Tektronix ECO 422, Instruction Manual

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ECO 422
4–1
Theory of Operation
Introduction
This section provides information on how the ECO 422 circuitry works, in order
to troubleshoot the instrument.
Logic Conventions
Signal names are all capital letters. For example, SIGNAL.
An active low signal (normally denoted by an overscore) is a signal name
enclosed in parentheses. For example, (SIGNAL).
The aside of a signal name is always in square brackets. For example, [SIG-
NAL].
The aside of an active-low signal is the signal name in parentheses and then
enclosed in square brackets. For example, [(SIGNAL)].
ECO 422 Block Level Description (See Figure 4–1)
Figure 4–1: Block Diagram of the ECO 422