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Operating Concepts
Sweep Types
NOTE Earlier 8753 models allowed a maximum of 1632 points, but this value was reduced to 1601
to add the 4 channels in the 4-parameter display feature.
One list is common to both channels. Once a frequency list has been defined 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 key is pressed, the network analyzer sorts all the defined
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 specified 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 softkey provides access to the segment menu, which allows you to
select any single segment ( ) in the frequency list or all of the segments
( ) in the frequency list.
See the following 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
function in the copy menu.
Stepped Edit List Menu
The softkey within the sweep type menu provides access to the edit list menu.
This menu is used to edit the list of frequency segments (subsweeps) defined with the edit subsweep menu,
described next. Up to 30 frequency subsweeps can be specified, for a maximum of 1601 points. The
segments do not have to be entered in any particular order: the analyzer automatically sorts them and shows
them on the display in increasing order of start frequency. This menu determines which entry on the list is to
be modified, while the edit subsweep menu is used to make changes in the frequency or number of points of
the selected entry.
Stepped Edit Subsweep Menu
Using the or 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. For example, the sweep could include 100 points in a
narrow passband, 100 points across a broad stop band, and 50 points across the third harmonic response.
The total sweep is defined with a list of subsweeps.
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