Chapter 4 Theory of Operation
HF Series X-ray Generators - Service Manual Revision W
Quantum Medical Imaging 4-19
The adjustment potentiometers functionality:
Table 4-1. Universal AEC Board Ion Chamber Adjustments
Table Ion Chamber Type
Slope Level
dV/dt adjustment:
A11R87 - Adjust once for either
the table or wall ion chamber
(both must be "slope" type ion
chambers)
Ion chamber output balance:
A11R61 - Field 1 (Center),
A11R63 - Field 2 (Left)*,
A11R66 - Field 3 (Right)*
dv/dt adjustment:
A11R82 - Adjust once for
either table or wall ion cham-
ber (both must be "level" type
ion chambers)
Fine gain adjustment:
A11R77 - table ion chamber
gain adjustment
All other potentiometers are
for future use.
Wall Ion Chamber Type
Slope Level
dV/dt adjustment:
A11R87 - Adjust once for either
the table or wall ion chamber
(both must be "slope" type ion
chambers)
Ion chamber output balance:
A11R61 - Field 1 (Center),
A11R63 - Field 2 (Left)*,
A11R66 - Field 3 (Right)*
dv/dt adjustment:
A11R82 - Adjust once for
either table or wall ion cham-
ber (both must be "level" type
ion chambers)
Fine gain adjustment:
A11R79 - wall ion chamber
gain adjustment
All other potentiometers are
for future use.
*Note: Settings indicated are for right hand load side; for left hand load, use
A11R63 to adjust right field and A11R66 for left field.
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