Fault Location Software
A captured RL or SWR trace can be transformed to a Distance to Fault
display. This is useful for determining the location of faults, connec-
tions, and other discontinuities within the cable.
To transform a plot, select Fault Find from the Tools menu (or click
the toolbar button). A drop down menu will appear that asks you if the
DUT is coaxial cable or waveguide. If coaxial cable, it asks you to sup-
ply start and stop distances along with propagation velocity and inser-
tion loss values. If waveguide, it asks you to supply start and stop
distances along with cutoff frequency and insertion loss values. Tables
in Appendix A provide these values for some of the more popular coax-
ial cables and waveguides. If values are needed at a different frequency,
or if you need the exact values for more accurate measurement, please
contact the coaxial cable or waveguide manufacturer. Coaxial cables
may be added to the list be editing the cables.lst file; waveguides
may be added to the list by editing the wvguides.lst file. Follow
the existing format to enter the data to the list. The distance may be en-
tered in feet or meters. Propagation velocity or dielectric constant may
be used for coaxial cable. The units may be changed by selecting De-
fault Plot Settings under the Settings menu and changing “Distance
Units.”
After supplying the needed information and clicking OK, a new plot
will open showing coax/waveguide match vs. distance.
Smith Chart Software
After obtaining a frequency SWR or RL plot on the computer display,
click the Smith Chart icon. Read the Help file to see how this feature
functions (under Smith Chart and Data Readout).
3-10
Chapter 3 Screen Capture Program
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