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Tektronix 7613 User Manual

Tektronix 7613
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Circuit
Description—-7613/R7613
Service
TRIG
ii
SOURCE
switch
positions
VERT
MODE
LEFT
switch
VERT
MODE
positions
RIGHT
LEFT
LO
{Left
Verti-
j
h
]
‘
cal)
Switches
from
ALT
LO
to
HI,
and
vice
versa,
at
end
of
each
sweep
(both;
follows
disptay}
LO
(Left
|
Hi
(Right
ADD
LO
at
pin
4
of
Vertical) Vertical)
U324.
HI
at
pin
14!
(both;
cHoP
added
=
algebrai-
cally}
Hy
{Right
Verti-
1
1
y
RIGHT
‘Pin
14
LO
for
all
other
conditions.
Fig.
3-14.
Input
levels
at
pin
4
of
U324
(source
of
triggering
is
shown
in
parenthesis).
RIGHT
section
of
$1011
establishes
a
LO
output
level
at
the
emitter
of
Q314.
Right.
In
the
RIGHT
position
of
the
TRIG
SOURCE
switch,
+5
volts
is
connected
to
the
emitter
of
Q314
through
$1011
and
R312.
This
produces
a
HI
output
level
to
the
Trigger
Channel
Switch
stage.
Trigger
Channel
Switch
The
Trigger
Channel
Switch
stage
determines
which
input
signal
provides
the
trigger
signal
to
the
horizontal
compartment
as
controlled
by
the
Trigger
Mode
and
ADD
signals
from
the
trigger
selection
circuitry.
Refer
to
diagram
3
during
the
following
discussion.
Resistors
R317-R319
establish
the
input
resistance
and
provide
a
load
for
the
trigger
signal
from
the
right
vertical
plug-in
unit.
Resistors
R307
and
R308
provide
the
input
resistance
and
load
for
the
left
vertical
plug-in
unit.
R321-R323-R324
and
R326-R327-R328
establish
the
oper-
ating
level
of
the
Trigger
Channel
Switch;
R321-R323
and
R326-R328
set
the
current
gain
for
each
channel.
This
stage
is
made
up
primarily
of
integrated
circuit
U324.
An
input/output
table
for
U324
is
shown
in
Fig.
3-15.
U324
provides
a
high
impedance
differential
input
for
the
trigger
signal
from
the
left
vertical
unit
at
pins
2
and
15,
ana
for
3-18
the
trigger
signal
from
the
right
vertical
unit
at
pins
7
and
10.
The
output
signal
at
pins
12
and
13
is
a
differential
signal.
The
sum
of
the
DC
current
at
pins
12
and
13
is
always
equal
to
the
sum
of
the
DC
currents
at
pins
1,
8,
9,
and
16
in
al}
modes.
This
provides
a
constant
DC
bias
to
the
stages
which
follow
as
the
TRIG
SOURCE
or
the
VERT
MODE
switches
are
changed.
When
the
level
at
pin
4
is
LO
(see
Trigger
Mode
and
ADD
Signals
discussion
and
Fig.
3-15),
the
trigger
signal
from
the
left
vertical
unit
passes
to
the
output,
while
the
trigger
signal
from
the
right
vertical
unit
is
blocked.
A
HI
level
at
pin
4
connects
the
trigger
signal
from
the
right
vertical
unit
to
the
output
and
the
trigger
signal
from
the
left
vertical
unit
is
blocked.
For
VERT
MODE
operation
in
the
ALT
position
of
the
VERT
MODE
switch,
the
level
at
pin
4
switches
between
the
LO
and
HI level
at
a
rate
determined
by
the
Vertical
Binary
stage
(see
Logic
circuit
description).
This
action
obtains
the
trigger
signal
from
the
left
vertical
unit
when
the
left
vertical
unit
is
being
displayed
and
from
the
right
vertical
unit
when
it
is
being
displayed.
When
the
level
at
pin
4
is
LO
and
the
level
at
pin
14
is
HI, the
trigger
signal
from
both
the
left
and
right
vertical
units
passes
to
the
output
pins.
This
condition
occurs
only
when
the
TRIG
SOURCE
switch
is
set
to
VERT
MODE
and
the
VERT
MODE
switch
is
set
to
either
ADD
or
CHOP.
Under
this
operating
mode,
the trigger
output
signal
is
the
algebraic
sum
of
the
trigger
input
signals
from
the
left
and
right
vertical
units
to
prevent
triggering
on
the
vertical
chopping
transition,
or
only
on
one
signal
of
an
added
display.
Trigger
Output
Amplifier
The
trigger
output
at
pins
12
and
13
of
U324
is
connected
to
the
bases
of
0344-0346
to
provide
the
internal
trigger
signal
for
the
horizontal
unit
(via
the
Main
Interface
circuit).
The
horizontal
unit
provides
a
50-ohm
differential
load
for
this
stage.
If
it
is
removed
from
its
compartment,
the
collector
load
for
Q344-0346
changes
and
the
voltage
at
their
collectors
increases.
This
stage
prevents
this
change
from
affecting
the
vertical
signal
for
the
Output
Signals
board.
CR341-CR349
clamp
the
collec-
tors
of
344
and
0346
at
about
+0.6
volt
to
prevent
these
transistors
from
saturating
under
this
no-load
condition.
Vertical
Signal
Buffer
The
trigger
output
signal
at
pin
12
and
13
of
U324
is
also
connected
to
the
emitter
of
a
common-base
amplifier
0336
and
0334.
The
output
signal
at
the
collector
of
Q336
and
0334
is
connected
to
the
signals
out
board.
7613

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Tektronix 7613 Specifications

General IconGeneral
BrandTektronix
Model7613
CategoryTest Equipment
LanguageEnglish

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