Keysight Technologies Infiniium 90000A Series, Service Manual

Page: 133 / 136

Theory of Operation
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90000 A-Series Service Guide 133
• A GPIB connector, for connection to an oscilloscope controller (optional)
• An RS-232 connection
• A parallel printer connection
• XGA monitor connection
• Mouse and keyboard connections
• LAN 10/1000 connection
• Auxiliary Trigger Input BNC
• 10 MHz Reference Output BNC
• 10 MHz Reference Input BNC
• TTL trigger output BNC
• Four rear panel USB 2.0 ports
Display Board
The display board controls the flat-panel display monitor. It translates the video
signals from the motherboard’s on-board video system to the Low Voltage
Differential Signal (LVDS) signals that drive the monitor.
On/Off Board
The On/Off board interfaces with the motherboard to provide the on-off switch
function and the backplane to provide the probe compensation output. Power
indicator LEDs backlight the on-off pushbutton and are driven by the
motherboard. The probe compensation lugs connect to the calibrator output on
the backplane through an SMB connector coax cable. An ESD protection diode
sits on the On-Off board, connecting the signal and ground probe compensation
lugs.
Main FPGA
The main FPGA is the only communication link from the oscilloscope hardware to
the PC system. All system controls and data must pass through the main FPGA. It
contains a number of registers that can be used to control peripherals, configure,
and communicate with other FPGAs, and pass sampled data to the PC. shows the