Chapter E: CALIBRATIONS 2 CALIBRATING DYNAMIC EXPOSURE CONTROL (DEC)
Technical manual Planmeca ProOne 115
The calibration value will be shown in the
New target value
field on the
DEC calibration
(T3440)
display. The new target value has to fall between 200 and 2000. Typically the
target value ranges between 600 and 1000.
If the new target value is below 200, the X-ray beam must be realigned. If the new target
value is above 2000, the DEC calibration tool does not fully cover the first collimator step.
Exit the
DEC calibration
(T3440)
display and accept the new target value by touching the
green check mark button in the bottom right corner of the display.
If you then reenter the
DEC calibration (T3440)
display the target value of this exposure will
now be shown in the “Saved target value” field.
Now take three test exposures using the Romexis software program. Enter the main
display and touch the DEC button in the top left corner to turn DEC on. Select exposure
program “Panoramic standard”, adult patient size and jaw size & shape “Average &
normal”.
1. First test exposure: Leave the DEC calibration tool in place. On the main display, select
the exposure values you used on the DEC calibration (T3440) display. Take an
exposure. After the exposure, check on the main display that the exposure values
remain unchanged.
2. Second test exposure: Leave the DEC calibration tool in place. On the main display,
reduce the exposure values by deducting 4 kV and 4 mA from the values you used in
the first test exposure. Take an exposure. After the exposure, check on the main
display that the exposure values have now been increased (see note below).
3. Third test exposure: Remove the DEC calibration tool. Position the sensor calibration
block (part number 10016995) in the middle of the sensor head as shown in figure on
page E-29. On the main display, select the highest possible exposure values (70kV/
7mA). Take an exposure. After the exposure, check on the main display that the
exposure values have now been decreased (see note below).
The kV value will be adjusted by max ±4 kV. However, if the starting value is e.g. 68 kV the
value will be increased by only 2 kV (available kV scale: 60-70). The mA value will be
adjusted by max +4/-3 mA. However, if the starting value is e.g. 7 mA the value will not be
further increased (available mA scale: 2-7).
If you fail to meet the criteria specified above for the three test exposures, perform
following checks:
• Make sure that the DEC function has been turned on.
• Check the position of the X-ray beam. Refer to section 1.4 "Step 1: Adjusting the X-
ray beam position" on page 92.
• Check the position of the DEC calibration tool. The DEC calibration tool has to fully
cover the first collimator step (adult setting) as shown in figure on previous page.
Then repeat the DEC calibration procedure as described above.
After successful DEC calibration, remove the sensor calibration block (part number
10016995) from the sensor head and reattach the inner tube head cover.
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