Filament
MAMMOMAT Balance SPB7-115.840.01 Page 28 of 62 Siemens AG
Troubleshooting Guide Rev.02 10.04 Medical Solutions
Anode current calibration
• General information
Tube anode current mA is calibrated, for each value of kV and each focal spot, by means of filament
current I
f
.
Two levels of anode current mAL and mAH are defined for each focus.
mAH is related to lower part of kV range and mAL to higher part of kV range or mAs range.
mAL and mAH calibration is based on two similar but independent procedures.
• Calibration by internal instrument
Before entering any calibration mode, it’s necessary to select the manual mode and a value of mAs
equal to 40 for the 0.3 mm focus and 13 for the 0.1 mm focus.
In calibration mode, the following keys are active:
• Focal spot selection
• kV selection for whole values
• filament current adjustment by mAs + / - push buttons.
The anode current related to each value kV for each focus can be found in the Tube calibration report.
To enter mAH current calibration set DIP1 of SW1 ( PCB 01-170) = ON.
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