly recommended that the binary data format be chosen over the spreadsheet
format for data archives. The binary format stores all measurement information,
whereas the spreadsheet format stores only a subset of the measured information.
Furthermore, a spreadsheet file can always be generated from a binary file at a later
date, but a binary file cannot be generated from a spreadsheet file. Finally, other
data analysis software packages available from Luna Technologies accept only the
binary data format produced by the OBR control software.
Saving Data
Depending on which options are set in the File > Select File Options dialog box
(Figure 5-3), up to four files may also be saved each time File > Save Data Files
is selected. As an example, if the user saves the data as Your_Filename, the four
files would be:
1 Your_Filename.obr is the complete binary file, which can be reloaded
into the OBR software.
2 Your_Filename_Segment.obr is a subset of the data displayed in the
upper graph. This subset is the region integrated by the vertical cursor
in the upper graph and displayed in the lower graph. These files may
also be reloaded into the OBR software.