© REA Elektronik GmbH, Teichwiesenstraße 1 D-64367 Muehltal
REA VeriCube Operating Manual Version 2.16 – 11/2020
Page 54 of 119
Further testing criteria
Measurement
parameter
Unit
Tolerance
Reference
Symbol contrast
%
+/- 8
(calculated from
Rmax and
Rmin)
Measurement
values on the
stamped
reference test
report
Modulation
Grade
+/- 0
Module size
µm
+/- 5
Print growth
µm
+/- 10
9.2.2
Calibration for white light
Together with the calibration card only one reference report created by using red
light is supplied. This report is created at the end of the manufacturing process.
In case white light is used and white light shall also be calibrated, then the process
described in chapter 9.2.2 is used too. The reference is also in this case the report
created by using red light. This simplification is possible because black and white is
supposed to provide the same reflectance values under red and white light. To prove
that the method is working the performance has been checked by using calibrated
reflectance standards (barium sulfate) which provide reflectance value for the visible
light range from 400 to 700nm wavelength.
The following data must be examined in order to make sure that the correct symbol
with the settings for the test equipment monitoring has been used.
Further
measurement data and threshold values, which are shown, in addition, in
the test report in the context, shall be ignored for this testing.
Aperture
5
16 mil, 0.406 mm
Light type
4000°K - 45° from all four sides
Symbol
Passed 4.0
Symbology
Data Matrix ECC200
Code content
30Q324343430794<OQQ
The following table lists the criteria, which must be examined according to ISO/IEC
15426-2. Allowed tolerances for calibration with white light:
Measurement parameter
Unit
Tolerance
Reference
Rmax
6
(see the histogram)
%
+/- 5
Measurement
values on the
stamped
Rmin
7
(see the histogram)
%
+/- 3
UEC
8
%
+/- 0
5
Aperture – Synthetic aperture according to the definition of ISO/IEC 15415
6
Rmax – Maximum Reflectance according to ISO/IEC 15415
7
Rmin – Minimum Reflectance according to ISO/IEC 15415
8
UEC – Unused Error Correction – defined in ISO/IEC 15415
