Planmeca ProMax X-ray Instruction Manual page 166

Chapter E - C-ARM AND IMAGING ARM
From the list of Technical calibrations select DEC calibration (i630) .
Figure 123
To calibrate the Panoramic dynamic exposure control, select Panoramic DEC (i631) .
Figure 124
E-80 ProMax X-ray unit with Dimax3
OTHER ADJUSTMENTS AND CALIBRATIONS
Technical Manual