CPI Canada Inc.
AEC Calibration
3D
Millenia / Indico 100 Series Service Manual Ch # 740904-06 Rev. D
Page 3D-39
3D.9.0 MULTIPLE
SPOT
COMPENSATION
(Cont)
Step
Action
1.
Place 4.0 mm of copper (pure grade) in front of the collimator, ensuring that the radiation
is COMPLETELY blocked by the absorber.
2.
Select the slowest film screen combination to compensate. This will normally be FILM
SCREEN 1.
3.
Select >>.
4.
Select MULT SPOT COMP.
5.
Enter the value 0% using the + and - buttons.
6.
Select 85 kV via the kV + or - buttons in the radiography section of the console.
7.
Select mA appropriate to the film speed per table 3D-13.
8.
Load the test cassette with fresh film and install it in the SFD.
9.
Make an exposure and record the mAs, then develop the film.
10.
Verify that the film is evenly exposed, and that the O.D. is the desired value
11.
Enable the SFD multi-spot function, then make several exposures and record the mAs.
12.
Develop the film and record the O.D. for each exposure.
13.
If the measured optical densities are not within 5% of the desired value, enter a multi-
spot compensation offset percentage that increases or decreases the mAs as
appropriate using the + and - buttons.
14.
Repeat steps 8 to 13 until the desired O.D. is achieved on all exposures.
15.
Select << three times to return to the AEC CALIBRATION menu.
16.
Repeat steps 2 to 15 for FILM SCREEN 2 and FILM SCREEN 3 if required.
17.
Select EXIT to return to the GEN CONFIGURATION menu.
18.
Select EXIT SETUP to return to the normal operating mode.
