Quantum ODYSSEY HF Series User Manual

Appendix B Calibration (DiRex System)
HF Series X-ray Generators - Service Manual Revision W
Quantum Medical Imaging, LLC B-35
3. If using an oscilloscope, connect the scope leads between test point TP7
on KVP Control Board A2 (AY40-003S) and ground. Set scope for 1.0 volt/
division, and 50 ms/division time base. This will give a 100 mA/volt equiv-
alent for mA measurement as shown in the sample waveforms in Figure
B-20.
4. Take an exposure at the setting indicated on the Filament Calibration
Screen (i.e., 70 kVp, 75s mA, 15 msec).
If using an oscilloscope, set time
to 50 msec
.
5. On the Dynalyzer Digital Display or mAs meter, observe the measured mA
value. (Ideally, this value should be 75 mA or 1.125 mAs.) If using an
oscilloscope, observe the small filament current pulse waveform for "flat-
ness" (see Figure B-20).
6. If not 75 mA, or if waveform is not flat, press the small filament offset
value button (located directly below "Filament Small" label). The filament
offset amperage values (in hundredth increments as shown in the sample
screen below) range from +10.00 down to -10.00, with 0.00 equating to
no offset applied to the tube’s default filament curve. To increase mA,
raise the filament offset value; to decrease mA, lower the filament offset
value.
Figure B-23. Sample Filament Offset Values Screen
7. Re-take exposure at same settings and adjust small filament offset value
if necessary. Repeat this step until measured mA equals 75 or when
waveform is sufficiently flat. Press the Small Filament button to pro-
ceed.

Quantum ODYSSEY HF Series Specifications

General

Brand	Quantum
Model	ODYSSEY HF Series
Category	Medical Equipment
Language	English