Tektronix T921 User Manual

DIAGRAMS
AND
CIRCUIT
DESCRIPTION
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
(pF)
.
Resistors =

Ohms
Q)
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 :
The following
prefix letters are used as
Y14 .15,1966
Y14 .2, 1973
Y10 .5,
1968
The following special symbols
may appear on
the diagrams :
Cam Switch
Closure Chart
(Dot indicates
switch closure)
Drafting
Practices .
Line
Conventions and
Lettering .
Letter
Symbols for Quantities
Used in Electrical
Science and
Electrical
Engineering .
reference designators to
identify
components or
assemblies on the
VERTICAL AMPLIFIER
Section 7-T921/T922/T922R
Plug to E .C . Board
F B_ 0
diagrams .
Identifies
Panel
Controls, Connectors
and
BAL
.
Indicators
KA .*

' Parts List(Depicted
in grey,
50k

or
with grey outline)
Plug Index
Shielding
Heat Sink
Decoupled or
Filtered
Voltage
Etched Circuit Board
Outlined
in Black
REV . B JUL
1977
A
Assembly, separable or
repairable H
Heat dissipating device
(heat sink,
S Switch
or contactor
(circuit board, etc)
heat radiator, etc)
T
Transformer
AT
Attenuator, fixed or
variable HR
Heater
TC
Thermocouple
B
Motor
HY Hybrid circuit
TP
U
Test point
Assembly,
inseparable or
non-repairable'
BT
Battery
J Connector,
stationary portion
(integrated
circuit, etc .)
C
Capacitor, fixed
or variable
K Relay
V
Electron
tube
CB Circuit breaker
L Inductor,
fixed or variable
VR
Voltage
regulator (zener
diode, etc .)
CR Diode,
signal or rectifier
M
P
Meter
Connector, movable
portion
W Wirestrap
or cable
DL
DS
Delay
line
Indicating device (lamp)
D
Transistor or
silicon-controlled
Y
Crystal
E
Spark Gap, Ferrite bead
rectifier
z
Phase shifter
F Fuse
R Resistor,
fixed or variable
FL Filter
FIT
Thermistor

Tektronix T921 Specifications

General

Brand	Tektronix
Model	T921
Category	Test Equipment
Language	English