CPI CMP 200 Series Service Manual page 227

CPI Canada Inc.
3D.6.0 AEC CALIBRATION (WALL BUCKY) Cont
Step
12. If the measured O.D. is not the desired value, adjust the gain pot to increase or decrease the density, then repeat the previous two
steps. Do not readjust the kV breakpoints that were previously calibrated.
13. Change the SID to 40 in. (100 cm) and repeat steps 10 to 12. Adjust the gain pot if necessary to achieve an acceptable
compromise between both SID's.
14. Verify the O.D. at a range of different kV's.
15. Press << as required to return to the GEN CONFIGURATION menu (membrane console).
Steps 16 to 21 apply only if using two receptor select buttons (one for each SID), using one previously calibrated film
screen and one uncalibrated film screen.
16. Select the wall Bucky image receptor via the selector configured for the 40 in. (100 cm) SID.
17. Repeat steps 1 to 12 at the 40 in. (100 cm) SID position using the appropriate previously calibrated film screen.
18. Verify the O.D. at a range of different kV's.
19. Select the wall Bucky image receptor via the selector configured for the 72 in. (180 cm) SID.
20. Calibrate the film screen assigned to this SID as per the table Bucky procedure. The AEC calibration pot must not be readjusted,
as it was calibrated at the 40 in. (100 cm) SID. All breakpoints, including the 75 kV breakpoint, are to be calibrated by adjusting the
calibration numbers ONLY.
21. Press << and EXIT as required to return to the GEN CONFIGURATION menu (membrane console).
3D.7.0 AEC CALIBRATION (MISC)
The remaining image receptors are calibrated in a similar manner to the table Bucky receptor. Only the gain pot for the active channel is to be
adjusted at the slowest film screen used on the selected receptor. DO NOT READJUST THE GAIN POT FOR PREVIOUSLY CALIBRATED
RECEPTORS, AND DO NOT READJUST THE CALIBRATION VALUES IN THE AEC CALIBRATION MENU FOR PREVIOUSLY
CALIBRATED FILM SCREENS.
THE MEMORY FUNCTION THAT WAS TEMPORARILY CHANGED TO OFF EARLIER IN THIS CHAPTER MAY NOW BE RESET TO THE
DESIRED VALUE.
Use and disclosure is subject to the restrictions on the title page of this CPI document.
®
CMP 200 Service Manual Ch # 901476-05 Rev. A
Action
3D
AEC Calibration
Page 3D-34