HF Series Generators
Calibration
CA-1036R2
46
• E19 is used to set maximum Fluoro kV. This value is determined by the
type of TV camera and type of images desired. For general fluoroscopic
use with a conventional TV system, 120 kV is recommended. A lower
maximum setting will produce more contrast on the TV system but less
penetration for large patients.
• E25, E26, E27 are used to calibrate the Fluoro mA Display. These v alues
will be shown on the Fluoro mA Display during Fluoro exposures
whenever maximum PPS are selected.
The Fluoro mA Display values entered into the Extended Memory
Locations E25, E26 and E27 are also used to calculate Heat Units.
It is important to enter accurate values.
Fluoro functions are calibrated by performing the following steps:
1. Turn the generator ON.
Make sure that the Small Filament of the X-ray tube is properly
warmed-up (at less 15 minutes).
2. Set up a Dosimeter to measure the Maximum Entrance Skin Exposure
Dose Rate. Position the Probe at the center of the primary beam with the
entire active volume w ithin the primary beam.
Place the Tube-Collimator Assembly as close as possible to the
Table-Top, fully open the C ollimator Blades and align the Image
Intensifier with the light beam. Block radiation input to Image Intensifier
with a Lead Apron. (Refer to Illustration 2-4).
3. Enter in “Manual Calibration” mode through a Fluoro workstation and
read the Filament Number at 120 kV / 10 mA. Divide this value by four
(4) and enter it as starting value for E17 Memory Location (Fluoro
Filament Setting).
4. Select E19 Memory Location and set the maximum Fluoro kV at 120 kV
or more if it is possible.
5. Enter in user mode inside calibration mode by pressing the “Go to User
Mode” button and select the Fluoro Menu.
Note .
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