Test Of Kv Accuracy - Siemens MOBILETT Plus Maintenance Instructions Manual

42
2.7

Test of kV accuracy

Fig. 21:
Requirement:
The measured kV values must lie within the limit values listed in the table.
NOTE
Required measurement devices:
kV meter that works with the filter comparison method, e.g. the PTW Nomex. Use the cor-
rection factor indicated in the kV meter operating instructions for non-invasive kV mea-
surements. If there is no kV meter available, the measurement can also be performed with
an oscilloscope at test points "HTPEAK" and "GND" on board D1. The measurement
result is 40 kV/V.
NOTICE
Procedure:
•
Prepare the kV meter for the measurement (refer to the operating instructions for the kV
meter).
•
Place the measuring detector on a tabletop or other suitable surface. Using the collima-
tor lamp, check whether the detector is located in the radiation field
•
Set the SID according to the information given in the operating instructions for the kV
meter.
MOBILETT Plus/ -E/ -M
If the MOBILETT is equipped with a DAP measuring system, re-
move the DAP ionization chamber first.
Increased filtration leads to higher kV values.
The actual filtration of MOBILETT can be taken from the test proto-
col.
If the actual inherent filtration is not known, make the
correction with a value of 5 mm AI.
SPR8-215.831.04.03.02
07.05
Inspection and maintenance
Page 42 of 64
CS PS 24
(Fig. 21 / p. 42).
Siemens AG
Medical Solutions