Chapter 9
Page no. 1674
JC-CAL-A-012.fm
GE Healthcare
Senographe DS
Revision 1
Service Information and Procedures Class A 2385072-16-8EN
Job Card CAL A012 - X-Ray Tube Heater Current
6-1
Preparation
•
Place the Detector Protection Plate on the top of the image receptor to protect the detector panel
from excessive X-ray doses.
6-2
Calibration procedure
1. From the X-ray Console, select:
SETUP/GENE/INSTAL/GENE/GENE/TUBE/HEATER/
focal size
/
track
/CALIB
.
Perform the calibration procedure first on the
LF/MO
focal size/track combination.
CAUTION
Before proceeding to make exposures, be sure that the detector panel has been protected
from excessive X–ray doses as instructed (by placing a steel cover on the image receptor).
2. Press the Exposure button
on the X-ray Console and hold it down. The messages
EXPOSURE
NO 1
,
EXPOSURE NO 2
,
EXPOSURE NO 3
, and
CALIBRATION END
appear in sequence on the X-
ray Console display. The software automatically performs the three exposures and the calculations.
Note:
- Calibration time varies according to tube temperature. The message
TOO WARM
appears on the
X-ray Console display when tube temperature is too high for taking the next exposure. It is not nec-
essary to hold the Exposure button
down while waiting for the tube to cool. However, do not
exit the calibration menu while waiting. As soon as the
TOO WARM
message disappears, continue
the calibration by pressing and holding the Exposure button
.
- In case of arcing, the software re-attempts the same exposure automatically.
- The calibration procedure includes an exposure at 40 kV. If for some reason this exposure is
impossible to perform (e.g. excessive arcing), tube warm-up may be necessary.
3. Repeat steps 1 and 2 for LF/Rh.
4. Perform a checksum (
SETUP/SETUP/SETUP/SETUP/SETUP/SETUP/CKSUM/CKSUM
).
5. Exit the Calibration Menu (
SETUP/SETUP/SETUP/SETUP/SETUP
).
6. Plug in the Mag Stand or the Magstand Simulator to automatically select the small focus.
Note:
Do not select the small focus from the X-ray Console. Doing so will cause an "out of order" mes-
sage.
Note:
Even if the Senographe system is not delivered with the Mag Stands, you must still perform all of
the Small Focus (Mag Mode) calibrations listed below. This is because the Magnification Option
Installation Manual does not include a Job Card to perform the calibration of the X-ray Tube Heater
Current in Mag Mode.
7. Repeat steps 1 and 2 for SF/Mo.
8. Repeat steps 1 and 2 for SF/Rh.
9. Perform a checksum (
SETUP/SETUP/SETUP/SETUP/SETUP/SETUP/CKSUM/CKSUM
).
10. Exit the Calibration Menu (
SETUP/SETUP/SETUP/SETUP/SETUP
).
11. Carry out the following steps only if the warning message
Limited Ich
(limited heater current) appears
on the X-ray Console at the end of the tube current calibration. This message indicates that one or
more filament heating current values were calculated above 5.6 A (but internally limited to 5.600 A
when stored in memory). The message is only a warning and is not associated with an error code.
Proceed as follows:
