Chapter E - C-ARM AND IMAGING ARM
E-76 Planmeca ProMax
OTHER ADJUSTMENTS AND CALIBRATIONS
Technical Manual
Take three test exposures from the AEC/DEC calibration tool as follows. Enter the Main dis-
play. Switch on the DEC function and select normal+average jaw size.
1) First exposure: Use the OD exposure mA and kV values. Take an exposure. Check in
the Main display that the kV and mA values are not changed during the exposure.
2) Second exposure: Increase mA value by 4mA from the original value. Take an
exposure and after the exposure check in the Main display that the kV and mA values
have been decreased.
3) Third exposure: reduce mA value by 4mA from the original value. Take an exposure
and after the exposure check in the Main display that the kV and mA values have been
increased.
If the kV and mA values are not correctly adjusted during the exposure, perform the fol-
lowing checks:
1) Make sure that the DEC function is ON.
2) Check the panoramic beam alignment (position and width) according to the instructions
given in section 2.2 “Checking the panoramic beam position” on page E-7.
3) Check that the AEC/DEC calibration tool covers the primary collimator opening.
After the checks perform the DEC calibration again. Remove the AEC/DEC calibration tool
and attach the removed covers.
NOTE All the calibration parameters are stored into the memory making it possible to modify
the calibration without a new exposure if the film density is found to be non satisfac-
tory.
Maximum correction to the set values
The kV and mA values are adjusted during the exposure when the DEC function is on.
The scale of the kV value is between 54kV and 84kV and it can be adjusted by + 4kV to - 4kV.
Note that if the kV value is e.g. 82kV it can only be increased by 2kV.
The scale of the mA value is between 1mA and 16mA and it can be adjusted by + 4mA to -
3mA. Note that if the mA value is e.g. 15mA it can only be increased by 1mA.
NOTE The kV and mA values are adjusted to the same direction (increased or decreased). For
example: if the measured value is 40% from the reference value, the kV value is
increased by 2kV and the mA value is increased by 3mA.
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