HP 8753D - Page 289

Logarithmic
Frequency
Sweep
(Hz)
The
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LOG
FREQ softkey
activates a
logarithmic frequency
sweep mode
.
The
source
is
stepped
in
logarithmic
increments
and
the
data is
displayed on
a logarithmic
graticule.
This is
slower
than
a
continuous
sweep
with
the same
number of
points,
and the
entered sweep
time may
therefore
be
changed
automatically
.
For
frequency spans
of less
than two
octaves,
the sweep
type
automatically
reverts
to linear
sweep.
List
Frequency
Sweep
(Hz)
The
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LIST
FREQ
softkey provides
a user-denable
arbitrary frequency
list
mode
.
This
list
is
dened
and
modied
using
the
edit
list
menu
and
the
edit
subsweep
menu.
Up
to 30
frequency
subsweeps
(called
\segments")
of
several
dierent
types
can
be
specied,
for a
maximum total
of
1632
points
.
One
list
is
common
to
both
channels.
Once a
frequency list
has been
dened
and
a
measurement
calibration
performed
on
the
full
frequency
list,
one or
all of
the frequency
segments
can
be
measured
and
displayed
without
loss
of
calibration.
When
the
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LIST
FREQ
key
is
pressed,
the
network
analyzer
sorts
all
the
dened frequency
segments
into
CW
points
in
order
of
increasing
frequency
.
It
then
measures
each
point
and
displays
a
single
trace
that
is
a
composite
of
all
data
taken.
If duplicate
frequencies exist,
the
analyzer
makes
multiple
measurements
on identical
points to
maintain the
specied number
of
points
for
each
subsweep
. Since
the frequency
points may
not be
distributed
evenly
across
the
display
,
the
display
resolution
may be
uneven, and
more
compressed
in
some
parts
of
the
trace
than
in
others
.
However
, the
stimulus and
response
readings
of
the
markers
are
always
accurate
.
Because
the
list
frequency
sweep
is
a stepped
CW
sweep
,
the
sweep
time
is
slower
than for
a
continuous
sweep
with
the
same
number
of
points
.
Segment
Menu
The
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LIST
FREQ
softkey
provides
access
to
the
segment
menu, which
allows
you
to
select
any
single
segment (
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SINGLE
SEG
SWEEP )
in the
frequency
list
or
all
of
the
segments
(
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ALL
SEGS
SWEEP
)
in
the
frequency
list.
Refer
to
\Modifying
List
Frequencies"
in
this
section
for
information
on how
to enter
or modify
the
list
frequencies
.
If
no
list
has
been
entered,
the
message
CAUTION: LIST
TABLE EMPTY
is
displayed.
A
tabular
printout
of
the
frequency
list
data
can
be
obtained
using
the
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LIST
VALUES
function
in
the
copy
menu.
6-22 Application and Operation Concepts