Planmeca ProMax X-ray Instruction Manual page 281

ADJUSTMENTS AND CALIBRATIONS Chapter H - CEPHALOSTAT
NOTE Check that the radiation beam can be seen entirely on the image receptor. The radia-
tion beam should not exceed the receptor.
If the radiation is not shown on the image receptor, calibrate the X-ray unit again and take
another exposure.
If the test report shows that the radiation can be seen on the image receptor, you can exit the
ProMax Beam Check program by selecting Exit from the File pull down menu.
ProMax X-ray unit with Dimax3 H-37
Technical manual