HF Series Generators
Calibration
CA-1036R2
21
9. After performing both procedures (for Small and Large Focal Spots),
enter in “Manual Calibration” mode and select each combination of the
available mA stations for each Focal Spot at the kV break points (40, 50,
80 and 120 kV). Press the “Read” button to read on the calibration panel
the new value of the Filament Current Number stored for each
combination and record the new values in the Data Book.
Note that the highest mA station for Small Focal Spot may have numbers
larger than the lowest mA station for Large Focal Spot. This is normal.
10. Exit from calibration mode.
11. Perform the Auto-calibration procedure for the second X-ray Tube.
12. Turn the Generator power OFF and set Dip Switch 3000SW2-4 on the
HT Controller Board in “Off” position (Digital mA Loop Closed).
2.5.2 MANUAL CALIBRATION OF DIGITAL mA LOOP OPEN
This procedure describes the Manual calibration of all the Filament Current
Numbers. It has to be also used to calibrate the kV / mA combinations not
performed during Auto-calibration procedure because it has not been
completed. These combinations have the Filament Current Number set to
“344”, so only these combinations have to be manually calibrated as described
in this procedure. If Auto-calibration for one of the Focal Spots has been
successful, it is only required to perform the manual calibration of the mA station
do not calibrate for the other Focal Spot.
Manual Calibration is initiated at the 80 kV break point by entering the
appropriate Filament Current Number for the proper tube current at each
selectable mA. Calibration at the other kV break points (40, 50, 80 and 120 kV)
are obtained by adding or subtracting values as indicated in Table 2-1.
Although the suggested values (Table 2-1) could change depending on the
X-ray tube used, entering those values will approximate accurate calibration
without making excessive exposures.
In “Manual Calibration” mode, the Filament Current Numbers are shown on the
calibration panel by pressing the “Read” button after s electing the respective
kV / mA combination. The value can be c hanged by pressing the “Increase” or
“Decrease” buttons of the calibration panel and stored by pressing the “Store”
button.
Note that in calibration mode, only the mA stations and kV (at the break points)
can be selected.
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