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Tektronix 067-0587-01 User Manual

Tektronix 067-0587-01
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Circuit
Description
067-0587-01
Logic
Switched
Current
Generator
(cont)
An
example
of
a
negative
current
generator
is
U200E,
CR266,
CR268,
CR270
and
R296.
A
logical
low
applied
to
U200E
causes
CR266
and
CR268
to
turn
on
foreing
CR270
off
which
effectively
turns
the
current
generator
off.
A
logical
high
into
U200E
causes
the
cathode
of
CR266
to
drop
thus
clamping
CR268
off
which
in
turn
allows
current
to
flow
through
CR270.
With
the
TEST
switch
in
the
GAIN
position,
the
current
generators
are
connected
to
the
oscilloscope's
trigger
or
signal
input.
These
inputs
have
an
input
resistance
of
50
ohms
to
ground,
therefore,
the
voltage
produced
across
the
50
ohm
resistor
is
directly
related
to
the
current
through
it.
CW
Leveled
The
single
ended
signal
applied
to
the
AUX
IN,
CW IN
connector
is
connected
to
a
high
frequency
push-pull
amplifier
U30..
Minimum
gain
is
set
by
R31.
R31
is
set
so
that
a
10
division
input
signal
will
produce
approximately
a
2
division
display
when
the
AMPLITUDE
control
is
fully
counterclockwise.
The
signal
from
U30
is
connected
through
T60
to
the
differential
amplifier
Q64 and
Q74.
The
output
of
this
amplifier
is
connected
to
the
TEST
switch
to
await
mode
selection.
The
relative
DC
level
(position)
of
this
signal
is
controlled
by
the
voltage
dividers
formed
by
R335A,
and
R335B.
In
the
FREQ RESP
mode
the
gain
of
U30
is
controlled
by
the
automatic
leveling
circuit.
CR80,
C81,
CR84
and C83
form
a
peak
to
peak
detector
giving
a
DC
representation
of
the
output
signal
amplitude.
The
output
of
the
peak
to
peak
detector
is
connected
to
a
comparator
amplifier,
U94,
through
the
balanced
to
single
ended
converter,
U90.
A
DC
level
corresponding
to
the
desired
signal output
is
set
at
the
input
of
the
comparator
amplifier
by
the
Amplitude
Control,
R330B.
The
resultant
output
of
the
comparator
amplifier
is
connected
to
U30
to
control
the
gain.
This
output
is
also
connected
to
the
leveling
light
circuit
Q98
and
Q102.
R25
provides
DC
balance
and
is
adjusted
for
minimum
trace
shift
while
varying
the
input
signal
from
approximately
0.3
volts
peak
to
peak
to
approximately
0.7
volts
peak
to
peak
(CW
LEVELED
light
should
be
lit).
Trigger
Piekoff
Triggering
for
the
mainframe
is
provided
by
the
differential
amplifier,
Q42
and
Q52.
The
relative
DC
level
position
of
the
trigger
signal
is
controlled
by
the
voltage
dividers
R335A
and
R335B.
3-3

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Tektronix 067-0587-01 Specifications

General IconGeneral
BrandTektronix
Model067-0587-01
CategoryTest Equipment
LanguageEnglish

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