Figure
3-16.
S
21
,
Pulse
Profile,
Thru
1.
Set
Pulse
P
olarit
y
.
After
instrumen
t
preset,
the
pulse
p olarity
is
set
to
High
for
the
On
p erio
d
of
the
pulse
app earing
at
the
HP
8510
rear
panel
PULSE
OUTPUT
connector.
Use
the
following
pro cedure
to
set
the
pulse
p olarity
.
Press
4
SYSTEM
5
NNNNNNNNNNNNNN
MORE
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
PULSE
CONFIG
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
PULSE
OUT:
HIGH
.
F
or
in
ternal
pulse
mo
dulation
and
in
ternal
triggering,
time
equals
zero
seconds
is
alwa
ys
the
p oint
where
the
pulse
transitions
to
the
active
lev
el.
The
in
ternal
pulse
mo
dulator
in
the
RF
source
turns
the
RF
pulse
On
when
the
analyzer
output
is
p ositiv e,
so
the
noisy
part
of
the
trace
will
c
hange
lo
cation
dep ending
on
the
pulse
p olarit
y
.
2.
Set
Pulse
Width.
After
instrumen
t
preset,
the
pulse
width
is
set
to
10
microseconds.
Press
the
following
k
eys
to
set
a
dieren
t
pulse
width.
Press
4
SYSTEM
5
NNNNNNNNNNNNNN
MORE
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
PULSE
CONFIG
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
PULSE
WIDTH
.
Use
the
knob,
step
k
eys,
or
n
umeric
en
try
to
set
the
desired
pulse
width.
3.
Set
Dut
y
Cycle
Limit.
After
instrumen
t
preset,
the
dut
y
cycle
limit
is
set
to
10.
This
means
that
the
maximum
dut
y
cycle
will
nev
er
b e
allo
w
ed
to
b e
greater
than
10
p ercen
t
regardless
of
the
pulse
width.
T
o
set
the
dut
y
cycle
limit,
press
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
DUTY
CYCLE
on
the
Pulse
Conguration
men
u.
Use
the
knob,
step
k
eys,
or
n
umeric
en
try
to
set
the
desired
maximum
dut
y
cycle
limit.
Note
that
the
actual
dut
y
cycle
may
b e
less.
4.
Set
Measuremen
t
Time
Span.
The
HP
8510
automatically
c
ho oses
the
minimum
p ossible
(given
the
HP
8510
hardw
are
and
rm
w
are
capabilities)
time
b et
w
een
samples,
and
th
us
the
measuremen
t
resolution
p erio
d,
dep ending
up on
the
larger
of
the
pulse
width
time
or
the
stop
time.
This
results
in
a
minimum
p ossible
span
time
whic
h
dep ends
up on
the
curren
t
n
um
b er
of
p oints.
3-20
Operation
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