HF Series Generators
Maintenance
MA-1004R4
15
5. Make an exposure without film in the cassette and note the Exposure
Time displayed on the Console, it should be approximately 100 ms. If
necessary, change the Copper thickness (or if needed change the mA
station) and make the exposure again.
6. Insert a cassette with the Medium Film/Screen combination used by the
customer. Make an exposure, develop the film and check the Optical
Density, it should be 1.0 (or the customer preference O. Density).
7. If the Optical Density is not as required, perform the respective AEC
Calibration procedure.
8. Repeat the above steps for all the Ion Chambers installed with the
Generator.
2.9.2 kV COMPENSATION
1. Select a workstation for the Ion Chamber to be tested. Select on the
Console:
G RAD Menu: 55 kV, 200 mA Large Focus (or the first mA station for
Large Focus if 200 mA station is set for Small Focus) and 1 second
back-up time.
G AEC Menu: “Central Area”,“Density 0” and “Medium
Film/Screen”.
2. Make an exposure w ithout film in the cassette and check that the
Exposure Time is lower than 1 second. If necessary for that, change the
Copper thickness (or if needed change the mA station) and make the
exposure again. Take note of the final Copper thickness and mA station
selected for 55 kV.
3. Select 90 kV. Make an exposure without film in the cassette and check
that the Exposure Time is higher than 20 ms. If necessary for that, change
the Copper thickness (or if needed change the mA station) and make the
exposure again. Take note of the final Copper thickness and mA station
selected for 90 kV.
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