Theory of Operation
2-2 DPO4000 Series Service Manual
Power Supply
The power supply convertsAC line voltage to +12V to power all internal
circuits.
I/O Board
The I/O boardcontains USB ports, C ompactFlash port, an Ethernet connector,
TekLink,XGA Video, and a Trigger Out port.
Main Board
The main boardmodule contains the following functions:
The acquisition systembegins with the analog signal path and ends with a
digitized signal in memory.The signal enters a channel input, and then passes
through an attenuatorand 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 distri buted to a trigger
circuit.
The trigger system processesthe analog signals from the preamplifiers and sends
trigger informationto the time base controller. Advanced trigger functions are
enabled only whenthe appropriate application modules and supporting software
are installed.
The display system combines live waveformdata from acquisition memory with
menus and text andstores this information in display memory. It then uses this
data to refreshthe XGA display module (LCD).

Acquisition System

TriggerSystem

Display System