User Manual

46
2921B EN 20031206
Establishing the reference values and verifying image quality
After installation of a new Drystar 5300 Imager and before initial use you must
establish Quality Control aim values. These values will be used as the base
line for comparison when daily Quality Control is done. These values should
be determined again after major service or repair.
The following Quality Control aim values must be determined:
• The daily operating density levels. Refer to ‘Establishing the daily operating
reference density levels’ on page 47.
• Drystar 5300 image geometry. Refer to ‘Establishing the image geometry
reference values’ on page 52.
Once Quality Control aim values are established you must evaluate the
Spatial Resolution and the Artifact Levels to determine if the image quality is
acceptable. Refer to
‘Establishing the image geometry reference values’ on
page 52.
The Quality Control aim values, the Spatial Resolution and Artifact levels and
the Image Geometry values are all recorded on the Quality Control charts.
Refer to Appendix B ‘Quality Control Charts’ on page 71.
On these charts, the following test conditions are also recorded:
• The type and serial number of the Drystar 5300 Imager,
• Type and emulsion number of the film used to determine the reference values,
• The type of densitometer used, e.g. internal (in printer) or external,
• If an external densitometer is used: the type and the serial number of the
densitometer,
• The time (day, month, year) that the values were established.
Before you can establish the daily operating levels, the Drystar 5300
Imager must be switched on for at least 15 minutes and it must be
calibrated as well. Refer to ‘Switching on the Drystar 5300’ on page 28
and ‘Film calibration’ on page 104 of the Drystar 5300 Reference manual.