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nA . . . . . . . . . . . . . . nanoampere
NC . . . . . . . . . . . . no connection
N/C . . . . . . . . . normally closed
NE . . . . . . . . . . . . . . . . . . . . . neon
NEG . . . . . . . . . . . . . . . negative
nF . . . . . . . . . . . . . . . . nanofarad
NI PL . . . . . . . . . . . nickel plate
N/O . . . . . . . . . . . normally open
NOM . . . . . . . . . . . . . . . . nominal
NORM . . . . . . . . . . . . . . . . normal
NPN negative-positive-negative
NPO . . . . . . . . negative-positive
zero . . . . . . . (zero temperature
coecient)
NRFR . . not recommended for
eld replacement
NSR . . . . . . . . . . . not separately
replaceable
ns . . . . . . . . . . . . . . . nanosecond
nW . . . . . . . . . . . . . . . . nanowatt
OBD . . . . . order by description
OD . . . . . . . . . outside diameter
OH . . . . . . . . . . . . . . . . oval head
OP AMPL operational ampli er
OPT . . . . . . . . . . . . . . . . . . option
OSC . . . . . . . . . . . . . . . . oscillator
OX . . . . . . . . . . . . . . . . . . . . oxide
oz . . . . . . . . . . . . . . . . . . . . . ounce
. . . . . . . . . . . . . . . . . . . . . . . ohm
P . . . . peak (used in Parts List)
PAM . . . . . . . . . pulse-amplitude
modulation
PC . . . . . . . . . . . . printed circuit
PCM . . pulse-code modulation;
pulse-count modulation
PDM . . . . . . . . . . pulse-duration
modulation
pF . . . . . . . . . . . . . . . . picofarad
PH BRZ . . . . . .phosphor bronze
PHL . . . . . . . . . . . . . . . . . Phillips
PIN . . . . . . . . positive-intrinsic-
negative
Abbreviation
Table 4-3. Abbreviations (continued)
PIV . . . . . peak inverse voltage
pk . . . . . . . . . . . . . . . . . . . . . peak
PL . . . . . . . . . . . . . . . phase lock
PLO . . . . . phase lock oscillator
PM . . . . . . . . .phase modulation
PNP positive-negative-positive
P/O . . . . . . . . . . . . . . . . . . part of
POLY . . . . . . . . . . . . polystyrene
PORC . . . . . . . . . . . . . . porcelain
POS positive; position(s) (used
in Parts List)
POSN . . . . . . . . . . . . . . . . position
POT . . . . . . . . . . . potentiometer
p-p . . . . . . . . . . . . . peak-to-peak
PP peak-to-peak (used in Parts
List)
PPM pulse-position modulation
PREAMPL . . . . . . . preampli er
PRF pulse-repetition frequency
PRR . . . . . pulse repetition rate
ps . . . . . . . . . . . . . . . . picosecond
PT . . . . . . . . . . . . . . . . . . . . point
PTM . . . pulse-time modulation
PWM . pulse-width modulation
PWV . . . peak working voltage
RC . . . . resistance-capacitance
RECT . . . . . . . . . . . . . . . . recti er
REF . . . . . . . . . . . . . . . reference
REG . . . . . . . . . . . . . . . regulated
REPL . . . . . . . . . . . . . replaceable
RF . . . . . . . . . . radio frequency
RFI . . . . . . . . . . radio frequency
interference
RH . . . round head; right hand
RLC . . . resistance-inductance-
capacitance
RMO . . . . . . . . rack mount only
rms . . . . . . . . root-mean-square
RND . . . . . . . . . . . . . . . . . . . round
RAM . random-access memory
ROM . . . . . . read-only memory
Table 4-4. Multipliers
Pre x
R&P . . . . . . . . . . rack and panel
RWV reverse working voltage
S . . . . . . . . scattering parameter
s . . . . . . . . . . . . . . . second (time)
. . . " . . . second (plane angle)
S-B . . . . . . . . . . slow-blow (fuse)
(used in Parts List)
SCR silicon controlled recti er;
screw
SE . . . . . . . . . . . . . . . . . selenium
SECT . . . . . . . . . . . . . . . . sections
SEMICON . . . . . .semiconductor
SHF . . . . super-high frequency
SI . . . . . . . . . . . . . . . . . . . . silicon
SIL . . . . . . . . . . . . . . . . . . . . silver
SL . . . . . . . . . . . . . . . . . . . . . slide
SNR . . . . . . signal-to-noise ratio
SPDT single-pole, double-throw
SPG . . . . . . . . . . . . . . . . . . .spring
SR . . . . . . . . . . . . . . . . . split ring
SPST single-pole, single-throw
SSB . . . . . . . . . . single sideband
SST . . . . . . . . . . . stainless steel
STL . . . . . . . . . . . . . . . . . . . . steel
SQ . . . . . . . . . . . . . . . . . . . square
SWR . . . . . standing-wave ratio
SYNC . . . . . . . . . . . . synchronize
T . . . . . . timed (slow-blow fuse)
TA . . . . . . . . . . . . . . . . . tantalum
TC temperature compensating
TD . . . . . . . . . . . . . . . time delay
TERM . . . . . . . . . . . . . . terminal
TFT . . . . . . . thin- lm transistor
TGL . . . . . . . . . . . . . . . . . . . toggle
THD . . . . . . . . . . . . . . . . . . thread
THRU . . . . . . . . . . . . . . . through
TI . . . . . . . . . . . . . . . . . . titanium
TOL . . . . . . . . . . . . . . . .tolerance
TRIM . . . . . . . . . . . . . . . . trimmer
TSTR . . . . . . . . . . . . . . transistor
TTL . transistor-transistor logic
Parts List
TV . . . . . . . . . . . . . . . . television
TVI . . . television interference
TWT . . . . traveling wave tube
U . . . . . . . . . . . . . . micro (10
(used in Parts List)
UF . microfarad (used in Parts
List)
UHF . . . . . ultra-high frequency
UNREG . . . . . . . . . . unregulated
V . . . . . . . . . . . . . . . . . . . . . . . volt
VA . . . . . . . . . . . . . . . voltampere
Vac . . . . . . . . . . . . . . . . . volts, ac
VAR . . . . . . . . . . . . . . . . . variable
VCO . . . . . . . voltage-controlled
oscillator
Vdc . . . . . . . . . . . . . . . . volts, dc
VDCW volts, dc, working (used
in Parts List)
V(F) . . . . . . . . . . . . volts, ltered
VFO . . . . . . variable-frequency
oscillator
VHF . . . . . very-high frequency
Vpk . . . . . . . . . . . . . . volts, peak
Vp-p . . . . . volts, peak-to-peak
Vrms . . . . . . . . . . . . . . volts, rms
VSWR . voltage standing-wave
ratio
VTO . . voltage-tuned oscillator
VTVM vacuum-tube voltmeter
V(X) . . . . . . . . . . volts, switched
W . . . . . . . . . . . . . . . . . . . . . . watt
W/ . . . . . . . . . . . . . . . . . . . . . with
WIV . . working inverse voltage
WW . . . . . . . . . . . . . . wirewound
W/O . . . . . . . . . . . . . . . . . without
YIG . . . . . . yttrium-iron-garnet
Z
. . . characteristic impedance
o
Multiple
12
9
6
3
1
2
3
6
9
12
15
18
Parts List
6
)
4-7
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