Tektronix 7704A User Manual

BL OC KDIAGR AM
T h
e b
asic b loc k d iagram i n F ig . 2-1 s h
ows
t
he basic
interco
nn
ectio
n
s
between t h e in d ivi d ual b loc k s ; eac
h
b
loc k
r e p rese n ti ng α ma j o
r circuit wit h i n t he i nstrume
n t . T h e
n umbered diamond
in each b loc k refers to t
he circuit
d iagram (locate d at
t h e rear of t h e manual) w
h ic h covers
th at specific part of t
he i nstrument .
B loc k Diagram Descri
p tion
V e r tical signals
fro m b oth vertical plug-in
com p artments
are applie d to
t he V ertical Interface
circuit . T h is circuit
d
etermines w h et h er the sig n al from t
he left or rig h t vertical
p l u g-in unit is dis p laye d . T h
e
selected
ve r tical sig n al is t h en
am
p lified by the V ertical
Am p lifier circ u it to drive
the
vertical deflectio n plates
of t h e C RT .
T h
e
V ertical
Am p lifier circuit
also accepts t he Υ - R ea dout
signal f r om
t h e Readout
System to produce the vertical
portion of t h e
al ph a-n
umeric readou t display .
T he Readout System p rovi d es an
al ph a-numeric d isplay
for informatio n encoded b y t
he pl u g-in un its .
T
h is d isplay
is prese nted on t he C
RT
on α
time-s h are d b asis with t
he
analog wavefo r m d isplay .
H orizontal sig n als
from both h orizo n tal
plug-in
com p artments are con
n ecte d to t he H orizontal
I n terface
circuit . T h is circuit d
ete r mines w h et h er t he signal from
t h e
Α o r Β h orizontal u nit is d is p
layed . T he selecte d
signal is
connected to t he H orizontal
Am p lifier circuit, w
h
ere it is
am
p lified to p r ovi d e t h e h
orizontal deflection for t
h
e
CR T
b
eam . T h e H orizontal
Am p lifier ci r cu it also accepts
t h e
Χ - R eadout sig n al from t
h
e
Rea dout System to p ro d
u
ce
the
h orizontal po r tion of t h e rea d
out dis p lay .
T he L ogic Circuit develo p s
control sig n als for use
i n
ot
h er circuits wit h in t h e
i n
strume
nt a n d pl u g-i n
u
nits .
T h ese con trol sig n als
automatically deter m i ne t
h e correct
operation of t
h
e instr
u ment in relatio n to t he
plug-i n
installed or selecte d ,
t he pl u g-in con trol settings, an
d t he
7704 Α control
settings .
REV . Β ,
ΜΑΥ , 1976
CI
R C U IT D E SC R I P TIO
N
Section 2-7704 Α Service
T h is section of the ma n ual d escribes
t he circ u itry u sed i n t he 7704
Α
Oscillosco p
e System . T he d esc r iption begins wit h α
d isc u ssion of t he instrume n t, using t
he b asic bloc k d iagram s h own on
F
ig . 2-1 .
N ext, each circuit is d escri b e d in d etail, using
d etailed b loc k diagrams w
h
en ap pr
opriate, to s h ow t he relatio n s
h
ip b
etween t h e stages in eac h ma j or ci r cuit . Detaile d
sc h ematics of eac h circ u it a r e located
in the Diagrams sectio n at t h e b ac k of
t h is manual ; refer to t h ese sc h ematics t h roug
h
o
u t
t h e followi ng circ u it d escriptio
n
for
specific electrical val u es a nd relations
h ips .
T h e i n ternal trigger signals from t
h e vertical p l u g-in are
con n ecte d to the Trigger Selector ci r c
u its
.
T h ese ci r cuits
select the trigge r signals to b e app
lie d to t he sweep circ u its
in t
h e h orizo n tal plug-in un its .
T h e Β Trigger Selector also
s
up plies t he d rive signal for t
he V ertical Sig n al Output .
In a dd itio n to t h e V ertical
Signal Outp u t me n tione d
above,
th e Outp u t Signals circ
u
it
also p rovi d es α +Sawtoot
h
Out signal d erive d from t
h e Α
or
Β h orizontal sweep signals,
a
nd +Gate O u t an d rea do
u
t
triggering sig n als d erived from
t h e Α or Β h o r izontal gate
signals .
T he Cali b rator
circ u it prod uces α o
n e- k ilo h ertz
squ are-wave
outpu t . T h is signal is availa b
le
as
α voltage at
t
h
e tro
n t- p
a
n el CA L I BR ATO
R
co
nn ectors or as α curre n t
t hr
o
ug h t h e 40 milliam p ere current-loop
ad a p ter availa b le
as an o p tional accessory .
T h e
I
n
verter/ R ectifiers circuit provi d es t
he low-voltage
p ower
necessary for op eration of t
h
e
enti r e instrument . T he
h ig
h voltages need e d for t he CR
T
are su pp
lied b y t he CRT
Circuit .
T h e C R T Circuit also contains t
h
e
Ζ -Axis Amplifie r
w h ic
h provi d es t h e d rive signal to co
n
trol
t he intensity level
of t
he d isplay .
CI RC U IT
O PER ATION
T h is section p rovi d es α
d etaile d desc r i p tion of the
elect r ical operation and
relations h ip of the ci r c u its in the
7704 Α . T h e th eory of operation fo
r circuits u ni que to t h is
i nstrument is describe d in detail in t
h
is
discussion . Ci r cuits
commonly use d in the elect r
onics
i nd ustry are
not
d escri bed in d etail . If more information is
desire d
on
t h ese
commonly u sed circuits, refer to t
h e following text b oo k s
(also see b oo k s un d er L ogic
F
un d a
m en
tals) :

Tektronix 7704A Specifications

General

Brand	Tektronix
Model	7704A
Category	Test Equipment
Language	English