Appendix B Calibration (DiRex System)
Revision W HF Series X-ray Generators - Service Manual
B-44 Quantum Medical Imaging, LLC
8. Repeat above steps with UPPER RIGHT ion chamber detector selected
and UPPER LEFT and UPPER CENTER detectors covered with lead. The
measured mAs reading should be within 5% of the mAs reading noted in
the previous step. If not, adjust the UPPER RIGHT detector gain potenti-
ometer, re-take exposure and verify it is within tolerance. Repeat as nec-
essary.
9. Access the Generator Settings Screen and reset Backup MAS to original
setting noted previously.
NOTE: If the system is equipped with
"universal" type AEC (i.e., AEC Board
A11 is part number AY40-027S), and
the ion chamber is "level" type (i.e.,
Siemens), adjust the appropriate detec-
tor gain potentiometer on AY40-027S in
accordance with the table below:
Table B-6. Universal AEC Board A11 Detector Gain
Adjustment Potentiometers (Siemens Ion Chamber Only)
ION CHAMBER DETECTOR
AEC BOARD A11
(AY40-027S)
POTENTIOMETER
TABLE 1 R61
TABLE 2 R63
TABLE 3 R66
WALL#1 1 R54
WALL#1 2 R55
WALL#1 3 R56
WALL#2 1 R53
WALL#2 2 R58
WALL#2 3 R57
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