9600 Service Manual - gmecorp-usa.com

Image System 39
ABS
OVERVIEW
The Auto Brightness System (ABS) is a combination of software and hardware that
automatically adjusts kVp, mA, and camera gain for an optimal image. An analog
voltage from the camera (VIDEO_ LEVEL) is digitized and compared to a reference
level in the ABS software. If VIDEO_LEVEL does not equal the reference voltage, the
ABS tables located in software are used to regulate kV, mA, and camera gain until it
matches. The functions adjusted are dependent on the Fluoro mode selected as shown
in Tables 10 through 13.
ABS TABLE SELECTION CONTROL
Various ABS tables reside in software, but their availability for selection at the control
panel must be setup in system configuration files. Refer to the C-Arm Software section
in this manual for details of system configuration.
The operator selects the desired ABS table by pressing the “ABS SELECT” control on
the C-Arm control panel (see Figure 23 below). When the control is pressed, the current
ABS table will be displayed for 2 seconds on the control panel display. The other tables
are displayed if the control is pressed again during the two seconds. If the control is not
pressed again, the ABS table that is displayed will be loaded for use if not already
active.
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Figure 23 - ABS Table Selection Control on the C-Arm Control Panel