4. Operating Instructions
Figure 4.12. Relative distance measurement between two small impedance “faults” caused
by BNC connectors.
In general, for the most accurate relative distance or time measurements between two faults, place
the cursors on the “toe” region of the faults where the TDR trace is just beginning to rise above or
fall below the cable characteristic impedance.
4.7.2.1. Zero Offset
Normally, the horizontal zero point of a trace is the cable connector on the front of the CT100B. If
a zero point needs to be set that excludes a test harness or adapter cable, the Set Zero Offset
Position function can help.
1. Using the HORIZONTAL POSITION knob, position the cursor at the end of the adapter
cable or test harness.
2. Press the MENU button, and go to Settings → Display → Set/Clear Zero Offset
(Figure 4.13).
3. The Zero Offset menu appears. Note that measurement for the cursor position has not
changed yet (Figure 4.14).
4. Press Set New Position. The CT100B will “move” the zero position to where the cursor is
located on-screen. The background between the real zero point and the offset will be
highlighted in orange. See Figure 4.15.
CT100B TDR Cable Analyzers Operator’s Manual 49
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