Appendix D Calibration (Using Generator Service Tools)
Revision W HF Series X-ray Generators - Service Manual
D-48 Quantum Medical Imaging, LLC
"Ion Chamber Tab" configuration procedure described previously in this
appendix and re-configure. Proceed as follows:
1. If not already done so, a kVp bleeder tank should be connected in series
between tube and High-Voltage (H.V.) Transformer A17. If using a mAs
meter, connect the mAs meter between pins A17P1-9 and A17P1-10 on
H.V. Transformer A17.
2. Access Generator Settings Screen (see Figure D-4). Make a note of the
Backup MAS setting, then change the Backup MAS to "40".
3. Press the Manual/AEC Mode button on the operator control panel and
select AEC mode.
4. Using a lead sheet, cover the UPPER RIGHT and CENTER ion chamber
detectors.
5. Place 20 CM acrylic over UPPER LEFT ion chamber detector.
6. Set operator control panel for 100 KV, 200L MA, select the UPPER LEFT
ion chamber detector and take an exposure. Note the measured mAs
reading.
7. Repeat above steps with the CENTER ion chamber detector selected and
UPPER LEFT and UPPER RIGHT detectors covered with lead. The mea-
sured mAs reading should be within 5% of the mAs reading noted in the
previous step. If not, adjust the CENTER detector gain potentiometer
located on the ion chamber amplifier (refer to ion chamber manufac-
turer’s documentation for details), then re-take exposure and verify it is
within tolerance. Repeat as necessary.
To Next Page
Loading...
Need help?
General
