4. Operating Instructions
Figure 4.9. AUTOFIT cable. The cable termination is a short.
4. Note the “bump” in the middle of the cable in Figure 4.9. This is where two short test cables
are connected with a BNC barrel connector. Position the active cursor on the reflection
caused by this cable fault. Adjusting the vertical scale helps make cable faults more obvious,
as in Figure 4.10, which is at the same horizontal scale as Figure 4.9 but zoomed-in vertically.
By positioning the inactive cursor just before the connector, we can see the delta value of
~4.4 Ω impedance change in the connector vs. the impedance of the cable.
Figure 4.10. Vertical scale used to emphasize cable fault.
5. Use the HORIZONTAL SCALE and VERTICAL SCALE knobs to further zoom in on the
fault to get a more accurate measurement of Distance-to-Fault (DTF). Position the cursor at
the “toe” or early rising edge of the fault. The distance measurement shown on the screen for
the active cursor is then the Distance-to-Fault. See Figure 4.11.
CT100B TDR Cable Analyzers Operator’s Manual 47
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