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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
Table 6-1.
6-4. ORDERING INFORMATION.
6-5. To order a part, note the manufacturer's part
number (Table 6-1, MFR PART NO.) and then cross
reference that number in the cross-reference index
(Table 6-2). Order the part through normal channels. If
the NSN is not listed for the part in Table 6-2, order by
MFR PART NO. and the manufacturer's identification
number listed under the MFR number in Table 6-1.
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 kΩ........................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 mΩ ...................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 µF...................................... microfarad(s) ........................coefficient, long term sta- w/o.........................................without
fxd.....................................................fixed µs....................................microsecond(s) ............................bility, and/or tolerance) ww...................................wirewound
................................................................. µV.......................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