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Theory of Operation
2-2
DPO4000 Series Service M anual
Power Supply
The power supply converts AC line voltage to +12V to power all internal
circuits.
I/O Board
The I/O board contains USB ports, Compact Flash port, an Ethernet connector,
TekLink, XGA Video, and a Trigger Out port.
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 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
are 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 XGA display module (LCD).
Acquisition System
Trigger System
Display System