instrumen
t
state.
The
same
TTL
pulse
train
pro
vides
the
pulse
mo
dulation
input
to
the
RF
source
and
to
the
HP
8510
rear
panel
TRIGGER
IN
connector.
Please
note
that
for
in
ternal
triggering,
a
BNC
short
circuit
is
connected
to
the
TRIGGER
IN
connector.
When
the
pulse
generator
is
connected
to
TRIGGER
IN,
mov
e
the
BNC
short
to
the
SWEEP
IN
0
to
10V
connector.
Otherwise,
signals
on
the
sw
eep
in
line
could
aect
triggering.
Figure
3-22.
External
Control
of
PRP
and
Duty
Cycle
Sync
hronization
is
assured
b ecause
time
equals
zero
seconds
for
eac
h
measuremen
t
cycle
is
dened
as
the
rst
falling
edge
of
the
trigger
input
after
stop
sw
eep
is
ready
(high).
Figure
3-22 b
sho
ws
connection
of
an
external
pulse
mo
dulator
instead
of
the
in
ternal
mo
dulator
in
the
RF
source.
Figure
3-23
sho
ws
results
using
this
pulse
mo
dulation
and
triggering
metho d
when
the
pulse
mo
dulation
input
to
the
RF
source
is
a
con
tinuous
train
of
10
microseconds
PRP
,
50
Operation
3-27
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