HF Series Generators
Calibration
CA-1036R2
38
16. Take the maximum and minimum value of the O. Densities measured
before, sum them and divide the result by two. Subtract this value from
density 1.0 (or the customer preference O. Density) to obtain the O.
Density difference.
O.D. difference = O.D. customer preference --
O.D. max + O.D. min
2
Calculate the new O. Density by adding the O. D. difference (with its sign
+ o r --) to the value of the O. Density measured for the Ion Chamber closer
to 1.0 (or the customer preference O. Density).
new O.D. = O.D. mesured + (O.D. difference)
For this Ion Chamber, adjust the potentiometer (turning it clockwise will
decrease the O. Density) R10 for Board A3012--x1/x2/x5 or R22 for
Board A3012--x6/x7/x9 (at least one turn).
Enter in calibration mode selecting a Workstation configured for the Ion
Chamber to be calibrated. Enter in user mode inside calibration mode by
pressing the “Go to User Mode” button. Make another exposure, develop
the film and check the Optical Density. Repeat this action (adjusting the
potentiometer and making exposures) until the new Optical Density
(calculated before) for this Ion Chamber is obtained.
17. The Optical Density for each Ion Chamber has to be adjusted to 1.0 (or
the customer preference O. Density).
Exit from the “Go to User Mode” screen by pressing the “Manual
Calibration” button and in calibration mode select the AEC calibration
number for the respective Memory Location (E04, E09, E20 or E23).
Change the AEC calibration number: The Optical Density increases /
decreases when the calibration number is increased / decreased. Then
enter in “Go to User Mode” screen.
Make another exposure, develop the film and check the Optical Density.
Repeat this action (changing the respective Memory Location and
making exposures) until the desired Optical Density is obtained.
The AEC accuracy is better in all the useful range as the AEC
calibration number is closer to 70.
18. Repeat step-17. until the desired Optical Density for each Ion Chamber
is obtained.
19. Exit from the “Go to User Mode” screen by pressing the “Manual
Calibration” button and exit from calibration mode.
20. Record all the values for the Memory Locations in the Data Book.
Note .
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