Preva Installation/Service Manual, 00-02-1577, Revision E01
57
Do not use this procedure immediately after Tubehead
replacement.
Refer to Page 74 for the Calibration procedure.
X-ray tubes that sit dormant for several months can become electrically
unstable. To remedy this condition, perform a “new tube seasoning
procedure.” This process establishes stable high voltage operation and will
ultimately extend the life of the tube. Repeat this procedure before returning to
normal operation any time the system has been unused for more than two
months.
1. Verify system operation.
2. Energize the system.
3. Select 60 kilovolts (kV), 7 milliamperes (mA), and the exposure time of one
second.
4. Make five exposures at this level, observing the normal cooling time.
5. Select 65 kV, 7 mA, and the exposure time of one second.
6. Make five exposures at this level, observing the normal cooling time.
7. Select 70 kV, 6 mA, and the exposure time of one second.
8. Make five exposures at this level, observing the normal cooling time.
Responsibilities of the Installer and Service Engineer
Verification of machine performance after installation must be performed according to the guidelines
identified in the “System Function Checklist” on page 56.
Verification of machine performance after maintenance or repair must be performed according to
the guidelines identified in the “System Function Checklist” and the calibration instructions which can be
found in the Installation and Service Manual.
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