Automatic Exposure Control (Aec) Calibration; Checking/Adjusting The Primary Slot Position - Planmeca Proline CC Technical Manual

Chapter
D - ADJUSTMENT & CALIBRATION
8

AUTOMATIC EXPOSURE CONTROL (AEC) CALIBRATION

NOTE
8.1

Checking/adjusting the primary slot position

+
CEPH
CTL
AUTO
AEC calibration filter
D-26 Planmeca Proline CC panoramic x-ray
If the x-ray unit is equipped with optional Automatic Exposure Control (AEC), the AEC cal-
ibration must be performed after the AEC retrofit kit installation and whenever the pano-
ramic x-ray beam is adjusted. The AEC calibration is performed after the panoramic x-ray
beam adjustment.
Perform the AEC calibration in the following order:
1. Check/adjust the panoramic x-ray beam.
2. Adjust the positions of primary slots number 0 and 1 so that the AEC signal value is as large as
possible.
3. Adjust the base value so that the film density is 1.0 ±0.1 OD.
4. Adjust the AEC detector offset value (base signal) to value 8 ±2. The offset value is shown on
the main display when the unit is in the AEC mode and no exposure is taken.
5. Adjust the AEC-signal value to approx. 60. During the exposure this AEC-signal value is
shown on the main display.
6. Fine adjust the AEC-signal in normal mode.
After the panoramic x-ray beam adjustment the AEC-signal for primary slots number 0 and 1
must be checked. The position of the slot must be adjusted so that the AEC-signal value is as
large as possible, and the value for the primary slot number 1 must be equal to the value for pri-
mary slot number 0.
Enter the service mode: press the CTL-key and simultaneously press and hold down the cepha-
lometric mode selection (CEPH) key until the temperature of the tube head appears on the dis-
play (about four seconds). The ready key indicator light will start to flash. This indicates that you
have entered the service mode.
Enter the AEC mode by pressing and holding down the auto key until the indicator light will come
on.
Place the AEC calibration filter to the front of the first primary slot.
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