Appendix B Calibration (DiRex System)
Revision W HF Series X-ray Generators - Service Manual
B-16 Quantum Medical Imaging, LLC
NOTE: On systems equipped with high-speed
starter option (HSS), tube "high-speed" mode will
only be activated when selected exposure factors
exceed the limits used for low-speed operation.
3. The Tube Derating setting provides derating of the tube’s maximum mAs
output in percentages of 80%, 85%, 90%, 95% or 100% (i.e., no derat-
ing). For example, if at a particular kV and mA the tube normally allows
a 10 mAs exposure, then at 80% derating, the tube would permit only an
8 mAs exposure. Derating the tube can extend the life of the tube. Press
the button adjacent to the Derating field to choose a derating percent-
age.
4. The Heat Warning (heat%) provides a heat protection function for the x-
ray tube. For example, setting the Heat Warning for 80% will cause the
generator to produce an audible alarm and a visual "Heat Alarm" indica-
tion on the OCP when the tube has reached 80% of its total heat unit
capacity. The total tube heat unit capacity is dependant upon the tube
type. The Heat Warning setting has an adjustment range of anywhere
between 50% up to 100% in 10% increments. Note: At 100% setting,
the heat alarm is effectively disabled. Press the button next to the Heat
Warning field to select the percentage of the total tube heat capacity at
which alarm activation will occur.
5. Press the Back button on the lower left side of the screen. The system
returns to the Configuration Menu (see Figure 3-8).
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