AGFA Drystar 4500 Reference Manual page 145

Performing the Annual QC tests
Geometric Consistency Test
To be able to notice fluctuations in image size and aspect ratio, you must
perform this procedure once a year.
First, perform the daily test.
1
Measure the distances A and B of the geometric square on the QC test image.
2
Refer to 'Establishing the image geometry reference values'
Make sure to measure distance A from the left edge of the left line to the
right edge of the right line and distance B from the upper edge of the
upper line to the lower edge of the lower line.
We strongly recommend using a 30 cm (12 inch) machinist scale with
0.5 mm divisions (1/64 inch).
Record these values as measured distances A and B on Chart 4 ('Drystar 4500
3
Geometric Consistency Control Chart').
Compare the measured A and B dimensions with the reference dimension
4
values, A and B
ref
Consistency Control Chart').
The differences between the measured dimensions of A and B and the reference
values A and B
ref
Check for image distortion.
5
Calculate the aspect ratio by dividing A by B.
6
The result must be 1 +/- 0.01
If the image size or distortion values exceeds the limits, contact Agfa
service to resolve the problem.
2800E EN 20050215
on the Drystar 4500 Chart 4 ('Drystar 4500 Geometric
ref
should be less than or equal to 1.0%.
ref
D 4500 R
RYSTAR EFERENCE MANUAL
on page 139.
Advanced operation (key-operator mode)
145