Tektronix H600 RFHawk, Service Manual

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Theory of Operation
Touch Screen The 8-wire, 10.4 in, resistive touch-screen module provides a touch-based access
to the graphical user interface. It functionally replaces a mouse for Windows
navigation, substituting point and click with a touch. The touch screen has an
anti-re
fl ective coating that reduces glare when the platform is used outdoors.
LCD Controls Backlighting is used for indoor viewing, and a combination of backlighting and
ambient light is used for outdoor viewing. To control brightness, use the soft keys
available on the Control Panel (
Start > Settings > Control Panel > Backlight ),
or double tap the backlight icon (lower-right corner of display).
Backlighting is continuously adjustable, with the default level set to 66%. The
backlight is extinguished during screen saver, suspend, and power down modes.
Processor System The instrument processor architecture is similar to that of a handheld PC with the
following exceptions:
640 x 480 TFT color display
8-wire touch screen
SPI bus
SMBus battery interface that supports two rechargeable battery packs
Expanded power management system
USB slave/host ports
Dual PCMCIA ports standard
PS/2 keyboard port
Flash fi le system ROM for optional software and system backup
Automatic Windows CE registry restoration during cold boot up
Instrument module power management system and additional power supplies
Foreign language support
Network support
Processor Bus. The PXA255 processor external bus width is 32 bits and operates
at 100 MHz.
Temperature Sensor.
The Processor board has an internal temperature sensor to
monitor the temperature of the platform.
Real-time Clock.
The Processor board real-time clock operates from a separate
Lithium coin cell battery. The battery life expectancy is 7 years.
2–2 H600 & SA2600 Service Manual