GE Healthcare
Senographe DS
Revision 1
Service Information and Procedures Class A 2385072-16-8EN
Job Card CAL A003 - X-Ray Tube Focal Bias Voltage Scale Factor
Page no. 1655
Chapter 9
JC-CAL-A-003.fm
Job Card CAL A003 - X-Ray Tube Focal Bias Voltage Scale Factor
Chapter 9
1
SUPPLIES
None
2
TOOLS
3
REQUIRED EFFORT
Personnel: 1 Field Engineer
Time: 67 minutes
4
SAFETY PRECAUTIONS
CAUTION
In case of equipment breakdown or service engineer error during this calibration proce-
dure, the resulting parameter values might become so unreasonable as to render the X-ray
tube focal bias voltage supply circuit unusable. This can show up as an error message
during power up, and thus inhibit use of the calibration software. If this happens, the only
way to cancel the error is to manually re-enter the default parameter values (see section 6
for these values) and switch the Senographe off and back on again before attempting to
repeat the calibration.
5
PREREQUISITES
None
6
CALIBRATION OF X-RAY TUBE BIAS VOLTAGE SCALE FACTOR
The objective is to determine the parameters I, J, K, L, M and N minimizing the difference between the X-
ray tube focal bias voltage command from the software and the real focal bias voltage value obtained.
The focal bias voltage applied to the X-ray tube electron beam concentration device establishes the focal
spot width.
DEFAULT PARAMETER VALUES ARE
-
I=0.000E+0
-
J=3.330E+2 (333)
-
K=8.440E+1 (84.4)
-
L=5.770E-2 (0.0577)
-
M=0.000E+0
-
N=4.260E+2 (426).
