Time And Distance Information - Anritsu MS2024B Manual

Time Domain, Option 2

8-6 Time and Distance Information

8-6 Time and Distance Information
To help you with the time and distance setup, the VNA Master provides a helpful aid that
provides information on the resolution and maximum range.
Figure 8-14 shows the Distance Info window (which can be displayed from the Additional Dist
Setup submenu under the Distance Setup menu). This window provides information to help
you with the distance domain setup. The top portion of the window displays information
about the selected Cable or Waveguide. If you select a cable from the cable list (or a
waveguide from the waveguide list), then the name of the cable and its associated parameters
are displayed under the heading CABLE INFO (or WAVEGUIDE INFO). Below that heading
is the CURRENT INFO section, which summarizes the actual parameters being used in the
measurements. For cables, the parameters are propagation velocity and cable loss. For
waveguide, they are cut-off frequency and waveguide loss. These current parameters are
either the values that are associated with the chosen cable or waveguide from the list, or they
are the values that are entered directly by the user.
The bottom part of the list provides information about the settings and suggestions for
meeting the maximum required distance. This section is divided into three columns,
headed: PARAMETER, ROUND TRIP, and ONE WAY for one-way measurements. They key
parameters that are displayed are the Distance Resolution and the Distance Max. The
following list includes all of the items in the Distance Info window with a brief description of
each item:
Fstart: the start frequency
Fstop: the stop frequency
Distance Resolution: the calculated distance resolution based on the frequency range
No. of Data Points: number of points in the sweep
Distance Max: maximum usable distance based on frequency span and number of points
Dstart: the start distance
Dstop: the stop distance (when set greater than Dmax, the following suggestions can be used
to increase Dmax to make it equal to Dstop)
Suggestion 1: Adjust Freq span to meet Dstop
Max Span: suggested frequency span (within allowable range) to make Dmax = Dstop
Suggested Start Freq: typically equal to the Fstart that was set by user
Suggested Stop Freq: suggested stop frequency based on calculated Max Span and Fstart
Resulting Distance Resolution: resulting resolution if new Fstart and Fstop are used
Maximum Usable Range (Dmax): resulting Dmax if new Fstart and Fstop are used
Suggestion 2: Adjust No. of pts to meet Dstop (using current Fstart and Fstop)
Min Number of points to get Dstop: suggested number of points to make Dmax = Dstop
Maximum Usable Range (Dmax): resulting Dmax if the new number of points are used
Vector Network Analyzer MG PN: 10580-00289 Rev. K 8-17