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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.
The
output
stages
are
all-solid-state,
MOSFET
totem
pole
circuits.
There
is
a positive
output
and
a negative
output
stage
and
the
polarity
switch
selects
one
of
the
two
outputs.
The
pulse
width
of
the
output
pulse
is
equal
to
the
pulse
width
of
the
input
pulse
and
the
amplitude
of
the
output
pulse
is
controlled
by
a
combination
of
the
DC
voltage
applied
to
the
circuit
and
T-attenuators
selected
by
the
Amplitude
Range
switch.
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