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Replaceable Parts
7901A
Table 6-7. Reference Designations and Abbreviations
REFERENCE DESIGNATIONS
A
=
assembly
K
=
relay
TB
=
terminal board
B
=
motor, synchro
L
=
inductor
TP
=
test point
BT
=
battery
M
=
mewr
U
=
integrated circuit, non-
C
=
capacitor
P
=
plug connector
repairable assembly
CB
=
circuit breaker
V
=
vacuum tube,
Q
=
semiconductor device
CR
=
diode
other than diode or
photocell, etc_
OL
=
delay line
integrated circuit
VR
=
voltage regulator
OS
=
indicator
W
=
jumper wire
E
=
Misc electrical parts
R
=
resistor
X
=
socket
F
=
fuse
RT
=
thermistor
y
=
crystal
FL
=
filter
S
=
switch
Z
=
tuned cavity, network
J
=
receptacle connector
T
=
transformer
ABBREVIATIONS
A
=
amperes
gra
=
gray
PCA
=
printed-circuit assembly
ac
=
alternating current
grn
=
green
PWB
=
printed-wiring board
Ag
=
silver
phh
=
phillips head
AI
=
aluminum
H
=
henries
pk
=
peak
pop
=
pea k-to-pea k
ar
=
as required
Hg
=
mercury
pt
=
point
adj
=
adjust
hr
=
hourIs)
prv
=
peak inverse voltage
assy
=
assembly
Hz
=
hertz
PNP
=
positive-negative-positive
hdw
=
hardware
pwv
=
peak working voltage
b
=
base
hex
=
hexagon, hexagonal
porc
=
porcelain
bp
=
bandpass
posn
=
position (s)
bpi
=
bits per inch
ID
=
inside diameter
pozi
=
pozidrive
blk
=
black
IF
=
intermediate frequency
blu
=
blue
in.
=
inch, inches
rf
radio frequency
brn
=
brown
=
brs
=
brass
I/O
=
input/output
rdh
=
round head
Btu
=
British thermal unit
int
=
internal
rms
=
root-mean~square
Be Cu
=
beryllium copper
incl
=
include(s)
=
reverse working voltage
rwv
insul
=
insulation, insulated
rect
=
rectifier
cpi
=
characters per inch
impgrg
=
impregnated
r/min
=
revolutions per minute
coli
=
collector
incand
=
incandescent
clockwise
ips
=
inches per second
RTL
=
resistor-transistor logic
cw
=
ccw
=
counterclockwise
kilo (10 3 ), kilohm
k
=
cer
=
ceramic
s
=
second
com
=
common
Ip
=
low pass
SB,TT
=
slow blow
crt
=
cathode-ray tube
Se
=
selenium
CTL
=
complementary-transistor
m
=
milli (10- 3 )
Si
=
silicon
logic
M
=
mega (10 6 ), megohm
=
silicon controlled rectifier
cath
=
cathode
scr
My
=
Mylar
Cdpl
=
cadmium plate
mfr
manufacturer
sst
=
stainless steel
=
comp
=
composition
=
momentary
stl
=
steel
mom
conn
=
connector
mtg
=
mounting
spcl
=
special
compl
=
complete
misc
=
miscellaneous
spdt
=
single-pole, double-throw
met. ox_
=
metal oxide
spst
=
single-pole, single-throw
dc
=
direct current
mintr
=
miniature
dr
=
drive
OTl
=
diode-transistor logic
n
=
nano (10- 9 )
Ta
=
tantalum
depc
=
deposited carbon
nc
=
normally closed or no
td
=
time delay
dpdt
=
double-pole, double-throw
connection
Ti
=
titanium
dpst
=
double-pole, single-throw
Ne
=
neon
tgl
=
toggle
no.
=
number
thd
=
thread
em
=
emitter
n.o.
=
normally open
tol
=
tolerance
ECl
=
emitter-coupled logic
np
=
nickel plated
TTL
=
transistor transistor logic
ext
=
external
NPN
=
negative-positive-negative
encap
=
encapsulated
NPO
=
negative-positive zero (zero
elctlt
=
electrolytic
temperature coefficient)
U(Il)
=
micro (10- 6 )
NSR
=
not separately replaceable
F
=
farads
NRFR
=
not recommended for field
V
=
volt(s)
FF
=
flip-flop
replacement
var
=
variable
flh
=
flat head
vio
=
violet
flm
=
film
00
=
outside diameter
Vdcw
=
direct current working volts
fxd
=
fixed
aBO
=
order by description
filh
=
fillister head
orn
=
orange
W
=
watts
ovh
=
oval head
ww
=
wirewound
G
=
giga (10 9 )
oxd
=
oxide
wht
=
white
Ge
=
germanium
WIV
=
working inverse voltage
gl
=
glass
p
=
pico (10-
12 )
gnd
=
ground(ed)
PC
=
printed circuit
yel
=
yellow
6-14
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