GE Healthcare Senographe DS
Revision 1 Service Information and Procedures Class A 2385072-16-8EN
Job Card CHK A013 - Check mA and mAs settings
Page no. 1757 Chapter 9
JC-CHK-A-013.fm
6-2 Check mA displayed on the X-ray Console
1. Go to the medical application and use the parameters shown in the following table to make an expo-
sure.
2. Note the Nominal mA value (N) displayed on the X-ray Console, and the Measured mA value (M) on
the meter. Calculate the values N +5% and N -5%.
3. For the check to pass, the Measured mA value (M) must be within ±5% of the Nominal mA value (N).
4. If the check fails, perform the calibrations described in Job Card CAL A009 - X-Ray Tube mA Mea-
surement on page 1663 and Job Card CAL A012 - X-Ray Tube Heater Current on page 1673.
6-3 Check mA calibration
1. Make four exposures, using the parameters shown in the following table.
2. For each exposure, note the Measured mA value (M) on the meter.
3. For the check to pass, each Measured mA value (M) must be within ±5% of the corresponding
Expected Nominal mA value shown (N).
4. If the check fails, there is a system error which must be corrected.
6-4 Check mAs calibration
1. Follow the instructions of section 6-1 Preparation, but this time connect an mAs meter in place of the
milliammeter.
2. Use the parameters shown in the following table to make an exposure.
3. Note the meter reading Measured mAs.
4. For the check to pass, the meter reading Measured mAs must be between the Lower and Upper lim-
its shown.
5. If the check fails, there is a system error which must be corrected.
Filter/Track/
Focal spot
kV Selected
mAs
Nominal mA
(N) on Console
Measured
mA (M)
N+5% N-5% Test result
Pass/Fail
Mo/Mo/LF 30 100
Filter/Track/
Focal spot
kV Selected
mAs
Measured
mA (M)
Expected Nominal mA (N) Test result
Pass/Fail
N-5% N N+5%
Mo/Mo/LF 30 63 95 100 105
Mo/Mo/SF 30 63 38 40 42
Rh/Rh/LF 30 63 58.9 62 65.1
Rh/Rh/SF 30 63 33.25 35 36.75
Filter/Track/
Focal spot
kV Selected
mAs
Measured
mAs
Lower limit
(63 mAs -5%)
Upper limit
(63 mAs +5%)
Test result
Pass/Fail
Mo/Mo/LF 30 63 59.9 66.2
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