Appendix D Calibration (Using Generator Service Tools)
HF Series X-ray Generators - Service Manual Revision W
Quantum Medical Imaging, LLC D-41
ing slider to the right; if waveform is Too High, decrease the filament
preheat value by moving slider to the left.
Note: Only a small amount of adjustment may be
necessary, make all adjustments in small incre-
ments at a time.
13. Press the Repeat button.
14. Re-take the exposure and adjust preheat value if necessary. Repeat
this step until mA preheat is optimized. Press Complete button
when finished. Confirm optimization using a secondary calibrated mA
measurement instrument such as Dynalyzer or mAs meter.
MA Calibration Tab
This procedure calibrates the generator to verify accurate system measure-
ment of tube current (mA). Current measurement accuracy is verified using a
pre-calibrated mAs meter (Dynalyzer or equivalent) as a benchmark. Ensure
precision of the measurement instrument is sufficient enough to assure gen-
erator accuracy requirements can be met.
An oscilloscope may be used for mA measurement, however, it likely will not
be precise enough to assure generator mA accuracy. To use an oscilloscope
for mA measurement, connect scope leads between test point TP7 on KVP
Control Board A2 (AY40-003S1) and ground. Set scope for 1.0 volt/division,
and 50 ms/division time base. This will give a 100 mA/volt equivalent for mA
measurement (see Figure D-26 for sample mA measurements using scope).
Figure D-26. MA Measurement Using an Oscilloscope
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