HP 8753D - Page 399

Figure
6-72.
Response
Resolution
While
increasing
the
frequency
span
increases
the
response
resolution,
keep
the
following
points
in
mind:
The
time
domain
response
noise
oor
is
directly
related
to
the
frequency
domain
data
noise
oor
.
Because
of
this
,
if
the
frequency
domain
data
points
are
taken
at
or
below the
measurement
noise
oor
,
the
time
domain
measurement
noise
oor is
degraded.
The
time
domain
measurement
is
an
average
of
the
response over
the frequency
range
of
the
measurement.
If
the
frequency
domain
data
is
measured
out-of-band,
the
time domain
measurement
is
also
the
out-of-band
response
.
Y
ou
may
(with
these
limitations in
mind)
choose
to
use
a
frequency
span
that
is
wider
than
the
test
device
bandwidth
to
achieve
better resolution.
Range
resolution.
Time
domain
range
resolution is
dened as
the
ability
to
locate
a
single
response
in
time
.
If
only one
response is
present,
range
resolution
is
a
measure
of
how
closely
you
can
pinpoint
the
peak
of that
response.
The
range
resolution
is
equal
to
the
digital
resolution
of the
display
,
which
is
the
time
domain
span
divided
by
the
number
of
points
on
the
display
.T
o
get
the
maximum
range
resolution,
center
the
response
on
the
display
and
reduce
the
time domain
span.
The
range
resolution
is
always
much
ner
than
the
response
resolution
(see
Figure 6-73
).
Figure 6-73. Range Resolution of a Single Discontinuity
6-132 Application and Operation Concepts