Discovery QDR Series Technical Manual
4-4
5. Loosen eight 1/4" bolts (4 on each side).
6. Move the C-arm until it is parallel to the tank using the digital level to measure
the angles.
4.4 X-Ray Beam Alignment
It is crucial that the X-ray beam be precisely aligned with the detector array because
improper alignment will directly affect the repeatability (coefficient of variation, or CV)
of the Discovery. Therefore, this alignment must be verified at the time of installation or
whenever any work is performed that may affect it.
To check beam alignment:
Insert the alignment fixture (see the following three figures) into the detector opening.
Figure 4-3. X-Ray Alignment Fixture (TLS-00080)
WARNING: X-rays are being generated during this procedure. Keep hands, head and other body
parts out of beam.
Alignment Pins
Holding Clamps
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