Non Invasive K Vcheck; K Vcheck At Tp1/Tp2 Pcb 94-132 - Siemens MAMMOMAT Balance Troubleshooting Manual

Non invasive kV check
kV measurement with non-invasive instruments is affected by beam filtration a nd 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.
MAMMOMAT Balance
Troubleshooting Guide
kV risetime is typically 1.5 ms in any load condition
kV
20 kV
21 kV
22 kV
23 kV
24 kV
25 kV
26 kV
27 kV
28 kV
29 kV
30 kV
31 kV
32 kV
33 kV
34 kV
35 kV
SPB7-115.840.01 Page 34 of 62
Rev.02 10.04
High Voltage generator
VTP1 (±1%)
279 Vdc
293 Vdc
307 Vdc
320 Vdc
334 Vdc
348 Vdc
362 Vdc
376 Vdc
390 Vdc
404 Vdc
418 Vdc
432 Vdc
446 Vdc
460 Vdc
474 Vdc
488 Vdc
Siemens AG
Medical Solutions