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CPI Canada Inc.
AEC Calibration
3D
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
Page 3D-18
3D.3.0 AEC CALIBRATION (TABLE BUCKY) Cont
For each breakpoint in the remainder of this section, start with the approximate mAs as per table 3D-8. After that mAs is achieved, a film
must be exposed and the O.D. verified. If the O.D. is not the desired value, further iterations may be required to achieve the desired optical
density.
DO NOT READJUST THE AEC BOARD GAIN POT AFTER THE 75KV BREAKPOINT IS CALIBRATED.
FURTHER DENSITY
ADJUSTMENTS WILL ONLY BE MADE BY ADJUSTING THE CALIBRATION VALUES FOR THE OTHER KV BREAKPOINTS.
Step
Action
26.
Change the absorber thickness as specified for the 55 kV breakpoint in table 3D-8. As before, ensure that the absorber fully blocks
the X-ray field.
Step
Action (membrane console)
Action (PC GenWare
®
)
Action (Touchscreen GenWare
®
)
27.
In the following steps, you will need to
scroll back and forth between
AEC CAL
menu 1 and
AEC CAL
menu 2 using the
>>
and
<<
buttons in order to access the
required breakpoints.
28.
Select the
55KV
breakpoint.
Click in the
55 kV
dialog box, under
Film
Screen Cal.
This will set the generator kV
demand to 55 kV.
Touch the 55 kV up or down buttons
under
Film Screen Calibration
. This will
set the generator kV demand to 55 kV.
29.
Make an exposure and note the mAs. Use
mA values as specified for the 55 kV
breakpoint in table 3D-8.
Make an exposure and note the mAs. Use
mA values as specified for the 55 kV
breakpoint in table 3D-8.
Make an exposure and note the mAs.
Use mA values as specified for the 55 kV
breakpoint in table 3D-8.
30.
Adjust the 55 kV calibration number using
the
+
or
-
buttons such that the actual mAs
is equal to the target mAs at 55 kV as per
table 3D-8.
DO NOT READJUST THE AEC BOARD
GAIN POT.
Adjust the 55 kV calibration number such
that the actual mAs is equal to the target
mAs at 55 kV as per table 3D-8.
DO NOT READJUST THE AEC BOARD
GAIN POT.
Adjust the 55 kV calibration number such
that the actual mAs is equal to the target
mAs at 55 kV as per table 3D-8.
DO NOT READJUST THE AEC BOARD
GAIN POT.