Figure
3-11.
Pulsed-RF
S-P
arameters
v
ersus
Frequency
(Frequency
Domain
P
oint-in-Pulse)
2.
Pulse
Prole
Domain.
A
rep etitiv e
sampling
tec
hnique
is
used
to
make
measuremen
ts
in
the
pulse
prole
domain.
Measuremen
ts
are
taken
at
a
single
frequency
as
determined
b
y
the
start
frequency
setting.
Data
is
reconstructed
from
samples
taken
from
a
series
of
pulses.
F
or
eac
h
pulse,
a
single
p oint
in
the
pulse
is
measured.
A
prole
of
the
pulse
is
made
b
y
measuring
the
rst
pulse
at
the
user-sp ecied
Start
time,
then
increasing
the
measuremen
t
trigger
dela
y
b
y
a
certain
time
incremen
t
for
eac
h
pulse
un
til
the
sp ecied
n
um
b er
of
p oints
is
measured.
Refer
to
Figure
3-12
for
an
example
of
this
pro cess.
Time
zero
is
the
leading
edge
of
the
in
ternally-generated
pulse
output
w
a
v
eform,
or
the
falling
edge
of
the
externally-generated
measuremen
t
trigger
w
a
v
eform.
The
net
w
ork
analyzer
automatically
con
trols
the
time
incremen
t
b et
w
een
samples,
called
the
measuremen
t
resolution
p erio
d,
using
an
algorithm
that
dep ends
up on
the
greater
of
the
user-sp ecied
pulse
width
or
stop
time.
This
automatic
selection
of
the
time
resolution
can
b e
seen
b
y
c
hanging
the
n
um
b er
of
p oints
and
th
time
span.
F
or
narrow
pulses
and
small
time
spans,
the
measuremen
t
resolution
p erio
d
can
b e
as
small
as
100
nanoseconds;
for
wide
pulses
and
large
time
spans,
it
can
increase
to
m
ultiples
of
10
microseconds.
With
the
in
ternal
measuremen
t
trigger,
the
rst
sample
can
b e
taken
up
to
6
resolution
p erio
ds
prior
to
time
zero.
When
using
Operation
3-13
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