Chapter 8: Theory of Operation
Block-Level Theory
151
Motherboard
The motherboard provides all system control and interface functions for the oscilloscope. It
contains a CPU, ROM, and RAM; keyboard and mouse interfaces, serial and parallel interfaces,
CDROM, hard disk drive interface, PCI (Peripheral Component Interconnect) buses, and a x1
PCI Express bus connector.
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 FPD monitor. The display board also provides +12 V to the backlight inverter.
Probe Power and Control
The Probe Power and Control board provides filtered, regulated power to the front-panel
AutoProbe interface. It also provides serial communications capability, offset and probe
detection and identification circuitry. All of these are interfaced to the probe through the
conductive pads surrounding the BNC connectors. Using the facilities of this board, the
Autoprobe interface can supply power for active probes, notify the oscilloscope operating system
when a probe is connected or disconnected, identify the probe type to the oscilloscope operating
system for automatic configuration, and communicate with the probe to support advanced probe
functionality.
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