Del Medical EPEX Omniflex IV, Service Manual

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EPEX/Omniflex IV System Service Manual
4-20 Adjustments and Calibration
Collimator System Calibration
System Adjustments and Calibration
In order to correctly set-up and operate the Collimator, it is necessary to
adjust all the potentiometers sensing circuits. Refer to the Collimator,
Overhead Tube Crane, and Table service manuals for the following setup
and calibration procedures.
• Horizontal Leveling for the X-ray Tube
• 0 Degree Rotational Adjustment for the X-ray Tube
• Vertical Drive Chain Adjustment for the OTC
• Horizontal Source Image Distrance (HSID) Adjustment
Refer to the A, B, and C detent setup drawings in Figure 4-1 on
page 4-23, Figure 4-2 on page 4-24, and Figure 4-3 on page 4-25.
• SID Potentiometer Adjustment – Continuous SID Sensing
The position sensing potentiometers must have 1-
Κ Ω
resistance and
linearity equal or better than 1%.
It is also very important that the potentiometer is used for at least 75% of
its total travel (75
Ω
for the total travel).
It is not necessary to set the potentiometer in the way that, in a particular
position of the movement, the resistance has a particular value; in fact, it is
enough that the minimum resistance of the potentiometer is less than
100
Ω
.