Scanlab RTC 4 - Page 23

RTC
®
4 PC Interface Board
Rev. 1.3 e
4 Principle Of Operation
23
innovators for industry
Customizing The Variable Polygon Delay
The command load_varpolydelay(FileName, X)
loads a table for the scaling function scale(φ) from an
ASCII text file (with the filename extension
*.STB ).
Each STB file can contain one or more tables.
See load_varpolydelay (page 97) for details.
The table contains up to 50 data points (φ| scale(φ))
for various angles φ. The RTC
®
4 determines the
scaling function scale(φ) from this data by linear inter-
polation.
Tab l e F or ma t
Each table starts with the instruction
[VarPolyTableX]
where X must be replaced by a positive integer which
denotes the table number.
Each data point (φ| scale(φ)) is described by two
instructions:
AngleY=....
ScaleY=....
where Y must be replaced by an integer (1 ≤ Y ≤50)
which denotes the number of the data point.
The values for the angle φ (in degrees) and the scaling
factor must be specified as floating point numbers.
Use the period
(.) as the decimal point.
The allowed ranges are:
0° ≤φ ≤180° and 0 ≤scale(φ) ≤2.
Notes
• Each instruction must be in a separate line.
• Empty lines are ignored.
• All characters following a semicolon
(;) are
ignored until the end of the line, i.e. the
semicolon can be used for comments.
• The order of the data points in the table is of no
importance.
• The angle φ = 0° means that two successive
vectors are parallel and are marked in the same
direction.
If the table contains no explicit data for φ =0°,
the scaling factor scale(0°) = 0 is assumed.
• The angle φ = 180° means that two successive
vectors are marked in the opposite direction.
If the table contains no explicit data for φ= 180°,
the scaling factor scale(180°) is set to the largest
scaling factor found in the table.
Figure 11 shows a sample table and the corre-
sponding scaling function.
11
Sample table and resulting scaling function scale(φ).
The sample table contains four data points.
; sample
[VarPolyTable1]
Angle1=20
Scale1=0.1
Angle2=40
Scale2=0.7
Angle3=60
Scale3=1.0
Angle4=90
Scale4=1.2