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F)
THEORY
OF
OPERATION
AND
BASIC
CIRCUITS
BLOCK
DIAGRAM
DESCRIPTION
Refer
to
the
Block
Diagram
(Fig.
3)
for
the
following
explanation.
The
instrument
is
triggered
by
either
an
internal
oscillator
or
an
external
source.
When
triggered
externally,
the
trigger
input
is
fed
into
a
comparator
circuit,
which
has
a
threshold
voltage
set
by
the
LEVEL
control
(for
further
details,
see
the
Threshold
Module
description).
The
output
of
the
comparator
is
a
MTL
pulse.
The
INT/EXT
switch
controls
a
gate
that
selects
either
the
internal
oscillator
or
the
output
of
the
threshold
comparator.
The
output
of
this
gate
leads
to
an
AND
gate.
The
second
input
of
the
AND
gate
is
the
TTL
complement
of
the
GATE
input,
so
that
when
the
GATE
input
is
TTL
low
(OV),
the
AND
gate
passes
the
trigger
pulses
and
inhibits
them
when
the
GATE
input
is
high.
The
two
channels
then
pass
through
the
double-pulse
circuitry.
When
in
the
ADVANCE
or
DELAY
modes,
both
signal
pass
unaltered.
In
the
DOUBLE
PULSE
mode,
the
upper
channel
is
unaltered,
but
the
two
input
channels
are
combined
to
create
a
new
signal
on
the
lower
channel,
yielding
a
series
of
double
pulses.
At
this
stage,
the
user
has
the
option
of
completely
bypassing
the
instrument's
timing
circuitry
by
using
the
back
panel
PW
switch
and
input
connector.
When
the
switch
is
in
the
INT
position,
the
output
of
the
pulse
width
stage
is
connected
to
the
output
stages
of
the
instrument.
In
the
EXT
position,
the
output
stages
can
be
driven
by
TTL
pulses
on
the
back
panel
connector.
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