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Procedure for Adjusting Camera Magnification:
The first four steps of this procedure -- as well as the required equipment, tools, and materials -
- are the same as for adjusting the focus of the camera.
NOTE: In practice, both the focus and magnification of a given camera should be set before
moving on to the next camera because of the need for precise placement of the Standard Test
Document. Since focus and magnification interact, it is necessary to go back and re-check
focus whenever the magnification is changed.
1. Open the top cover and remove the rollers and document plate.
2. Place the Standard Target Document upside down on top of the scan window. The center
line of the target (barbell shape) should be directly above the center of the camera being
tested.
3. Place the white background strip on top of the Standard Target Document.
4. Place the weight on top of the white background strip.
5. Enter the magnification software by pressing <M>.
6. Use the <C> command to select the appropriate camera.
7. Use the <T> command to set the take mode to "AUTO."
8. Check the result display by the software.
• If the message "Can't Find Two Good Bars" is displayed, try adjusting the threshold up or
down. If that is unsuccessful, check the placement of the target document. When
successful, a distance is reported, and you can go on to the next step.
• If a distance is reported, the check is successful, and you can go on to the next step.
9. The magnification software locks its focus on the two rows of parallel lines on the target
document. It reports the distance between the leftmost and rightmost lines seen by the
camera. Since the lines within each of the two rows are each 50 pixels apart, the distance
reported must be a multiple of 50 when the magnification is correct.