Tektronix PG 506 Instruction Manual page 71

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DIAGRAMS AND CIRCUIT BOARD ILLUSTRATIONS
Symbols
r
Y14 .1S, 1966
Drafting Practices .
Graphic symbols and class designation letters are
based on ANSI Standard Y32.2-197S.
Logic symbology is based on ANSI Y32.14-1973 in
r
terms of positive logic. Logic symbols depict the logic
function performed and may differ from the manufac­
turer'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 Y 1.1-1972.
Other ANSI standards that are used in the preparation
of diagrams by Tektronix, Inc. are:
Y14 .2,1973
Line Conventions and Lettering .
Y1O.S, 1968
Letter Symbols for Quantities Used in
Electrical Science and Electr i cal
Engineering.
American National Standard Institute
1430 Broadway
New York, New York 10018
Component V alues
Electrical components shown on the diagrams are in
the following units unless noted otherwise:
Capacitors = Values one or greater are i n picofarads (pF) .
Values less than one are in microfarads
(pF).
Resistors
=
Ohms (0).
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 ill ustration. The
Replaceable Electrical Parts list is arranged by assemblies
in numerical sequence ; the components are listed by
component number ·(see following illustration for
constructi ng a com ponent num ber).
Function Block
Tille
Inter nal
Scre wdriver
Adj ustment
Cam SwitC h
Closure Char!
(001 indi ca tes
swi t c h closure)
Etched C ircuil B oard
Ou lli ned in Bla ck
Reier to Waveform
Fun ction Block
Outline
Ie Iype
Test Voltage
Heat Sink
Board Name
P/ O-Parlol
ci rcuil board
Assembly Number
Tekt ron ix Part No,
lot c irc uil boards
The schematic diagram and circuit board component
location illustration have grids. A lookup table with the
grid coordi nates is provided for ease of locating the
com ponent. ani y the com ponents ill ustrated on the facing
diagram are listed in the lookup table. When more than
one schem atic diagram is used to ill ustrate the circuitry on
a circuit board, the circuit board illustration may only
appear opposite the first diagram on which it was il ­
lustrated; the lookup table will list the diagram number of
other diagrams that the circuitry of the circuit board
A
B
C
_ _L _
1
2
3
P/O AS TIMING BOAR D
+
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appears on .
0
0
M o d i f i e d Comp o ne nt
( De pi c t ed i n Gr e y. or Wit h
Grey Ou llu1 e) · See ParI S
List
Str ap or Lin k
Plug to E.C B oard
[~OXtl .
Ide ntifies Panel
on rols, Connectors and
Indicators
C oax ial connectors
male
femal e
Plug Inde)( . sign i fies pi n No.1
Exte rnal Soewdri ver Ad, _
Shi elding
Selec ted value . see Pa n s List
Ild Mai n ten anc e Seclton lor
Selec tion Cr lten
De co upl ed or Filtered
Vollage
Refer to Di agram Number
SchematiC Nam e
and Number