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Swept List Frequency Sweep (Hz)
:
...
.:..
. . .
.i.;:
/
.i
i
i.
me
:;~~~~.~~~;::~~~~~~
softkey
a&iv&es
a
swept
l&t
frequency
sweep,
one
of
two
fist
./.........
.//
..l..
frequency sweep modes. The swept list mode
allows
the analyzer to sweep a list of arbitrary
frequency points which are defined and modified in a way similar to the stepped list mode.
However, this mode takes data while
swe&ng
through the defined frequency points, increasing
throughput by up to 6 times over a stepped sweep. In addition, this mode allows the test port
power and IF bandwidth to be set independently for each segment that is
delined.
The only
restriction is that you cannot specify overlapping frequency segments.
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. . . .
Sma~=
to
stepped
l&t
mode,
the
'~~~~~~~!:~~~~~
s&key
&o
provides
access
to
the
segment menu. However, swept list mode expands the way segments can be
dehned.
See
below for information
on
how to enter or modify the list segments
Swept Edit List Menu
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;.,;
.,.,.,.,.,.,.,.,.,..
_,
. . .
./,
me
:::~~~:~~~~~~
softkey
within
the
sweep
type
menu
provides
acces
to
the
e&t
Kc&,
menu.
The function of this menu is the same as in the stepped list mode.
Swept Edit
Subsweep
Menu
. . . .
..~~~~~.....:.:...~:.~::
Using the
~~~~~
or
f$E&
softkey within the edit list menu will display the edit
subsweep
menu.
This menu lets you select measurement frequencies arbitrarily. Using this menu it is possible to
define the exact frequencies to be measured on a point-by-point basis at specific power levels
and IF bandwidth settings. The total sweep is defined with a list of subsweeps.
The frequency subsweeps, or segments, can be
delined
in any of the following terms:
n
start/stop/number of
points/power/IFBW
n
start/stop/step/power/IFBW
n
center/span/number of
points/power/IFBW
n
center/span/step/power/IPBW
See “Setting Segment Power” and “Setting Segment IF Bandwidth” for information on how
to set the segment power and IF bandwidth.
The subsweeps may be entered in any particular order but they cannot overlap. The analyzer
sorts the segments automatically and lists them on the display in order of increasing start
frequency, even if they are entered in center/span format. The data is shown on the display as
a single trace that is a composite of
all
data taken. The trace may appear uneven because of
the distribution of the data points, but the frequency
scale
is linear across the
total
range.
Once the list frequencies have been
dellned
or modified, the list frequency sweep mode can be
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p
,~,.“..,.,.,.,.,.,.,....,..
s&x-&d
w&h&
~~~~~~~~~~~.
sofeeyhthe
weep
type
menu.
me
frequency
list
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. . . . . . .
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.
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.
. . .
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parameters can also be saved with an instrument state.
Setting Segment Power
. . .
..~
.::.,.,
;$‘,::::
z<E
~~~~~~:<~‘~.:~~~.~~
:
:
:
:
:,,::~~~~~~~~~~:~~:~~~~~.
.:
m
enable
the
~~~.,:~~,~~~
fM&ion,
you
must
first
s&e&,
~~~~~~~~~~~~~
in
the
edit
>
. . .
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. . . .
/........~...........
. . . . .
..~...............i
. . . . . . . . . . . . ==;;~;;~;;;.;;;;;~;~~~;.i . . . . . . . . . . . . . . . . . .
..L
L;;..G
..v
subsweep
me~~~~~~~~~~~~
off
by
default
and
the
asterisks
that
appear
in
the
“power”
column of the list table indicate that power for the sweep is being set by the normal analyzer
power controls.
Application and Operation
Concepte
6-25