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APPENDIX
7.4.3 Spectrum data file
The spectrum data file is a file in which spectrum data relating to WinSPM I-V
characteristics, force curve, etc. are recorded.
■
Spectrum data file structure
The spec header is identical to the image header in the WinSPM image file and followed
by all of the X and Y axis data. The data size varies depending on the kind of spectrum
measurement and the number of measurement points.
0x0000
Spec Header
SPS measurement data
X Axis Data
0x17CA
EOF
Spectrum
Data
Y Axis Data
■
Spec header data structure
Same as image header in the SPM image file
■
Spec data structure
The actual spectrum data are recorded in the file section (beginning with 0x17CA) after
the spec header. Each measurement point (4 bytes) is floating-point.
■
Spectrum Data file size
Spectrum data consist of X and Y axis data and the number of bytes of the data is given
by:
Spectrum Data = Number of measurement points
×
4 bytes
×
2 (axes)
Therefore, if, for instance, the number of measurement points is 2,048, the amount of
data is 16,384 bytes. Since the number of bytes of spec header data is 6,090 bytes, the
overall size of the spectrum data file is given by
Spec Header (6,090 bytes) + Spec Data (16,384 bytes) = 22,474 bytes
7-50
TMPM5200-2
