HF Series Generators
Maintenance
MA-1004R4
18
4. The Fluoro mA values are obtained by measuring the average mA using
a mA meter in Fluoro.
During Fluoro exposure, mA values are read directly with a mA Meter in
DC connected to the mA Test Points (banana plug connections) on the
HV Transformer. Only for this purpose, remove the link between the
banana plug connections on the HV Transformer.
5. For testing the mA, make a Fluoro exposure at 50 kV, 80 kV and 110 kV.
Check that the mA values read on the mAs Meter must be the same mA
displayed on the Console with a tolerance of ±10 % mA. If the mA value
does not comply with the above values, perform the respective
Calibration procedures.
6. Remove the Dosimeter and the Lead Apron (Blocker).
2.11 ABC CHECK
If the Generator is interfaced with an ATS Image System, ABC
testing procedure has to be performed as explained in the Image
System documentation.
1. Be sure that the Video System and the Image Intensifier are powered and
operating correctly.
2. Set up a Dosimeter as close as possible to the Image Intensifier
Radiation Input to measure the Entrance Image Intensifier Exposure
Dose Rate. Position the Probe at the center of the primary beam with the
entire active volume w ithin the primary beam.
Place the Tube-Collimator Assembly at the normal SID (1 meter), fully
open the Collimator Blades and align the Image Intensifier with the light
beam.
3. Adjust TV Camera gain for 1 volt peak-to-peak composite video output.
Note .
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