Aec Precalibration Checks; Aec Chamber Installation - CPI CMP 200 Series Service Manual

CPI Canada Inc.
3D.9.2 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. Note that some chamber types must
be physically isolated from equipment ground, refer
to figure 3D-11 as an example.
2.
Verify that each AEC chamber / pickup is properly
connected to its intended input channel on the AEC
board.
3.
Make and type of AEC chamber/pickup:
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.
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.
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)?
3D.9.3 AEC Chamber Installation
Figure 3D-11 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.
Use and disclosure is subject to the restrictions on the title page of this CPI document.
®
CMP 200 Service Manual
Table 3D-13: Precalibration checklist
Ch # 901476-05 Rev. A
CHECK:
CHECK:
AEC Ch 1_____________________________
AEC Ch 2_____________________________
AEC Ch 3_____________________________
CHECK:
CHECK:
3D
AEC Calibration
Page 3D-39