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DX-D 400
User Manual
142
7.
Select "Center" Ion Chamber and Density "Normal - - 0".
Make a RAD exposure and note the exposure mAs and time. For a
proper functioning of the AEC, the exposure must not be aborted by the
AEC back-up timer, that is, the "AEC Reset" push-button is not flashing.
8.
Deselect "Center" and select "Left" Ion Chamber.
Make a RAD exposure and note the exposure mAs and time. For a
proper functioning of the AEC, the exposure must not be aborted by the
AEC back-up timer, that is, the "AEC Reset" push-button is not flashing.
9.
Deselect "Left" and select "Right" Ion Chamber.
Make a RAD exposure and note the exposure mAs and time. For a
proper functioning of the AEC, the exposure must not be aborted by the
AEC back-up timer, that is, the "AEC Reset" push-button is not flashing.
10.
The noted Exposure mAs and time have to be equal ¦10% between
all three Ion Chambers. If not, contact Service.
11.
Repeat the above steps changing the Density and/or the homogeneous
phantom (e.g. a bucket with 5 cm of water).
Compare the Exposure mAs and time between each Ion Chamber and
between the values noted before (for a lower density or less water, lower
mAs and a shorter time; for half of density or half of water, half of mAs
/ time). If not, contact Service.
12.
Finally, check the proper functioning of the AEC back-up timer by making
a RAD exposure with the selections indicated in step 6., but with the
Collimator blades fully closed.
The exposure must be finished by the AEC back-up timer, that is, the
exposure length is 1.0 second and the "AEC Reset" Push-button is
flashing. If not, contact Service.
0232F EN 20191213
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