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Tektronix 585 - Page 31

Tektronix 585
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SECTION
4
CIRCUIT
DESCRIPTION
General
This
portion
of
the
Instruction
Manual
presents
a
detailed
discussion
of
the
Type
585
Oscilloscope's
circuit
operation.
This
discussion
is
keyed
to
various
block
diagrams
inserted
with
the
text
and
to
detailed
circuit
diagrams
contained
at
the
back
of
this
manual.
It
is
assumed
a
Type
80
Plug-In
Unit
and
P80
Probe
are
used.
Instrument
Operation
The
simplified
block
diagram
of
Figure
4-1
illustrates
the
interrelation
of
the
various
circuits
composing
the
Type
585
Oscilloscope.
The
input
signal
to
the
oscilloscope
is
con
nected
through
the
probe
to
the
input
connector
of
the
plug-in
unit.
The
output
signal
from
the
plug-in
unit
is
then
applied
to
the
vertical
amplifier
of
the
oscilloscope.
The
output
of
the
vertical
amplifier
system
is
used
to
drive
the
vertical
deflection
plates
of
the
crt.
A
Trigger
Pickoff
circuit
in
the
Vertical
Amplifier
applies
a
sample
of
the
input
waveform
to
the
two
Time-Base
Trig
ger
circuits.
This
waveform
sample
can
then
be
used
to
trigger
a
sweep
by
a
Time-Base
Generator.
In
addition,
an
external
waveform
or
a
line
frequency
waveform
can
be
used
to
trigger
a
sweep.
Signals
of
widely
varying
shapes
and
amplitudes
are
applied
to
the
Time-Base
Trigger
circuits.
The
Trigger
Re
generators
in
turn
produce
constant
amplitude
output
pulses
which
are
used
to
start
a
Time-Base
Generator
at
the
proper
instant
of
time.
This
insures
a
stable
display
of
the
input
waveform.
The
output
pulses
from
two
Trigger
circuits
may
be
ap
plied
to
their
respective
Time-Base
Generators
to
initiate
an
output
sweep
waveform.
The
selected
sawtooth
wave
form
is
then
amplified
by
the
Horizontal
Amplifier
and
ap
plied
to
the
horizontal
deflection
plates
of
the
crt.
When
an
external
sweep
waveform
is
used,
the
wave
form
is
connected
through
the
HORIZ.
INPUT
connector
to
the
External
Horizontal
Amplifier.
The
output
signal
of
the
External
Horizontal
Amplifier
is
then
amplified
by
the
Hori
zontal
Amplifier
and
applied
to
the
crt
horizontal
deflection
plates
to
produce
the
desired
horizontal
deflection.
Sawtooth
waveforms
from
the
two
time
base
generators
are
available
to
be
applied
to
the
delay
pickoff
circuit.
This
circuit
utilizes
one
sawtooth
waveform
at
a
time
to
generate
a
delayed
trigger
pulse
after
an
adjustable
delay
time.
This
delayed
triggering
pulse
is
available
at
the
front
panel
DEL'D
TRIG,
connector.
When
the
sawtooth
waveform
from
the
Time
Base
B
sweep
generator
is
used
to
produce
the
delayed
trigger,
the
delayed
trigger
may
be
used
to
trigger
the
Time
Base
A
Sweep
Generator
circuit.
The
delayed
trigger
is
then
used
to
initiate
a
delayed
sweep
by
Time
Base
A.
The
Amplitude
Calibrator
produces
a
square
wave
output
waveform
which
can
be
used
to
check
the
deflection
factor
of
the
vertical
deflection
system.
The
Amplitude
Calibrator
voltage
is
also
used
to
compensate
attenuator
probes.
There
are
six
regulated
low
voltage
power
supplies
used
in
the
Type
585
Oscilloscope.
These
power
supplies
provide
the
operating
voltages
for
all
circuits
except
the
cathode-ray
tube.
Operating
voltages
for
the
crt
are
provided
by
a
sep
arate
high
voltage
power
supply
contained
in
the
crt
cir
cuit.
In
addition
to
the
high
voltage
power
supply,
the
crt
circuit
contains
the
controls
and
circuitry
which
affect
the
crt
display.
VERTICAL
DEFLECTION
SYSTEM
General
The
Type
585
vertical
deflection
system
can
be
driven
by
any
of
the
80
Series
plug-in
units,
or
by
the
Type
81
Plug-In
Adapter
with
any
Tektronix
letter
series
plug-in
unit.
Input
signals
to
the
oscilloscope
are
applied
directly
to
the
Type
P80
Probe,
when
using
a
Type
80
Plug-In
Unit,
or
either
to
a
probe
or
directly
into
a
1
megohm
input
of
the
Type
82
Dual-Trace
Plug-In
Unit.
The
output
of
a
plug-in
unit
is
then
applied
through
the
interconnecting
plug
to
the
Delay-Line
Driver
stage
of
the
oscilloscope
Vertical
Amplifier.
The
signal
traverses
the
Delay-Line
Driver
stage
and
is
re
turned
to
the
plug-in
for
termination.
The
plug-in
units
pro
vide
positioning
voltages
permitting
the
trace
to
be
posi
tioned
vertically
on
the
crt.
The
input
resistance
and
capacitance
of
each
plug-in
unit
(or
probe)
input
connector
is
discussed
in
the
manual
for
the
unit
in
use.
In
all
cases,
consider
the
oscilloscope
input
as
a
potential
load
on
the
signal
source,
the
degree
depend
ing
upon
the
signal
source
impedance,
the
plug-in
input
characteristics,
and
the
frequency
being
measured.
Delay-Line
Driver
The
Delay-Line
Driver
Stage
is
a
balanced
distributed
amplifier
consisting
of
seven
push-pull
triode
sections.
Use
4-1

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