Portable X-ray Units
Service Manual
SM-1076R2
28
5. Make an exposure again to verify that the mA value in the Oscilloscope
is the one selected; if it is not, repeat the p rocedure from step 4.b. to
increase or decrease the value.
6. Once the correct mA value is reached, save the value pressing “Reset”
push-button (one beep will sound and the saved value is shown on the
kVp Display). It is important to write down this data for later reference
during calibration (refertoTable3-3).
Once a value for Filament Current is saved, the value remains in
memory for the next mA station. This feature helps to save time at
entering new data for the next station.
7. Repeat above procedure to calibrate the Filament Current for the
following kVp station and the non calibrated mA s tations, in the
corresponding Focal Spot. The Filament Current value is few steps
above the one calibrated before (refertoTable3-3).
Values above 999 are shown on mAs display as “= XX”, a.e. “=23“
means 1023.
8. To exit Calibration Mode, press and hold “Collimator Light” push-button
and then press and release “mAs Increase” push-button (two beeps
sound). Then release “Collimator Light” push-button.
At the end of the Filament Current calibration process there are
some stations that do not admit exposure, in that cases enter
manually the value following the trend. (Refer to Table 3-2 as an
example).
KEEP IN MIND THAT ALL FILAMENT CURRENTS SHOULD
HAVE A VALUE, EVEN THE ONES OUT OF RANGE
(EXPOSURES NOT ALLOWED). IN THAT CASES A
CONTINUOUS BEEP WILL SOUND AND THE VALUES ON THE
DISPLAYS BLINK.
IF THE D IP-SWITCH SW1-1 OF THE PORTABLE CONTROL
BOARD HAS BEEN SET IN “ON” POSITION TO ENABLE
SERVICE MODE, DO NOT FORGET TO SET IT IN “OFF”
POSITION (SERVICE MODE DISABLED) ONCE THE
CALIBRATION IS FINISHED.
Note .
Note .
Note .
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