RTC
®
5 PC Interface Board
Rev. 1.9 e
7 Basic Functions for Scan Head and Laser Control
125
innovators for industry
(9)
Differentiation between correction with or
without an F-Theta objective
The following applies:
Parameter = 10 * P
Obj
+ P
Typ
with
– P
Obj
= 0: Correction without F-Theta objective
P
Obj
= 1: Correction with F-Theta objective
– if correction with F-Theta objective:
P
Typ
= 0.0: without distortion data
P
Typ
= 1.0: with F-Theta’s F-stop progression
condition
P
Typ
= 2.0: with image height table
(10)
Indicator for the source of the correction file
The following applies:
Parameter = 1000 * P
Orig
+ P
Ver
with
– P
Orig
= 10000: Original file
(as originally calculated)
P
Orig
= 20000: converted from ctb file
P
Orig
= 30000: reconstructed from txt file
If a correction file is modified by the correXion5
software or by another correction program,
then P
Orig
will be incremented by 1 each time
– P
Ver
= Version number of the program used to
create the correction file
(11)
Information about inverse tables.
The following applies:
Parameter = P
Exist
+ 2 * P
Calc
with
– P
Exist
= 1.0: valid inverse table is present
P
Exist
= 0.0: no valid inverse table present
– if valid inverse table is present:
P
Calc
= 0: inverse table calculated ab initio
P
Calc
= 1: inverse table numerically calculated
(12)
Scan system’s angle calibration
Mechanical angle deflection in [± °] for 96% of
maximum deflection
(13)
Indicator for the scan head geometry used for
the calculation (for internal use only), e.g.:
– = –1.0: unknown geometry (e.g. for a table
converted from a ctb file)
– = 0.0: standard geometry
(14)
Indicator for whether an additional protective
glass was taken into account
The following applies:
Parameter = 1000000 * P
T
+ 1000 * P
I
with
– P
T
= protective glass thickness in mm (max. 2
decimal places)
– P
I
= refraction index (max. 3 decimal places)
Example: The value 3521450.0 corresponds to a
protective glass thickness of 3.52 mm and a
refraction index of 1.450.
(15)
Indicator for whether the image field size was
clipped in the correction file
– = 0.0: field size not clipped
– = 2.0: field size clipped
Notes
• A ct5 file created by converting another ctb file
will not contain all parameter data (see below).
The same applies to a 1to1 correction table.
• Parameters 3-7 are only relevant for 3D vector
commands and are set to 0 in 2D correction
tables.
• If the correct calibration factors are used (see
), then the same ABC coefficients
(parameters 5-7) can be used on the same 3-axis
scan system with RTC
®
4 boards (ctb files) and
RTC
®
5 boards (ct5 files).
Converting Correction Files
The delivered product includes the program
CorrectionFileConverter.exe
for converting RTC
®
4
correction files (ctb) into RTC
®
5 correction files (ct5)
and vice versa. Program usage is described in the
accompanying guide.
When converting a ctb file into a ct5 file, the latter’s
file header will receive an origin indicator (parameter
10, P
Orig
= 20000). Such conversions do
not
produce
fully complete RTC
®
5 correction files. After
conversion, the file header lacks a variety of param-
eters, which can be subsequently added via the
CorrectionFileConverter.exe
program. Moreover,
conversion of numerically calculated inverted
correction tables sometimes results in incomplete
scan field coverage or even no inverse correction
table at all (also see parameter 11,
In contrast, converting a ct5 file into a ctb file results
in a fully complete ctb correction file. The ctb file’s 2D
tables then won’t contain the parameters from the
ct5 file header, whereas the 3D tables will contain
only some of them.
