Techkon SpectroPlate, Руководство пользователя

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2.2 Additional functions of the „Expert“-model
Dot transfer curve
For quality control of a printing plate the knowledge of the entire
dot transfer
for
the whole gradation range is of great importance. It has to be analyzed how the
different dot sizes and number of dots between 0 und 100 % are transferred geome-
trically on the printing plate. This transfer characteristic is drawn in a transfer curve.
The horizontal axis lists the reference values in % and the vertical axis the measured
dot percentage values. If the measurement values are on a 45° line, it means that it is
a linear 1:1 dot transfer.
In order to record a complete dot transfer curve, all measurement patches of a
gradation wedge have to be measured. A gradation wedge consists of consecutive
measurement patches e.g. 10 % , 20 %, 30 %, ...
Before we can start measuring, specific settings have to be made first:
First, the type of gradation wedge has to be
described.
In this case it consists of
2 %, 5 %, 10 %, 20 %... patches.
With the Arrow buttons we
can select the %-reference value and by
pressing the Enter button it will be put into
the right location within the list. Deleting a
reference button works accordingly: Selec-
ting with the Arrow buttons and removing
it by pressing the Enter button.
Optionally, target values and tolerance ranges
can be edited.
The memory has four sections
for target values.
This function will take a mea-
sured curve as target values.
Manual TECHKON SpectroPlate Chapter 2 - Measurement functions Page 20