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Tektronix 067-0587-01 User Manual

Tektronix 067-0587-01
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Circuit
Description
067-0587-01
Pulse
Generator
(cont)
R314
is
normally
adjusted
to
obtain
equal
amplitude
plus
and
minus
output
pulses
(with
each
pulse
set
to
approximately
2.5
div).
A
negative
going
pulse
from
the
Clock
Generator
turns
the
tunnel
diode
off
again
returning
the
transistor
switches
to
their
original
states.
C319
and
C324
are
both
adjusted
to
obtain
a
square
front
corner
on
the
rising
portion
of
the
output
pulse.
Stair
Case
Generator
The
Stair
Case
Generator
consists
of
a
series
of
logic
switched
current
generators,
decoding
logic,
and
a
sequencing
generator.
Sequencing
Generator
The
Sequencing
Generator
is
a
Binary
Coded
decimal decoder
(U185)
driven
by
a
4
bit
counter,
V180.
A
continuous
train
of
pulses
is
supplied
from
the
Clock
Generator
to
the
input
of
U180.
These
pulses
allow
the
counter
to
cycle
through
a
count
of
0
to
15
ata
rate
determined
by
the
REP
RATE
switch
setting.
The
BCD
4
line
output
of
U180
is
connected
to
the
input
of
the
4
line
to
16
line
decoder,
U185.
The
logic
levels
of
the
16
output
lines
are
therefore
sequenced
in
order
from
0
to
15.
Decoding
Logic
Ten
of
the
sixteen
output
lines
are
connected
to
the
decoding
logic
circuitry,
U190A,B
and
U195A,B,C,D.
The
decoding
logic
provides
logic
levels
for
switching
a
pair
of
current
generators
or
several
pairs
of
current
generatofs,
Six
of
the
sixteen
output
lines
are
not
connected
to
provide.
spaces
between
the
positive
going
staircase
and
negative
going
staircase.
Logic
Switched
Current
Generator
There
are
basically
two
types
of
logic
switched
current
generators
used
in
this
instrument.
These
are
the
positive
current
generator
and
negative
current
generator.
An
example
of
a
positive
current
generator
is
CR200,
CR202,
CR204,
R201
and
R203.
By
applying
a
logical
low
to
CR200,
CR202
will
be
forward
biased
and
CR204
will
be
reversed
biased,
therefore
turning
the
current
generator
off.
By
applying
a
logical
high
to
CR200,
CR202
will
be
clamped
off
allowing
current
to
flow
through
CR204.
The
amount
of
current
is
limited
by
precision
resistor
R203.
.

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Tektronix 067-0587-01 Specifications

General IconGeneral
BrandTektronix
Model067-0587-01
CategoryTest Equipment
LanguageEnglish

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