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-
and
Job Card CAL A012 - X-Ray Tube Heater Current
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
, 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
