LORAD AFFINITY Series - Performance Test - Small Spot (Rh)

4-26 P/N 9-500-0255
Service Manual
Chapter 4: Calibrations and Performance Checks
Automatic Exposure Control System Calibration
Note… Do not readjust Gain or Offset at 26 kV (initial calibration).
Table 4-8: AEC Performance Worksheet—Small Focal Spot, Mo Filter
5.15 Performance Test - Small Spot (Rh)
This procedure ensures that the AEC system consistently produces films at the required
optical density (within 0.15 OD) using the Rh filter, small focus.
1. Select the Rhodium filter. Enter the values for Gain, Offset and AEC Density obtained for
the Mo filter as the starting values for the Rh filter (refer to Table 4-9: AEC Performance
Worksheet—Small Focal Spot, Rh Filter).
2. Make Rh filtered exposures at 28 through 32 kV. Check the optical density of each film
to ensure that it is within ±0.15 OD of the mean optical density.
3. If necessary, make Gain and Offset adjustments. Use absorber thicknesses to make Gain
adjustments between 7 mAs and 10 mAs. Use absorber thicknesses to make Offset
adjustments between 70 mAs and 100 mAs.
Small Focal Spot
0.030 mm Molybdenum Filter
Mag Table/Paddle/BR-12
KODAK MIN-R-2000 Film/
Cassette
Gain - Lower Thickness = 6 to
14 mAs
Offset - Higher Thickness = 65
to 130 mAs
kV mA Recommended
Thickness
mAs OD Gain/Offset Max/-1 cm mAs OD
24 28 1.5 cm G=
3.5 cm
24 28 4.5 cm O=
25 30 2.0 cm G=
3.5 cm
25 30 4.5 cm O=
26 30 2.0 cm G=
4.0 cm
26 30 5.0 cm O=
27 30 2.5 cm G=
4.5 cm
27 30 5.5 cm O=
28 30 2.5 cm G=
5.0 cm
28 30 6.0 cm O=
29 30 3.0 cm G=
5.5 cm
29 30 6.5 cm O=
30 30 3.0 cm G=
5.5 cm
30 30 6.5 cm O=
31 30 3.5 cm G=
6.0 cm
31 30 7.0 cm O=
32 30 3.5 cm G=
6.5 cm
32 30 7.5 cm O=
Note… Adjust thickness as necessary to achieve desired results.