Filament
MAMMOMAT Balance SPB7-115.840.01 Page 31 of 62 Siemens AG
Troubleshooting Guide Rev.02 10.04 Medical Solutions
Calibration of filament current protection
After anode current calibration, maximum filament current at 20kV is known.
Maximum current level is calibrated by means of RV6 for the 0.1 mm small focus of IAE XM12 tube
The reference level for current limit is defined at 10% above the maximum filament current for each
focus.
Step by step calibration:
a) connect a voltmeter 10 Vdc f.s. on TP6(GND) and TP5.
b) select SMALL FOCAL SPOT
c) select 20kV
d) measure voltage on TP5/TP6 during preparation
e) connect a voltmeter 10 Vdc f.s. on TP1 and TP6(GND).
f) adjust RV6 till reaching a value equal to voltage measured at point (d) increased by +10%
Calibration of filament voltage protection
Step by step procedure:
a) verify that JP3 bridge is closed
b) connect a voltmeter 10 Vdc f.s. on TP6 (GND) and TP13.
c) select LARGE FOCAL SPOT
d) select 20 kV
e) measure voltage on TP13/TP6 during preparation
f) connect a voltmeter 10 Vdc f.s. on TP3 and TP6 (GND).
g) adjust RV3 till reaching a value equal to voltage measured on TP13/TP6 at above point (e)
+10%
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