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Diagrams and Circuit Board Illustrations
Symbols
Component Values
Graphic Items and
SpeCial Symbols
Used
in
This Manual
This section contains circuit board illustrations,
component
locator tables,
waveform illustrations, and schematic diagrams
for
this oscilloscope.
Graphic symbols and class designation letters are based on
ANSI Standard
Y32.2-1975. Abbreviations are based on
ANSI Y1.1-1972.
Logic
symbology
is based
on
ANSI/IEEE Std 91-1984 in terms
of
positive
logic. Logic symbols depict the logic function performed and can differ
from
the manufacturer's data.
The tilde
(rv) preceding a Signal name indicates
that
the signal performs its
intended function when
in
the
low state.
Other standards used in
the
preparation
of
diagrams
by
Tektronix. Inc are:
• Tektronix Standard 062-2476 Symbols and Practices for Schematic
Drafting
• ANSI Y14.159-1971 Interconnection Diagrams
• ANSI Y32.16-1975 Reference Designations
for
Electronic Equipment
• MIL-HDBK-63038-1A Military Standard Technical Manual Writing Hand-
book
Electrical
components
shown
on
the diagrams are in the following units
unless noted otherwise:
Capacitors:
Resistors:
Values
one
or
greater are in picofarads (pF). Values less
than one are in microfarads
(!!F).
Values are in Ohms (Q).
Each assembly in the instrument is assigned an assembly identifier (for
example,
MAIN
or
A5). The assembly identifier
appears
on the circuit board
outline on the diagram (see Figure 9-1), in the title
for
the circuit board
component
location illustration, and in the lookup table
for
the schematic
diagram and corresponding
component
locator illustration. The Replaceable
Electrical
Parts list is arranged
by
assemblies in numerical sequence; the
components
are listed
by
component
number
.
TAS
475
and
TAS
485
Service
Manual
9·1
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