HP 8753D - Page 117

Measuring a
Device in
the Time
Domain (Option
010 Only)
The
HP
8753D
Option
010 allows
you to
measure the
time domain
response of
a device
. Time
domain
analysis
is
useful
for
isolating
a device
problem in
time or
in distance
. Time
and
distance
are
related
by
the
velocity
factor of
your device
under test.
The analyzer
measures
the
frequency
response
of
your
device
and uses
an inverse
Fourier
transform to
convert the
data
to
the
time
domain.
Gating
Time
domain
analysis
allows
you
to
mathematically remove
individual parts
of the
time
domain
response
to
see
the
eect
of
potential design
changes.
You
can
accomplish
this
by
\gating"
out
the
undesirable
responses
.
This
section
shows you
how to
use the
time domain
function
to
measure
a
device
response
by
the
following
measurement examples:
transmission
measurement
of RF
crosstalk and
multi-path signal
through a
surface
acoustic
wave
(SA
W) lter
reection
measurement
that
locates
reections
along
a terminated
transmission
line
Transmission
Response
in
Time
Domain
In
this
example
measurement
there
are
three
components
of
the
transmission
response:
RF
leakage
at
near
zero
time
the
main
travel
path
through
the
device
(1.6

s
travel
time)
the
\triple
travel"
path
(4.8

s
travel
time)
This
example
procedure
also
shows
you
how
time
domain
analysis
allows
you
to
mathematically
remove
individual
parts
of
the
time
domain
response
to
see
the
eect
of
potential
design
changes
.
This
is
accomplished
by
\gating"
out
the
undesirable
responses
.
With
the
\gating"
capability
,
the
analyzer
time
domain
allows
you
perform
\what
if"
analysis
by
mathematically
removing
selected
reections
and
seeing
the
eect
in the
frequency domain.
1.
Connect
the
device
as
shown in
Figure 2-49
.
Figure 2-49. Device Connections for Time Domain Transmission Example Measurement
2-68 Making Measurements