Planmeca ProMax X-ray Instruction Manual page 169

OTHER ADJUSTMENTS AND CALIBRATIONS
NOTE
NOTE
NOTE
Technical Manual
When the exposure cycle is completed the text Complete is shown on the Panoramic DEC
display.
Figure 128
The reference value is recommended to be between 150-500.
If the reference value is greater than 500, decrease the mA value and if the reference value
is smaller than 150, increase the mA value. Then perform the OD exposure again.
The altered exposure value (mA) is not automatically updated to the exposure value
setting on the Main menu.
If the value is near zero, the panoramic beam must be re-aligned and if the value is
thousands, the AEC/DEC calibration tool does not properly cover the primary collima-
tor opening.
To accept the DEC parameters touch the Done field on the Panoramic DEC display and Exit
field on the DEC calibration display.
Take three test exposures from the AEC/DEC calibration tool as follows. Enter to the Main
display. Switch on the DEC function and select normal+average jaw size.
1) First exposure: Use the OD xposure 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 1.2 "Checking the panoramic beam position" on page E-4.
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.
Chapter E - C-ARM AND IMAGING ARM
ProMax X-ray unit with Dimax3 E-83