Chapter 3 Calibration
Revision W HF Series X-ray Generators - Service Manual
3-68 Quantum Medical Imaging, LLC
AEC LINEARITY VERIFICATION (ONLY PERFORM ON UNITS EQUIPPED WITH QG-
AEC OPTION)
1. Set the Dynalyzer (or equivalent) for 75% trigger level on kVp. Ensure that
the meter is set to measure mR.
2. Place 10 CM of acrylic in the X-ray field, and set the generator Operator Con-
trol Panel to AEC mode, 50 kV (60kV if 150kV, max output Generator), Normal
Density.
3. Using Table 3-9, locate the model number of the generator and set the Oper-
ator Control Panel to the mA setting shown in "SAMPLE 1 mA" column (large
filament), then take 10 consecutive exposures recording the measured mR
and mAs values in AEC Linearity Data Table 3-13.
4. Set the Operator Control Panel to adjacent mA station (indicated in the "SAM-
PLE 2 mA" column of Table 3-9) and take 10 consecutive exposures recording
the measured mR and mAs values in AEC Linearity Data Table 3-13.
5. Calculate the linearity using the worksheet provided in Table 3-13, and con-
firm it meets the required limit (<0.1).
MAXIMUM DEVIATION: KVP, TIME, MA, MAS
1. Set the Dynalyzer (or equivalent) for 75% trigger level on kVp.
2. Refer to Table 3-14 and take exposures at the required settings and record
the measured values in the data sheet.
3. Verify the following are within tolerance:
NOTE
Time is measured
at 75% of the
peak kVp
waveform.
Exposure times
must be greater
than 100
milliseconds.
Accuracy Specifications
kVp Accuracy: kVp = ± ( 4.0% kV )
mA Accuracy: mA = ± ( 5.0% mA + 1 mA )
Time Accuracy:
mAs Accuracy:
mAs = ± ( 5.0% mAs + 0.5 mAs )
time = ± ( 2.0% time + 1 msec. )
time = ± ( 1.0% time + 1 msec. )
time = ± ( 0.5% time + 1 msec. )
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