Siemens AG
SPB7-250.831.01.02.02
MAMMOMAT Novation
08.04
CS SD 24
Test exposures
25
Page 25 of 32
Medical Solutions
5.2
BIAS voltage check
PMF
The BIAS voltage settings shall be checked.
Required equipment
Voltmeter with sharp probes, a small screwdriver, a compression plate simulator, and a
magnification table.
Required documents
Calibration data for the x-ray tube (found on a note called “prüfprotokoll” in the MAMMO-
MAT Novation
DR
Technical Manual).
Procedure
•
Turn ON the main power supply to switch the detector ON. Allow a detector warm-up
time of 1 hour.
The detector should be powered on at least 1 hour before intended use. If it is used
sooner than 1 hour after being powered on, image quality can be affected.
•
Press button
on the control panel to turn the MAMMOMAT ON. Allow a warm-up
time of approximately 5 minutes. The internal monitoring system automatically per-
forms a functional check of the MAMMOMAT. “dr” is displayed on the film density dis-
play on the control panel to indicate that communication within the MAMMOMAT
Novation
DR
system is functioning.
•
Attach a magnification table so that small focus is selected.
It does not matter if a 1.5x or 1.8x magnification is selected.
•
Mount a compression plate simulator.
•
Select Mo anode on the control panel. Measure the voltage for the Mo anode at connec-
tor X726 on the tube power supply between pin 1 (BIAS_VOLTAGE) and pin 6 (0V).
The measured voltage(s) must correspond to (tol 1V) the calibration data for
the X-ray tube. If this is not the case, adjust the "Bias Mo" potentiometer until the volt-
age corresponds to the calibration data (tol 1V).
•
Perform the same procedure as in step
2
with W and adjust the "Bias W" potentiometer.
