Tektronix 4000 Series, Руководство по обслуживанию

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Theory of Operation
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Tektronix 4000 Series Digital Phosphor Oscilloscopes Service Manual
Power Supply
The Power Supply board converts AC line voltage to +12 V to power for all
internal circuits.
I/O Board
The I/O board contains USB ports, a CompactFlash port, an Ethernet port
(LAN), an XGA Video port, and a Trigger Out BNC connector.
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