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Theory of Operation
3–2
TDS3000 Series Service Manual
Battery Board
The battery board provides the following functions:
Interfaces to the optional battery pack (powers the oscilloscope from the
battery pack or charges the battery pack when the oscilloscope is connected
to AC line).
Turns on AC power to the oscilloscope.
Converts 15 VDC from the power supply to 5 VDC for the main and front
panel boards and ±15 VDC for probe power.
Powers the cooling fan.
Routes 15 VDC from the power supply to the external power connector for
powering external devices.
Main Board
The Main Board module contains the following functions.
The acquisition system begins with the analog signal path and ends with a
digitized signal in memory. The signal enters a channel input and then passes
through an attenuator and preamplifier. The analog signal from each preamplifier
goes through a sampler and digitizer, a time base controller, and then into
acquisition memory. The analog signal from each preamplifier is also distributed
to a trigger circuit.
The trigger system processes the analog signals from the preamplifiers and sends
trigger information to the time base controller. Advanced trigger functions are
enabled only when the appropriate application modules and supporting software
is installed.
The display system combines live waveform data from acquisition memory with
menus and text and stores this information in display memory. It then uses this
data to refresh the VGA display module (LCD).
The processor system contains a MPC680DC Power PC microprocessor that
controls the entire instrument. The processor system also contains flash ROM,
system RAM, and interfaces to communication modules, the parallel printer port,
and the floppy disk drive.
Acquisition System
Trigger System
Display System
Processor System