CPI Canada Inc.
AEC Calibration
3D
Millenia / Indico 100 Series Service Manual Ch # 740904-06 Rev. D
Page 3D-31
3D.6.0 SHORT AEC TIME COMPENSATION (IF APPLICABLE) Cont
Step
Action
7.
Reduce the absorber thickness again such as to decrease the AEC exposure time to
approximately 6 ms (but not less).
8.
Adjust the short AEC time compensation pot for the AEC channel being calibrated such
that the dose (or mAs) is approximately the same as it was in step 6.
9.
The short AEC time compensation adjustments affect the AEC calibration at longer
exposure times. Therefore, it may now be necessary to readjust the gain pot for the AEC
channel being calibrated to restore the dose (or mAs) values to the values previously
recorded in table 3D-14. Ensure that the absorber thickness and mA values are as per
table 3D-13 when readjusting the AEC gain pot.
10.
Films should be exposed and developed, and the O.D. checked at the 75 kV breakpoint
at AEC exposure times of approximately 6 ms and approximately 100 ms. If the film
density is not acceptable at both short and long AEC exposure times, it will be necessary
to iterate the adjustments of both the short AEC time compensation pot and the AEC
gain pot by repeating steps 3 to 8.
11.
Repeat steps 1 to 10 for each image receptor (AEC channel) to be short AEC time
compensated.
3D.7.0 AEC DENSITY CALIBRATION
The following screens are used for density calibration
* AEC CALIBRATION *
FILM SCREEN 1
DENSITY SETUP
FILM SCREEN 2
FILM SCREEN 3
EXIT
*TUBE? 0%HU *DENS. SE TUP*
-8: -
-7: -
-6: -
+
-5: 62%
-
3200MS EXIT >>
*TUBE? 0%HU *DENS. SETUP*
-4: 50%
-3: 37%
-2: 25%
+
-1: 12%
-
3200MS << >>
