HF Series Generators
Calibration
CA-1036R2
43
5. Activate “Digital Prep” (--DIGITAL PREP signal = GND on TS3-7
Generator Cabinet). Hold “Digital Prep” and adjust the high voltage
applied to the Photomultiplier Tube with the potentiometer R12 for Board
A3012--x1/x2/x5 or R23 for Board A3012--x6/x7/x9 on the AEC Control
Board until measure --400 VDC between TS1--39 and TS1--42 (GND) in
the Generator Cabinet.
6. The Dose is affected in the following manner:
G Increases when the high voltage applied to the Photomultiplier
Tube is decreased. (Example: if 100
μ
R Dose is obtained with
--400 VDC, 200
μ
R Dose may be obtained decreasing the high
voltage to --300 VDC).
G Decreases when the high voltage applied to the Photomultiplier
Tube is increased. (Example: if 100
μ
R Dose is obtained with --400
VDC, 50
μ
R Dose may be obtained increasing the high voltage to
--450 VDC).
7. Make an exposure and adjust the following potentiometer on the AEC
Control Board: R12 for Board A3012--x1/x2/x5 or R23 for Board
A3012--x6/x7/x9 on the AEC Control Board; until getting a Dose around
100 μR per frame (at 9” FOV)(for more information refer to the Image
System documentation).
If the photo tube voltage required is too low, decrease the AEC
calibration number in the E23 Memory Location and repeat the
process.
8. Record the E23 Memory Location in the Data Book.
Note .
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