Datapulse 101 - Page 17

f3
_.
..
.—
i‘L‘L—Lftfigliii
continue
until
the
gate
is
removed.
The
reference
trigger
output
is
gated
in
both
modes
of
operation.
Both
the
leading
and
trailing
edges
of
the
delay
multivibrator
output
waveform
are
differentiated
to
produce
trigger
pulses
separated
in
time
by
the
delay
period.
These
are
applied
to
the
reference
trigger
amplifier
and
to
the
width
multivibrator
through
the
OR
gate.
Switch
S71
disconnects
the
leading
pulse
from
the
input
to
the
width
multivibrator
(l
E)
in
the
single
pulse
mode
so
that
the
main
output
is
a.
single
pulse
separated
in
time
from
the
reference
trigger
output
by
the
delay
period.
In
the
double
pulse
mode,
the
width
multivibrator
is
turned
on
twice
during
each
cycle
by
the
two
trigger
pulses.
The
first
pulse
occurs
approx-
imately
30
nanoseconds
after
the
reference
trigger
output
and
the
second
at
a
point
determined
by
the
pulse
delay
controls.
Both
pulses
are
essentially
identical.
The
pulse
width
in
either
mode
is
determined
by
the
period
of
the
width
multivibrator.
The output of the width multivibrator (2 A) is us ed by the output
drivers
to
generate
a
signal
(2
C)
to
drive
the
positive
output
amplifier.
An
inverted
version
(2
B)
generates
the
signal
(2
D)
used
to
drive
the
negative
output amplifier.
Variable attenuators provide output pulse amplitude control. The
overload protection circuits are current sensitive and turn off their
respective power supplies when either output is overloaded.