AMX−4+ OPERATION
GE MEDICAL SYSTEMS (MODEL 2169360, 2236420 & 2275938 SERIES)
REV 10 om 2166913−100
5−9
D Should you reach a maximum or minimum value, kVp / mAs MAX or kVp /
mAs MIN will briefly appear on the message display to alert you.
Important: Carefully check the digital display (see Illustration 5−9) before making
an exposure to ensure that the factors selected are those that are in-
tended. Pay particular attention to the placement of the decimal point in
the mAs setting to ensure that whole numbers are not mistaken for an in-
tended mAs fractional number.
D The kVp ranges from 50 to 125 kVp, in 24 steps:
50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 80, 85, 90, 95, 100, 105, 110,
115, 120 and 125.
D The mAs ranges from 0.40 to 320 mAs, in 30 steps:
0.4, 0.5, 0.64, 0.8, 1, 1.25, 1.6, 2, 2.5, 3.2, 4, 5, 6.40, 8, 10, 12.5, 16, 20, 25, 32,
40, 50, 64, 80, 100, 125, 160, 200, 250 and 320. Refer to the chart below for
maximum technique ratings.
Maximum kVp and mAs Ratings
kVp mAs
110 to 125 200
95 to 105 250
50 to 90 320
D It’s important to note that the kVp setting takes precedence over your mAs set-
ting. That is, if your technique would generate too much heat for the x−ray
tube anode, the mAs setting will automatically decrease to permit the se-
lected kVp.
For instance, if kVp is set at 110 then your maximum mAs will not exceed 200.
Note: The maximum allowable kVp and mAs ratings stated within this operation
manual and as allowed by the equipment, may appear to exceed the tube rat-
ings. (Reference Direction 46−017226, Tube Ratings HRT X−ray Tube 50 &
60 Hz or 2236721−100, Product Data Sheet Maxiray 75 TH 11 X−ray Tube).
The reason for this apparent discrepancy is that the tube rating charts in
Direction 46−017226 or Product Data Sheet 2236721−100 are based upon a
25% heated tube assembly (75% heat units remaining), while the actual maxi-
mum allowable kVp and mAs ratings are based upon a cold tube assembly.
The AMX−4+ generator contains a proprietary heat loading algorithm
which protects the tube assembly for all heat loading conditions.
FOR TRAINING PURPOSES ONLY!
NOTE: Once downloaded, this document is UNCONTROLLED, and therefore may not be the latest revision. Always confirm revision status against a validated source (ie CDL).
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