Tektronix TSG-271, Instruction Manual

Page: 145 / 216

TSG 271
8–1
Diagrams/Circuit Board Illustrations
Symbols
Graphic symbols and class designation letters are based on ANSI Standard
Y32.2–1975.
Logic symbology is based on ANSI Y32.14–1973 in terms of positive logic.
Logic symbols depict the logic function performed and may differ from the
manufacturer’s data.
Overline, parenthesis, or leading slash indicate a low asserting state.
Example: ID CONTROL, (ID CONTROL), or /ID CONTROL.
Abbreviations are based on ANSI Y1.1–1972.
Other ANSI standards that are used in the preparation of diagrams by Tektronix,
Inc. are:
Y14.15, 1966 -- Drafting Practices.
Y14.2, 1973 -- Line Conventions and Lettering.
Y10.5, 1968 -- Letter Symbols for Quantities Used in Electrical
Science and Electrical Engineering.
American National Standard Institute
1430 Broadway, New York, New York 10018
Component Values
Electrical components shown on the diagrams are in the following units unless
noted otherwise:
Capacitors: Values one or greater are in picofarads (pF).
Values less than one are in microfarads (
m
F).
Resistors = Ohms (
W
).
The following information and special symbols may appear in this manual.
Assembly Numbers
Each assembly in the instrument is assigned an assembly number (e.g., A20).
The assembly number appears on the diagram (in circuit board outline), circuit
board illustration title, and lookup table for the schematic diagram.