Calibration
4. Record the breakpoint at the corresponding kVp listing in the mA Limit File Editor Window.
5. Increase kVp to the next setting that is evenly divisible by 5 (in this case, 90 kVp). Reduce mA until the entrance exposure
rate does not exceed 9.26 R/minute. In the mA Limit File Editor, record the mA value by the corresponding kVp entry.
6. Repeat and record measurements, increasing kVp by five kVp each time, for the remaining kVp settings.
7. Once you have finished filling in mA values from the breakpoint, click Interpolate.
8. When the Least Squares Polynomial Window appears click OK.
9. In the mA Limit File Editor window, change the mode from Fluoro to HLF.
10. Select Manual Fluoro mode and Normal magnification. Select 40 kVp @ 20 mA. During an HLF Fluoro exposure, increase
kVp until the Dosimeter reading is close to but not over the maximum corrected exposure rate of 18 R/minute. This is the
breakpoint.
Note: 18.0 R/minute is maximum exposure rate of 20 R/minute minus 10 % (5% for setup errors and 5% for dosimeter errors).
11. Record the breakpoint at the corresponding kVp listing in the mA Limit File Editor window. For example, if you reached 18.0
R/minute at 85 kVp, enter 10 mA by 85kVp .
12. Increase kVp to the next setting that is evenly divisible by 5 (in this case, 90 kVp). Reduce mA until the entrance exposure
rate does not exceed 18.0 R/minute. In the mA Limit File Editor, record the safe mA value by the corresponding kVp entry.
13. Repeat measurements, increasing kVp by five kVp each time, for the remaining kVp settings.
14. Once you have finished filling in mA values from the breakpoint, click Interpolate.
15. When the Least Squares Polynomial window appears, click OK.
16. Click on File located in the upper left-hand corner.
17. Highlight and click on Save Ma Limit File As.
18. When the new window appears, the barcode should appear in the file name (if not, type it in) XXXXXXXX.mal (Mainframe’s
Barcode Number) then click on SAVE. Verify the File was saved.
19. Click on File located in the upper left-hand corner.
22
Service
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Schematics
Illustrated Parts
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