HF Series Generators
Calibration
CA-1036R2
59
8. Make a Fluoro exposure at 70 kV and measure the radiation. Optimum
radiation is obtained by modifying the Fluoro kV or the Copper thickness
in the Collimator Filter Holder. First modify the Fluoro kV, if it is more than
80 kV or less than 60 kV modify the Copper thickness in 0.1 mm (or
0.2 mm). Note the value of Fluoro KV and Copper thickness used to
obtain the optimum radiation.
Radiation increases when kV is increased or Copper thickness is
reduced.
9. Perform the adjustment for the window test as specified on the TV
Camera manuals. This window defines the area of the image where the
brightness will be captured for the ABC and it should be the 25% of the
image area.
10. Select the 70 kV (or the kV obtained in step-8.) and Non-ABC mode.
11. Adjust R 29 (OFFSET) on the RF Adaptation Board to have 0 VDC in TP7.
12. Adjust gain at R27 (Gain) on the RF Adaptation Board to make the “ABC
OUT” signal equal to +6 VDC. Measure “ABC OUT”inTP-7ofRF
Adaptation Board o r in TP3 (”ABC IN”) of the AEC Control Board.
13. Perform the following adjustments in the AEC Control Board:
a. Select 70 kV (or the kV obtained in step-8.) and increase 2 kV and
check the increased value of voltage in TP3 (ABC-IN). Note this
value (consider it as KV-DOWN-SEL).
b. Select 70 kV (or the kV obtained in step-8.) and decrease 2 kV and
check the decreased value of voltage in TP3 (ABC-IN). Note this
value (consider it as KV-UP-SEL).
c. Obtain in TP1 the same voltage noted as kV-DOWN-SEL (DOWN
PT) by adjusting the Potentiometer R11.
d. Obtain in TP2 the same voltage noted as kV-UP-SEL (UP PT) by
adjusting the Potentiometer R14.
14. Select the 7 0 kV (or the kV obtained in step-8.) and ABC mode.
15. Make a Fluoro exposure and check that the kV does not change.
16. Stop the Fluoro exposure and select 40 kV. Make a Fluoro exposure and
check that the kV value goes to 70 kV (or the kV obtained in step-8.)
±2 kV w ithout System problems.
17. Stop the Fluoro exposure and select 100 kV. Make a Fluoro exposure
and check that the kV value goes to 70 kV (or the kV obtained in step-8.)
±2 kV w ithout System problems.
Note .
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