GE Healthcare Senographe DS
Revision 1 Service Information and Procedures Class A 2385072-16-8EN
Job Card CAL A012 - X-Ray Tube Heater Current
Page no. 1673 Chapter 9
JC-CAL-A-012.fm
Job Card CAL A012 - X-Ray Tube Heater Current Chapter 9
1SUPPLIES
None
2TOOLS
• Detector Protection Plate
• Set of acrylic plates
• Meter for measurement of mA. The meter must be in good condition and possess valid certification.
Suitable meters are:
- Fluke 87 multimeter
- Keithley 35035 mAs meter
- GS Poner 165 mA-mAs meter
3 REQUIRED EFFORT
Personnel: 1 Field Engineer
Time: 40 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
The Generator covers must be removed for access to the kV/mA board 701-PL1 on the HV tank unit.
Refer to Job Card PHY A042 - Remove/Reinstall Generator Covers on page 513.
6 CALIBRATION OF X-RAY TUBE HEATER CURRENT
The objective is to determine the X-ray tube heater current required to produce the desired X-ray tube
anode current at a given kV value.
The calibration procedure must be performed on each of the four focal size/track combinations. Four
repetitions of the calibration procedure are therefore necessary.
Three exposures are taken automatically at different kV values. Using the results, the software calcu-
lates the necessary parameters to determine the X-ray tube heater current needed to produce the
desired X-ray tube anode current for all possible kV values.
!
Notice:
In some situations, usually after a tube has been unused for a long period, excessive arcing may
make it impossible to carry out the procedures described in this Job Card. A warm-up procedure
to correct the problem is described in Job Card CAL A007 - Automatic X-ray Tube Warm-Up on
page 1661.
• Mag Stand (or Magstand simulator)
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