9600 Service Manual - gmecorp-usa.com

24 C-Arm Control
A/D SECTION
The A/D section is comprised of sample mux U3, sample/hold IC U8, and analog
to digital converter U7(AD573). Sixteen A/D inputs (0-10 VDC) are monitored by
the Technique Processor CPU. The analog output of MUX U3 whose is fed to U8
which holds the level for digitization by U7, a 10 bit A/D converter. Refer to
Figure 11.
The Technique Processor then stores this digitized data value in its DUAL PORT
RAM (U31) for each analog MUX input signal, shown below. Sample MUX U3 is
addressed by the AMUXSEL lines generated by sequencing circuits on the
Technique Processor PCB. Analog Mulitplexer (U3) input pin assignments are
listed below in Table 1. Refer to the C-Arm Software section in this manual for
typical results of these signals using the Control Panel Status software.
SOFTWARE
CHANNEL & PIN
SIGNAL FUNCTION SOURCE
Channel 0 - Pin 19 KVPMEAS kV measure for high voltage Tank (1:10,000)
servo 1 volt/20kV nominal Capacitive Sense
Channel 1 - Pin 20 MASNS & mA measure for tube current Tank
MASNSRE servo
100 Turn Anode Sense
F
FLUORO = 125 mV/mA (±3%)
FILM = 6.25 mV/mA (±3%)
Winding
Channel 2 - Pin 21 FILSNS Filament B+ Sense
Generator Driver PCB
“Regulator Fail” if this voltage
incorrect
(via R42) P2 pin 11
Channel 3 - Pin 22 VLI Video Level Indicator; ABS &
Camera Gain satisfy this signal
for tracking
Camera Assy.
Channel 4 - Pin 23 HOUSTEM Housing Temperature
X-ray Tube Assy.
P
(Thermistor)
Channel 5 - Pin 24 DOSIMTR not used ---------------
Channel 6 - Pin 25 CAMROT Camera Rotation Indicator Potentiometer on CCD
camera
Channel 7 - Pin 26 AD_SPARE not used ---------------
Channel 8 - Pin 11 SECTAPV Redundant kV Sense for Tank
software
1 Turn Windings
≅0.22 volts (± 0.02 volts)/kVp (1:4,300)
Channel 9 - Pin 10 LINE_SNS Line Voltage Sensing Battery Charger PCB
Channel 10 - Pin 9 CHGR_I Charger Current Sense Charger via Generator
Driver PCB
Channel 11 - Pin 8 200V_SNS Battery Voltage Sense Charger via Generator
Driver PCB
Channel 12 - Pin 7 ADSPARE1 not used ---------------
Channel 13 - Pin 6 ADSPARE2 not used ---------------
Channel 14 - Pin 5 --------------- not used ---------------
Channel 15 - Pin 4 --------------- not used ---------------
Table 1 - Inputs to A/D Section