Theory of Operation
Display Panel
Waveforms and m
enus are displayed on a color, active-matrix LCD display with
touch panel.
Display System. Text and menu image information from the Windows system is
merged with the waveform images and processed by the display circuitry. The
display system sends the combined graphical image to the active-matrix LCD
display.
Touch Panel. The touch information from the touch screen is processed by a
Windows driver, actively placing the pointer at the touched location. Actions from
a mouse and actions from the touch panel are interchangeable, and treated alike
by the user interface software.
Front Pan
el
Front-panel push-button and knob encoder switches are read by an embedded
micro controller, which sends the button and knob change information to the
Windows system over the Universal Serial Bus path.
ON/STBY. The ON/STBY switch in the lower left corner of the instrument front is
connected directly to the μATX board which, in turn, controls the off-line power
supply system. This allows Windows to control the power based on standard
Windows operating behavior.
μATX Board
The μATX board provides standard Windows f unctionality and I/O port interfaces
onasideorrearpanel.ThisincludesRS-232, Centronics, and Ethernet ports, as
well as four USB ports, including a USB2.0 port placed in the lower right corner
of the instrument front.
The μATX board receives input from the Front Panel and Touch Panel, and
implements the appropriate changes. Video display data, containing waveform
a
nd graphical menu information, is transferred to the Windows system through
the PCIe bus interface.
T
he hard drive is connected to the μATX board through the SATA interface, w hile
the CD/DVD is connected to the Windows system through the IDE parallel
interface. The hard drive and CD provide access to stored waveform data and
software to customize y our instrument with your measurement needs.
Interface Board
This board coordinates the flow of data through the Windows PCI port from the
various devices that communicate with the μATX system. The devices include the
display system, GPIB, TekLink, and a direct DMA path to the acquisition system.
The GPIB permits external control of the instrument both as a controller and
as a slave device.
The acquisition system analog power supplies are generated on this interface
board, from DC voltages supplied by the off-line power supply unit.
2–2 MSO70000/C, DSA70000B/C, DPO70000B/C, DPO7000, MSO5000, DPO5000 Series
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