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Tektronix 7613 User Manual

Tektronix 7613
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J409
Input
Vertical
Readout
——->
Balance
Signal
0407-0415
Vertical
;
—_—_—_—_—_—
Defiecti
Vertical
Vertical
Signal
to
"
Signal
from
Amplifier
vertical
Delay
Line
U450
__
deflection
Y
”
plates
on
CRT
Limit
Command
Beam
Finder
from
BEAM
>
Network
FINDER
switch
Q496
Display
Limited Current
to
Horizontal
Amplifier
Fig.
3-18.
Vertical
Amplifier
detailed
block
diagram.
Input
Balance
0407-0415
comprise
a
paraphase
amplifier
to
provide
input
balance
for
the
Vertical
Amplifier
by
changing
the
DC
levels
at
pins
2
and
4
of
U450.
Vertical
Centering
adjustment
R403
determines
the
bias
at
the
base
of
Q407.
As
this
bias
is
changed,
the
levels
at
the
collectors
of
Q407
and
Q415
change
due
to
paraphase
action.
This
DC
level
is
connected
to
pin
2
of
U450
through
R408-R423
and
to
pin
4
through
R414-R424.
R403
is
adjusted
so
the
trace
is
displayed
at
the
center
of
the
CRT
when
the
inputs
to
this
circuit
are
at
the
same
potential.
The
input
to
the
base
of
0407
through
J409
is
used
for
Vertical
readout
signal.
Output
Amplifier
Amplification
of
the
vertical
signal
is
accomplished
by
integrated
circuit
U450.
The
circuit
shown
within
the
shaded
area
is
a
representation
of
the
circuit
contained
within
U450.
Notice
that
the
circuit
is
made
up
of
three
similar
push-pull
stages.
Each
stage
has
a
pair
of
common
emitter
transistors
driving
a
pair
of
low
input
impedance
common
base
transistors.
Frequency
compensation
is
pro-
vided
by
the
networks
connected
between
pins
2
and
4
in
the
first
amplifier
stage
and
pins
7
and
8,
13
and
14
in
the
Circuit
Description—7613/R7613
Service
third
amplifier
stage.
The
resistive
network
connected
to
pins
3, 6,
and
16
determines
the
gain
of
the
Vertical
Amplifier.
Vertical
Gain
adjustment
R447
sets
the
gain
of
the
second
amplifier
stage
to
determine
the
overall
gain
of
the
vertical
deflection
system
and
thereby
provide
a
calibrated
deflection
factor.
Bias
adjustment
R486
sets
the
voltage
level
at
pin
10
of
U450
(nominally
4.3
volts}
to
balance
the
third
amplifier
stage
for
maximum
gain-
bandwidth
operation.
Beam
Finder
Network
The
Beam
Finder
Network,
consisting
of
transistor
0496
and
associated
components,
provides
a
means
of
locating
a
display
which
overscans
the
graticule
area.
Under
normal
operation,
~—15
volts
is
connected
to
the
base
of
Q496
from
the
BEAM
FINDER
switch
(see
diagram
7)
to
reverse
bias
it.
Therefore,
the
normal
operating
levels
for
U450
are
determined
by
the
resistive
network
connected
to
pins
3,
6,
and
16.
When
the
BEAM
FINDER
switch
is
pressed,
the
—15
volts
is
interrupted
and
the
base
of
0496
rises
positive
to
turn
it
on.
The
resulting
change
in
current
of
U450
unbalances
the
second
amplifier
stage
so
as
to
limit
its
gain.
This
action
compresses
the
display
vertically
within
the
display
area.
HORIZONTAL
AMPLIFIER
The
Horizontal
Amplifier
circuit
amplifies
the
push-pull
horizontal
deflection
signals
from
the
plug-in
unit
in
the
horizontal
compartment
and
connects
it
to
the
horizontal
deflection
plates
of
the
CRT.
Fig.
3-19
shows
a
detailed
block
diagram
of
the
Horizontal
Amplifier
circuit.
A
schematic
of
this
circuit
is
shown
on
diagram
5
at
the
rear
of
this
manual.
Horizontal
Channel
Switch
The
horizontal
signals
from
the
plug-in
unit
in
the
horizontal
compartment
are
connected
to
pin
2
and
pin
15
of
U510.
The
Readout
signal
is
connected
to
pin
7
of
U510.
Integrated
circuit
U510
determines
which
input
signal
will
provide
the
signal
for
the
Horizontal
amplifier
circuit
as
controlled
by
the
X/Y
Shutdown
signal
from
the
Readout
system.
When
the
X/Y
Shutdown
is
LO,
the
signal
from
horizontal
compartment
is
passed
to
the
output
of
U510.
When
the
X/Y
Shutdown
is
high,
the
Readout
signal
is
passed
to
the
output
of
U510.
Resistors
R514,
R515,
R521,
and
R522
establish
the
operating
levels
for this
circuit.
R512
adjusts
the circuit
gain.
R511
and
R513
establish
the
range
for
the
gain
adjustment
(see
Trigger
Channel
Switch
under
TRIGGER
SELECTOR
in
this
section).
For
normal
operation,
the
gain
and
current
level
resistors
are
connected
to
the
Display
Limit
Command
line,
The
3-21
7613

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Tektronix 7613 Specifications

General IconGeneral
BrandTektronix
Model7613
CategoryTest Equipment
LanguageEnglish

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