Del Medical EPEX Omniflex IV, Service Manual

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EPEX/Omniflex IV System Service Manual
4-16 Adjustments and Calibration
X-ray Tube Calibrations
Prior to beginning tube auto-calibration, the tube used in this installation
must be properly selected, and the Generator limits should be programmed.
Refer to the procedures in the topic “Generator Setup Menu” on page 4-5.
It is recommended that the replacement tube(s) be conditioned (seasoned)
before beginning tube auto-calibration, refer to the first procedure in this
topic.
The following procedure produces X-rays. Take all safety precautions to protect
personnel from X-radiation.
Always verify the manufacturer of the tube insert. If the X-ray tube has been rebuilt,
the tube insert and tube housing may be different manufacturers.
Collimator blades must be closed and lead apron applied to the tube before starting
the tube calibration.
Conditioning the X-ray Tube
Tube conditioning or “seasoning” is particularly important for new tubes or
tubes that have not been used for several days. This should be performed
on each X-ray tube before attempting auto-calibration, as an unseasoned
tube may not operate properly at higher kV values without arcing. Refer to
the X-ray tube manufacturer’s instructions, if available, for the tube
conditioning or “seasoning” procedure. If the X-ray tube manufacturers
instructions are not available, use the procedure in this topic.
The Generator does X-ray tube auto-calibration at 50 kV, 60 kV, 70 kV,
80 kV, 100 kV, and 120 kV. The tube normally needs to be seasoned before
it can be operated at the higher voltages encountered during
auto-calibration.
With the GenWare utility, tube seasoning is started by auto-calibrating the
kV stations up to and including part of the 70 kV station. The tube is then
seasoned at 70 kV. Progressively higher kV stations are then
auto-calibrated and seasoned. Finally the entire kV and mA range is
auto-calibrated, then the tube is seasoned at the remaining high kV values.
Manually releasing the exposure button during auto-calibration of a
particular kV station in the following procedure prevents the Generator
from attempting operation beyond that kV/mA value.
WARNING
CAUTION
CAUTION