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Tektronix 7704A User Manual

Tektronix 7704A
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Circuit
Description
-7704A
Service
t
h
e
o
p
erating
level
for
t
he
Β
Trigger
Selector
;
R
2423-
R
2425
and R2427-
R
2429
set
t
he
current
gain
for
eac
h
ch
annel
.
T
h
ese
stages
are
ma
d
e up
primarily
of
integ
r
ate
d
circ
u
its
U
2404
and
U
2424
.
An
input/out
p
ut
table
fo
r
U
2404
and
U
2424
is
s
h
own
in
F
ig
.
2-22
.
U
2404-
U
2424
p
rovi
d
e
α
h
ig
h-impe
d
ance
d
iffere
n
tial
in
pu
t
for
t
he
trigger
signal
from
t
h
e
left
vertical
unit
at
pins
2
an
d
15
and
for
t
he
trigger
signal
from
t
h
e
r
ig
h
t
vertical
unit
at
pins
7
and
10
.
T
he o
u
tp
u
t
signal
at
pins
12 and 13
is
α
d
ifferential
signal
.
T
h
e
sum
of
t
he
DC
curre
n
t
at
p
ins
12
and
13
is
always
e
q
ual
to
t
he
sum
of
the
DC
currents
at
pins
1,
8,
9, an
d 16
in
all
mo
d
es
.
T
h
is
provides
α
constant
DC
bias
to
t
h
e
following
stages
as
t
h
e
Α
or
Β
T
R
IGG
ER
SOUR
C
E
switc
h
es
or
t
he
VER
TICA
L
M
OD
E
switc
h
are
changed
.
Α
Trigger
Out
p
ut
Am
p
lifier
Transistors
Q2414
and
Q2416
provide
a
low-resistance
loa
d
for
t
he
Α
Trigger
Selector IC
w
h
ile
provi
d
ing
α
h
ig
h
outp
ut
impe
d
ance
to
t
he
following
circuits
.
(The
Α
H
O
R
IZ
unit
provi
d
es
α
50-o
h
m
differential
loa
d
for
t
h
is
circ
u
it
;
if
it
is
remove
d
from
its
compartment,
t
he
voltage
swing
at
t
he
collectors
of
Q2414-Q2416
will
increase
s
u
bstantially
.)
Β
Trigger
Output
Am
p
lifier
Q2444-Q2446
provi
d
e
α
low-resistance
loa
d
fo
r
t
he
Β
Trigger
Selector IC
w
h
ile
p
roviding
α
h
ig
h
output
im
p
e
d
ance
to
t
h
e
trigger
circuit,
and
isolation
b
etween
t
h
e
Β
H
O
R
IZ
trigger
circuits
an
d
t
he
V
ertical
Signal
Out
Amplifier
.
ηΛ
F
CHA
NNEL
S
W
ITC
H
SIG
NA
L
(DIS
P
LAY
R
IG
H
T)
SIG
N
A
L
FR
O
M
LEF
T
V
E
R
TICA
L
UN
IT
SIG
N
A
L
FR
O
M
R
IG
H
T
VER
TICA
L
UN
IT
2-
28
AU
XI
LIA
RY
Υ
AXIS
VE
R
TICA
L
T
R
AC
E
SEPARATION
Β
MOD
E
(
ΗΟΡΙΖ
)
MF
C
H
A
NNEL
S
W
ITC
H
SIG
N
A
L
(DIS
PL
AY
Β
)
V-H
INHIBIT
ADD
M
OD
E
(VER
T
Fig
.
2-23
.
Detaile
d b
loc
k
d
iag
r
a
m
of Vertical
I
n
terface
ci
r
c u
it
.
T
he
Β
H
O
R
IZ
plug-in
p
rovi
d
es
α
50-o
h
m
d
ifferential
load
for
Q2444-Q2446
.
If
t
h
is
plug-in
is
removed
from
its
compartment,
t
he
collector
load
for
t
h
ese
transistors
c
h
anges
and
t
he
voltage
swi
n
g
at
th
eir
collectors
increases
.
CR
2444-C
R
2449
clamp
t
h
e
collectors
of
Q2444-Q2446
at
abou
t
+0
.6
volt
to
p
revent
t
h
ese
transistors
from
sat
u
rating
under
t
h
is
no-load
condition
.
V
ertical
Signal
Out
Amplifier
T
h
e
trigger
out
p
ut
signal
at
pins
12
and
13 of
t
h
e
Β
Trigger
Selector IC
is
also
connected
t
h
ro
ugh
Q2434-02436
to
t
he
V
ertical
Signal
Out
circuit
.
R
2437
t
h
roug
hR
2441
p
rovide
α d
ifferential
output
resistance
of
a
b
out
100
oh
ms
.
VER
TICA
L
I
N
T
ERF
AC
E
T
h
e
V
ertical
I
n
terface
circuit selects
t
he
vertical
d
eflec-
tion
signal
from
t
he output
of
t
h
e
LEF
T
VER
T
or
RIG
H
T
VER
T
plug-in
compartments
.
It
also
acce
p
ts
an
input
from
t
he
Rea
dout
System
to bloc
k
t
h
e
vertical
signal
w
h
ile
reado
u
t
information
is
d
is
p
layed
on
t
h
e
CR
T
.
In
add
ition,
t
h
is
circ
u
it
contains
t
h
e
V
ertical
Trace
Separation
stage
to
s
h
ift
t
h
e
vertical
position
of
o
ne
sweep
of
α
dual-sweep
display
.
F
igure
2-23
s
h
ows
α
detailed
b
loc
k
d
iagram
of
t
he
V
ertical
I
n
terface
circuit
.
V
ertical
Plug-in
Selector
T
h
e
V
ertical
Plug-in
Selector
d
etermines
w
h
ic
h
in
p
u
t
signal
p
r
ovi
d
es
t
h
e
vertical
sig
n
al
to
the
V
ertical
Bu
ffer
VER
TICA
L
SIG
N
A
L
TO
VER
TICA
L
A
MPL
IFI
ER
CI
R
C
U
IT

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Tektronix 7704A Specifications

General IconGeneral
BrandTektronix
Model7704A
CategoryTest Equipment
LanguageEnglish

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