7-18
Operating Concepts
Sweep Types
The frequency subsweeps, or segments, can be defined in any of the following terms:
• start/stop/number of points/power/IFBW
• start/stop/step/power/IFBW
• center/span/number of points/power/IFBW
• center/span/step/power/IFBW
See “Setting Segment Power” and “Setting Segment IF Bandwidth” on page 7-19 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 defined or modified, the list frequency sweep mode can
be selected with the softkey in the sweep type menu. The frequency
list parameters can also be saved with an instrument state.
Setting Segment Power
To enable the function, you must first select
in the edit subsweep menu. List power is 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.
The power settings for all segments are restricted to a single power range. This prevents
the attenuator from switching to different settings mid-sweep. Select the power range and
then edit the list table to specify the segment powers. If the power range is selected after
the list has been defined, the list settings may be affected.
When analyzer port power is uncoupled, the segment power level can be set independently
for each port. To do this, you must first select a measurement parameter to activate the
port whose power you want to set. For example, select S11 to set port 1 power, or S22 to set
port 2 power. (Notice that the list mode table will only display the currently selected port in
the table. This is due to restricted display space.)
When analyzer port power is uncoupled, the softkey can also be set
independently for each port. For example, you may choose to set for
forward measurements and for reverse measurements. In this
case, the power would be set according to values in the list when measuring the forward
parameters. When measuring the reverse parameters, the power would be set according to
the normal analyzer power controls.
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