CPI Indico 100 Series Service And Installation Manual page 163

CPI Canada Inc.
3D.5.0 AEC CALIBRATION (TABLE BUCKY) Cont
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Millenia / Indico 100 Series Service Manual
Load the test cassette with fresh film and install it in the image receptor. Using the same
technique, expose the film and develop it.
Measure the optical density. The optical density should be as per step 22.
If the measured O.D. is not within 5% of the desired value, adjust the 55 kV calibration
number using the + or - buttons, then repeat the previous two steps.
DO NOT READJUST THE AEC BOARD GAIN POT.
Once the desired film density is achieved, record the required values in a copy of table
3D-14.
If special techniques are NOT used which require the 50 kV range, simply enter the 55
kV calibration number into the 50 kV breakpoint using the + and - buttons.
Note that at approximately 55 kV and under, the screen film sensitivity becomes too low
for practical AEC operation when used with a bucky.
If the 50 kV range IS used, the 50 kV breakpoint must be calibrated. To do this select the
50 kV breakpoint. The 50 kV step will use the same absorber as used for the 55 kV step.
Repeat steps 27 to 32 to calibrate the 50 kV breakpoint if desired, substituting 50 kV
where applicable in place of 55 kV.
Select the 65 kV breakpoint. Use copper thickness per table 3D-13 for the 65 kV
breakpoint.
Repeat steps 27 to 32 to calibrate the 65 kV breakpoint, substituting 65 kV where
applicable in place of 55 kV.
IN THE FOLLOWING STEPS, SELECT >> AND << AS REQUIRED TO NAVIGATE
BETWEEN THE TWO BREAKPOINT SCREENS (SCREEN 1 LISTS BREAKPOINTS
50 KV TO 95 KV, SCREEN 2 SHOWS BREAKPOINTS 110 AND 130 KV).
Select the 110 kV breakpoint. Use copper thickness per table 3D-13 for the 110 kV
breakpoint. Note that 200 mA is recommended for this step.
Repeat steps 27 to 32 to calibrate the 110 kV breakpoint, substituting 110 kV where
applicable in place of 55 kV.
If special high kV techniques are NOT used which require the 130 kV range, enter the
110 kV calibration number into the 130 kV breakpoint using the + and - buttons.
If the 130 kV range IS used, the 130 kV breakpoint must be calibrated. To do this select
the 130 kV breakpoint. Use copper thickness per table 3D-13 for the 130 kV breakpoint.
Use 200 mA for this breakpoint as per table 3D-13.
Repeat steps 27 to 32 to calibrate the 130 kV breakpoint if desired, substituting 130 kV
where applicable in place of 55 kV.
Select the 85 kV breakpoint. Use copper thickness per table 3D-13 for the 85 kV
breakpoint.
Repeat steps 27 to 32 to calibrate the 85 kV breakpoint, substituting 85 kV where
applicable in place of 55 kV.
Action
50 KV BREAKPOINT CALIBRATION:
65 KV BREAKPOINT CALIBRATION:
110 KV BREAKPOINT CALIBRATION:
130 KV BREAKPOINT CALIBRATION:
85 KV BREAKPOINT CALIBRATION:
Ch # 740904-06 Rev. D
3D
AEC Calibration
Page 3D-29