Tektronix DSA8300 Service Manual page 23

Theory of Operation
DSA8300 Digital Serial Analyzer and Modules Service Manual
This chapter describes the electrical operation of the instrument and sampling
modules.
The instrument contains many digital logic circuits. This manual refers to these
circuits with standard logic symbols and terms. Unless otherwise stated, all logic
functions are described using the positive-logic convention: the more positive of
the two logic levels is the high (1) state, and the more negative level is the low (0)
state. Signal states may also be described as "true", meaning their active state,
or "false", meaning their nonactive state. The specific voltages that constitute a
high or low state vary among the electronic devices.
The instrument control system is a dual Wintel/PowerPC based processor board.
The platform features XGA resolution flat-panel display, transparent touch screen
and user front-panel with direct access to commonly used oscilloscope functions.
The instrument is also equipped with a mouse and keyboard for access to more
advanced functions.
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