HF Series Generators
Calibration
CA-1036R2
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2.6.2 BALANCE ADJUSTMENT FOR THREE FIELD DETECTORS
Some Ion Chambers does not provide balance potentiometers for
Three Field Detectors. Continue calibration process in Section
2.6.3 “Optical Density Adjustment”.
1. Set the Master Gain potentiometer of the Ion Chambers to mid range
(refer to Ion Chamber documentation).
2. Set the following jumper on the AEC Control Board to position A: JP3 for
Board A3012--x1/x2/x5 or JP2 for Board A3012--x6/x7/x9.
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 range for AEC
calibration numbers are 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.
Note .
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