Block-Level Theory - Agilent Technologies Infiniium 90000 A Service Manual

Theory of Operation
This Service Guide supports troubleshooting the Agilent Technologies oscilloscopes to
assembly level. Theory of operation is included only as supplemental information. It is
not comprehensive enough for component-level troubleshooting.

Block-Level Theory

The front panel provides:
• Dedicated knobs and pushbuttons for major oscilloscope functions.
• An 12.1 inch (diagonal) color flat panel display for waveform, measurement, and graphical
interface display.
• Three front panel USB 2.0 ports.
• Precision BNC connectors for channel input signals.
• BNC connector for auxiliary output signal.
• AutoProbe interface for probe power and probe control.
• A connection for probe compensation.
The rear panel provides several connections:
• The line power input.
• 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.
The major boards of the oscilloscope are the backplane board and the two acquisition boards
(there are several additional minor boards). Figure 7-2 shows the physical layout of the backplane
and acquisition boards. The boards are part of a PC system complete with an ATX motherboard,
power supply, and LCD display.
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