Model 8640B TM 9-4935-601-14-7&P
Table 6-2. Reference Designations and Abbreviations (2 of 2)
MOD........................modulator OD ...............outside diameter PWV .................peak working TD ..........................time delay
MOM momentary OH .......................... oval head voltage TERM ........................terminal
MOS .................... metal-oxide OP AMPL .............. operational RC .........................resistance- TFT ............thin-film transistor
semiconductor amplifier capacitance TGL .............................. toggle
ms..........................mllisecond OPT ..............................option RECT .........................rectifier THD .............................thread
MTG.........................mounting OSC ......................... oscillator REF..........................reference THRU .........................through
MTR ............ meter (indicating OX ................................. oxide REG.........................regulated TI .............................. titanium
device) oz .................................ounce REPL.....................replaceable TOL.......................... tolerance
mV ............................ millivolt Ω..................................... ohm RF ..................radio frequency TRIM...........................trimmer
mVac ....................millivolt, ac P ...............peak (used in parts RFI..................radio frequency TSTR ...................... transistor
mVdc millivolt. dc list) interference TTL ...........transistor-transistor
mVpk ................millivolt, peak PAM ..............pulse-amplitude RH................ round head; right logic
mVp-p millivolt. peak- modulation hand TV............................ television
to-peak PC .....................printed circuit RLC .......................resistance- TVI........ television interference
mVrms millivolt. rms PCM pulse-code modula- inductance- TWT .........traveling wave tube
mW milliwatt tion; pulse-count capacitance U..................micro (10
6
) (used
MUX ......................... multiplex .............................. modulation RMO ..............rack mount only in parts list)
MY................................. mylar PDM................. pulse-duration rms .............root-mean-square UF.............microfarad (used in
µA ......................microampere .............................. modulation RND ..............................round parts list)
µF ..........................microfarad pF ............................picofarad ROM .......... read-only memory UHF ......... ultrahigh frequency
µH ........................microhenry PH BRZ.........phosphor bronze R&P .................rack and panel UNREG................ unregulated
µmho.......................micromho PHL............................. Phillips RWV ..............reverse working V....................................... volt
µs microsecond PIN positive-intrinsic- voltage VA......................... voltampere
µV microvolt negative S .............scattering parameter Vac ...........................volts, ac
µVac .................. microvolt, ac PIV......................peak inverse s........................ second (time) VAR ........................... variable
µVdc microvolt, dc voltage ..." . ...... second (plane angle) VCO ........... voltage-controlled
µVpk................microvolt, peak pk....................................peak S-B ............... slow-blow (fuse) oscillator
µVp-p . microvolt, peak- PL phase lock (used in parts list) Vdc ...........................volts, dc
to-peak PLO .......................phase lock SCR .............silicon controlled VDCW..........volts, dc, working
µVrms microvolt, rms oscillator ........................rectifier; screw ...................(used in parts list)
µW ......................... microwatt PM ..............phase modulation SE ............................selenium V(F) ...................volts. filtered
nA........................nanoampere PNP ............ positive-negative- SECT .........................sections VFO .......... variable-frequency
NC ....................no connection ....................................positive SEMICON ............... semicon- oscillator
N/C normally closed P/O part of ductor VHF ..................very-high fre-
NE ..................................neon POLY ...................polystyrene SHF .................. superhigh fre- quency
NEG negative PORC porcelain quency Vpk .......................volts, peak
nF............................nanofarad POS ......... positive; position(s) SI .................................silicon Vp-p ........ volts, peak-T0-peak
NI PL nickel plate (used in parts list) SIL ................................. silver Vrms ...................... volts, rms
N/O................... normally open POSN ........................ position SL .................................. slide VSWR........... voltage standing
NOM...........................nominal POT ................. potentiometer SNR .......signal-T0-noise ratio wave ratio
NORM ......................... normal p-p .................... peak-T0-peak SPDT ....................single-pole, VTO ..................voltage-tuned
NPN......... . negative-positive- PP............peak-T0-peak (used .......................... double-throw oscillator
negative in parts list) SPG ............................. spring VTVM..................vacuum-tube
NPO ............. negative-positive PPM ................. pulse-position SR ............................ split ring voltmeter
zero (zero tempera- modulation SPST ....................single-pole, V(X) ................. volts, switched
ture coefficient) PREAMPL preamplifier single-throw W .................................... watt
NRFR ......... not recommended PRF ................pulse-repetition SSB ............... single sideband W/ ................................... with
for field replace- frequency SST ..................stainless steel WIV.................working inverse
....................................... ment PRR ................pulse repetition STL ................................. steel voltage
NSR not separately rate SQ .............................. square WW ...................... wirewound
replaceable ps ......................... picosecond SWR ........ standing-wave ratio W/O ............................without
ns ....................... nanosecond PT ..................................point SYNC .................. synchronize YIG ...........yttrium-iron-garnet
nW ........................... nanowatt PTM ....................... pulse-time T ..........timed (slow-blow fuse) Z
0
...................... characteristic
OBD ............ order by descrip- .............................. modulation TA ............................ tantalum impedance
tion PWM ....................pulse-width TC........................ temperature
modulation compensating
NOTE
All abbreviations in the parts list will be in upper-case.
MULTIPLIERS
Abbreviation Prefix Multiple
T tera 10
12
G giga 10
9
M mega 10
6
k kilo 10
3
da deka 10
d deci 10
-1
c centi 10
-2
m milli 10
-3
µ micro 10
-6
n nano 10
-9
p pico 10
-12
f femto 10
--15
a atto 10
-18
6-4
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