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7-16
Operating Concepts
Sweep Types
NOTE Earlier 8719, 8720, and 8722 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.
LIST FREQ [STEPPED]
LIST FREQ [STEPPED]
SINGLE SEG SWEEP
ALL SEGS SWEEP
LIST VALUES
EDIT LIST
EDIT
ADD