HF Series Generators
Calibration
CA-1036R2
36
ION CHAMBERS WITHOUT DETECTOR GAIN SWITCHES
OR WITHOUT POTENTIOMETER
1. Set the following jumper on the AEC Control Board to position B: JP3 for
Board A3012--x1/x2/x5 or JP2 for Board A3012--x6/x7/x9.
2. Set to mid range, the following potentiometer on the AEC Control Board:
R10 for Board A3012--x1/x2/x5 or R22 for Board A3012--x6/x7/x9.
The density adjustment of ALL the Ion Chambers in the system are
affected by this potentiometer.
3. Set SID at the Focal Distance of the Grid installed in the Table Bucky
(usually 100 cm) or in the Vertical Bucky Stand (usually 150 cm).
4. Collimate the X-ray beam so that it completely covers all three fields but
does not extend beyond limits of the phantom.
5. Place Copper plates (or equivalent homogeneous phantom) in the
Collimator Filter Holder: 1.5 mm for SID of 100 cm, 1 mm for SID 150 cm.
(1 mm Copper
≃
10 cm Plexiglass or Water).
6. Enter in calibration mode and verify that AEC Calibration number in E04,
E09, E20 and E23 Memory Locations is 70. The useful range for AEC
calibration numbers is from 20 to 120. Exit from calibration mode.
7. Enter in calibration mode selecting a Workstation configured for the Ion
Chamber to be calibrated. Enter in user mode inside calibration mode by
pressing the “Go to User Mode” button.
8. Select on the Console:
G RAD Menu: 70 kV, 200 mA Large Focus (or the first mA station for
Large Focus if 200 mA station is set for Small Focus) and 1 second
back-up time.
G AEC Menu: “Central Area”,“Density 0” and “Medium
Film/Screen”.
Note .
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