Theory of Operation
Display Panel
The active-mat
rix LCD display is fully controlled by Windows drivers. The
display has a 1024 x 768 resolution and brightness is set to full intensity.
For AWG7000C S
eries instruments, the display is controlled by the Processor
board. For AWG7000B Series instruments, the display is controlled by the MIO
board (or the display adapter board on AWG7000B Series instruments with serial
numbers B020000 and above).
Touch Pan el
The touch information from the touch screen is processed by Windows drivers,
actively placing the pointer at the touched location. Actions from the mouse
and the touch panel are interchangeable, a nd treated alike by the user interface
software. The AccuTouch resistive touch screen uses a glass panel with a uniform
resistive coating. A thick polyester coversheet is tightly suspended over the top of
aglasss
ubstrate, separated by small, transparent insulating dots. The coversheet
has a hard, durable coating on the outer side and a conductive coating on the inner
side. The controller is located on the LCDA board.
Processor (μATX) Board
The μAT
X board provides standard Windows functionality and I/O port interfaces
on the rear panel. This includes RS-232, Parallel, and Ethernet ports, as well as
four USB ports, plus two USB2.0 ports located in the lower right front corner
of the instrument. The μATX board receives input from the front panel and
touch panel, and implements the appropriate changes. For AWG7000C Series
instruments, video display data is transferred through the LVDS connector. For
AWG
7000B Series instruments, video display data is transferred through PCI bus
interface. The hard drive is connected to the μATX board through the SATA
interface, and the CD/DVD is connected to the Windows system through the
IDE parallel interface.
The CD/DVD drive is connected to the Windows via an interface connector on
the μATX board. AWG7000C Series models connect using the SATA interface.
AWG7000B Series models connect using the IDE parallel interface.
Power Supply
The power supply CVR460 is a switching AC to DC converter. It automatically
detects the line voltage over the range of 90 to 264 VAC. It supplies power to all
the circuitry in the instrument. No switch completely disconnects the line power
from the instrument. T he ON/STBY switch controls the power to the instrument
through the μATX board circuitry. When in the “power off” condition, there is still
a low power standby current to allow the system to monitor the ON/STBY switch.
Fans
Three fans o n the side of the instrument provide forced air cooling. The fans are
controlled by the fan speed control circuit on the PWR board and are regulated by
monitoring the temperature at the circuitry.
2–6 AWG7000B and AWG7000C Series Service Manual
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