High Voltage generator
MAMMOMAT Balance SPB7-115.840.01 Page 34 of 62 Siemens AG
Troubleshooting Guide Rev.02 10.04 Medical Solutions
kV risetime is typically 1.5 ms in any load condition
Non invasive kV check
kV measurement with non-invasive instruments is affected by beam filtration and MUST be done
exclusively with MOLYBDENUM filter and without compression plate between x-ray source and kVp
meter.
kVp meter calibration factors, non linearity and filter thickness must be taken into consideration to
correct measured values.
kV check at TP1/TP2 PCB 94-132
H.V. generator has voltage divider on which kV check can be done by means of normal DVM with
1000 Vdc full scale or oscilloscope with probe able to withstand a minimum of 500 Vdc.
Connect DVM or oscilloscope to TP1/TP2 (GND) of PCB 94-132.
In the table below kV vs. VTP1 are given.
kV
VTP1 (±1%)
20 kV
279 Vdc
21 kV
293 Vdc
22 kV 307 Vdc
23 kV 320 Vdc
24 kV 334 Vdc
25 kV 348 Vdc
26 kV 362 Vdc
27 kV 376 Vdc
28 kV 390 Vdc
29 kV 404 Vdc
30 kV 418 Vdc
31 kV 432 Vdc
32 kV 446 Vdc
33 kV 460 Vdc
34 kV 474 Vdc
35 kV 488 Vdc
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