Chapter 3 Calibration
Revision W HF Series X-ray Generators - Service Manual
3-52 Quantum Medical Imaging, LLC
• 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 3-32).
Editing a Film/Screen Combination Name
The system default Film/Screen Combination names are: Wall 72", Wall
40", Table 40", 100 Speed, 200 Speed, 800 Speed, Film/Screen7, and
DIGITAL (if "Digital Receptor" is enabled in the Service Configuration
Menu). These names, however, can be changed to suit individual
requirements. The following procedure describes the steps necessary to
edit the name of a film/screen combination using the "Edit F/S Name"
utility. Proceed as follows:
1. If not already done so, access the AEC Calibration Menu (see Figure
3-37).
2. Press the key next to the "Film/Screen" field (top left key) until the
desired film/screen combination is displayed. The possible default
selections are "Wall 72", "Wall 40"", "Table 40", "100 Speed", "200
Speed", "800 Speed", "Film 7", and "Digital" (if "Digital Receptor" is
enabled in the Service Configuration Menu).