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Logic Conventions
Module
Interconnection
Circuit Description
This section describes the electrical operation
of
the Tektronix
TAS
475 and
TAS
485 Analog Oscilloscopes. Refer
to
the schematics
in
the Diagrams
section
as
necessary.
This
manual refers to digital logic 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 non-active state. The specific
voltages that constitute a high or low
state vary among the electronic devices.
Active-low
signals are indicated by a tilde
(~)
prefixed to the signal name
(~
RESET). Signal names are considered to be either active-high, active-low,
or to have both active-high and active-low states .
Figure
3-1
shows the interconnection paths between the modules of the
TAS
475 and
TAS
485 Oscilloscopes.
TAS 475 and TAS 485 Service Manual
3-1
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