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
1
SUPPLIES
None
2
TOOLS
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Meter for measurement of mA. The meter must be in good condition and possess valid certification.
Suitable meters are:
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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
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
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