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Tektronix 067-0587-01 User Manual

Tektronix 067-0587-01
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SECTION
3
067-0587-01
CIRCUIT
DESCRIPTION
Clock
Generator
The
clock
generator
consists
of
an
astable
multivibrator,
two
buffers
and
switchable
timing
capacitors.
The
frequency
of
the
multivibrator,
Q134
and
Q140,
is
selected
by
switching
one
of
five
emitter
coupled
timing
capacitors
into
the
circuit.
This
is
done
by
the
REP
RATE
switch,
S150.
External
TRIG
OUT
is
coupled
directly
from
the
multivibrator
to
the
front
panel
connector.
Buffer
Q118
provides
a
clock
signal
to
the
Trigger
Amplifier
and
Staircase
Generator
The
output
of
buffer
Q122
passes
thru
a
differentiating
circuit
consisting
of
R124
and
C125.
The
output
of
the
differentiator
is
used
as
a
trigger
for
the
Pulse
Generator.
Trigger
Amplifier
The
Trigger
Amplifier
provides
the
oscilloscope
mainframe
with
a
triggering
signal
which
in
turn
is
uded
in
the
horizontal
time
base
amplifier.
The
circuit
consists
of
the
Clock
Generator
signal
and
‘two
transistor
switches,
Q164
and
Q170.
A
positive
transition
at
the
base
of
Q164
causes
a
negative
transition
at
the
collector
of
Q164
and
a
positive
transition
at
the
collector
of
Q170.
The
switching
level
of
Q170
and
Q164
is
controlled
by
R176.
R176,
therefore,
is
effectively
a
delaying
control
which
is
used
to
match
the
trigger
output
signal
with
the
fast
rise
pulse
from
the
Pulse
Generator.
Fulse
Generator
The
pulse
generator
consists
of
a
number
of
current
switches
that
are
controlled
by
the
tunnel
diode
CR280.
A
positive
pulse
from
the
Clock
Generator
causes
CR280
to
turn
on.
This
causes
Q282
to
turn
on
shutting
Q292
off.
This
turns
the
complementary
transistor
switches
Q296
and
Q298
on
which
reverse
biases
the
diconnect
diodes
CR300,
CR301,
CR395
and
CR306.
The
complementary
transistor
switches
Q310
and
Q312,turn
off the
diconnect
diodes
CR318,
CR320,
CR323,
and
CR325
therefore,
removing
the
minus
voltage
from
R326
and
the
positive
voltage
from
R321.
The
amplitude
of
this
voltage
is
set
by
the
AMPLITUDE
control.
R314
is
a
balance
control
used
mainly
to
correct
for
tracking
errors
in
the
AMPLITUDE
control.

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Tektronix 067-0587-01 Specifications

General IconGeneral
BrandTektronix
Model067-0587-01
CategoryTest Equipment
LanguageEnglish

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