3D
AEC Calibration
CPI Canada Inc.
Page 3D-10
Rev. D Millenia / Indico 100 Series Service Manual Ch # 740904-06
3D.2.2 AEC
Precalibration
Checks
It is recommended that a copy of the form below be filled in with the required information before attempting
AEC calibration.
1.
Verify that the AEC chambers are mounted correctly
in the bucky or spot film device. Note that some
chamber types must be physically isolated from
equipment ground, refer to figure 3D-6 as an
example.
CHECK
√
:
2.
Verify that each AEC chamber/pickup is properly
connected to its intended input channel on the AEC
board.
Refer to AEC board pictorials, figure 3D-8 to 3D-
10 for input channel designations
CHECK
√
:
3.
Make and type of AEC chamber/pickup:
AEC Ch 1_____________________________
AEC Ch 2_____________________________
AEC Ch 3_____________________________
AEC Ch 4_____________________________
4.
Verify signal grounding for the AEC chamber. The
only electrical ground should be at the AEC board in
the generator. This applies to the ground braid
(shield) for the AEC signal cable and to the ground
return conductor(s) in the AEC signal cable.
CHECK
√
:
5.
Verify that the AEC board is fully inserted into the
mating edge connector (if applicable), that all
connections to the AEC board are secure, and that
the AEC board is properly fastened to the door
support panel.
CHECK
√
:
6.
Before calibrating, verify that the AEC system is
functioning. This includes the AEC
chambers/devices and the AEC circuits in the
generator. Each of the fields on the AEC device
must be able to terminate the exposure.
CHECK
√
:
7.
Radiographic techniques to be performed with the
equipment (high kV chest, G.I. studies etc)?
8.
Normal exposure factors used by the customer
(typical mAs/kV range)?
Table 3D-3: Precalibration checklist
3D.2.3 AEC
Chamber
Installation
Figure 3D-6 shows an installed AEC chamber. Note particularly the use of a suitable insulating material to
isolate the body of the chamber from the receptor ground. This is required for non-insulated AEC chambers.