Tektronix DD 501 Instruction Manual page 43

Section
7— DD
501
DIAGRAMS AND
CIRCUIT
BOARD
ILLUSTRATIONS
Symbols and Reference Designators
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
inF).
Resistors
= Ohms
(f2).
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
goes to 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.
The following
prefix letters are used as reference designators to identify
components
or assemblies
on
the diagrams.
A Assembly, separable or repairable H
Heat dissipating
device
(heat sink.
S Switch or contactor
(circuit
board,
etc) heat radiator, etc)
T T ransformer
AT
Attenuator, fixed or variable
HR
Heater
TC Thermocouple
B Motor HY
Hybrid circuit
TP
Test point
BT
Battery J Connector, stationary portion U Assembly,
inseparable or non-repairab!e
C
Capacitor, fixed or variable K Relay (integrated circuit, etc.)
CB
Circuit breaker L Inductor, fixed or variable V Electron tube
CR
Diode,
signal or
rectifier
M
Meter VR Voltage regulator (zener diode, etc.)
DL
Delay line
P
Connector,
movable
portion
W
Wirestrap or cable
DS
Indicating device (lamp)
Q
Transistor or silicon-controlled
Y
Crystal
E Spark Gap, Ferrite bead rectifier
Z Phase
shifter
F Fuse R Resistor, fixed or variable
FL
Filter
RT Thermistor
The following
special
symbols
may
appear on the diagrams:
Strap or Link
Cam
Switch
Closure Chart
(Dot indicates
switch closure)
SEL
Value Selected
at
Factory
Test Voltage
Internal
Screwdriver
Adjustment
Functional Block
Outline
Assembly Number
Board Name
Plug to E.C. Board
I
Box
I
Identifies Panel
_
Controls,
Connectors and
|BAL|
^
Indicators
IrC,!
\y Modified
Component— See
Parts
List
(Depicted
in
grey,
crvu- or with grey outline)
Plug Index
Refer
to
Waveform
Refer to Diagram
Number
Coaxial
Connector
Shielding
Heat
Sink
Decoupled or Filtered
Voltage
Etched
Circuit
Board
Outlined
in
Black
Schematic Name
VERTICAL
AMPLlFlER<^>-^anTNTrJ,ber
REV. B
J 'J
N 1378