HF Series Generators
Calibration
CA-1036R2
48
6. Select the maximum PPS and Non-ABC mode. Make a Fluoro exposure
at maximum kV that will be used in the system and measure the dose
applied, it should not be over the Rejection Limits for 10 R/min
(87mGy/min)or5R/min(43.5mGy/min)(refertoTable2-2.).
In case that the value is not acquired, change the Fluoro Filament Setting
stored in E17 as required until it is correctly calibrated to that dose. Keep
in mind that radiation increases or decreases in accordance to value in
E17 is increased or decreased.
7. The mA values displayed during Fluoro exposures are stored in E25, E26
and E27 Memory Locations. The method used to obtain the Fluoro mA
values is to measure the average mA using a mA meter in Fluoro.
During Fluoro exposure, mA values are read directly with a mA Meter in
DC connected to the mA Test Points (banana plug connections) on the
HV Transformer. Only for this purpose, remove the link between the
banana plug connections on the HV Transformer.
Select the maximum PPS and Non-ABC mode. Make the following
Fluoro exposures:
G Make a Fluoro exposure at 50 kV and take note below the mA
reading, this value will be used as Fluoro mA at minimum kV (E25).
G Make a Fluoro exposure at 80 kV and take note below the mA
reading, this value will be used as Fluoro mA at medium kV (E26).
G Make a Fluoro exposure at 120 kV and take note below the mA
reading, this value will be used as Fluoro mA at maximum kV
(E27).
FL mA value at 50 kV
(E25)
FL mA value at 80 kV
(E26)
FL mA value at 120 kV
(E27)
8. Remove the Dosimeter and the Lead Apron (Blocker).
9. Exit from the “User Mode” screen by pressing “Manual Calibration”
button.
10. Select E19 Memory Location if it is required to reduce the value for the
maximum Fluoro kV in the installation.
11. Select the E25, E26 and E27 Memory Locations and store the respective
mA values noted before multiplied by 10 (a.e. if the mA value noted is
“3.2”, store the value “32” in the respective Memory Location).
12. Record the new values in the Data Book.
13. Exit calibration mode.
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