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C)
FRONT
PANEL
CONTROLS
POWER
Switch.
The
POWER
push
button
switch
applies
AC
prime
power
to
the
primaries
of
the
transformer,
turning
the
instrument
on.
The
push
button
lamp
(#382
type)
is
connected
to
the
+15V
DC
supply.
INT/EXT
Switch.
In
the
"INT"
position
the
instrument
is
internally
triggered
and
the
"SYNC
OUT"
connector
provides
a
SYNC
output
which
allows
one
to
trigger
other
instruments,
such
as
oscilloscopes.
In
the
"EXT"
position
the
instrument
is
triggered
by
a +0.5V
to
+40V
50
ns
(or
wider)
input
pulse
on
the
"TRIG
IN"
connector,
or
by
pressing
the
"SINGLE
PULSE"
push
button.
SINGLE
PULSE
Push
Button.
The
"SINGLE
PULSE"
push
button
will
trigger
the
instrument
manually
for
one
cycle
of
output,
when
the
"INT/EXT"
switch
is
in
the
"EXT"
position.
Otherwise,
the
push
button
has
no
effect.
SYNC
OUT.
When
the
"INT/EXT"
switch
is
in
the
"INT"
position,
this
connector
supplies
a
SYNC
output
that
can
be
used
to
trigger
other
equipment,
particularly
oscilloscopes.
This
signal
leads,
or
lags,
the
main
output
by
a duration
set
by
the
"DELAY"
controls
and
has
an
approximate
amplitude
of
+3
Volts
to
R;,>1K
with
a
pulse
width
of
about
50
ns.
TRIG
IN.
When
the
"INT/EXT"
switch
is
in
the
"Ext"
position,
the
external
trigger
(40.5
Volts
to
+40
Volts,
Pw
50
ns)
is
applied
to
this
connector.
This
input
presents
a high
impedance
(1
M Ohm).
TRIGGER
LEVEL.
This
one
turn
control
varies
the
EXT
trigger
level
from
+0.5
Volts
to
+40
Volts.
GATE
Input.
The
GATE
input
will
suppress
the
triggering
of
the
instrument
if
grounded
or
taken
to
a
TTL
LOW
level
(i.e.
0
to
0.8V).
If
it
is
left
open
or
taken
to
a TTL
HIGH
level
(i.e.
+2.4V
to
5.0V),
normal
triggering
will
occur
(Ryy
=
50
Ohm).
REPETITION
RATE
Controls.
The
rotary
switch
marked
"RANGE"
selects
the
pulse
repetition
rate
for
the
internally
triggered
mode.
The
venier
(labeled
"MIN-
MAX")
provides
continuously
variable
control
of
each
range.
There
are
five
ranges
and
the
instrument
is
set
to
the
rate
indicated
on
the
front
panel
when
the
vernier
is
in
the
"MAX"
position.
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