Atec Tektronix-1502 - Manual (Page 98)

TM 9-4935-601-14-3&P
SECTION 8
DIAGRAMS AND 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.
The overline on a signal name indicates that the signal performs its intended function when it is in the low state.
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 (
µF).
Resistors = Ohms (
Ω
).
The information and special symbols below may appear in this manual.
Assembly Numbers and Grid Coordinates
Each assembly in the instrument is assigned an assembly number (e.g., A20). The assembly number appears on the circuit board outline on
the diagram, 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 *(see following illustration for constructing a component number).
The schematic diagram and circuit board component location illustration have grids. A lookup table with the grid coordinates is provided for
ease of locating the component. Only the components illustrated on the facing diagram are listed in the lookup table. When more than one
schematic diagram is used to illustrate the circuitry on a circuit board, the circuit board illustration may only appear opposite the first diagram on
which it was illustrated; the lookup table will list the diagram number of other diagrams that the circuitry of the circuit board appears on.
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