GE Healthcare Senographe DS
Revision 1 Service Information and Procedures Class A 2385072-16-8EN
Job Card CAL A011 - Calibration of kV Scale Factor
Page no. 1667 Chapter 9
JC-CAL-A-011.fm
Job Card CAL A011 - Calibration of kV Scale Factor Chapter 9
1SUPPLIES
None
2TOOLS
• kVp meter. The kVp meter must be in good condition and possess valid certification.
Suitable meters are:
- Radcal 4083 kVp meter (requires use of acrylic plates)
- RMI 232 kVp meter
- Keithley 35080B kVp meter
Note:
The calibration curve attached to the meter (obtained during periodic recalibration of the meter)
must be used to correct the meter reading throughout this procedure.
Note:
The Keithley 35080B kVp meter is not recommended for use in Europe
It does not meet the European accuracy requirement of 3%.
• Standard 19 X 23 Compression Paddle for positioning the kVp meter close to the Tube Head
• Detector Protection Plate (used to protect the detector from the possibility of falling objects)
• Radiation Protection Plate (used to protect the detector from excessive exposure to X-rays)
3 REQUIRED EFFORT
Personnel: 1 Field Engineer
Time: 30 minutes
4 SAFETY PRECAUTIONS
The procedures in this Job Card produce X-rays. Ensure that you take appropriate precautions when
operating with X-rays (for example, stay behind the radiation screen during an X-ray exposure).
5 PREREQUISITES
None
6 CALIBRATION OF KV SCALE FACTOR
The objective is to determine the scale factor G and offset VOF between the X-ray tube kV command
from the software and the real kV value obtained.
DEFAULT PARAMETER VALUES ARE G = +6.554E+1 (65.54) and VOF = +0.000E+0 (0.0)
CAUTION
DO NOT touch potentiometer P1 on generator kV/mA board 701-PL1 at any point in this
Procedure.
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