GE SENOGRAPHE DMR+ Technical Publications page 95

GE Medical Systems
REV1
2–1–6 Line Conditioner Resonance Frequency
2–1–7 Generator Power (excluding tube)
2–1–8 Maximum Tolerance of Displayed Constants (with and without AEC or AOP)
M:
M1 = "0.6 kV "1.5%
M4 = "0.1 mAs "2.6%
M1' =
M4' =
2–1–9 Measurement Conditions
D
The generator can supply a maximum of 100 W to the tube.
This example represents one 30 kV/200mAs exposure each minute.
D
20 kHz approx.
D
5 kW maximum.
D kV: "2% + M1+M1'
D mAs: "5% "1 mAs + M4 + M4'
accuracy of the instruments used for the test.
Dynalizer accuracy in cathode to ground configuration
Dynalizer accuracy
Accuracy of the measuring device
Accuracy of the measuring device
D
kVp: Connect a voltage divider such as the Machlett Dynalizer in
series with the x-ray tube and measure the voltage with an
oscilloscope,
D
mAs: Use a waveform analyzer such as the Tektronic 7854, connected
in series with the x-ray tube. The oscilloscope receives a signal
proportional to the high voltage applied to the tube. The mAs
values are given by:
Where T1 is the time at which the high voltage reaches 75% of
its maximum value, and
T2 is the time at which the high voltage returns to 75% of the
maximum value.
4-7
T2
mAs = i dt
T1
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