Appendix B Calibration (DiRex System)
HF Series X-ray Generators - Service Manual Revision W
Quantum Medical Imaging, LLC B-39
8. Take an exposure at the setting indicated on the MA Calibration Screen
(i.e., 60 kVp, 400L mA, 100.0 mS).
9. On the Dynalyzer Digital Display or on mAs meter, observe the measured
mA value. (Ideally, this value should be 400 mA or 40 mAs.)
10. If not 400 mA, press the 400 mA adjustment (located directly below
"Measured MA#2" label). Find the measured mA value in the scrollable
list, select it then press Enter. The values appearing in the list are in
one-tenth increments.
11. Press Save Calibration button.
12. Repeat mA calibration for 400L mA until indicated and measured mA val-
ues agree to within 5%+1 mA.
Note: The Power Supply Board’s +48 VDC output
may require adjusting (using potentiometer
A6R17) up to +55 VDC (max.) in cases where
long-length high tension cables are used and/or a
heavy duty x-ray tube is installed. This can be
determined by measuring the mA output (using a
Dynalyzer or mAs meter) of an exposure taken at
40 to 50 kVp and the highest mA station available.
The mA measured should be the same as the indi-
cated mA (within specified tolerance). If mA out-
put is too low, increase the +48 VDC voltage
output as required, but do not exceed +55 VDC.
13. To return to the main calibration screen, press the Back button. If the
system is equipped with QG-AEC option, perform AEC calibration. Other-
wise, calibration is complete.
CAUTION! If using a mAs meter, re-connect the
green/yellow wire marked "MAS METER" to the
ground stud on top of the H.V. Transformer (see
Figure B-22).
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