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Model 3555B
Section VI
SECTION VI
REPLACEABLE PARTS
6-1.
INTRODUCTION.
6-2.
This section contains information for ordering
replacement parts.  Table 6-1 lists parts in alphameric
order of their reference designators and indicates the
description, -hp- part number of each part, together with
any applicable notes, and provides the following:
a.
Total quantity used in the instrument (TQ
column).  The total quantity of a part is
given the first time the part number
appears.
b.
Description of the part.  (See list of
abbreviations below.)
c.
Typical manufacturer of the part in a five-
digit code.  (See Appendix A for list of
manufacturers.)
d.
Manufacturer's part number.
6-3.
Miscellaneous parts are listed at the end of
ORDERING INFORMATION.
6-5.
To order a part, note the manufacturer's part
ABBREVIATIONS
Ag.................................................... silver
ID .................................... inside diameter
ns ............ nanosecond(s) = 10
-9
 seconds
SPDT ........single-pole double-throw
Al ..............................................aluminum
impg..................................... impregnated
nar................. not separately replaceable
SPST........... single-pole singe-throw
A..............................................ampere(s)
incd.....................................incandescent
Au......................................................gold
ins...................................... insulation(ed)
Ω
.................................................. ohm(s)
Ta........................................tantalum
obd........................... order by description
TC ............... temperature coefficient
C................................................capacitor
k
Ω
........................ kilohm(s) = 10
+3
 ohms
OD ................................ outside diameter
TiO
2
......................... titanium dioxide
cer ...............................................ceramic
kHz ..........................kilohertz = 10
+3
hertz
tog ...........................................toggle
coef ......................................... coefficient
P ...................................................... peak
tol .......................................tolerance
com ........................................... common
L.................................................. inductor
Pa .................................... picoampere(s)
trim ....................................... trimmer
comp .................................... composition
lin........................................... linear taper
pc ....................................... printed circuit
TSTR ................................ transistor
conn ....................................... connection
log................................. logarithmic taper
pF................................. picofarad(s) 10
-12
farads
V..............................................volt(s)
dep ...........................................deposited
mA .......... milliampere(s) = 10
-3
 amperes
piv ........................... peak inverse voltage
vacw .................... alternating current
DPDT ..............double-pole double-throw
MHz .................... megahertz = 10
+6
 hertz
p/o..................................................part of
working voltage
DPST ...............double-pole single-throw
m
Ω
...................megohm(s) = 10
+6
 ohms
pos .......................................... position(s)
var ........................................ variable
met film.................................... metal film
poly ....................................... polysterene
vdcw .. direct current working voltage
elect ....................................... electrolytic
mfr ......................................manufacturer
pot...........................................potiometer
encap ................................. encapsulated
ms..........................................millisecond
p-p....................................... peak-to-peak
W ...........................................watt(s)
mtg ........................................... mounting
ppm................................ parts per million
w/................................................ with
F .................................................. farad(s)
mV ........................ millivolt(s) = 10
-3
 volts
prec..................... precision (temperature
wiv ............... working inverse voltage
FET .........................field effect transistor
µ
F ...................................... microfarad(s)
........................ coefficient, long term sta-
w/o......................................... without
fxd..................................................... fixed
µ
s.................................... microsecond(s)
............................ bility, and/or tolerance)
ww ................................... wirewound
.................................................................
µ
V .......................microvolt(s) = 10
-6
 volts
GaAs .............................gallium arsenide
my................................................. Mylar®
R ..................................................resistor
*.............. optimum value selected at
GHz .......................gigahertz = 10
+9
 hertz
Rh ...............................................rhodium
factory, average value
gd .............................................guard(ed)
nA .......... nanoampere(s) = 10
-9
 amperes
rms.............................. root-mean-square
shown (part may be omitted)
Ge ......................................... germanium
NC ..................................normally closed
rot....................................................rotary
** .............. no standard type number
grd ..........................................ground(ed)
Ne .................................................... neon
assigned (selected or
NO .................................... normally open
Se ............................................. selenium
special type
H.............................................. henry(ies)
NPO...................... negative positive zero
sect .......................................... section(s)
Hg............................................... mercury
..................(zero temperature coefficient)
Si....................................................silicon
Hz................. hertz (cycle(s) per second)
sl ...................................................... slide
® Dupont de Nemours
DECMAL MULTIPLIERS
Prefix
Symbols
Multiplier
Prefix
Symbols
Multiplier
tear
T
10
12
centi
c
10
-2
giga
G
10
9
milli
m
10
-3
mega
M or Meg
10
6
micro
µ
10
-6
kilo
K or k
10
3
nano
n
10
-9
hecto
h
10
2
pico
p
10
-12
deka
da
10
femto
f
10
-15
deci
d
10
-1
atto
a
10
-18
DESIGNATORS
A............................................... assembly
FL ..................................................... filter
Q ...............................................transistor
TS ............................... terminal strip
B..................................................... motor
HR ................................................. heater
QCR................................transistor-diode
V................. vacuum tube, neon bulb
BT .................................................battery
IC .................................. integrated circuit
R ..................................................resistor
photocell, etc.
C................................................capacitor
J.........................................................jack
RT............................................thermistor
W .............................................cable
CT ...................................................diode
K ...................................................... relay
S ....................................................switch
X............................................. socket
DL............................................. delay line
L.................................................. inductor
T ........................................... transformer
XDS................................ lampholder
DS ....................................................lamp
M.....................................................meter
TB .....................................terminal board
XF.....................................fuseholder
E...............................misc electronic part
MP ................................. mechanical part
TC......................................thermocouple
Y............................................. crystal
F ........................................................fuse
P ....................................................... plug
TP ............................................. test point
Z ........................................... network
6-1