GE Brivo OEC 715, Service Manual

Page: 256 / 551

Calibration
4-45
d. Connect Camera Cables, and make sure to tighten the secure screws.
e. Assemble the I.I. cover.
f. Power on the system.
Ensure the cable tightly connect to the I.I. Power Supply. Virtual connection will lead to
no image or image vibration in Fluoro.
4.6.6. Limiting Field Size (Collimator Iris Field Size)
Limiting Field Size Verification
1. Create a new exam.
2. Load a film cassette in the BAFT.
3. Make sure the iris is opened completely.
4. Make an exposure at 45kVp@0.5mA in Normal, MAG 1, MAG 2 for 5~10 seconds for each mode.
Take the three exposures on one sheet of film. Note: to select the Film MAG Mode, do the
following: Select Manual - Fluoro, then Normal, MAG1 or MAG 2 .
5. Remove the Film Cassette and develop the film.
6. Measure the Normal field size diameter of the collimator iris as projected on the film at 45 ° and
135 ° angle with the ruler.
7. Set the system to Normal field size, and take an exposure.
8. Measure, using the BAFT tick marks on the display monitor, the diameter of the circular image at
45 ° and 135 ° angle.
L1
L2