TXR 425 - Selecting Radiographic Parameters

Standard Frequency Series Generators
Operation
10
M-2008-7-14
3.1.3 MILLIAMPERE AND FOCAL SPOT SELECTION
Select up to seven x-ray Tube Current in milliamperes before choosing kVp or a time station because a
change in the mA station will also change the kVp meter reading, which in turn will also change the actual kVp
potential at the X-Ray Tube. When the mA is selected for a view the focal spot is automatically selected.
The focal spot is automatically selected according to the mA Station.
The mA selections are limited by tube type which is congured by the
eld engineer during the installation.
The Focal Spot change can be done whenever the present conditions
of the X-ray Tube allow it.
3.1.4 KILOVOLT SELECTION
Using Major and Minor knobs select the required kVp for the radiographic technique. Turn both knobs
clockwise to increase and counterclockwise to decrease kilovoltage. Approximately 1 kVp Minor and 10 kVp
Major increments may be select between 50 and 125 kVp.
Never change kVp during an Exposure.
3.1.5 TIME SELECTION
The timer is a digital timing circuit that has a range of .008s to 6.0s (1/120 second to 6 seconds) in 23
approximategeometricprogressivesteps.Dependingonthemodel,thetimerisprogrammedforspecicX-ray
Tube Limits. CAUTION: If the mA Test meter or exposure indicator should read past normal time of selected
time,quicklythrowthe“EMERGENCYOFFSWITCH”andnotifyqualiedX-RayServicePersonnel.
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