4. Operating Instructions
3. If using the Special Main menu, press the MENU button then Distance to Fault. If using the
Standard Main menu, press the AUTOFIT/HELP button, then select the AUTOFIT menu
item. The CT100B will display a trace that includes the beginning and the end of the test
cable. The cursors will be moved to an area approximate to the cable ends. Figure 4.5 shows
an AUTOFIT result. The cable end, in this case an open termination, has been found at
3.023 feet and the whole cable trace is displayed on the screen.
Figure 4.5. Screenshot showing AUTOFIT result.
4. Accurately position the cursors to bracket the area of the trace associated with the test cable.
Using the scale and position knobs, move the ending cursor so that it is just aligned with the
“toe” of the open or shorted fault at the end of the cable (Figure 4.6). If an adapter is used,
position the starting cursor at the end of the adapter. The accuracy of cursor placement
affects the accuracy of the Vp measurement.
CT100B TDR Cable Analyzers Operator’s Manual 43
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