Measuring Apertures 6, 8 And 10 Mil - REA ScanCheck 3n User Manual

If an aperture is selected that is too big, the measurement light point will be wider than the
narrowest width of the narrow bars or spaces in the code. With this, testing will result in a poorer
evaluation for the "edge contrast" parameter and therefore also for the "modulation" parameter.
A smaller measuring aperture has no negative impact if the bar code is of good quality. If smaller
measuring apertures are used, any defects present here may have a more severe effect on the
"Defects" parameter.
Measuring aperture too big Measuring aperture = module width
If large codes, such as 100 % ITF-14 codes including the light field zones, are to be measured, this
can result in the width of the scanning beam from the REA ScanCheck 3n being insufficient in the
aperture settings 6, 8 or 10 mil.
In this case, such codes can only be measured with the large 20 mil measuring aperture.

5.4.1 Measuring apertures 6, 8 and 10 mil

The function of the aperture setting is selected in the set-up
menu. In all set-up menus, the input field currently active is
marked with an orange bar. This marking can be moved
over the screen with the arrow keys to the next input field.
The button sequence:
<Setup> button
-
Menu item "3 settings" and confirm with
-
<OK ENTER> or by pressing <3> directly.
Sub-menu "2 measuring apertures", press
-
<OK ENTER> or <2> directly.
Select the desired measuring aperture from the
-
aperture screen with the arrow control and confirm with
<OK ENTER>.
This marks the desired aperture.
The arrow keys are used to activate the <OK> field,
-
then press the <OK ENTER> button.
It is also possible to press the <Store> button to save
the new settings.
Alternatively, it is also possible to execute a quick change of the measuring aperture directly from
the start menu by pressing the <6> key.
Operating Manual
REA ScanCheck 3n
V 1.2.0 24/02/2020
Not recommended
Page 65 / 116
REA VERIFIER
Aperture <= 80 % of X
Maximum size for the
measuring aperture
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