Supplements to Service Instructions 3 - 3
Siemens AG SPR8-220.031.04 Page 3 of 4 MOBILETT Plus/ -E/ -HP
Medical Solutions Rev. 04 09.03 CS PS 24
10. Set kV to 102 and mAs to 20 and release an exposure.
11. Record the dose value measured with the dose meter.
12. Calculate the reference DAP value using the measured dose value according to
the following formula:
13. Record the DAP value measured with the DAP measuring system (DAP value
from display).
14. Calculate a comparison with the following formula:
The comparison value shows the deviation between the actual DAP value
(measured with the dose meter) and the DAP value measured with the DAP
measuring system. If the comparison value is negative, the DAP display shows a
value that is lower than the actual value, and vice versa.
If the comparison value is less than ±5%, the calibration is completed.
15. To correct the deviation, press the “UP” button on the calibration tool (for negative
comparison values) or the “Down” button (for positive comparison values).
Pressing a button once corresponds to approximately 0.5% change of the
comparison value.
16. Repeat steps 10. to 15. until the deviation is less than ±5%.
17. System OFF.
18. Remove the DAP calibration tool and reconnect the DAP ionization chamber to
board D70 (pos. 1 / Fig. 1).
19. System ON.
20. Press the reset and the test buttons to complete the calibration procedure.
Miscellaneous service issues 3
No further service or maintenance shall be performed on the DAP ionization chamber and
the DAP display. Note that the warranty becomes void if the DAP ionization chamber or
the DAP display are opened or altered in any fashion.
The middle push-button on the DAP calibration tool is for test
purposes. It has the same function as the test button on the DAP
display.
Reference DAP value measured dose value reference area unit
µ
Gy
m
2
()⋅=
Comparison value (%)
100 DAP value from display
⋅
Calculated DAP value
----------------------------------------------------------------------------------
100
–=
NOTE
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