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5.1.14.2 NE : Normalize Exposure
Before choosing Normalize Exposure, make sure the following steps are completed:
1. Clean both sides of the scan window.
2. Load clean, white calibration document over entire scan window.
3. Scanner and lamps must be power on for at least 10 minutes.
If you enter “NE” for “Normalize Exposure”, the prompt “BASE EXPOSURE TIME [3F00];”
will appear. Reply with <CR>. Next, the prompt “TARGET PIXEL VALUE [C0]:” will
appear. Again, reply with <CR>. You will then receive the message “Clearing Gain Memory”
followed by the prompt “Use Response Peaks ? [Y]”. Press <CR> to take the positive
response.
A response curve will briefly appear for each camera. These are provided for informational
purposes only. On the X-axis is the pixel number and on the Y-axis is the light response of the
pixel (pixel value). The scanner will then begin automatically calibrating all the cameras, one
by one. Messages will appear on the screen telling you which camera is being calibrated. The
number you see on the left hand side under the camera number is the exposure time which
starts with the number entered at the first prompt. The numbers on the right side are calculated
average pixel values. Exposure time decreases by 100 (hex) each time until the target pixel
value is reached.Pressing <CR> will abort this operation.