Tektronix 2235A Instruction Manual page 159

Section 9-2235A Instruction
DIAGRAMS AND CIRCUIT BOARD ILLUSTRATIONS
Symbols
ANSIIIEEE 280- 1985 Letter Symbols for Quantities
Used in Electrical Science and
Graphics symbols and class designation letters are based on
Electrical Engineering.
ANSl Standard Y32.2-1975.
Logic symbology is based on ANSIIIEEE 91-1984. Logic
symbolsdepictthe logicfunction performedand may differfromthe
manufacturer's data.
American National Standards Institute
1430 Broadway
New York, New York 10018
The (L) aftera signal name indicates that the signal performs its
Component Values
intended function when it is in the LO state.
Abbreviations are based on ANSl Y1.1-1972.
Electrical Components shown on the diagrams are in the
following units unless noted otherwise:
Other ANSl standards that are used in the preparation of
diagrams by Tektronix, Inc., are:
Capacitors
Values one or greater are in picofarads (pF).
Values less than one are in microfarads (pF).
Y14.15-1966 Drafting Practices.
Y14.2M-1979 Line Conventions and Lettering. Resistors Ohms
(a).
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
illustrations 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 diagramsthat thecircuitry
of the circuit board appears on.
Function Block Tltle
Modifled Component
Boxed-See Pans ~1st
Plug to E.C. Board
-
ldentlfles Panel
Controls. Connectors
and Indicators
Coaxlal conneclors:
male
female
External Screwdriver Ad].
Shleldlng
Clrcult Board Ground
selecled value, see pans
and Maintenance Secuon
Selection
Crlterla
LlSt
I
for
Scans by AR
TEK MEDM
Decoupied or Flltered
voltage
Schematlc Name
and Number