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-19
3D.3.0 AEC CALIBRATION (TABLE BUCKY) Cont
Step Action
31.
Load the test cassette with fresh film and install it in the image receptor. Using the same technique, expose the film and develop it.
32.
Measure the optical density. The optical density should be as per step 18.
33.
If the measured O.D. is not the desired value, readjust the 55 kV calibration number, then repeat the previous two steps.
DO NOT READJUST THE AEC BOARD GAIN POT.
34.
Once the desired film density is achieved, record the required values in a copy of table 3D-9.
100 speed film screen
Break point
Absorber
mAs
Generator mA
Generator BUT mAs
75 kV knee pt.
20 cm H
2
O
16 mAs
320 mA
320 mAs (MAX)
55 kV
15 cm H
2
O
25 mAs
320 mA
320 mAs (MAX)
50 kV
15 cm H
2
O
40 mAs
320 mA
320 mAs (MAX)
65 kV
15 cm H
2
O
10 mAs
320 mA
320 mAs (MAX)
110 kV
25 cm H
2
O
6.3 mAs
200 mA
320 mAs (MAX)
130 kV
25 cm H
2
O
5 mAs
200 mA
320 mAs (MAX)
85 kV
20 cm H
2
O
10 mAs
320 mA
320 mAs (MAX)
95 kV
20 cm H
2
O
5 mAs
320 mA
320 mAs (MAX)
200 speed film screen
Break point
Absorber
mAs
Generator mA
Generator BUT mAs
75 kVp knee pt.
20 cm H
2
O
8 mAs
250 mA
250 mAs (MAX)
55 kVp
15 cm H
2
O
12.5 mAs
250 mA
250 mAs (MAX)
50 kVp
15 cm H
2
O
20 mAs
250 mA
250 mAs (MAX)
65 kVp
15 cm H
2
O
5 mAs
250 mA
250 mAs (MAX)
110 kVp
25 cm H
2
O
3.2 mAs
250 mA
250 mAs (MAX)
130 kVp
25 cm H
2
O
2.5 mAs
250 mA
250 mAs (MAX)
85 kVp
20 cm H
2
O
5 mAs
250 mA
250 mAs (MAX)
95 kVp
20 cm H
2
O
2.5 mAs
250 mA
250 mAs (MAX)
Table 3D-8: Target breakpoint calibration factors
