HF Series Generators
Calibration
CA-1036R2
25
10. Complete the calibration process for all mA stations at 80 kV as
described before. When select the first mA station for the Large Focal
Spot, enter as a filament number the value calibrated for the first mA
station for the Small Focal Spot. Note that the h ighest mA station for
Small Focal Spot may have numbers larger than the lowest mA station
for Large Focal Spot. This is normal.
Press the “Read” button to read on the calibration panel the new value
of the Filament Current Number stored for each mA station at 80 kV.
Record the new values in the Data Book.
When highest mA stations of the Generator can not be calibrated
at 80 kV due to insufficient filament current (the filament current
number has reached the maximum number (999)), replace on the
Filament Board (A3004--09/10) the Resistor R11 for another
resistor with 1.4
Ω /
5 W, and place Jumper JP1 in position “ A”.
Then rename the Filament Board as A3004-- 11.
ATTENTION: After doing this modification reduce the value
of all the filament current numbers (column for 80 kV) at the
25% and perform the calibration procedure again (from
step-5).
11. Complete the calibration process for the remaining kV / mA combinations
using Table 2-1 as a guide. It is not necessary to make exposures to do
this. Compute the value for all the kV break points of each available mA
station although the Generator power can not reach all the kV / mA
combinations. Select the corresponding kV / mA combination and enter
the computed value.
12. Check calibration at all break points (making exposures) and correct any
calibration points as needed.
If “Tube Overload” error is s hown directly after selection of an
allowed combination (refer to step-5.), wait until the X-ray tube
anode cools down to permit the calibration of the mA station.
13. Recalculate the values of the non-allowed combinations in accordance
to the new values obtained by exposures. (RefertoTable2-1).
Note .
Note .
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