7 High tension power supply
MAMMOMAT Balance
SPB7-115.831.01 Page 16 of 22
Siemens AG
Maintenance Instructions
Rev.01 05.04
Medical Solutions
KV
VTP1/2 (
±
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
kV to TP1/TP2 PCB 94-132 conversion table
Values form the above table are valid only if VTP8 is 5.00 Vdc (standard calibration).
If for any reason kV are not correct within no more than 1kV calibration is possible
By means of RV5 PCB 94-132.
If calibration is necessary, Pivot value is 28kV
kV values are not affected by the replacement of Inverter or H.V. transformer if VTP8
is 5.00Vdc (standard calibration).
PMF External kV check
Measurement of the kV value with non-invasive instruments MUST be done exclusively with
Molibdenum anode and Molibdenum filter without compression plate.
Measurement of the kV value done with non-invasive instruments is affected by intrinsic linearity error
depending on the kV. It is advisable to refer to the instrument manual and in particular to the
indications about corrective coefficients depending on the kV and the thickness of the Molybdenum
filter. A tube that shows metallization problems on the ray window does not allow correct non invasive
measurement of the kV and MUST nevertheless be replaced.
The most reliable and precise measurement is done with an external HV divider.
NOTE