![Quantum ODYSSEY HF Series Скачать руководство пользователя страница 141](http://html1.mh-extra.com/html/quantum/odyssey-hf-series/odyssey-hf-series_service-manual_3538349141.webp)
Chapter 3 Calibration
HF Series X-ray Generators - Service Manual
Revision W
Quantum Medical Imaging, LLC
3-49
AEC Ion Chamber Balancing (Three-field Chambers)
On systems using a three-field ion chamber, the chamber detectors must
be balanced prior to performing AEC calibration (refer to the ion chamber
manufacturer’s instruction manual). When balanced, the mAs will be
approximately the same (±5%) for exposures taken using any of the
three chambers, or with two or more chambers selected simultaneously.
This procedure must be performed on each ion chamber used in the sys-
tem (for example, both table and wall ion chambers when equipped with
two). Before proceeding, check that the ion chamber detectors have
been correctly configured so when the chamber select keys on the opera-
tor control panel are pressed, the appropriate ion chamber detector is
enabled. If not, refer to "Table/Wall Ion Chamber Configuration Screens"
procedure described previously in this chapter and re-configure. Pro-
ceed 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 Service Settings Menu (see Figure 3-16) and select Back Up
Time/MAS.
3. In AEC Backup Setting screen (see Figure 3-22), make a note of the
Backup mAs setting, then change the Backup MAS to "40".
4. Press the AEC Mode key on the operator control panel to enter AEC
mode.
5. Using a lead sheet, cover the UPPER RIGHT and CENTER ion cham-
ber detectors.
6. Place 20 CM acrylic over UPPER LEFT ion chamber detector.
7. Set OCP for 100 KV, 200L MA, select the UPPER LEFT ion chamber
detector and take an exposure. Note the measured mAs reading.
8. Repeat above steps with the CENTER ion chamber detector selected
and UPPER LEFT and UPPER RIGHT detectors covered with lead.
The measured 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 manufacturer’s documentation for details), re-take exposure
and verify it is within tolerance. Repeat as necessary.
9. Access the Service Settings Menu and reset Backup mAs to original
setting noted previously.
Содержание ODYSSEY HF Series
Страница 1: ...Service Manual ODYSSEY Q VISION HF Series X ray Generators Manual Part No DC30 011 Revision W...
Страница 15: ...Chapter 1 1 SPECIFICATIONS 1...
Страница 16: ...1 2...
Страница 37: ...Chapter 2 1 ASSEMBLY INSTALLATION 2...
Страница 38: ...2 2...
Страница 93: ...Chapter 3 1 CALIBRATION 3...
Страница 94: ...3 2...
Страница 165: ...Chapter 4 1 THEORY OF OPERATION 4...
Страница 166: ...4 2...
Страница 185: ...Chapter 5 1 SERVICE INSTRUCTIONS 5...
Страница 186: ...5 2...
Страница 281: ...Chapter 6 1 DIAGRAMS 6...
Страница 282: ...6 2...
Страница 349: ...A 2...
Страница 364: ...B 1 CALIBRATION Agfa DiRex B Appendix...
Страница 365: ...B 2...
Страница 420: ...C 1 Log4View Error Logger C Appendix...
Страница 421: ...C 2...
Страница 428: ...D 1 CALIBRATION Using Generator Service Tools D Appendix...
Страница 429: ...D 2...