Appendix D Calibration (Using Generator Service Tools)
HF Series X-ray Generators - Service Manual Revision W
Quantum Medical Imaging, LLC D-51
• If the generator 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 potentiometer A11R82 to
increase or decrease the mAs value.
• If the generator is equipped with "universal" type AEC (i.e., AEC
Board A11 is part number AY40-027S), and the ion chamber is
"slope" type (i.e., AID), adjust potentiometer A11R87 to increase
or decrease the mAs value.
10. Re-take exposure at the above settings. Repeat until the two mea-
sured values are within range.
11. Take an exposure at 110 kVp (100 kVp if calibrating a "level" type
(Siemens) ion chamber), 75S mA, 10 cm. Verify mAs value is within
±5% of previous measurements.
12. Take an exposure at 110 kVp (100 kVp if calibrating a "level" type
(Siemens) ion chamber), a mid-range mA value, 10 cm. Verify mAs
value is within ±5% of previous measurements.
CAUTION! If using a mAs meter, re-connect the
green/yellow wire marked "MAS METER" to the
ground stud on top of the H.V. Transformer (see
Figure D-21).
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