APX 525/625 Generator Revision C Service Adjustments
©
2005 Del Medical Imaging Corporation
7/5/2005 Page 146
mAs Adjustment - Alternate Method without Dynalyzer™
mAs has been pre-adjusted and verified at the factory. However, it may become
necessary to test or adjust mAs in the field. Del Medical Imaging recommends using
a Dynalyzer™ (or equivalent) for this measurement.
This procedure is to be used only when a Dynalyzer™ is not available.
mAs Calibration
1. With power off, place the mAs Regulator Board on the extender card.
2. Connect a mAs meter in series with the “MA+” lead, on the top of the high
voltage transformer. Ensure that the connections to the meter are secure.
Caution: Loose or open connections in the mA feedback circuit may result in the
presence of dangerously high voltages during exposures, and may also permanently
damage the x-ray tube.
Note: The current in this circuit is DC tube current. Although most mAs meters can
select either AC or DC measurement modes, the difference in results is negligible
when used in DC circuits.
3. Turn the generator ON.
4. Set the generator to:
Mode 2 Point
Focal Spot
Large
kV
84
mAs
50
5. Make exposures as necessary, adjusting Pot R2 on the mAs Regulator Board for
a reading on the mAs meter that matches the selected mAs (+
1 mAs).
6. Increase mAs to 500 mAs.
7. Make exposures as necessary, adjusting Pot R14 on the mAs Regulator Board
for a reading on the mAs meter that matches the selected mAs (+
1 mAs).
8. Turn the generator OFF.
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