Siemens MAMMOMAT Balance - Page 29

Filament
MAMMOMAT Balance SPB7-115.840.01 Page 29 of 62 Siemens AG
Troubleshooting Guide Rev.02 10.04 Medical Solutions
To enter mAL current calibration set DIP2 of SW1 ( PCB 01-170) = ON.
In the mAs window of the display, the following parameters will appear:
•
mAH or mAL, filament current I
f
in Ampere;
•
mAs value selected before entering calibration mode
•
after exposure , expected anode current value and exposure I
a
in mA.
After exposure the following condition can be reached:
a) Anode current less than 70% of the expected value
in place of the anode current value, on the display LLL.L will appear.
It means that exposure ended by means of Back-Up Timer.
Increase I
f
filament current by 0.050 and repeat the exposure.
If the display indication is still LLL.L, repeat the above point till you get the indication of mA value
and no more the [LLL.L]
b) Anode current higher than 10% above expected value
in place of the anode current value, on the display HHH.H will appear.
Decrease I
f
filament current by 0.050 and repeat exposure.
If the display indication is still HHH.H, repeat the above point till you get the indication of mA and
no more the HHH.H.
mAH I
f
4,710 A
90 I
a
90,1 mA
mAs 40