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 Vector Network Analyzers Using CMT VNA Software

The segment table determines the sweep parameters when segment sweep type is used (See Sweep Type).

The channel to which the function is applied must be preselected as active (See Selection of Active Trace/Channel).

edit segments

To open the segment table, use the following softkeys:

Channel > Sweep Mode > Segment

Edit Segments

When editing the segments, the segment table will open in the lower part of the application. To hide the segment table, either click Edit Segments again or click Hide Segments.

The segment table layout is shown below (See figure below). The table has three mandatory columns: start frequency, stop frequency, and number of points, and three columns which can be optionally enabled/disabled: IF bandwidth, power level, and delay time.

Segment Table

Segment Table Example

Each row describes one segment. The table can contain one or more rows. The number of segments is limited only by the instrument’s maximum number of points.

add segment

delete segment

To add a segment to the table, click the Add softkey. The new segment row will be entered below the highlighted one.

To delete a segment, click the Delete softkey. The highlighted segment will be deleted.

For any segment it is necessary to set the mandatory parameters: frequency range (start and stop) and number of points. The frequency range can be set either as Start / Stop, or as Center / Span.

 

To set the frequency range representation mode, use the Range dropdown to select between the Start/Stop and Center/Span options.

For any segment, the following additional parameter columns can be enabled: IF bandwidth, power level, and delay time. If such a column is disabled, the corresponding value set for linear sweep will be used (same for all the segments).

parameters in segment table

To enable the IF bandwidth column, toggle IFBW on.

To enable the power level column, toggle Power on.

To enable the delay time column, toggle Delay on.

 

 

 

To set a parameter, click on its value field and enter the value. To navigate in the table, use the keys on the keyboard.


note

Adjacent segments must not overlap in the frequency domain.


The segment table can be saved into *.SEG file to a hard disk and later recalled.

save table

To save the segment table, click the Save softkey.

Then enter the file name in the appeared dialog.

load table

To recall the segment table, click Load softkey.

Then select the file name in the appeared dialog.

 

 

 

Rev.:  25.00